[1] | 1 | /* |
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| 2 | * process.h - process related management functions |
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[173] | 3 | * |
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[1] | 4 | * Authors Ghassan Almaless (2008,2009,2010,2011,2012) |
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| 5 | * Mohamed Lamine Karaoui (2015) |
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[433] | 6 | * Alain Greiner (2016,2017,2018) |
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[1] | 7 | * |
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| 8 | * Copyright (c) UPMC Sorbonne Universites |
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| 9 | * |
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| 10 | * This file is part of ALMOS-MKH. |
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| 11 | * |
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| 12 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 13 | * under the terms of the GNU General Public License as published by |
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| 14 | * the Free Software Foundation; version 2.0 of the License. |
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| 15 | * |
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| 16 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 19 | * General Public License for more details. |
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| 20 | * |
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| 21 | * You should have received a copy of the GNU General Public License |
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| 22 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 23 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 24 | */ |
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| 25 | |
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| 26 | #ifndef _PROCESS_H_ |
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| 27 | #define _PROCESS_H_ |
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| 28 | |
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[14] | 29 | #include <kernel_config.h> |
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[1] | 30 | #include <errno.h> |
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| 31 | #include <hal_types.h> |
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| 32 | #include <list.h> |
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| 33 | #include <xlist.h> |
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| 34 | #include <bits.h> |
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| 35 | #include <spinlock.h> |
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| 36 | #include <hal_atomic.h> |
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| 37 | #include <vmm.h> |
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| 38 | #include <cluster.h> |
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| 39 | #include <vfs.h> |
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| 40 | |
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| 41 | /**** Forward declarations ****/ |
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| 42 | |
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| 43 | struct thread_s; |
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| 44 | |
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| 45 | /********************************************************************************************* |
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| 46 | * These macros are used to compose or decompose global process identifier (PID) |
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| 47 | * to or from cluster identifier / local process index (CXY , LPID) |
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| 48 | ********************************************************************************************/ |
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| 49 | |
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| 50 | #define LPID_FROM_PID( pid ) (lpid_t)(pid & 0x0000FFFF) |
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| 51 | #define CXY_FROM_PID( pid ) (cxy_t)(pid >> 16) |
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| 52 | #define PID( cxy , lpid ) (pid_t)((cxy << 16) | lpid ) |
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| 53 | |
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| 54 | /********************************************************************************************* |
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[428] | 55 | * This enum defines the actions that can be executed by the process_sigaction() function. |
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[409] | 56 | ********************************************************************************************/ |
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| 57 | |
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| 58 | enum process_sigactions |
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| 59 | { |
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[436] | 60 | BLOCK_ALL_THREADS = 0x11, |
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| 61 | UNBLOCK_ALL_THREADS = 0x22, |
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| 62 | DELETE_ALL_THREADS = 0x33, |
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[409] | 63 | }; |
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| 64 | |
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| 65 | /********************************************************************************************* |
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[1] | 66 | * This structure defines an array of extended pointers on the open file descriptors |
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| 67 | * for a given process. We use an extended pointer because the open file descriptor |
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| 68 | * is always stored in the same cluster as the inode associated to the file. |
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| 69 | * A free entry in this array contains the XPTR_NULL value. |
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| 70 | * The array size is defined by a the CONFIG_PROCESS_FILE_MAX_NR parameter. |
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[23] | 71 | * All modifications (open/close) in this structure must be done by the reference cluster, |
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| 72 | * and reported in process copies. |
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[1] | 73 | ********************************************************************************************/ |
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| 74 | |
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| 75 | typedef struct fd_array_s |
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| 76 | { |
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[101] | 77 | remote_spinlock_t lock; /*! lock protecting fd_array */ |
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| 78 | uint32_t current; /*! current number of open files */ |
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| 79 | xptr_t array[CONFIG_PROCESS_FILE_MAX_NR]; /*! xptr on open file descriptors */ |
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[1] | 80 | } |
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| 81 | fd_array_t; |
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| 82 | |
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| 83 | /********************************************************************************************* |
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| 84 | * This structure defines a process descriptor. |
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| 85 | * A process is identified by a unique PID (process identifier): |
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| 86 | * - The PID 16 LSB bits contain the LPID (Local Process Index) |
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| 87 | * - The PID 16 MSB bits contain the owner cluster CXY. |
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[409] | 88 | * In each cluster, the process manager allocates the LPID values for the process that |
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| 89 | * are owned by this cluster. |
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| 90 | * The process descriptor is replicated in all clusters containing at least one thread |
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| 91 | * of the PID process, with the following rules : |
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[23] | 92 | * 1) The <pid>, <ppid>, <ref_xp>, <vfs_root_xp>, <vfs_bin_xp> fields are defined |
