source: trunk/kernel/syscalls/sys_thread_detach.c @ 459

Last change on this file since 459 was 457, checked in by alain, 3 years ago

This version modifies the exec syscall and fixes a large number of small bugs.
The version number has been updated (0.1)

File size: 2.5 KB
Line 
1/*
2 * sys_thread_detach.c - detach a joinable thread
3 *
4 * Authors   Alain Greiner (2016,2017)
5 *
6 * Copyright (c) 2011,2012 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_remote.h>
26#include <hal_special.h>
27#include <thread.h>
28#include <errno.h>
29#include <printk.h>
30
31//////////////////////////////////////
32int sys_thread_detach( trdid_t trdid )
33{
34    xptr_t       target_xp;
35        thread_t   * target_ptr;
36    cxy_t        target_cxy;
37    ltid_t       target_ltid;
38    uint32_t     flags;
39
40        thread_t   * this    = CURRENT_THREAD;
41    process_t  * process = this->process;
42
43    // get target thread ltid and cxy
44    target_ltid = LTID_FROM_TRDID( trdid );
45    target_cxy  = CXY_FROM_TRDID( trdid );
46
47    // check trdid argument
48        if( (target_ltid >= CONFIG_THREAD_MAX_PER_CLUSTER) || cluster_is_undefined( target_cxy ) ) 
49        {
50        printk("\n[ERROR] in %s : illegal trdid argument\n", __FUNCTION__ );
51                this->errno = EINVAL;
52                return -1;
53        }
54
55    // get extended pointer on target thread
56        target_xp  = thread_get_xptr( process->pid , trdid );
57
58    if( target_xp == XPTR_NULL )
59    {
60        printk("\n[ERROR] in %s : target thread not found\n", __FUNCTION__ );
61        this->errno = ESRCH;
62        return -1;
63    }
64
65    // get local pointer on target thread
66    target_ptr = (thread_t *)GET_PTR( target_xp );
67
68    // get target thread flags
69    flags = hal_remote_lw( XPTR( target_cxy , &target_ptr->flags ) );
70
71    // check target thread joinable
72    if( flags & THREAD_FLAG_DETACHED )
73    {
74        printk("\n[ERROR] in %s : target thread not joinable\n", __FUNCTION__ );
75        this->errno = EINVAL; 
76        return -1;
77    }
78
79    // atomically set the thread DETACHED flag
80    hal_remote_atomic_or( XPTR( target_cxy , &target_ptr->flags ) , THREAD_FLAG_DETACHED );
81
82        return 0;
83
84}  // end sys_thread_detach()
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