source: trunk/kernel/syscalls/sys_exit.c @ 446

Last change on this file since 446 was 446, checked in by alain, 6 years ago

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File size: 6.0 KB
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[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{
[446]38    reg_t       save_sr;           // required to enable IRQs
[410]39
[446]40    xptr_t      owner_xp;          // extended pointer on owner process
41    cxy_t       owner_cxy;         // owner process cluster
42    process_t * owner_ptr;         // local pointer on owner process
43    thread_t  * main_ptr;          // local pointer on process main thread
44    xptr_t      parent_xp;         // extended pointer on parent process
45    cxy_t       parent_cxy;        // parent process cluster
46    process_t * parent_ptr;        // local pointer on parent process
47    xptr_t      children_lock_xp;  // extended pointer on children locki
48    thread_t  * parent_main_ptr;   // local pointer on parent main thread
49    xptr_t      parent_main_xp;    // extended pointer on parent main thread
50    uint32_t    term_state;        // termination status for owner process
51
[433]52    thread_t  * this    = CURRENT_THREAD;
53    process_t * process = this->process;
54    pid_t       pid     = process->pid;
[416]55
[438]56#if DEBUG_SYS_EXIT
[410]57uint64_t    tm_start;
58uint64_t    tm_end;
59tm_start = hal_get_cycles();
[438]60if( DEBUG_SYS_EXIT < tm_start )
[433]61printk("\n[DBG] %s : thread %x enter / process %x / status %x / cycle %d\n",
62__FUNCTION__ , this, pid , status , (uint32_t)tm_start );
[410]63#endif
64
[443]65    // get owner process descriptor pointers
[446]66    owner_xp  = process->owner_xp;
67    owner_cxy = GET_CXY( owner_xp );
68    owner_ptr = GET_PTR( owner_xp );
[410]69
[446]70#if (DEBUG_SYS_EXIT & 1)
71if( DEBUG_SYS_EXIT < tm_start )
72printk("\n[DBG] %s : thread %x get owner process %x in cluster %x\n",
73__FUNCTION__ , this, owner_ptr, owner_cxy );
74#endif
[433]75
[446]76    // get pointer on the process main thread
77    main_ptr  = hal_remote_lpt( XPTR( owner_cxy , &owner_ptr->th_tbl[0] ) );
[410]78
[446]79    // get parent process descriptor pointers
80    parent_xp  = process->parent_xp;
81    parent_cxy = GET_CXY( parent_xp );
82    parent_ptr = GET_PTR( parent_xp );
83
84#if (DEBUG_SYS_EXIT & 1)
85if( DEBUG_SYS_EXIT < tm_start )
86printk("\n[DBG] %s : thread %x get parent process %x in cluster %x\n",
87__FUNCTION__ , this, parent_ptr, parent_cxy );
88#endif
89
90    // get extended pointer on lock protecting children list in parent process
91    children_lock_xp = XPTR( parent_cxy , &parent_ptr->children_lock ); 
92
93    // get pointers on the parent process main thread
94    parent_main_ptr = hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->th_tbl[0] ) ); 
95    parent_main_xp  = XPTR( parent_cxy , parent_main_ptr );
96
97    // remove process from TXT list
98    process_txt_detach( owner_xp );
99
100#if( DEBUG_SYS_EXIT & 1)
101if( tm_start > DEBUG_SYS_EXIT )
102printk("\n[DBG] %s : thread %x removed process %x from TXT list\n",
103__FUNCTION__ , this, pid );
104#endif
105
[443]106    // mark for delete all process threads in all clusters,
107    // but the main thread and this calling thread
[446]108    hal_enable_irq( &save_sr );
[440]109    process_sigaction( pid , DELETE_ALL_THREADS );
110    hal_restore_irq( save_sr );
111
[438]112#if( DEBUG_SYS_EXIT & 1)
[440]113if( tm_start > DEBUG_SYS_EXIT )
[446]114printk("\n[DBG] %s : thread %x deleted threads for process %x\n",
[440]115__FUNCTION__ , this, pid );
[436]116#endif
[435]117
[440]118    // mark for delete this calling thread when it is not the main
[446]119    if( (owner_cxy != local_cxy) || (main_ptr != this) )
[440]120    {
[435]121
[438]122#if( DEBUG_SYS_EXIT & 1)
[440]123if( tm_start > DEBUG_SYS_EXIT )
[446]124printk("\n[DBG] %s : calling thread %x marked iself for delete in process %x\n",
[440]125__FUNCTION__ , this, pid );
[436]126#endif
[440]127        thread_delete( XPTR( local_cxy , this ) , pid , true );
128    }
[445]129
[446]130    // block this main thread
131    thread_block( XPTR( owner_cxy , main_ptr ) , THREAD_BLOCKED_GLOBAL );
[436]132
[438]133#if( DEBUG_SYS_EXIT & 1)
[440]134if( tm_start > DEBUG_SYS_EXIT )
[446]135printk("\n[DBG] %s : thread %x blocked main thread for process %x\n",
136__FUNCTION__, this , pid );
[436]137#endif
138
[446]139    // atomically update owner process descriptor term_state to ask
140    // the parent process sys_wait() function to delete the main thread
141    term_state = (status & 0xFF) | PROCESS_TERM_EXIT;
142    hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) , term_state );
[410]143
[438]144#if( DEBUG_SYS_EXIT & 1)
[440]145if( tm_start > DEBUG_SYS_EXIT )
[446]146printk("\n[DBG] %s : thread %x set exit status in process %x / term_state %x\n",
147__FUNCTION__ , this, pid, term_state );
[436]148#endif
149
[446]150    // take the children lock and unblock the parent process main thread
151    remote_spinlock_lock( children_lock_xp );
152    thread_unblock( parent_main_xp , THREAD_BLOCKED_WAIT );
153    remote_spinlock_unlock( children_lock_xp );
[436]154
[438]155#if( DEBUG_SYS_EXIT & 1)
[440]156if( tm_start > DEBUG_SYS_EXIT )
[446]157printk("\n[DBG] %s : thread %x in cluster %x unblock parent main thread %x in cluster %x\n",
158__FUNCTION__ , this, local_cxy, parent_main_ptr, parent_cxy );
[436]159#endif
160
[410]161    hal_fence();
162
[438]163#if DEBUG_SYS_EXIT
[410]164tm_end = hal_get_cycles();
[438]165if( DEBUG_SYS_EXIT < tm_end )
[433]166printk("\n[DBG] %s : thread %x exit / process %x / status %x / cost = %d / cycle %d\n",
167__FUNCTION__, this, pid, status, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end );
[410]168#endif
169
[440]170    // this thread deschedule
[436]171    sched_yield( "process exit" );
172
[410]173        return 0;
174
175}  // end sys_exit()
176
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