[410] | 1 | /* |
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[416] | 2 | * sys_exit.c - Kernel function implementing the "exit" system call. |
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[410] | 3 | * |
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| 4 | * Author Alain Greiner (2016,2017) |
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| 5 | * |
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| 6 | * Copyright (c) UPMC Sorbonne Universites |
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| 7 | * |
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| 8 | * This file is part of ALMOS-MKH. |
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| 9 | * |
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 11 | * under the terms of the GNU General Public License as published by |
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| 12 | * the Free Software Foundation; version 2.0 of the License. |
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| 13 | * |
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 17 | * General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | |
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| 24 | #include <kernel_config.h> |
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| 25 | #include <hal_types.h> |
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| 26 | #include <hal_irqmask.h> |
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| 27 | #include <errno.h> |
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| 28 | #include <thread.h> |
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| 29 | #include <printk.h> |
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| 30 | #include <process.h> |
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[435] | 31 | #include <shared_syscalls.h> |
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[410] | 32 | #include <cluster.h> |
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| 33 | #include <rpc.h> |
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| 34 | |
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| 35 | /////////////////////////////// |
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| 36 | int sys_exit( uint32_t status ) |
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| 37 | { |
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[433] | 38 | reg_t save_sr; // required to enable IRQs |
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[410] | 39 | |
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[433] | 40 | thread_t * this = CURRENT_THREAD; |
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| 41 | process_t * process = this->process; |
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| 42 | pid_t pid = process->pid; |
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[436] | 43 | trdid_t trdid = this->trdid; |
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[416] | 44 | |
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[438] | 45 | #if DEBUG_SYS_EXIT |
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[410] | 46 | uint64_t tm_start; |
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| 47 | uint64_t tm_end; |
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| 48 | tm_start = hal_get_cycles(); |
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[438] | 49 | if( DEBUG_SYS_EXIT < tm_start ) |
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[433] | 50 | printk("\n[DBG] %s : thread %x enter / process %x / status %x / cycle %d\n", |
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| 51 | __FUNCTION__ , this, pid , status , (uint32_t)tm_start ); |
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[410] | 52 | #endif |
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| 53 | |
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[435] | 54 | // get owner cluster |
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| 55 | cxy_t owner_cxy = CXY_FROM_PID( pid ); |
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[410] | 56 | |
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[435] | 57 | // exit must be called by the main thread |
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[436] | 58 | if( (owner_cxy != local_cxy) || (LTID_FROM_TRDID( trdid ) != 0) ) |
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[435] | 59 | { |
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[433] | 60 | |
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[438] | 61 | #if DEBUG_SYSCALLS_ERROR |
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[436] | 62 | printk("\n[ERROR] in %s : calling thread %x is not thread 0 in owner cluster %x\n", |
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| 63 | __FUNCTION__, trdid, owner_cxy ); |
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[435] | 64 | #endif |
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| 65 | this->errno = EINVAL; |
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| 66 | return -1; |
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| 67 | } |
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| 68 | |
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[410] | 69 | // enable IRQs |
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| 70 | hal_enable_irq( &save_sr ); |
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| 71 | |
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[435] | 72 | // register exit_status in owner process descriptor |
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| 73 | process->term_state = status; |
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[410] | 74 | |
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[438] | 75 | #if( DEBUG_SYS_EXIT & 1) |
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[436] | 76 | printk("\n[DBG] %s : set exit status in process term_state\n", __FUNCTION__); |
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| 77 | #endif |
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[435] | 78 | |
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[436] | 79 | // remove process from TXT list |
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| 80 | process_txt_detach( XPTR( local_cxy , process ) ); |
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[435] | 81 | |
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[438] | 82 | #if( DEBUG_SYS_EXIT & 1) |
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[436] | 83 | printk("\n[DBG] %s : removed from TXT list\n", __FUNCTION__); |
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| 84 | #endif |
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| 85 | |
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| 86 | // mark for delete all process threads in all clusters (but the main) |
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[435] | 87 | process_sigaction( pid , DELETE_ALL_THREADS ); |
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| 88 | |
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[438] | 89 | #if( DEBUG_SYS_EXIT & 1) |
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[436] | 90 | printk("\n[DBG] %s : deleted all other threads than main\n", __FUNCTION__); |
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| 91 | #endif |
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| 92 | |
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[410] | 93 | // restore IRQs |
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| 94 | hal_restore_irq( save_sr ); |
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| 95 | |
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[436] | 96 | // block the main thread itself |
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| 97 | thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_GLOBAL ); |
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| 98 | |
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[438] | 99 | #if( DEBUG_SYS_EXIT & 1) |
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[436] | 100 | printk("\n[DBG] %s : blocked the main thread\n", __FUNCTION__); |
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| 101 | #endif |
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| 102 | |
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| 103 | // atomically update owner process descriptor term_state to ask |
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| 104 | // the parent process sys_wait() function to delete this main thread |
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[435] | 105 | hal_remote_atomic_or( XPTR( local_cxy , &process->term_state ) , |
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| 106 | PROCESS_TERM_EXIT ); |
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[436] | 107 | |
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[438] | 108 | #if( DEBUG_SYS_EXIT & 1) |
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[436] | 109 | printk("\n[DBG] %s : set EXIT flag in process term_state\n", __FUNCTION__); |
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| 110 | #endif |
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| 111 | |
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[410] | 112 | hal_fence(); |
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| 113 | |
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[438] | 114 | #if DEBUG_SYS_EXIT |
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[410] | 115 | tm_end = hal_get_cycles(); |
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[438] | 116 | if( DEBUG_SYS_EXIT < tm_end ) |
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[433] | 117 | printk("\n[DBG] %s : thread %x exit / process %x / status %x / cost = %d / cycle %d\n", |
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| 118 | __FUNCTION__, this, pid, status, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end ); |
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[410] | 119 | #endif |
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| 120 | |
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[436] | 121 | // main thread deschedule |
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| 122 | sched_yield( "process exit" ); |
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| 123 | |
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| 124 | // this code should never be executed |
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| 125 | assert( false , __FUNCTION__ , "this code should not be executed...\n" ); |
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[410] | 126 | return 0; |
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| 127 | |
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| 128 | } // end sys_exit() |
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| 129 | |
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