| 1 | /*
|
|---|
| 2 | * sys_thread_exit.c - terminates the execution of calling thread
|
|---|
| 3 | *
|
|---|
| 4 | * Authors 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 <hal_kernel_types.h>
|
|---|
| 25 | #include <hal_irqmask.h>
|
|---|
| 26 | #include <thread.h>
|
|---|
| 27 | #include <process.h>
|
|---|
| 28 | #include <core.h>
|
|---|
| 29 | #include <vmm.h>
|
|---|
| 30 | #include <scheduler.h>
|
|---|
| 31 | #include <printk.h>
|
|---|
| 32 |
|
|---|
| 33 | #include <syscalls.h>
|
|---|
| 34 |
|
|---|
| 35 | ////////////////////////////////////////
|
|---|
| 36 | int sys_thread_exit( void * exit_value )
|
|---|
| 37 | {
|
|---|
| 38 | thread_t * this = CURRENT_THREAD;
|
|---|
| 39 | trdid_t trdid = this->trdid;
|
|---|
| 40 | process_t * process = this->process;
|
|---|
| 41 | pid_t pid = process->pid;
|
|---|
| 42 |
|
|---|
| 43 | // check exit_value argument
|
|---|
| 44 | if( exit_value != NULL )
|
|---|
| 45 | {
|
|---|
| 46 |
|
|---|
| 47 | #if DEBUG_SYSCALLS_ERROR
|
|---|
| 48 | printk("\n[ERROR] in %s : exit_value argument must be NULL / thread %x in process %x\n",
|
|---|
| 49 | __FUNCTION__ , this , pid );
|
|---|
| 50 | #endif
|
|---|
| 51 | this->errno = EINVAL;
|
|---|
| 52 | return -1;
|
|---|
| 53 | }
|
|---|
| 54 |
|
|---|
| 55 |
|
|---|
| 56 | // If calling thread is the main thread, the process must be deleted.
|
|---|
| 57 | // => delete all process threads and synchronise with parent process.
|
|---|
| 58 | // If calling thread is not the main thread, it must be deleted.
|
|---|
| 59 | // => block the thread and mark it for delete.
|
|---|
| 60 | if( (CXY_FROM_PID( pid ) == local_cxy) && (LTID_FROM_TRDID(trdid) == 0) )
|
|---|
| 61 | {
|
|---|
| 62 |
|
|---|
| 63 | #if DEBUG_SYS_THREAD_EXIT
|
|---|
| 64 | uint64_t tm_start = hal_get_cycles();
|
|---|
| 65 | if( DEBUG_SYS_THREAD_EXIT < tm_start )
|
|---|
| 66 | printk("\n[DBG] %s : thread[%x,%x] / main => delete process / cycle %d\n",
|
|---|
| 67 | __FUNCTION__ , pid , trdid , (uint32_t)tm_start );
|
|---|
| 68 | #endif
|
|---|
| 69 | // delete process
|
|---|
| 70 | sys_exit( 0 );
|
|---|
| 71 | }
|
|---|
| 72 | else
|
|---|
| 73 | {
|
|---|
| 74 |
|
|---|
| 75 | #if DEBUG_SYS_THREAD_EXIT
|
|---|
| 76 | uint64_t tm_start = hal_get_cycles();
|
|---|
| 77 | if( DEBUG_SYS_THREAD_EXIT < tm_start )
|
|---|
| 78 | printk("\n[DBG] %s : thread[%x,%x] / not main => delete thread / cycle %d\n",
|
|---|
| 79 | __FUNCTION__ , pid , trdid , (uint32_t)tm_start );
|
|---|
| 80 | #endif
|
|---|
| 81 | // block calling thread and mark it for delete,
|
|---|
| 82 | thread_delete( XPTR( local_cxy , this ) , pid , false );
|
|---|
| 83 |
|
|---|
| 84 | // deschedule
|
|---|
| 85 | sched_yield( "suicide after thread_exit" );
|
|---|
| 86 | }
|
|---|
| 87 |
|
|---|
| 88 | return 0; // never executed but required by compiler
|
|---|
| 89 |
|
|---|
| 90 | } // end sys_thread exit
|
|---|
