| 1 | /* |
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| 2 | * sys_thread_exit.c - terminates the execution of calling thread |
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| 3 | * |
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| 4 | * Authors Alain Greiner (2016,2017,2018) |
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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 <hal_kernel_types.h> |
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| 25 | #include <hal_irqmask.h> |
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| 26 | #include <thread.h> |
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| 27 | #include <process.h> |
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| 28 | #include <core.h> |
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| 29 | #include <vmm.h> |
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| 30 | #include <scheduler.h> |
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| 31 | #include <printk.h> |
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| 32 | |
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| 33 | #include <syscalls.h> |
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| 34 | |
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| 35 | //////////////////////////////////////// |
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| 36 | int sys_thread_exit( void * exit_value ) |
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| 37 | { |
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| 38 | thread_t * this = CURRENT_THREAD; |
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| 39 | trdid_t trdid = this->trdid; |
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| 40 | process_t * process = this->process; |
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| 41 | pid_t pid = process->pid; |
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| 42 | |
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| 43 | // check exit_value argument |
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| 44 | if( exit_value != NULL ) |
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| 45 | { |
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| 46 | |
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| 47 | #if DEBUG_SYSCALLS_ERROR |
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| 48 | printk("\n[ERROR] in %s : exit_value argument must be NULL / thread %x in process %x\n", |
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| 49 | __FUNCTION__ , this , pid ); |
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| 50 | #endif |
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| 51 | this->errno = EINVAL; |
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| 52 | return -1; |
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| 53 | } |
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| 54 | |
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| 55 | |
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| 56 | // If calling thread is the main thread, the process must be deleted. |
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| 57 | // => delete all process threads and synchronise with parent process. |
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| 58 | // If calling thread is not the main thread, it must be deleted. |
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| 59 | // => block the thread and mark it for delete. |
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| 60 | if( (CXY_FROM_PID( pid ) == local_cxy) && (LTID_FROM_TRDID(trdid) == 0) ) |
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| 61 | { |
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| 62 | |
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| 63 | #if DEBUG_SYS_THREAD_EXIT |
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| 64 | uint64_t tm_start = hal_get_cycles(); |
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| 65 | if( DEBUG_SYS_THREAD_EXIT < tm_start ) |
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| 66 | printk("\n[DBG] %s : thread[%x,%x] / main => delete process / cycle %d\n", |
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| 67 | __FUNCTION__ , pid , trdid , (uint32_t)tm_start ); |
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| 68 | #endif |
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| 69 | // delete process |
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| 70 | sys_exit( 0 ); |
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| 71 | } |
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| 72 | else |
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| 73 | { |
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| 74 | |
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| 75 | #if DEBUG_SYS_THREAD_EXIT |
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| 76 | uint64_t tm_start = hal_get_cycles(); |
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| 77 | if( DEBUG_SYS_THREAD_EXIT < tm_start ) |
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| 78 | printk("\n[DBG] %s : thread[%x,%x] / not main => delete thread / cycle %d\n", |
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| 79 | __FUNCTION__ , pid , trdid , (uint32_t)tm_start ); |
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| 80 | #endif |
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| 81 | // block calling thread and mark it for delete, |
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| 82 | thread_delete( XPTR( local_cxy , this ) , pid , false ); |
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| 83 | |
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| 84 | // deschedule |
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| 85 | sched_yield( "suicide after thread_exit" ); |
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| 86 | } |
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| 87 | |
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| 88 | return 0; // never executed but required by compiler |
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| 89 | |
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| 90 | } // end sys_thread exit |
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