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| 93 | * in all process descriptor copies. |
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| 94 | * 2) The <vfs_cwd_xp> and associated <cwd_lock>, that can be dynamically modified, |
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| 95 | * are only defined in the reference process descriptor. |
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[409] | 96 | * 2) The <vmm>, containing the VSL (list of registered vsegs), and the GPT (generic |
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| 97 | * page table), are only complete in the reference process cluster, other copies |
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| 98 | * are actually use as read-only caches. |
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[23] | 99 | * 3) the <fd_array>, containing extended pointers on the open file descriptors, is only |
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| 100 | * complete in the reference process cluster, other copies are read-only caches. |
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[173] | 101 | * 4) The <sem_root>, <mutex_root>, <barrier_root>, <condvar_root>, and the associated |
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[23] | 102 | * <sync_lock>, that are dynamically allocated, are only defined in the reference cluster. |
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[428] | 103 | * 5) The <children_root>, <children_nr>, <brothers_list>, and <txt_list> fields are only |
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| 104 | * defined in the reference cluster, and are undefined in other clusters. |
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| 105 | * 6) The <local_list>, <copies_list>, <th_tbl>, <th_nr>, <th_lock> fields |
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[23] | 106 | * are defined in all process descriptors copies. |
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[433] | 107 | * 7) The termination <flags> and <exit_status> are only defined in the reference cluster. |
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[1] | 108 | ********************************************************************************************/ |
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| 109 | |
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| 110 | typedef struct process_s |
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| 111 | { |
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[23] | 112 | vmm_t vmm; /*! embedded virtual memory manager */ |
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[1] | 113 | |
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[23] | 114 | fd_array_t fd_array; /*! embedded open file descriptors array */ |
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[1] | 115 | |
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[173] | 116 | xptr_t vfs_root_xp; /*! extended pointer on current VFS root inode */ |
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[428] | 117 | xptr_t vfs_bin_xp; /*! extended pointer on .elf file descriptor */ |
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[23] | 118 | pid_t pid; /*! process identifier */ |
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| 119 | xptr_t ref_xp; /*! extended pointer on reference process */ |
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[428] | 120 | xptr_t parent_xp; /*! extended pointer on parent process */ |
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[1] | 121 | |
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[23] | 122 | xptr_t vfs_cwd_xp; /*! extended pointer on current working dir inode */ |
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| 123 | remote_rwlock_t cwd_lock; /*! lock protecting working directory changes */ |
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[173] | 124 | |
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[23] | 125 | xlist_entry_t children_root; /*! root of the children process xlist */ |
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[428] | 126 | remote_spinlock_t children_lock; /*! lock protecting children process xlist */ |
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[23] | 127 | uint32_t children_nr; /*! number of children processes */ |
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[1] | 128 | |
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[428] | 129 | xlist_entry_t children_list; /*! member of list of children of same parent */ |
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[23] | 130 | xlist_entry_t local_list; /*! member of list of process in same cluster */ |
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| 131 | xlist_entry_t copies_list; /*! member of list of copies of same process */ |
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[428] | 132 | xlist_entry_t txt_list; /*! member of list of processes sharing same TXT */ |
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[1] | 133 | |
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[23] | 134 | spinlock_t th_lock; /*! lock protecting th_tbl[] concurrent access */ |
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| 135 | uint32_t th_nr; /*! number of threads in this cluster */ |
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[428] | 136 | |
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[23] | 137 | struct thread_s * th_tbl[CONFIG_THREAD_MAX_PER_CLUSTER]; /*! pointers on local threads */ |
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[1] | 138 | |
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[23] | 139 | xlist_entry_t sem_root; /*! root of the process semaphore list */ |
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| 140 | xlist_entry_t mutex_root; /*! root of the process mutex list */ |
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| 141 | xlist_entry_t barrier_root; /*! root of the process barrier list */ |
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| 142 | xlist_entry_t condvar_root; /*! root of the process condvar list */ |
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[428] | 143 | remote_spinlock_t sync_lock; /*! lock protecting sem,mutex,barrier,condvar lists */ |
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[1] | 144 | |
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[433] | 145 | uint32_t term_state; /*! termination status (flags & exit status) */ |
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[428] | 146 | |
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| 147 | bool_t txt_owner; /*! current TXT owner */ |
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[1] | 148 | } |
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| 149 | process_t; |
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| 150 | |
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| 151 | /********************************************************************************************* |
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[101] | 152 | * This structure defines the information required by the process_make_exec() function |
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[409] | 153 | * to create a new reference process descriptor, and the associated main thread. |
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[1] | 154 | ********************************************************************************************/ |
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| 155 | |
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| 156 | typedef struct exec_info_s |
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| 157 | { |
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[23] | 158 | char path[CONFIG_VFS_MAX_PATH_LENGTH]; /*! .elf file path */ |
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[1] | 159 | |
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| 160 | char ** args_pointers; /*! physical base address of array of pointers */ |
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| 161 | char * args_buf_base; /*! physical base address of kernel args buffer */ |
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| 162 | uint32_t args_nr; /*! actual number of arguments */ |
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| 163 | |
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| 164 | char ** envs_pointers; /*! physical base address of array of pointers */ |
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| 165 | char * envs_buf_base; /*! physical base address of kernel args buffer */ |
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| 166 | char * envs_buf_free; /*! physical address of first free slot in envs_buf */ |
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| 167 | uint32_t envs_nr; /*! actual number of environment variables */ |
