source: trunk/kernel/syscalls/sys_thread_exit.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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