source: trunk/kernel/syscalls/sys_thread_exit.c @ 457

Last change on this file since 457 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: 3.5 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////////////////////////////////////////
34int sys_thread_exit( void * exit_value )
35{
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 );
44
45    // check exit_value argument
46    if( exit_value != NULL )
47    {
48
49#if DEBUG_SYSCALLS_ERROR
50printk("\n[ERROR] in %s : exit_value argument must be NULL / thread %x in process %x\n",
51__FUNCTION__ , this , pid );
52#endif
53        this->errno = EINVAL;
54        return -1;
55    }
56
57#if DEBUG_SYS_THREAD_EXIT
58uint64_t     tm_start;
59uint64_t     tm_end;
60tm_start = hal_get_cycles();
61if( DEBUG_SYS_THREAD_EXIT < tm_start )
62printk("\n[DBG] %s : thread %x enter / process %x / cycle %d\n",
63__FUNCTION__ , this, pid , (uint32_t)tm_start );
64#endif
65
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 );
72
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
95#if DEBUG_SYS_THREAD_EXIT
96tm_end = hal_get_cycles();
97if( DEBUG_SYS_THREAD_EXIT < tm_end )
98printk("\n[DBG] %s : thread %x exit / process %x / cost %d / cycle %d\n",
99__FUNCTION__, this, pid, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end );
100#endif
101
102    // deschedule <=> suicide, because blocked by thread_delete()
103    sched_yield( "suicide after thread_exit" );
104   
105    return 0;   // never executed but required by compiler
106
107}  // end sys_thread exit
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