source: trunk/kernel/syscalls/sys_exit.c @ 445

Last change on this file since 445 was 445, checked in by alain, 6 years ago

Restructure the mini_libc.

File size: 4.0 KB
RevLine 
[410]1/*
[416]2 * sys_exit.c - Kernel function implementing the "exit" system call.
[410]3 *
[440]4 * Author    Alain Greiner (2016,2017,2018)
[410]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 <kernel_config.h>
25#include <hal_types.h>
26#include <hal_irqmask.h>
27#include <errno.h>
28#include <thread.h>
29#include <printk.h>
30#include <process.h>
[435]31#include <shared_syscalls.h>
[410]32#include <cluster.h>
33#include <rpc.h>
34
35///////////////////////////////
36int sys_exit( uint32_t status )
37{
[433]38    reg_t       save_sr;       // required to enable IRQs
[410]39
[433]40    thread_t  * this    = CURRENT_THREAD;
41    process_t * process = this->process;
42    pid_t       pid     = process->pid;
[416]43
[438]44#if DEBUG_SYS_EXIT
[410]45uint64_t    tm_start;
46uint64_t    tm_end;
47tm_start = hal_get_cycles();
[438]48if( DEBUG_SYS_EXIT < tm_start )
[433]49printk("\n[DBG] %s : thread %x enter / process %x / status %x / cycle %d\n",
50__FUNCTION__ , this, pid , status , (uint32_t)tm_start );
[410]51#endif
52
[443]53    // get owner process descriptor pointers
54    xptr_t      owner_xp  = process->owner_xp;
[440]55    cxy_t       owner_cxy = GET_CXY( owner_xp );
56    process_t * owner_ptr = GET_PTR( owner_xp );
[410]57
[440]58    // get pointers on the process main thread
59    thread_t * main    = hal_remote_lpt( XPTR( owner_cxy , &owner_ptr->th_tbl[0] ) );
[433]60
[410]61    // enable IRQs
62    hal_enable_irq( &save_sr );
63
[443]64    // mark for delete all process threads in all clusters,
65    // but the main thread and this calling thread
[440]66    process_sigaction( pid , DELETE_ALL_THREADS );
[410]67
[440]68    // disable IRQs
69    hal_restore_irq( save_sr );
70
[438]71#if( DEBUG_SYS_EXIT & 1)
[440]72if( tm_start > DEBUG_SYS_EXIT )
73printk("\n[DBG] %s : thread %x deleted threads / process %x\n",
74__FUNCTION__ , this, pid );
[436]75#endif
[435]76
[440]77    // mark for delete this calling thread when it is not the main
78    if( (owner_cxy != local_cxy) || (main != this) )
79    {
[435]80
[438]81#if( DEBUG_SYS_EXIT & 1)
[440]82if( tm_start > DEBUG_SYS_EXIT )
[443]83printk("\n[DBG] %s : calling thread %x marked iself for delete / process %x\n",
[440]84__FUNCTION__ , this, pid );
[436]85#endif
[440]86        thread_delete( XPTR( local_cxy , this ) , pid , true );
87    }
[445]88
[440]89    // remove process from TXT list
90    process_txt_detach( owner_xp );
[436]91
[438]92#if( DEBUG_SYS_EXIT & 1)
[440]93if( tm_start > DEBUG_SYS_EXIT )
94printk("\n[DBG] %s : thread %x removed process %x from TXT list\n",
95__FUNCTION__ , this, pid );
[436]96#endif
97
[440]98    // block the main thread
99    thread_block( XPTR( owner_cxy , main ) , THREAD_BLOCKED_GLOBAL );
[410]100
[438]101#if( DEBUG_SYS_EXIT & 1)
[440]102if( tm_start > DEBUG_SYS_EXIT )
103printk("\n[DBG] %s : thread %x blocked main thread for process %x\n",
104__FUNCTION__, this , pid );
[436]105#endif
106
107    // atomically update owner process descriptor term_state to ask
[440]108    // the parent process sys_wait() function to delete the main thread
109    hal_remote_atomic_or( XPTR( owner_cxy , &process->term_state ) ,
110                          PROCESS_TERM_EXIT | (status & 0xFF) );
[436]111
[438]112#if( DEBUG_SYS_EXIT & 1)
[440]113if( tm_start > DEBUG_SYS_EXIT )
114printk("\n[DBG] %s : thread %x set exit status in process %x term_state\n",
115__FUNCTION__ , this, pid );
[436]116#endif
117
[410]118    hal_fence();
119
[438]120#if DEBUG_SYS_EXIT
[410]121tm_end = hal_get_cycles();
[438]122if( DEBUG_SYS_EXIT < tm_end )
[433]123printk("\n[DBG] %s : thread %x exit / process %x / status %x / cost = %d / cycle %d\n",
124__FUNCTION__, this, pid, status, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end );
[410]125#endif
126
[440]127    // this thread deschedule
[436]128    sched_yield( "process exit" );
129
[410]130        return 0;
131
132}  // end sys_exit()
133
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