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| 168 | } |
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| 169 | exec_info_t; |
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| 170 | |
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| 171 | /*************** Process Descriptor Operations *****************************************/ |
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| 172 | |
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[173] | 173 | /********************************************************************************************* |
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| 174 | * This function allocates memory in local cluster for a process descriptor. |
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| 175 | ********************************************************************************************* |
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[1] | 176 | * @ returns pointer on process descriptor if success / return NULL if failure |
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| 177 | ********************************************************************************************/ |
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| 178 | process_t * process_alloc(); |
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| 179 | |
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[173] | 180 | /********************************************************************************************* |
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| 181 | * This function releases memory in local cluster for a process descriptor. |
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| 182 | ********************************************************************************************* |
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[1] | 183 | * @ process : pointer on process descriptor to release. |
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| 184 | ********************************************************************************************/ |
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| 185 | void process_free( process_t * process ); |
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| 186 | |
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[173] | 187 | /********************************************************************************************* |
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[428] | 188 | * This function initialize, in each cluster, the kernel "process_zero", that is the owner |
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| 189 | * of all kernel threads in a given cluster. It is called by the kernel_init() function. |
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| 190 | * The process_zero descriptor is allocated as a global variable in file kernel_init.c |
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| 191 | * Both the PID and PPID fields are set to zero, the ref_xp is the local process_zero, |
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| 192 | * and the parent process is set to XPTR_NULL. The th_tbl[] is initialized as empty. |
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| 193 | ********************************************************************************************* |
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| 194 | * @ process : [in] pointer on local process descriptor to initialize. |
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| 195 | ********************************************************************************************/ |
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| 196 | void process_zero_create( process_t * process ); |
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| 197 | |
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| 198 | /********************************************************************************************* |
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[173] | 199 | * This function allocates memory and initializes the "process_init" descriptor and the |
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[409] | 200 | * associated "thread_init" descriptor. It is called once at the end of the kernel |
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[428] | 201 | * initialisation procedure. Its local process identifier is 1, and parent process |
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| 202 | * is the kernel process in cluster 0. |
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[173] | 203 | * The "process_init" is the first user process, and all other user processes will be forked |
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[101] | 204 | * from this process. The code executed by "process_init" is stored in a .elf file, whose |
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[409] | 205 | * pathname is defined by the CONFIG_PROCESS_INIT_PATH configuration variable. |
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[428] | 206 | * The process_init does not use the [STDIN/STDOUT/STDERR] streams, but it is linked |
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| 207 | * to kernel TXT0, because these streams must be defined for all user processes. |
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[173] | 208 | ********************************************************************************************/ |
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[1] | 209 | void process_init_create(); |
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| 210 | |
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[173] | 211 | /********************************************************************************************* |
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[428] | 212 | * This function initializes a local, reference, user process descriptor from another process |
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| 213 | * descriptor, defined by the <model_xp> argument. The <process> and <pid> arguments must |
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| 214 | * be previously allocated by he caller. This function can be called by three functions: |
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| 215 | * 1) process_init_create() : process is the reference INIT process / pid = 1 / |
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| 216 | * the parent and model process descriptors are both the kernel process_zero. |
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| 217 | * 2) process_make_fork() : the model process descriptor is the (generally remote) |
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| 218 | * parent process. |
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| 219 | * 3) process_make exec() : the model process is the local old_process, the new_process |
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| 220 | * parent is the same as the old_process parent. |
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| 221 | * The following fields are initialised : |
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| 222 | * - It set the pid / ppid / ref_xp / parent_xp / state fields. |
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[409] | 223 | * - It initializes the VMM (register the kentry, args, envs vsegs in VSL) |
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[408] | 224 | * - It initializes the FDT, defining the three pseudo files STDIN / STDOUT / STDERR. |
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| 225 | * - It set the root_xp, bin_xp, cwd_xp fields. |
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| 226 | * - It reset the children list as empty, but does NOT register it in parent children list. |
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| 227 | * - It reset the TH_TBL list of threads as empty. |
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| 228 | * - It reset the semaphore / mutex / barrier / condvar lists as empty. |
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| 229 | * - It registers the process in the local_list, rooted in the local cluster manager. |
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| 230 | * - It registers the process in the copies_list, rooted in the owner cluster manager. |
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| 231 | * - It registers the process extended pointer in the local pref_tbl[] array. |
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| 232 | ********************************************************************************************* |
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| 233 | * @ process : [in] pointer on local process descriptor to initialize. |
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| 234 | * @ pid : [in] process identifier. |
