forked from Mirrorlandia_minetest/minetest
91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
/*
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Minetest
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Copyright (C) 2013 sapier, < sapier AT gmx DOT net >
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <assert.h>
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#include <errno.h>
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#include <sys/time.h>
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#include "jthread/jsemaphore.h"
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#define UNUSED(expr) do { (void)(expr); } while (0)
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JSemaphore::JSemaphore() {
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int sem_init_retval = sem_init(&m_semaphore,0,0);
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assert(sem_init_retval == 0);
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UNUSED(sem_init_retval);
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}
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JSemaphore::~JSemaphore() {
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int sem_destroy_retval = sem_destroy(&m_semaphore);
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assert(sem_destroy_retval == 0);
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UNUSED(sem_destroy_retval);
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}
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JSemaphore::JSemaphore(int initval) {
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int sem_init_retval = sem_init(&m_semaphore,0,initval);
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assert(sem_init_retval == 0);
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UNUSED(sem_init_retval);
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}
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void JSemaphore::Post() {
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int sem_post_retval = sem_post(&m_semaphore);
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assert(sem_post_retval == 0);
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UNUSED(sem_post_retval);
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}
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void JSemaphore::Wait() {
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int sem_wait_retval = sem_wait(&m_semaphore);
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assert(sem_wait_retval == 0);
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UNUSED(sem_wait_retval);
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}
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bool JSemaphore::Wait(unsigned int time_ms) {
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struct timespec waittime;
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struct timeval now;
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if (gettimeofday(&now, NULL) == -1) {
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assert("Unable to get time by clock_gettime!" == 0);
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return false;
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}
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waittime.tv_nsec = ((time_ms % 1000) * 1000 * 1000) + (now.tv_usec * 1000);
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waittime.tv_sec = (time_ms / 1000) + (waittime.tv_nsec / (1000*1000*1000)) + now.tv_sec;
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waittime.tv_nsec %= 1000*1000*1000;
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errno = 0;
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int sem_wait_retval = sem_timedwait(&m_semaphore,&waittime);
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if (sem_wait_retval == 0)
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{
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return true;
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}
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else {
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assert((errno == ETIMEDOUT) || (errno == EINTR));
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return false;
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}
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return sem_wait_retval == 0 ? true : false;
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}
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int JSemaphore::GetValue() {
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int retval = 0;
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sem_getvalue(&m_semaphore,&retval);
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return retval;
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}
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