source: trunk/kernel/syscalls/sys_thread_detach.c @ 569

Last change on this file since 569 was 566, checked in by alain, 6 years ago

Complete restructuration of kernel locks.

File size: 2.5 KB
RevLine 
[1]1/*
[23]2 * sys_thread_detach.c - detach a joinable thread
[1]3 *
[23]4 * Authors   Alain Greiner (2016,2017)
5 *
[1]6 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
7 *
[23]8 * This file is part of ALMOS-MKH.
[1]9 *
[23]10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
[1]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 *
[23]14 * ALMOS-MKH is distributed in the hope that it will be useful, but
[1]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
[23]20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
[1]21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
[457]24#include <hal_kernel_types.h>
[23]25#include <hal_remote.h>
26#include <hal_special.h>
[1]27#include <thread.h>
28#include <errno.h>
[23]29#include <printk.h>
[1]30
[506]31#include <syscalls.h>
32
[23]33//////////////////////////////////////
34int sys_thread_detach( trdid_t trdid )
[1]35{
[23]36    xptr_t       target_xp;
37        thread_t   * target_ptr;
38    cxy_t        target_cxy;
39    ltid_t       target_ltid;
40    uint32_t     flags;
[1]41
[23]42        thread_t   * this    = CURRENT_THREAD;
43    process_t  * process = this->process;
[1]44
[23]45    // get target thread ltid and cxy
46    target_ltid = LTID_FROM_TRDID( trdid );
47    target_cxy  = CXY_FROM_TRDID( trdid );
[1]48
[23]49    // check trdid argument
[566]50        if( (target_ltid >= CONFIG_THREADS_MAX_PER_CLUSTER) || cluster_is_undefined( target_cxy ) ) 
[1]51        {
[23]52        printk("\n[ERROR] in %s : illegal trdid argument\n", __FUNCTION__ );
53                this->errno = EINVAL;
54                return -1;
[1]55        }
56
[23]57    // get extended pointer on target thread
58        target_xp  = thread_get_xptr( process->pid , trdid );
[1]59
[23]60    if( target_xp == XPTR_NULL )
61    {
62        printk("\n[ERROR] in %s : target thread not found\n", __FUNCTION__ );
63        this->errno = ESRCH;
64        return -1;
65    }
[1]66
[23]67    // get local pointer on target thread
68    target_ptr = (thread_t *)GET_PTR( target_xp );
[1]69
[23]70    // get target thread flags
[566]71    flags = hal_remote_l32( XPTR( target_cxy , &target_ptr->flags ) );
[1]72
[23]73    // check target thread joinable
74    if( flags & THREAD_FLAG_DETACHED )
75    {
76        printk("\n[ERROR] in %s : target thread not joinable\n", __FUNCTION__ );
77        this->errno = EINVAL; 
78        return -1;
79    }
80
81    // atomically set the thread DETACHED flag
82    hal_remote_atomic_or( XPTR( target_cxy , &target_ptr->flags ) , THREAD_FLAG_DETACHED );
83
84        return 0;
85
86}  // end sys_thread_detach()
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