mirror of https://github.com/minetest/minetest.git
157 lines
4.2 KiB
C++
157 lines
4.2 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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#if defined(__MACH__) && defined(__APPLE__)
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#include <unistd.h>
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#endif
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#define UNUSED(expr) do { (void)(expr); } while (0)
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#if defined(__MACH__) && defined(__APPLE__)
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#undef sem_t
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#undef sem_init
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#undef sem_wait
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#undef sem_post
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#undef sem_destroy
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#define sem_t semaphore_t
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#define sem_init(s, p, c) semaphore_create(mach_task_self(), (s), 0, (c))
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#define sem_wait(s) semaphore_wait(*(s))
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#define sem_post(s) semaphore_signal(*(s))
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#define sem_destroy(s) semaphore_destroy(mach_task_self(), *(s))
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pthread_mutex_t semcount_mutex;
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#endif
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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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#if defined(__MACH__) && defined(__APPLE__)
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semcount = 0;
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#endif
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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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#ifdef __ANDROID__
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// WORKAROUND for broken bionic semaphore implementation!
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assert(
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(sem_destroy_retval == 0) ||
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(errno == EBUSY)
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);
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#else
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assert(sem_destroy_retval == 0);
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#endif
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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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#if defined(__MACH__) && defined(__APPLE__)
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pthread_mutex_lock(&semcount_mutex);
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semcount++;
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pthread_mutex_unlock(&semcount_mutex);
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#endif
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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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#if defined(__MACH__) && defined(__APPLE__)
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pthread_mutex_lock(&semcount_mutex);
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semcount--;
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pthread_mutex_unlock(&semcount_mutex);
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#endif
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}
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bool JSemaphore::Wait(unsigned int time_ms) {
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#if defined(__MACH__) && defined(__APPLE__)
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mach_timespec_t waittime;
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waittime.tv_sec = time_ms / 1000;
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waittime.tv_nsec = 1000000 * (time_ms % 1000);
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#else
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struct timespec waittime;
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#endif
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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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#if !(defined(__MACH__) && defined(__APPLE__))
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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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#endif
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errno = 0;
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#if defined(__MACH__) && defined(__APPLE__)
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int sem_wait_retval = semaphore_timedwait(m_semaphore, waittime);
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if (sem_wait_retval == KERN_OPERATION_TIMED_OUT) {
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errno = ETIMEDOUT;
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} else if (sem_wait_retval == KERN_ABORTED) {
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errno = EINTR;
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} else if (sem_wait_retval != 0) {
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errno = EINVAL;
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}
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#else
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int sem_wait_retval = sem_timedwait(&m_semaphore, &waittime);
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#endif
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if (sem_wait_retval == 0)
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{
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#if defined(__MACH__) && defined(__APPLE__)
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pthread_mutex_lock(&semcount_mutex);
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semcount--;
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pthread_mutex_unlock(&semcount_mutex);
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#endif
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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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#if defined(__MACH__) && defined(__APPLE__)
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pthread_mutex_lock(&semcount_mutex);
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retval = semcount;
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pthread_mutex_unlock(&semcount_mutex);
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#else
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sem_getvalue(&m_semaphore, &retval);
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#endif
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return retval;
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}
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