source: trunk/kernel/syscalls/sys_exit.c @ 459

Last change on this file since 459 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: 6.2 KB
Line 
1/*
2 * sys_exit.c - Kernel function implementing the "exit" system call.
3 *
4 * Author    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 <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///////////////////////////////
36int sys_exit( uint32_t status )
37{
38    reg_t       save_sr;           // required to enable IRQs
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    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
52    thread_t  * this    = CURRENT_THREAD;
53    process_t * process = this->process;
54    pid_t       pid     = process->pid;
55
56#if DEBUG_SYS_EXIT
57uint64_t    tm_start;
58uint64_t    tm_end;
59tm_start = hal_get_cycles();
60if( DEBUG_SYS_EXIT < tm_start )
61printk("\n[DBG] %s : thread %x in process %x enter / status %x / cycle %d\n",
62__FUNCTION__, this->trdid, process->pid , 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#if (DEBUG_SYS_EXIT & 1)
71if( DEBUG_SYS_EXIT < tm_start )
72printk("\n[DBG] %s : thread %x in process %x get owner process %x in cluster %x\n",
73__FUNCTION__, this->trdid, process->pid, owner_ptr, owner_cxy );
74#endif
75
76    // get local pointer on the process main thread
77    main_ptr  = hal_remote_lpt( XPTR( owner_cxy , &owner_ptr->th_tbl[0] ) );
78
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 in process %x get parent process %x in cluster %x\n",
87__FUNCTION__, this->trdid, process->pid, 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( DEBUG_SYS_EXIT < tm_start )
102printk("\n[DBG] %s : thread %x in process %x detached process from TXT\n",
103__FUNCTION__, this->trdid, process->pid );
104#endif
105
106    // mark for delete all process threads in all clusters,
107    // but the main thread and this calling thread
108    hal_enable_irq( &save_sr );
109    process_sigaction( process->pid , DELETE_ALL_THREADS );
110    hal_restore_irq( save_sr );
111
112#if( DEBUG_SYS_EXIT & 1)
113if( DEBUG_SYS_EXIT < tm_start )
114printk("\n[DBG] %s : thread %x in process %x deleted all threads but itself\n",
115__FUNCTION__, this->trdid, process->pid );
116#endif
117
118    // mark for delete this calling thread when it is not the main
119    if( (owner_cxy != local_cxy) || (main_ptr != this) )
120    {
121
122#if( DEBUG_SYS_EXIT & 1)
123if( tm_start > DEBUG_SYS_EXIT )
124printk("\n[DBG] %s : thread %x in process %x marked iself for delete\n",
125__FUNCTION__, this->trdid, process->pid );
126#endif
127        thread_delete( XPTR( local_cxy , this ) , pid , true );
128    }
129
130    // block this main thread
131    thread_block( XPTR( owner_cxy , main_ptr ) , THREAD_BLOCKED_GLOBAL );
132
133#if( DEBUG_SYS_EXIT & 1)
134if( tm_start > DEBUG_SYS_EXIT )
135printk("\n[DBG] %s : thread %x in process %x blocked main thread\n",
136__FUNCTION__, this->trdid, process->pid );
137#endif
138
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 );
143
144#if( DEBUG_SYS_EXIT & 1)
145if( tm_start > DEBUG_SYS_EXIT )
146printk("\n[DBG] %s : thread %x in process %x set exit status %x in owner process\n",
147__FUNCTION__, this->trdid, process->pid, term_state );
148#endif
149
150    // 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 );
154
155#if( DEBUG_SYS_EXIT & 1)
156if( tm_start > DEBUG_SYS_EXIT )
157printk("\n[DBG] %s : thread %x in process %x unblock parent main thread in process %x\n",
158__FUNCTION__ , this->trdid, process->pid,
159hal_remote_lw( XPTR( parent_cxy , &parent_ptr->pid) ) );
160#endif
161
162    hal_fence();
163
164#if DEBUG_SYS_EXIT
165tm_end = hal_get_cycles();
166if( DEBUG_SYS_EXIT < tm_end )
167printk("\n[DBG] %s : thread %x in process %x exit / status %x / cost = %d / cycle %d\n",
168__FUNCTION__, this->trdid, process->pid, status,
169(uint32_t)(tm_end - tm_start), (uint32_t)tm_end );
170#endif
171
172    // this thread deschedule
173    sched_yield( "process exit" );
174
175        return 0;
176
177}  // end sys_exit()
178
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