source: trunk/kernel/syscalls/sys_thread_exit.c @ 436

Last change on this file since 436 was 436, checked in by alain, 4 years ago

1) improve the threads and process destruction mechanism.
2) introduce FIFOs in the soclib_tty driver.

File size: 2.3 KB
Line 
1/*
2 * sys_thread_exit.c - terminates the execution of calling thread
3 *
4 * Authors   Alain Greiner (2016,2017)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <hal_types.h>
25#include <thread.h>
26#include <core.h>
27#include <vmm.h>
28#include <scheduler.h>
29#include <printk.h>
30
31////////////////////////////////////////
32int sys_thread_exit( void * exit_value )
33{
34        thread_t  * this    = CURRENT_THREAD;
35    process_t * process = this->process;
36
37    // check exit_value argument
38    if( exit_value != NULL )
39    {
40
41#if CONFIG_DEBUG_SYSCALLS_ERROR
42printk("\n[ERROR] in %s : exit_value argument must be NULL for thread %x in process %x\n",
43__FUNCTION__ , exit_value, this->trdid , process->pid );
44#endif
45        this->errno = EINVAL;
46        return -1;
47    }
48
49#if CONFIG_DEBUG_SYS_THREAD_EXIT
50uint64_t     tm_start;
51uint64_t     tm_end;
52tm_start = hal_get_cycles();
53if( CONFIG_DEBUG_SYS_THREAD_EXIT < tm_start )
54printk("\n[DBG] %s : thread %x enter / process %x / cycle %d\n",
55__FUNCTION__ , this, process->pid , (uint32_t)tm_start );
56#endif
57
58    // cal the relevant kernel function
59    thread_kill( XPTR( local_cxy , this ),
60                 1,           // is_exit
61                 0 );         // is forced
62
63#if CONFIG_DEBUG_SYS_THREAD_EXIT
64tm_end = hal_get_cycles();
65if( CONFIG_DEBUG_SYS_THREAD_EXIT < tm_end )
66printk("\n[DBG] %s : thread %x exit / process %x / cost %d / cycle %d\n",
67__FUNCTION__, this, this->process->pid, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end );
68#endif
69
70    // deschedule <=> suicide, because blocked by thread_kill()
71    sched_yield( "suicide after thread_exit" );
72   
73    return 0;   // never executed but required by compiler
74
75}  // end sys_thread exit
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