source: trunk/kernel/syscalls/sys_thread_exit.c @ 490

Last change on this file since 490 was 457, checked in by alain, 6 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: 3.5 KB
RevLine 
[1]1/*
[409]2 * sys_thread_exit.c - terminates the execution of calling thread
[1]3 *
[440]4 * Authors   Alain Greiner (2016,2017,2018)
[1]5 *
[23]6 * Copyright (c) UPMC Sorbonne Universites
[1]7 *
[23]8 * This file is part of ALMOS-MKH.
9 *
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>
[440]25#include <hal_irqmask.h>
[1]26#include <thread.h>
[440]27#include <process.h>
[23]28#include <core.h>
[409]29#include <vmm.h>
[1]30#include <scheduler.h>
[23]31#include <printk.h>
[1]32
[23]33////////////////////////////////////////
34int sys_thread_exit( void * exit_value )
[1]35{
[440]36    reg_t       save_sr;    // required to enable IRQs
37    xptr_t      owner_xp;   // extended pointer on owner process
38 
39        thread_t  * this      = CURRENT_THREAD;
40    trdid_t     trdid     = this->trdid;
41    process_t * process   = this->process;
42    pid_t       pid       = process->pid;
43    cxy_t       owner_cxy = CXY_FROM_PID( pid );
[1]44
[436]45    // check exit_value argument
46    if( exit_value != NULL )
47    {
48
[438]49#if DEBUG_SYSCALLS_ERROR
[440]50printk("\n[ERROR] in %s : exit_value argument must be NULL / thread %x in process %x\n",
51__FUNCTION__ , this , pid );
[436]52#endif
[409]53        this->errno = EINVAL;
54        return -1;
55    }
[1]56
[438]57#if DEBUG_SYS_THREAD_EXIT
[436]58uint64_t     tm_start;
59uint64_t     tm_end;
60tm_start = hal_get_cycles();
[438]61if( DEBUG_SYS_THREAD_EXIT < tm_start )
[436]62printk("\n[DBG] %s : thread %x enter / process %x / cycle %d\n",
[440]63__FUNCTION__ , this, pid , (uint32_t)tm_start );
[436]64#endif
[1]65
[440]66    // If calling thread is the main thread, the process must be deleted.
67    // This require to delete all process threads and synchronise with parent process
68    if( (local_cxy == owner_cxy) && (LTID_FROM_TRDID(trdid) == 0) )
69    {
70        // get extended pointer on owner cluster
71        owner_xp = cluster_get_owner_process_from_pid( pid );
[1]72
[440]73        // mark for delete all threads but the main
74        hal_enable_irq( &save_sr );
75        process_sigaction( pid , DELETE_ALL_THREADS );
76        hal_restore_irq( save_sr );
77
78        // remove process from TXT list
79        process_txt_detach( owner_xp );
80
81        // block the main thread
82        thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_GLOBAL );
83
84        // atomically update owner process descriptor term_state to ask
85        // the parent process sys_wait() function to delete the main thread
86        hal_remote_atomic_or( XPTR( local_cxy , &process->term_state ) ,
87                              PROCESS_TERM_EXIT );
88    }
89    else
90    {
91        // block calling thread and mark it for delete,
92        thread_delete( XPTR( local_cxy , this ) , pid , false );
93    }
94
[438]95#if DEBUG_SYS_THREAD_EXIT
[409]96tm_end = hal_get_cycles();
[438]97if( DEBUG_SYS_THREAD_EXIT < tm_end )
[436]98printk("\n[DBG] %s : thread %x exit / process %x / cost %d / cycle %d\n",
[440]99__FUNCTION__, this, pid, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end );
[409]100#endif
101
[440]102    // deschedule <=> suicide, because blocked by thread_delete()
[436]103    sched_yield( "suicide after thread_exit" );
104   
[409]105    return 0;   // never executed but required by compiler
106
107}  // end sys_thread exit
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