source: trunk/kernel/syscalls/sys_exit.c

Last change on this file was 670, checked in by alain, 2 weeks ago

1) Introduce up to 4 command lines arguments in the KSH "load" command.
These arguments are transfered to the user process through the
argc/argv mechanism, using the user space "args" vseg.

2) Introduce the named and anonymous "pipes", for inter-process communication
through the pipe() and mkfifo() syscalls.

3) Introduce the "chat" application to validate the two above mechanisms.

4) Improve printk() and assert() fonctions in printk.c.

File size: 6.0 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 <dev_fbf.h>
32#include <shared_syscalls.h>
33#include <cluster.h>
34#include <rpc.h>
35
36#include <syscalls.h>
37
38///////////////////////////////
39int sys_exit( uint32_t status )
40{
41    xptr_t      owner_xp;          // extended pointer on owner process
42    cxy_t       owner_cxy;         // owner process cluster
43    process_t * owner_ptr;         // local pointer on owner process
44    thread_t  * main_ptr;          // local pointer on process main thread
45    xptr_t      parent_xp;         // extended pointer on parent process
46    cxy_t       parent_cxy;        // parent process cluster
47    process_t * parent_ptr;        // local pointer on parent process
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
52    thread_t  * this    = CURRENT_THREAD;
53    process_t * process = this->process;
54    pid_t       pid     = process->pid;
55
56#if (DEBUG_SYS_EXIT || CONFIG_INSTRUMENTATION_SYSCALLS)
57uint64_t     tm_start = hal_get_cycles();
58#endif
59
60#if DEBUG_SYS_EXIT
61if( DEBUG_SYS_EXIT < tm_start )
62printk("\n[%s] thread[%x,%x] enter / status %x / cycle %d\n",
63__FUNCTION__, pid, this->trdid , status , (uint32_t)tm_start );
64#endif
65
66    // get owner process descriptor pointers
67    owner_xp  = process->owner_xp;
68    owner_cxy = GET_CXY( owner_xp );
69    owner_ptr = GET_PTR( owner_xp );
70
71    // get local pointer on the main thread
72    main_ptr  = hal_remote_lpt( XPTR( owner_cxy , &owner_ptr->th_tbl[0] ) );
73
74    // get parent process descriptor pointers
75    parent_xp  = process->parent_xp;
76    parent_cxy = GET_CXY( parent_xp );
77    parent_ptr = GET_PTR( parent_xp );
78
79    // get pointers on the parent process main thread
80    parent_main_ptr = hal_remote_lpt( XPTR( parent_cxy , &parent_ptr->th_tbl[0] ) ); 
81    parent_main_xp  = XPTR( parent_cxy , parent_main_ptr );
82
83    // remove process from TXT list
84    process_txt_detach( owner_xp );
85
86#if( DEBUG_SYS_EXIT & 1)
87if( DEBUG_SYS_EXIT < tm_start )
88printk("\n[%s] thread[%x,%x] detached process %x from TXT\n",
89__FUNCTION__, pid, this->trdid, pid );
90#endif
91
92    // close all open files
93    process_fd_clean_all( owner_xp );
94
95#if( DEBUG_SYS_EXIT & 1)
96if( DEBUG_SYS_EXIT < tm_start )
97printk("\n[%s] thread[%x,%x] closed all files for process %x\n",
98__FUNCTION__, pid, this->trdid, pid );
99#endif
100
101    // delete all process registered FBF windows
102    dev_fbf_cleanup( pid );
103
104#if( DEBUG_SYS_EXIT & 1)
105if( DEBUG_SYS_EXIT < tm_start )
106printk("\n[%s] thread[%x,%x] deleted all FBF windows for process %x\n",
107__FUNCTION__, pid, this->trdid, pid );
108#endif
109
110    // mark for delete all process threads in all clusters,
111    // but the main thread and this calling thread
112    process_sigaction( pid , DELETE_ALL_THREADS );
113
114#if( DEBUG_SYS_EXIT & 1)
115if( DEBUG_SYS_EXIT < tm_start )
116printk("\n[%s] thread[%x,%x] deleted all threads in process %x (but itself)\n",
117__FUNCTION__, pid, this->trdid, pid );
118#endif
119
120    // mark for delete the calling thread when it is not the main
121    if( (owner_cxy != local_cxy) || (main_ptr != this) )
122    {
123
124#if( DEBUG_SYS_EXIT & 1)
125if( tm_start > DEBUG_SYS_EXIT )
126printk("\n[%s] thread[%x,%x] marked iself for delete\n",
127__FUNCTION__, pid, this->trdid );
128#endif
129        thread_delete_request( XPTR( local_cxy , this ) , true );    // forced
130    }
131
132    // block the main thread
133    thread_block( XPTR( owner_cxy , main_ptr ) , THREAD_BLOCKED_GLOBAL );
134
135#if( DEBUG_SYS_EXIT & 1)
136trdid_t main_trdid = hal_remote_l32( XPTR( owner_cxy , &main_ptr->trdid ) );
137if( tm_start > DEBUG_SYS_EXIT )
138printk("\n[%s] thread[%x,%x] blocked main thread[%x,%x]\n",
139__FUNCTION__, pid, this->trdid, pid, main_trdid );
140#endif
141
142    // update term_state in owner process descriptor to ask
143    // the parent process sys_wait() function to delete the process
144    term_state = (status & 0xFF) | PROCESS_TERM_EXIT;
145    hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) , term_state );
146
147#if( DEBUG_SYS_EXIT & 1)
148if( tm_start > DEBUG_SYS_EXIT )
149printk("\n[%s] thread[%x,%x] set exit status %x in owner process\n",
150__FUNCTION__, pid, this->trdid, term_state );
151#endif
152
153    // unblock the parent process main thread
154    thread_unblock( parent_main_xp , THREAD_BLOCKED_WAIT );
155
156#if( DEBUG_SYS_EXIT & 1)
157if( tm_start > DEBUG_SYS_EXIT )
158printk("\n[%s] thread[%x,%x] unblocked parent main thread in process %x\n",
159__FUNCTION__ , pid, this->trdid,
160hal_remote_l32( XPTR( parent_cxy , &parent_ptr->pid) ) );
161#endif
162
163    hal_fence();
164
165#if (DEBUG_SYS_EXIT || CONFIG_INSTRUMENTATION_SYSCALLS)
166uint64_t     tm_end = hal_get_cycles();
167#endif
168
169#if DEBUG_SYS_EXIT
170if( DEBUG_SYS_EXIT < tm_end )
171printk("\n[%s] thread[%x,%x] exit / term_state %x / cycle %d\n",
172__FUNCTION__, pid, this->trdid, term_state,  (uint32_t)tm_end );
173#endif
174
175#if CONFIG_INSTRUMENTATION_SYSCALLS
176hal_atomic_add( &syscalls_cumul_cost[SYS_EXIT] , tm_end - tm_start );
177hal_atomic_add( &syscalls_occurences[SYS_EXIT] , 1 );
178#endif
179
180    // this thread deschedule
181    sched_yield( "process exit" );
182
183        return 0;
184
185}  // end sys_exit()
186
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