source: trunk/kernel/syscalls/sys_thread_exit.c @ 296

Last change on this file since 296 was 296, checked in by alain, 4 years ago

Several modifs in the generic scheduler and in the hal_context to
fix the context switch mechanism.

File size: 2.7 KB
Line 
1/*
2 * sys_thread_exit.c - terminates the execution of current thread
3 *
4 * Authors       Ghassan Almaless (2008,2009,2010,2011,2012)
5 *               Alain Greiner (2016,2017)
6 *
7 * Copyright (c) UPMC Sorbonne Universites
8 *
9 * This file is part of ALMOS-MKH.
10 *
11 * ALMOS-MKH is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2.0 of the License.
14 *
15 * ALMOS-MKH is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25#include <hal_types.h>
26#include <hal_irqmask.h>
27#include <thread.h>
28#include <core.h>
29#include <scheduler.h>
30#include <printk.h>
31
32
33////////////////////////////////////////
34int sys_thread_exit( void * exit_value )
35{
36        thread_t  * this = CURRENT_THREAD;
37    core_t    * core = this->core;
38    reg_t       irq_state;
39
40    // register the exit_value in thread descriptor
41    this->exit_value = exit_value;
42
43    // we enter the join loop to wait the join
44    // only if thread is joinable
45    if( (this->flags & THREAD_FLAG_DETACHED) == 0 )
46    {
47            while( 1 ) 
48            {
49            // take the lock protecting the flags
50                remote_spinlock_lock( XPTR( local_cxy, &this->flags_lock ) );
51
52            // check the JOIN flag
53            if( this->flags & THREAD_FLAG_JOIN )       // parent made a join
54            {
55                // unblock the parent thread
56                thread_unblock( this->parent , THREAD_BLOCKED_JOIN );
57
58                // release the lock protecting the flags
59                    remote_spinlock_unlock( XPTR( local_cxy, &this->flags_lock ) );
60
61                // exit while
62                break;
63            }
64            else                                       // no join done by parent thread
65            {
66                // set the EXIT flag
67                this->flags |= THREAD_FLAG_EXIT;
68
69                // block this thread
70                thread_block( this , THREAD_BLOCKED_EXIT );
71
72                // release the lock protecting the flags
73                    remote_spinlock_unlock( XPTR( local_cxy, &this->flags_lock ) );
74
75                // deschedule
76                sched_yield( NULL );
77            }     
78        }
79        }
80
81        // Release FPU if required
82        hal_disable_irq( &irq_state );
83        if( core->fpu_owner == this )  core->fpu_owner = NULL;
84        hal_restore_irq( irq_state );
85
86        // suicide
87    thread_kill( this );
88        return 0;       
89
90}  // end sys_thread_exit()
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