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[428] | 235 | * @ parent_xp : [in] extended pointer on parent process descriptor. |
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| 236 | * @ model_xp : [in] extended pointer on model process descriptor. |
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[408] | 237 | ********************************************************************************************/ |
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[1] | 238 | void process_reference_init( process_t * process, |
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| 239 | pid_t pid, |
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[428] | 240 | xptr_t parent_xp, |
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[408] | 241 | xptr_t model_xp ); |
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[1] | 242 | |
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[173] | 243 | /********************************************************************************************* |
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| 244 | * This function initializes a copy process descriptor, in the local cluster, |
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| 245 | * from information defined in the reference remote process descriptor. |
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| 246 | ********************************************************************************************* |
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[1] | 247 | * @ process : [in] local pointer on process descriptor to initialize. |
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| 248 | * @ reference_process_xp : [in] extended pointer on reference process descriptor. |
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| 249 | * @ return 0 if success / return ENOMEM if failure |
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| 250 | ********************************************************************************************/ |
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| 251 | error_t process_copy_init( process_t * local_process, |
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| 252 | xptr_t reference_process_xp ); |
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| 253 | |
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[173] | 254 | /********************************************************************************************* |
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[1] | 255 | * This function releases all memory allocated for a process descriptor in the local cluster, |
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[23] | 256 | * including memory allocated for embedded substructures (fd_array, vmm, etc). |
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[1] | 257 | * The local th_tbl[] array must be empty. |
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[173] | 258 | ********************************************************************************************* |
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[1] | 259 | * @ process : pointer on the process descriptor. |
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| 260 | ********************************************************************************************/ |
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| 261 | void process_destroy( process_t * process ); |
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| 262 | |
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[173] | 263 | /********************************************************************************************* |
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[428] | 264 | * This debug function diplays on the kernel terminal TXT0 detailed informations on a |
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| 265 | * reference process identified by the <process_xp> argument. |
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| 266 | * It can be called by a thread running in any cluster. |
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| 267 | ********************************************************************************************* |
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| 268 | * @ process_xp : extended pointer on reference process. |
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| 269 | ********************************************************************************************/ |
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| 270 | void process_display( xptr_t process_xp ); |
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| 271 | |
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| 272 | /********************************************************************************************* |
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| 273 | * This function returns a printable string defining the sigaction type. |
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| 274 | ********************************************************************************************* |
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| 275 | * @ sigaction_type : BLOCK_ALL_THREADS / UNBLOCK_ALL_THREADS / DELETE_ALL_THREADS |
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| 276 | * @ return a string pointer. |
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| 277 | ********************************************************************************************/ |
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| 278 | char * process_action_str( uint32_t sigaction_type ); |
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| 279 | |
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| 280 | /********************************************************************************************* |
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[435] | 281 | * This function allows a client thread running in any cluster to block, unblock or delete |
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| 282 | * all threads of a process identified by the <pid> argument, depending on the |
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[436] | 283 | * <action_type> argument. |
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| 284 | * WARNING : the DELETE action is NOT executed on the target process main thread |
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| 285 | * (thread 0 in process owner cluster). |
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| 286 | * It uses the multicast, non blocking rpc_process_sigaction_client() function to send |
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| 287 | * parallel requests to all remote clusters containing a process copy. |
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| 288 | * Then it blocks and deschedule to wait completion of these parallel requests. |
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| 289 | * |
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[416] | 290 | * It is used by the sys_kill() & sys_exit() functions to handle the "kill" & "exit" syscalls. |
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| 291 | * It is also used by the process_make_exec() function to handle the "exec" syscall. |
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[436] | 292 | * It is also called by the TXT device ISR to execute the ctrl C & ctrl Z commands. |
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| 293 | * |
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| 294 | * Implementation note: |
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| 295 | * This function allocates a - shared - RPC descriptor in client thread stack, |
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| 296 | * and initializes it. This RPC descriptor can be shared because all parallel, |
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| 297 | * non-blocking, RPC server threads use the same input arguments, including the |
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| 298 | * RPC responses counter field. |
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[409] | 299 | ********************************************************************************************* |
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[435] | 300 | * @ pid : target process identifier. |
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[416] | 301 | * @ action_type : BLOCK_ALL_THREADS / UNBLOCK_ALL_THREADS / DELETE_ALL_THREADS |
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[1] | 302 | ********************************************************************************************/ |
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[435] | 303 | void process_sigaction( pid_t pid, |
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[409] | 304 | uint32_t action_type ); |
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[1] | 305 | |
