source: trunk/kernel/syscalls/sys_exit.c @ 435

Last change on this file since 435 was 435, checked in by alain, 4 years ago

Fix a bad bug in scheduler...

File size: 3.0 KB
Line 
1/*
2 * sys_exit.c - Kernel function implementing the "exit" system call.
3 *
4 * Author    Alain Greiner (2016,2017)
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 CONFIG_DEBUG_SYS_EXIT
45uint64_t    tm_start;
46uint64_t    tm_end;
47tm_start = hal_get_cycles();
48if( CONFIG_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 cluster
54    cxy_t  owner_cxy = CXY_FROM_PID( pid );
55
56    // exit must be called by the main thread
57    if( (owner_cxy != local_cxy) || (LTID_FROM_TRDID( this->trdid ) != 0) )
58    {
59
60#if CONFIG_DEBUG_SYSCALLS_ERROR
61printk("\n[ERROR] %s must be called by thread 0 in process owner cluster\n"
62       "         trdid = %x / pid = %x / local_cxy = %x\n",
63__FUNCTION__, this->trdid, pid, local_cxy );
64#endif
65         this->errno = EINVAL;
66         return -1;
67    }
68
69    // enable IRQs
70    hal_enable_irq( &save_sr );
71
72    // register exit_status in owner process descriptor
73    process->term_state = status;
74
75    // remove TXT ownership from owner process descriptor
76    process_txt_reset_ownership( XPTR( local_cxy , process ) );
77
78    // block all process threads in all clusters
79    process_sigaction( pid , BLOCK_ALL_THREADS );
80
81    // mark all process threads in all clusters for delete
82    process_sigaction( pid , DELETE_ALL_THREADS );
83
84    // restore IRQs
85    hal_restore_irq( save_sr );
86
87    // atomically update owner process descriptor term_state
88    hal_remote_atomic_or( XPTR( local_cxy , &process->term_state ) ,
89                          PROCESS_TERM_EXIT );
90    hal_fence();
91
92#if CONFIG_DEBUG_SYS_EXIT
93tm_end = hal_get_cycles();
94if( CONFIG_DEBUG_SYS_EXIT < tm_end )
95printk("\n[DBG] %s : thread %x exit / process %x / status %x / cost = %d / cycle %d\n",
96__FUNCTION__, this, pid, status, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end );
97#endif
98
99        return 0;
100
101}  // end sys_exit()
102
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