| 1 | /* |
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| 2 | * kern/sys_thread_exit.c - terminates the execution of current thread |
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| 3 | * |
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| 4 | * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless |
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| 5 | * Copyright (c) 2011,2012 UPMC Sorbonne Universites |
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| 6 | * |
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| 7 | * This file is part of ALMOS-kernel. |
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| 8 | * |
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| 9 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
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| 10 | * under the terms of the GNU General Public License as published by |
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| 11 | * the Free Software Foundation; version 2.0 of the License. |
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| 12 | * |
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| 13 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
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| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU General Public License |
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| 19 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
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| 20 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |
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| 23 | #include <list.h> |
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| 24 | #include <thread.h> |
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| 25 | #include <scheduler.h> |
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| 26 | #include <wait_queue.h> |
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| 27 | #include <cluster.h> |
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| 28 | #include <dqdt.h> |
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| 29 | #include <process.h> |
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| 30 | |
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| 31 | /////////////////////////////////////// |
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| 32 | int sys_thread_exit ( void * exit_val ) |
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| 33 | { |
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| 34 | thread_t * this = current_thread; |
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| 35 | cpu_t * cpu = current_cpu; |
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| 36 | uint32_t state; |
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| 37 | bool_t isEmpty; |
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| 38 | bool_t isReleased; |
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| 39 | |
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| 40 | /* TODO: the cpu->lid must match the core index in the logical cluster */ |
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| 41 | if(this->process->pid != 1) |
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| 42 | dqdt_update_threads_number( local_cxy , cpu->lid , -1 ); |
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| 43 | |
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| 44 | spinlock_lock( &this->lock ); |
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| 45 | |
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| 46 | if(!(thread_isJoinable(this))) |
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| 47 | { |
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| 48 | spinlock_unlock_nosched(&this->lock); |
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| 49 | goto exit_dead; |
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| 50 | } |
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| 51 | |
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| 52 | // Check if there's a thread waiting the end of callee thread |
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| 53 | isEmpty = wait_queue_isEmpty(&this->info.wait_queue); |
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| 54 | |
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| 55 | if(isEmpty) |
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| 56 | { |
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| 57 | this->info.exit_value = exit_val; |
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| 58 | wait_on(&this->info.wait_queue, WAIT_ANY); |
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| 59 | spinlock_unlock_nosched(&this->lock); |
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| 60 | sched_sleep(this); |
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| 61 | } |
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| 62 | else |
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| 63 | { |
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| 64 | this->info.join->info.exit_value = exit_val; |
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| 65 | wakeup_one(&this->info.wait_queue, WAIT_ANY); |
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| 66 | spinlock_unlock_nosched(&this->lock); |
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| 67 | } |
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| 68 | |
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| 69 | exit_dead: |
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| 70 | |
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| 71 | isReleased = false; |
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| 72 | |
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| 73 | // Release FPU if required |
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| 74 | cpu_disable_all_irq(&state); |
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| 75 | if(current_cpu->fpu_owner == this) |
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| 76 | { |
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| 77 | current_cpu->fpu_owner = NULL; |
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| 78 | isReleased = true; |
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| 79 | } |
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| 80 | cpu_restore_irq(state); |
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| 81 | |
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| 82 | if(isReleased) |
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| 83 | { |
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| 84 | thread_dmsg(1, "INFO: Thread %x has released FPU on CPU %d\n", |
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| 85 | this, |
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| 86 | current_cpu->gid); |
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| 87 | } |
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| 88 | |
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| 89 | sched_exit(this); |
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| 90 | |
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| 91 | PANIC ("Thread %x, CPU %d must never return", this, current_cpu->gid); |
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| 92 | return -1; /* Fake return ! */ |
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| 93 | } |
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