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[173] | 306 | /********************************************************************************************* |
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[436] | 307 | * This function blocks all threads - but the main thread - for a given <process> |
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| 308 | * in a given cluster. It sets the THREAD_BLOCKED_GLOBAL bit in the thread descriptor, |
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[416] | 309 | * and request the relevant schedulers to acknowledge the blocking, using IPI if required. |
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| 310 | * The threads are not detached from the scheduler, and not detached from the local process. |
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| 311 | * This function returns only when all blockable threads in cluster are actually blocked. |
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[409] | 312 | ********************************************************************************************* |
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| 313 | * @ process : pointer on the target process descriptor. |
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| 314 | ********************************************************************************************/ |
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[433] | 315 | void process_block_threads( process_t * process ); |
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[409] | 316 | |
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| 317 | /********************************************************************************************* |
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| 318 | * This function unblocks all threads of a given user process in a given cluster. |
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| 319 | ********************************************************************************************* |
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| 320 | * @ process : pointer on the process descriptor. |
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| 321 | ********************************************************************************************/ |
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[428] | 322 | void process_unblock_threads( process_t * process ); |
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[409] | 323 | |
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| 324 | /********************************************************************************************* |
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[436] | 325 | * This function marks for deletion all threads - but the main thread - for a given <process> |
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| 326 | * in a given cluster. It sets the THREAD_FLAG_REQ_DELETE bit. For each marked thread, |
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| 327 | * the following actions will be done by the scheduler at the next scheduling point: |
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[416] | 328 | * - the thread will be detached from the scheduler. |
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| 329 | * - the thread will be detached from the local process descriptor. |
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| 330 | * - the thread will be detached from parent if required. |
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| 331 | * - the memory allocated to the thread descriptor is released. |
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| 332 | * - the memory allocated to the process descriptor is released, if it is the last thread. |
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[409] | 333 | ********************************************************************************************* |
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| 334 | * @ process : pointer on the process descriptor. |
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| 335 | ********************************************************************************************/ |
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[433] | 336 | void process_delete_threads( process_t * process ); |
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[409] | 337 | |
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| 338 | /********************************************************************************************* |
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[1] | 339 | * This function returns a pointer on the local copy of a process identified by its PID. |
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[173] | 340 | * If this local copy does not exist yet, it is dynamically created, from the reference |
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[1] | 341 | * process descriptor, registered in the global copies_list, and registered in the local_list. |
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[23] | 342 | * This function is used by the thread_user_create() function. |
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[173] | 343 | ********************************************************************************************* |
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[1] | 344 | * @ pid : searched process identifier. |
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| 345 | * @ returns pointer on the local process descriptor if success / returns NULL if failure. |
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| 346 | ********************************************************************************************/ |
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| 347 | process_t * process_get_local_copy( pid_t pid ); |
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| 348 | |
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[173] | 349 | /********************************************************************************************* |
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[436] | 350 | * This function returns the parent process identifier for a remote process descriptor |
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| 351 | * identified by an extended pointer. |
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| 352 | ********************************************************************************************* |
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| 353 | * @ process_xp : extended pointer on remote process descriptor. |
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| 354 | * @ returns parent process dentifier. |
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| 355 | ********************************************************************************************/ |
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| 356 | pid_t process_get_ppid( xptr_t process_xp ); |
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| 357 | |
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| 358 | /********************************************************************************************* |
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[409] | 359 | * This function implements the "exec" system call, and is called by the sys_exec() function. |
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[408] | 360 | * The "new" process keep the "old" process PID and PPID, all open files, and env variables, |
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| 361 | * the vfs_root and vfs_cwd, but build a brand new memory image (new VMM from the new .elf). |
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[409] | 362 | * It actually creates a "new" reference process descriptor, and copies all relevant |
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| 363 | * information from the "old" process descriptor to the "new" process descriptor. |
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[408] | 364 | * It completes the "new" process descriptor, from information found in the <exec_info> |
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| 365 | * structure (defined in the process.h file), that must be built by the caller. |
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| 366 | * It creates and initializes the associated main thread. It finally destroys all copies |
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[409] | 367 | * of the "old" process in all clusters, and destroys all old associated threads. |
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[408] | 368 | * It is executed in the local cluster, that becomes both the "owner" and the "reference" |
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| 369 | * cluster for the "new" process. |
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[173] | 370 | ********************************************************************************************* |
