source: trunk/kernel/syscalls/sys_exit.c @ 664

Last change on this file since 664 was 664, checked in by alain, 16 months ago
  • Introduce the sys_socket.c file implementing all socket related syscalls.
  • Improve the non-standard sys_get_config() function.
File size: 5.7 KB
Line 
1/*
2 * sys_exit.c - Kernel function implementing the "exit" system call.
3 *
4 * Author    Alain Greiner (2016,2017,2018,2019)
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_kernel_types.h>
26#include <hal_irqmask.h>
27#include <errno.h>
28#include <thread.h>
29#include <printk.h>
30#include <process.h>
31#include <shared_syscalls.h>
32#include <cluster.h>
33#include <rpc.h>
34
35#include <syscalls.h>
36
37///////////////////////////////
38int sys_exit( uint32_t status )
39{
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    thread_t  * parent_main_ptr;   // local pointer on parent main thread
48    xptr_t      parent_main_xp;    // extended pointer on parent main thread
49    uint32_t    term_state;        // termination status for owner process
50
51    thread_t  * this    = CURRENT_THREAD;
52    process_t * process = this->process;
53    pid_t       pid     = process->pid;
54
55#if (DEBUG_SYS_EXIT || CONFIG_INSTRUMENTATION_SYSCALLS)
56uint64_t     tm_start = hal_get_cycles();
57#endif
58
59#if DEBUG_SYS_EXIT
60if( DEBUG_SYS_EXIT < tm_start )
61printk("\n[%s] thread[%x,%x] enter / status %x / cycle %d\n",
62__FUNCTION__, pid, this->trdid , status , (uint32_t)tm_start );
63#endif
64
65    // get owner process descriptor pointers
66    owner_xp  = process->owner_xp;
67    owner_cxy = GET_CXY( owner_xp );
68    owner_ptr = GET_PTR( owner_xp );
69
70    // get local pointer on the main thread
71    main_ptr  = hal_remote_lpt( XPTR( owner_cxy , &owner_ptr->th_tbl[0] ) );
72
73    // get parent process descriptor pointers
74    parent_xp  = process->parent_xp;
75    parent_cxy = GET_CXY( parent_xp );
76    parent_ptr = GET_PTR( parent_xp );
77
78    // get pointers on the parent process main thread
79    parent_main_ptr = hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->th_tbl[0] ) ); 
80    parent_main_xp  = XPTR( parent_cxy , parent_main_ptr );
81
82    // remove process from TXT list
83    process_txt_detach( owner_xp );
84
85#if( DEBUG_SYS_EXIT & 1)
86if( DEBUG_SYS_EXIT < tm_start )
87printk("\n[%s] thread[%x,%x] detached process %x from TXT\n",
88__FUNCTION__, pid, this->trdid, pid );
89#endif
90
91    // close all open files
92    process_fd_clean_all( owner_xp );
93
94#if( DEBUG_SYS_EXIT & 1)
95if( DEBUG_SYS_EXIT < tm_start )
96printk("\n[%s] thread[%x,%x] closed all files for process %x\n",
97__FUNCTION__, pid, this->trdid, pid );
98#endif
99
100    // mark for delete all process threads in all clusters,
101    // but the main thread and this calling thread
102    process_sigaction( pid , DELETE_ALL_THREADS );
103
104#if( DEBUG_SYS_EXIT & 1)
105if( DEBUG_SYS_EXIT < tm_start )
106printk("\n[%s] thread[%x,%x] deleted all threads in process %x (but itself)\n",
107__FUNCTION__, pid, this->trdid, pid );
108#endif
109
110    // mark for delete the calling thread when it is not the main
111    if( (owner_cxy != local_cxy) || (main_ptr != this) )
112    {
113
114#if( DEBUG_SYS_EXIT & 1)
115if( tm_start > DEBUG_SYS_EXIT )
116printk("\n[%s] thread[%x,%x] marked iself for delete\n",
117__FUNCTION__, pid, this->trdid );
118#endif
119        thread_delete( XPTR( local_cxy , this ) , true );    // forced
120    }
121
122    // block the main thread
123    thread_block( XPTR( owner_cxy , main_ptr ) , THREAD_BLOCKED_GLOBAL );
124
125#if( DEBUG_SYS_EXIT & 1)
126trdid_t main_trdid = hal_remote_l32( XPTR( owner_cxy , &main_ptr->trdid ) );
127if( tm_start > DEBUG_SYS_EXIT )
128printk("\n[%s] thread[%x,%x] blocked main thread[%x,%x]\n",
129__FUNCTION__, pid, this->trdid, pid, main_trdid );
130#endif
131
132    // update term_state in owner process descriptor to ask
133    // the parent process sys_wait() function to delete the process
134    term_state = (status & 0xFF) | PROCESS_TERM_EXIT;
135    hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) , term_state );
136
137#if( DEBUG_SYS_EXIT & 1)
138if( tm_start > DEBUG_SYS_EXIT )
139printk("\n[%s] thread[%x,%x] set exit status %x in owner process\n",
140__FUNCTION__, pid, this->trdid, term_state );
141#endif
142
143    // unblock the parent process main thread
144    thread_unblock( parent_main_xp , THREAD_BLOCKED_WAIT );
145
146#if( DEBUG_SYS_EXIT & 1)
147if( tm_start > DEBUG_SYS_EXIT )
148printk("\n[%s] thread[%x,%x] unblocked parent main thread in process %x\n",
149__FUNCTION__ , pid, this->trdid,
150hal_remote_l32( XPTR( parent_cxy , &parent_ptr->pid) ) );
151#endif
152
153    hal_fence();
154
155#if (DEBUG_SYS_EXIT || CONFIG_INSTRUMENTATION_SYSCALLS)
156uint64_t     tm_end = hal_get_cycles();
157#endif
158
159#if DEBUG_SYS_EXIT
160if( DEBUG_SYS_EXIT < tm_end )
161printk("\n[%s] thread[%x,%x] exit / term_state %x / cycle %d\n",
162__FUNCTION__, pid, this->trdid, term_state,  (uint32_t)tm_end );
163#endif
164
165#if CONFIG_INSTRUMENTATION_SYSCALLS
166hal_atomic_add( &syscalls_cumul_cost[SYS_EXIT] , tm_end - tm_start );
167hal_atomic_add( &syscalls_occurences[SYS_EXIT] , 1 );
168#endif
169
170    // this thread deschedule
171    sched_yield( "process exit" );
172
173        return 0;
174
175}  // end sys_exit()
176
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