source: trunk/kernel/syscalls/sys_exit.c @ 441

Last change on this file since 441 was 441, checked in by alain, 4 years ago

Fix a bug in rpc_vmm_get_pte_client() function (bad RPC index).

File size: 4.0 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_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    thread_t  * this    = CURRENT_THREAD;
41    process_t * process = this->process;
42    pid_t       pid     = process->pid;
43
44#if DEBUG_SYS_EXIT
45uint64_t    tm_start;
46uint64_t    tm_end;
47tm_start = hal_get_cycles();
48if( DEBUG_SYS_EXIT < tm_start )
49printk("\n[DBG] %s : thread %x enter / process %x / status %x / cycle %d\n",
50__FUNCTION__ , this, pid , status , (uint32_t)tm_start );
51#endif
52
53    // get owner process descriptor pointers and cluster
54    xptr_t      owner_xp  = cluster_get_owner_process_from_pid( pid );
55    cxy_t       owner_cxy = GET_CXY( owner_xp );
56    process_t * owner_ptr = GET_PTR( owner_xp );
57
58    // get pointers on the process main thread
59    thread_t * main    = hal_remote_lpt( XPTR( owner_cxy , &owner_ptr->th_tbl[0] ) );
60
61    // enable IRQs
62    hal_enable_irq( &save_sr );
63
64    // mark for delete all process threads in all clusters
65    // (but the main thread and this calling thread)
66    process_sigaction( pid , DELETE_ALL_THREADS );
67
68    // disable IRQs
69    hal_restore_irq( save_sr );
70
71#if( DEBUG_SYS_EXIT & 1)
72if( tm_start > DEBUG_SYS_EXIT )
73printk("\n[DBG] %s : thread %x deleted threads / process %x\n",
74__FUNCTION__ , this, pid );
75#endif
76
77    // mark for delete this calling thread when it is not the main
78    if( (owner_cxy != local_cxy) || (main != this) )
79    {
80
81#if( DEBUG_SYS_EXIT & 1)
82if( tm_start > DEBUG_SYS_EXIT )
83printk("\n[DBG] %s : calling thread %x deleted itself / process %x\n",
84__FUNCTION__ , this, pid );
85#endif
86        thread_delete( XPTR( local_cxy , this ) , pid , true );
87    }
88         
89    // remove process from TXT list
90    process_txt_detach( owner_xp );
91
92#if( DEBUG_SYS_EXIT & 1)
93if( tm_start > DEBUG_SYS_EXIT )
94printk("\n[DBG] %s : thread %x removed process %x from TXT list\n",
95__FUNCTION__ , this, pid );
96#endif
97
98    // block the main thread
99    thread_block( XPTR( owner_cxy , main ) , THREAD_BLOCKED_GLOBAL );
100
101#if( DEBUG_SYS_EXIT & 1)
102if( tm_start > DEBUG_SYS_EXIT )
103printk("\n[DBG] %s : thread %x blocked main thread for process %x\n",
104__FUNCTION__, this , pid );
105#endif
106
107    // atomically update owner process descriptor term_state to ask
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) );
111
112#if( DEBUG_SYS_EXIT & 1)
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 );
116#endif
117
118    hal_fence();
119
120#if DEBUG_SYS_EXIT
121tm_end = hal_get_cycles();
122if( DEBUG_SYS_EXIT < tm_end )
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 );
125#endif
126
127    // this thread deschedule
128    sched_yield( "process exit" );
129
130        return 0;
131
132}  // end sys_exit()
133
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