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[1] | 371 | * @ exec_info : [in] pointer on the exec_info structure. |
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| 372 | * @ return 0 if success / return non-zero if error. |
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| 373 | ********************************************************************************************/ |
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| 374 | error_t process_make_exec( exec_info_t * exec_info ); |
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| 375 | |
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[408] | 376 | /********************************************************************************************* |
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[409] | 377 | * This function implements the "fork" system call, and is called by the sys_fork() function. |
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[408] | 378 | * It allocates memory and initializes a new "child" process descriptor, and the |
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| 379 | * associated "child" thread descriptor in the local cluster. This function can involve |
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| 380 | * up to three different clusters : |
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[433] | 381 | * - the child (local) cluster can be any cluster defined by the sys_fork function. |
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[409] | 382 | * - the parent cluster must be the reference cluster for the parent process. |
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| 383 | * - the client cluster containing the thread requesting the fork can be any cluster. |
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[408] | 384 | * The new "child" process descriptor is initialised from informations found in the "parent" |
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| 385 | * reference process descriptor, containing the complete process description. |
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| 386 | * The new "child" thread descriptor is initialised from informations found in the "parent" |
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| 387 | * thread descriptor. |
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| 388 | ********************************************************************************************* |
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| 389 | * @ parent_process_xp : extended pointer on the reference parent process. |
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| 390 | * @ parent_thread_xp : extended pointer on the parent thread requesting the fork. |
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| 391 | * @ child_pid : [out] child process identifier. |
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| 392 | * @ child_thread_ptr : [out] local pointer on child thread in target cluster. |
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| 393 | * @ return 0 if success / return non-zero if error. |
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| 394 | ********************************************************************************************/ |
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| 395 | error_t process_make_fork( xptr_t parent_process_xp, |
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| 396 | xptr_t parent_thread_xp, |
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| 397 | pid_t * child_pid, |
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| 398 | struct thread_s ** child_thread_ptr ); |
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[1] | 399 | |
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[409] | 400 | |
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[173] | 401 | /******************** File Management Operations ****************************************/ |
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[1] | 402 | |
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| 403 | /********************************************************************************************* |
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[173] | 404 | * This function initializes all entries of the local fd_array as empty. |
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| 405 | ********************************************************************************************* |
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[1] | 406 | * @ process : pointer on the local process descriptor. |
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| 407 | ********************************************************************************************/ |
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| 408 | void process_fd_init( process_t * process ); |
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| 409 | |
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| 410 | /********************************************************************************************* |
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[23] | 411 | * This function uses as many remote accesses as required, to reset an entry in fd_array[], |
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[407] | 412 | * in all clusters containing a copy. The entry is identified by the <fdid> argument. |
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[173] | 413 | * This function must be executed by a thread running reference cluster, that contains |
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[23] | 414 | * the complete list of process descriptors copies. |
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[173] | 415 | ********************************************************************************************* |
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[1] | 416 | * @ process : pointer on the local process descriptor. |
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[407] | 417 | * @ fdid : file descriptor index in the fd_array. |
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[1] | 418 | ********************************************************************************************/ |
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[23] | 419 | void process_fd_remove( process_t * process, |
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[407] | 420 | uint32_t fdid ); |
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[1] | 421 | |
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| 422 | /********************************************************************************************* |
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[173] | 423 | * This function returns an extended pointer on a file descriptor identified by its index |
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[23] | 424 | * in fd_array. It can be called by any thread running in any cluster. |
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[173] | 425 | * It accesses first the local process descriptor. In case of local miss, it uses remote |
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| 426 | * access to access the reference process descriptor. |
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| 427 | * It updates the local fd_array when the file descriptor exists in reference cluster. |
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[23] | 428 | * The file descriptor refcount is not incremented. |
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[173] | 429 | ********************************************************************************************* |
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[1] | 430 | * @ process : pointer on the local process descriptor. |
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[407] | 431 | * @ fdid : file descriptor index in the fd_array. |
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[23] | 432 | * @ return extended pointer on file descriptor if success / return XPTR_NULL if not found. |
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[1] | 433 | ********************************************************************************************/ |
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[23] | 434 | xptr_t process_fd_get_xptr( process_t * process, |
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[407] | 435 | uint32_t fdid ); |
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[1] | 436 | |
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| 437 | /********************************************************************************************* |
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[173] | 438 | * This function checks the number of open files for a given process. |
