source: trunk/kernel/syscalls/sys_thread_yield.c @ 508

Last change on this file since 508 was 506, checked in by viala@…, 6 years ago

[syscalls] add interface in implementation.

Add const where possible, fix protoypes to follow interface.

File size: 1.6 KB
RevLine 
[1]1/*
[23]2 * sys_thread_yield.c - calls the scheduler to yield
[1]3 *
[421]4 * Authors       Alain Greiner (2016,2017)
[23]5 *
[1]6 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
7 *
[23]8 * This file is part of ALMOS-MKH.
[1]9 *
[23]10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
[1]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 *
[23]14 * ALMOS-MKH is distributed in the hope that it will be useful, but
[1]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
[23]20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
[1]21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
[457]24#include <hal_kernel_types.h>
[445]25#include <hal_special.h>
[1]26#include <scheduler.h>
[445]27#include <thread.h>
[1]28
[506]29#include <syscalls.h>
30
[479]31int sys_thread_yield( void )
[1]32{
[445]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 deschedule / process %x / cycle %d\n",
40__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, (uint32_t)tm_start );
41#endif
42
43    // deschedule
[408]44        sched_yield("user request"); 
[445]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 resume / process %x / cycle %d\n",
50__FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, (uint32_t)tm_end );
51#endif
52
[23]53        return 0;
[1]54}
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