source: trunk/kernel/syscalls/sys_thread_exit.c @ 625

Last change on this file since 625 was 625, checked in by alain, 2 years ago

Fix a bug in the vmm_remove_vseg() function: the physical pages
associated to an user DATA vseg were released to the kernel when
the target process descriptor was in the reference cluster.
This physical pages release should be done only when the page
forks counter value is zero.
All other modifications are cosmetic.

File size: 2.7 KB
Line 
1/*
2 * sys_thread_exit.c - terminates the execution of calling thread
3 *
4 * Authors   Alain Greiner (2016,2017,2018)
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_kernel_types.h>
25#include <hal_irqmask.h>
26#include <thread.h>
27#include <process.h>
28#include <core.h>
29#include <vmm.h>
30#include <scheduler.h>
31#include <printk.h>
32
33#include <syscalls.h>
34
35////////////////////////////////////////
36int sys_thread_exit( void * exit_value )
37{
38        thread_t  * this      = CURRENT_THREAD;
39    trdid_t     trdid     = this->trdid;
40    process_t * process   = this->process;
41    pid_t       pid       = process->pid;
42
43    // check exit_value argument
44    if( exit_value != NULL )
45    {
46
47#if DEBUG_SYSCALLS_ERROR
48printk("\n[ERROR] in %s : exit_value argument must be NULL / thread %x in process %x\n",
49__FUNCTION__ , this , pid );
50#endif
51        this->errno = EINVAL;
52        return -1;
53    }
54
55
56    // If calling thread is the main thread, the process must be deleted.
57    // => delete all process threads and synchronise with parent process.
58    // If calling thread is not the main thread, it must be deleted.
59    // => block the thread and mark it for delete.
60    if( (CXY_FROM_PID( pid ) == local_cxy) && (LTID_FROM_TRDID(trdid) == 0) )
61    {
62
63#if DEBUG_SYS_THREAD_EXIT
64uint64_t     tm_start = hal_get_cycles();
65if( DEBUG_SYS_THREAD_EXIT < tm_start )
66printk("\n[%s] thread[%x,%x] is main => delete process / cycle %d\n",
67__FUNCTION__ , pid , trdid , (uint32_t)tm_start );
68#endif
69        // delete process
70        sys_exit( 0 );
71    }
72    else
73    {
74
75#if DEBUG_SYS_THREAD_EXIT
76uint64_t     tm_start = hal_get_cycles();
77if( DEBUG_SYS_THREAD_EXIT < tm_start )
78printk("\n[%s] thread[%x,%x] is not main => delete thread / cycle %d\n",
79__FUNCTION__ , pid , trdid , (uint32_t)tm_start );
80#endif
81        // block calling thread and mark it for delete,
82        thread_delete( XPTR( local_cxy , this ) , pid , false );
83
84        // deschedule
85        sched_yield( "suicide after thread_exit" );
86    }
87
88    return 0;   // never executed but required by compiler
89
90}  // end sys_thread exit
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