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[23] | 439 | * It can be called by any thread in any cluster, because it uses portable remote access |
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| 440 | * primitives to access the reference process descriptor. |
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[173] | 441 | ********************************************************************************************* |
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[23] | 442 | * @ returns true if file descriptor array full. |
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[1] | 443 | ********************************************************************************************/ |
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[23] | 444 | bool_t process_fd_array_full(); |
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[1] | 445 | |
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| 446 | /********************************************************************************************* |
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[23] | 447 | * This function allocates a free slot in the fd_array of the reference process, |
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| 448 | * register the <file_xp> argument in the allocated slot, and return the slot index. |
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| 449 | * It can be called by any thread in any cluster, because it uses portable remote access |
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| 450 | * primitives to access the reference process descriptor. |
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[173] | 451 | ********************************************************************************************* |
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[23] | 452 | * @ file_xp : extended pointer on the file descriptor to be registered. |
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[407] | 453 | * @ fdid : [out] buffer for fd_array slot index. |
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[23] | 454 | * @ return 0 if success / return EMFILE if array full. |
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[1] | 455 | ********************************************************************************************/ |
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[407] | 456 | error_t process_fd_register( process_t * process, |
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| 457 | xptr_t file_xp, |
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| 458 | uint32_t * fdid ); |
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[1] | 459 | |
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| 460 | /********************************************************************************************* |
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[409] | 461 | * This function copies all non-zero entries (other than the three first stdin/stdout/stderr) |
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| 462 | * from a remote <src_xp> fd_array, embedded in a process descriptor, to another remote |
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| 463 | * <dst_xp> fd_array, embedded in another process descriptor. |
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| 464 | * The calling thread can be running in any cluster. |
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[1] | 465 | * It takes the remote lock protecting the <src_xp> fd_array during the copy. |
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[173] | 466 | * For each involved file descriptor, the refcount is incremented. |
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| 467 | ********************************************************************************************* |
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[1] | 468 | * @ dst_xp : extended pointer on the destination fd_array_t. |
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| 469 | * @ src_xp : extended pointer on the source fd_array_t. |
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| 470 | ********************************************************************************************/ |
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| 471 | void process_fd_remote_copy( xptr_t dst_xp, |
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| 472 | xptr_t src_xp ); |
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| 473 | |
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| 474 | |
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[23] | 475 | |
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[173] | 476 | /******************** Thread Related Operations *****************************************/ |
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[1] | 477 | |
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| 478 | /********************************************************************************************* |
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| 479 | * This function registers a new thread in the local process descriptor. |
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| 480 | * It checks that there is an available slot in the local th_tbl[] array, |
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| 481 | * allocates a new LTID, and registers the new thread in the th_tbl[]. |
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| 482 | * WARNING : the lock protecting the th_tbl[] must be taken by the caller. |
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[173] | 483 | ********************************************************************************************* |
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[1] | 484 | * @ process : pointer on the local process descriptor. |
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| 485 | * @ thread : pointer on new thread to be registered. |
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| 486 | * @ trdid : [out] address of buffer for allocated trdid. |
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| 487 | * @ returns 0 if success / returns non zero if no slot available. |
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| 488 | ********************************************************************************************/ |
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| 489 | error_t process_register_thread( process_t * process, |
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| 490 | struct thread_s * thread, |
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| 491 | trdid_t * trdid ); |
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| 492 | |
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| 493 | /********************************************************************************************* |
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| 494 | * This function removes a thread registration from the local process descriptor. |
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| 495 | * WARNING : the lock protecting the th_tbl[] must be taken by the caller. |
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[173] | 496 | ********************************************************************************************* |
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[1] | 497 | * @ thread : local pointer on thread to be removed. |
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| 498 | ********************************************************************************************/ |
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| 499 | void process_remove_thread( struct thread_s * thread ); |
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| 500 | |
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| 501 | |
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[428] | 502 | /*************** Terminals related operations ********************************************/ |
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[1] | 503 | |
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[428] | 504 | /********************************************************************************************* |
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| 505 | * This function scan the set of user TXT terminals to find a free terminal |
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| 506 | * (the list of attached processes is empty for a free TXT terminal). |
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| 507 | * It is called only by the process_reference_init() function when creating a KSH process. |
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| 508 | * It makes a kernel panic if no free TXT terminal is found. |
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| 509 | * As a KSH process is never deleted, the allocated TXT terminal is never released. |
