[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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[440] | 4 | * Author Alain Greiner (2016,2017,2018) |
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[410] | 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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[416] | 43 | |
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[438] | 44 | #if DEBUG_SYS_EXIT |
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[410] | 45 | uint64_t tm_start; |
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| 46 | uint64_t tm_end; |
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| 47 | tm_start = hal_get_cycles(); |
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[438] | 48 | if( DEBUG_SYS_EXIT < tm_start ) |
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[433] | 49 | printk("\n[DBG] %s : thread %x enter / process %x / status %x / cycle %d\n", |
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| 50 | __FUNCTION__ , this, pid , status , (uint32_t)tm_start ); |
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[410] | 51 | #endif |
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| 52 | |
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[443] | 53 | // get owner process descriptor pointers |
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| 54 | xptr_t owner_xp = process->owner_xp; |
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[440] | 55 | cxy_t owner_cxy = GET_CXY( owner_xp ); |
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| 56 | process_t * owner_ptr = GET_PTR( owner_xp ); |
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[410] | 57 | |
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[440] | 58 | // get pointers on the process main thread |
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| 59 | thread_t * main = hal_remote_lpt( XPTR( owner_cxy , &owner_ptr->th_tbl[0] ) ); |
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[433] | 60 | |
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[410] | 61 | // enable IRQs |
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| 62 | hal_enable_irq( &save_sr ); |
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| 63 | |
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[443] | 64 | // mark for delete all process threads in all clusters, |
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| 65 | // but the main thread and this calling thread |
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[440] | 66 | process_sigaction( pid , DELETE_ALL_THREADS ); |
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[410] | 67 | |
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[440] | 68 | // disable IRQs |
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| 69 | hal_restore_irq( save_sr ); |
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| 70 | |
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[438] | 71 | #if( DEBUG_SYS_EXIT & 1) |
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[440] | 72 | if( tm_start > DEBUG_SYS_EXIT ) |
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| 73 | printk("\n[DBG] %s : thread %x deleted threads / process %x\n", |
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| 74 | __FUNCTION__ , this, pid ); |
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[436] | 75 | #endif |
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[435] | 76 | |
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[440] | 77 | // mark for delete this calling thread when it is not the main |
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| 78 | if( (owner_cxy != local_cxy) || (main != this) ) |
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| 79 | { |
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[435] | 80 | |
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[438] | 81 | #if( DEBUG_SYS_EXIT & 1) |
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[440] | 82 | if( tm_start > DEBUG_SYS_EXIT ) |
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[443] | 83 | printk("\n[DBG] %s : calling thread %x marked iself for delete / process %x\n", |
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[440] | 84 | __FUNCTION__ , this, pid ); |
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[436] | 85 | #endif |
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[440] | 86 | thread_delete( XPTR( local_cxy , this ) , pid , true ); |
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| 87 | } |
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| 88 | |
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| 89 | // remove process from TXT list |
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| 90 | process_txt_detach( owner_xp ); |
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[436] | 91 | |
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[438] | 92 | #if( DEBUG_SYS_EXIT & 1) |
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[440] | 93 | if( tm_start > DEBUG_SYS_EXIT ) |
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| 94 | printk("\n[DBG] %s : thread %x removed process %x from TXT list\n", |
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| 95 | __FUNCTION__ , this, pid ); |
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[436] | 96 | #endif |
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| 97 | |
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[440] | 98 | // block the main thread |
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| 99 | thread_block( XPTR( owner_cxy , main ) , THREAD_BLOCKED_GLOBAL ); |
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[410] | 100 | |
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[438] | 101 | #if( DEBUG_SYS_EXIT & 1) |
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[440] | 102 | if( tm_start > DEBUG_SYS_EXIT ) |
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| 103 | printk("\n[DBG] %s : thread %x blocked main thread for process %x\n", |
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| 104 | __FUNCTION__, this , pid ); |
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[436] | 105 | #endif |
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| 106 | |
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| 107 | // atomically update owner process descriptor term_state to ask |
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[440] | 108 | // the parent process sys_wait() function to delete the main thread |
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| 109 | hal_remote_atomic_or( XPTR( owner_cxy , &process->term_state ) , |
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| 110 | PROCESS_TERM_EXIT | (status & 0xFF) ); |
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[436] | 111 | |
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[438] | 112 | #if( DEBUG_SYS_EXIT & 1) |
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[440] | 113 | if( tm_start > DEBUG_SYS_EXIT ) |
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| 114 | printk("\n[DBG] %s : thread %x set exit status in process %x term_state\n", |
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| 115 | __FUNCTION__ , this, pid ); |
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[436] | 116 | #endif |
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| 117 | |
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[410] | 118 | hal_fence(); |
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| 119 | |
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[438] | 120 | #if DEBUG_SYS_EXIT |
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[410] | 121 | tm_end = hal_get_cycles(); |
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[438] | 122 | if( DEBUG_SYS_EXIT < tm_end ) |
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[433] | 123 | printk("\n[DBG] %s : thread %x exit / process %x / status %x / cost = %d / cycle %d\n", |
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| 124 | __FUNCTION__, this, pid, status, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end ); |
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[410] | 125 | #endif |
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| 126 | |
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[440] | 127 | // this thread deschedule |
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[436] | 128 | sched_yield( "process exit" ); |
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| 129 | |
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[410] | 130 | return 0; |
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| 131 | |
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| 132 | } // end sys_exit() |
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| 133 | |
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