source: trunk/kernel/syscalls/sys_thread_exit.c @ 16

Last change on this file since 16 was 16, checked in by alain, 7 years ago

mprove the HAL for interrupt, exception, syscall handling.

File size: 2.3 KB
Line 
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    core_t    * core = this->core;
36        bool_t      isEmpty;
37        bool_t      isReleased;
38    uint32_t    irq_state;
39
40        // update DQDT TODO must be done by thread destroy
41        if(this->process->pid != 1) dqdt_local_update_threads( -1 );
42
43        spinlock_lock( &this->lock );
44
45        if(!(thread_isJoinable(this)))
46        {
47                goto exit_dead;
48        }
49
50        // Check if there's a thread waiting the end of calling thread
51        isEmpty = wait_queue_isEmpty(&this->info.wait_queue);
52
53        if(isEmpty)
54        {
55                this->info.exit_value = exit_val;
56                wait_on(&this->info.wait_queue, WAIT_ANY);
57                spinlock_unlock_nosched(&this->lock);
58                sched_sleep(this);
59        }
60        else
61        {
62                this->info.join->info.exit_value = exit_val;
63                wakeup_one(&this->info.wait_queue, WAIT_ANY);
64                spinlock_unlock_nosched(&this->lock);
65        }
66
67exit_dead:
68
69        isReleased = false;
70
71        // Release FPU if required
72        hal_disable_irq( &irq_state );
73        if(core->fpu_owner == this)
74        {
75                core->fpu_owner = NULL;
76                isReleased = true;
77        }
78        hal_restore_irq( irq_state );
79
80        if(isReleased)
81        {
82                thread_dmsg(1, "INFO: Thread %x has released FPU on CPU %d\n",
83                       this, 
84                       current_cpu->gid);
85        }
86
87        sched_exit(this);
88
89        PANIC ("Thread %x, CPU %d must never return", this, current_cpu->gid);
90        return -1;              /* Fake return ! */
91}
Note: See TracBrowser for help on using the repository browser.