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| 510 | ********************************************************************************************* |
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| 511 | * @ return TXT terminal index if succes / kernel panic if no terminal found. |
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| 512 | ********************************************************************************************/ |
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| 513 | uint32_t process_txt_alloc(); |
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| 514 | |
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| 515 | /********************************************************************************************* |
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[436] | 516 | * This function attach a process descriptor in owner cluster, identified by the <process> |
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[428] | 517 | * argument to a TXT terminal, identified by its <txt_id> channel index argument. |
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| 518 | * It insert the process descriptor in the xlist rooted in the TXT_RX device. |
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| 519 | * It is called by the process_reference_init() function. |
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| 520 | ********************************************************************************************* |
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| 521 | * @ process : local pointer on process descriptor. |
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| 522 | * @ txt_id : TXT channel index. |
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| 523 | ********************************************************************************************/ |
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| 524 | void process_txt_attach( process_t * process, |
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| 525 | uint32_t txt_id ); |
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| 526 | |
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| 527 | /********************************************************************************************* |
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[436] | 528 | * This function detach a process, identified by the <process_xp> argument, |
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| 529 | * from the list of process attached to a given TXT terminal. |
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| 530 | * The target process descriptor must be in the owner cluster, but the calling thread can |
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| 531 | * be running in any cluster. |
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[428] | 532 | ********************************************************************************************* |
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[436] | 533 | * @ process_xp : extended pointer on process descriptor. |
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[428] | 534 | ********************************************************************************************/ |
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[436] | 535 | void process_txt_detach( xptr_t process_xp ); |
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[428] | 536 | |
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| 537 | /********************************************************************************************* |
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[436] | 538 | * This function gives to a process identified by the <owner_xp> argument, and attached |
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[428] | 539 | * to terminal TXT[i] the exclusive ownership of the TXT_RX[i] terminal. |
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[436] | 540 | * The process descriptor must be in the process owner cluster. |
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[428] | 541 | ********************************************************************************************* |
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[436] | 542 | * @ owner_xp : extended pointer on process descriptor in owner cluster. |
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[428] | 543 | ********************************************************************************************/ |
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[436] | 544 | void process_txt_set_ownership( xptr_t owner_xp ); |
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[428] | 545 | |
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| 546 | /********************************************************************************************* |
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[436] | 547 | * When the process dentified by the <owner_xp> argument has the exclusive ownership of |
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| 548 | * the TXT_RX terminal, this function transfer this ownership to another attached process. |
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| 549 | * The process descriptor must be in the process owner cluster. |
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| 550 | * This function does nothing if the <pid> process is not the owner. |
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| 551 | * - If the current owner is not the KSH process, the new owner is the KSH process. |
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| 552 | * - If the <pid> process is the the KSH process, the new owner is another attached process. |
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| 553 | * - If there is no other attached process, the TXT has no more defined owner. |
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[428] | 554 | ********************************************************************************************* |
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[436] | 555 | * @ owner_xp : extended pointer on process descriptor in owner cluster. |
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[428] | 556 | ********************************************************************************************/ |
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[436] | 557 | void process_txt_transfer_ownership( xptr_t owner_xp ); |
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[428] | 558 | |
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[435] | 559 | /********************************************************************************************* |
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[436] | 560 | * This function returns the TXT owner process (foreground process) |
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[435] | 561 | * for a given TXT terminal identified by its <channel> index. |
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| 562 | ********************************************************************************************* |
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| 563 | * @ channel : TXT terminal channel. |
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[436] | 564 | * @ return extentded pointer on TXT owner process in owner cluster. |
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[435] | 565 | ********************************************************************************************/ |
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[436] | 566 | xptr_t process_txt_get_owner( uint32_t channel ); |
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[435] | 567 | |
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| 568 | /********************************************************************************************* |
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| 569 | * This debug function diplays on the kernel terminal the list of processes attached |
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| 570 | * to a given terminal identified by the <txt_id> argument. |
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| 571 | ********************************************************************************************* |
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| 572 | * @ txt_id : TXT terminal channel. |
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| 573 | ********************************************************************************************/ |
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| 574 | void process_txt_display( uint32_t txt_id ); |
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| 575 | |
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| 576 | |
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[1] | 577 | #endif /* _PROCESS_H_ */ |
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