source: trunk/kernel/syscalls/sys_thread_yield.c @ 566

Last change on this file since 566 was 566, checked in by alain, 3 years ago

Complete restructuration of kernel locks.

File size: 1.6 KB
Line 
1/*
2 * sys_thread_yield.c - calls the scheduler to yield
3 *
4 * Authors       Alain Greiner (2016,2017)
5 *
6 * Copyright (c) 2011,2012 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_special.h>
26#include <scheduler.h>
27#include <thread.h>
28
29#include <syscalls.h>
30
31int sys_thread_yield( void )
32{
33 
34#if DEBUG_SYS_THREAD_YIELD
35uint64_t     tm_start;
36uint64_t     tm_end;
37tm_start = hal_get_cycles();
38if( DEBUG_SYS_THREAD_YIELD < tm_start )
39printk("\n[DBG] %s : thread %x in process %x deschedule / cycle %d\n",
40__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, (uint32_t)tm_start );
41#endif
42
43    // deschedule
44        sched_yield("user request"); 
45
46#if DEBUG_SYS_THREAD_YIELD
47tm_end = hal_get_cycles();
48if( DEBUG_SYS_THREAD_YIELD < tm_start )
49printk("\n[DBG] %s : thread %x in process %x resume / cycle %d\n",
50__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, (uint32_t)tm_end );
51#endif
52
53        return 0;
54}
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