mirror of
https://github.com/minetest/minetest.git
synced 2024-11-27 18:13:46 +01:00
168 lines
3.7 KiB
C++
168 lines
3.7 KiB
C++
/*
|
|
Minetest
|
|
Copyright (C) 2013 sapier <sapier AT gmx DOT net>
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License along
|
|
with this program; if not, write to the Free Software Foundation, Inc.,
|
|
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "threading/semaphore.h"
|
|
|
|
#include <iostream>
|
|
#include <cstdlib>
|
|
#include <cassert>
|
|
|
|
#define UNUSED(expr) do { (void)(expr); } while (0)
|
|
|
|
#ifdef _WIN32
|
|
#include <climits>
|
|
#define MAX_SEMAPHORE_COUNT LONG_MAX - 1
|
|
#else
|
|
#include <cerrno>
|
|
#include <sys/time.h>
|
|
#include <pthread.h>
|
|
#if defined(__MACH__) && defined(__APPLE__)
|
|
#include <mach/mach.h>
|
|
#include <mach/task.h>
|
|
#include <mach/semaphore.h>
|
|
#include <sys/semaphore.h>
|
|
#include <unistd.h>
|
|
|
|
#undef sem_t
|
|
#undef sem_init
|
|
#undef sem_wait
|
|
#undef sem_post
|
|
#undef sem_destroy
|
|
#define sem_t semaphore_t
|
|
#define sem_init(s, p, c) semaphore_create(mach_task_self(), (s), 0, (c))
|
|
#define sem_wait(s) semaphore_wait(*(s))
|
|
#define sem_post(s) semaphore_signal(*(s))
|
|
#define sem_destroy(s) semaphore_destroy(mach_task_self(), *(s))
|
|
#endif
|
|
#endif
|
|
|
|
|
|
Semaphore::Semaphore(int val)
|
|
{
|
|
#ifdef _WIN32
|
|
semaphore = CreateSemaphore(NULL, val, MAX_SEMAPHORE_COUNT, NULL);
|
|
#else
|
|
int ret = sem_init(&semaphore, 0, val);
|
|
assert(!ret);
|
|
UNUSED(ret);
|
|
#endif
|
|
}
|
|
|
|
|
|
Semaphore::~Semaphore()
|
|
{
|
|
#ifdef _WIN32
|
|
CloseHandle(semaphore);
|
|
#else
|
|
int ret = sem_destroy(&semaphore);
|
|
#ifdef __ANDROID__
|
|
// Workaround for broken bionic semaphore implementation!
|
|
assert(!ret || errno == EBUSY);
|
|
#else
|
|
assert(!ret);
|
|
#endif
|
|
UNUSED(ret);
|
|
#endif
|
|
}
|
|
|
|
|
|
void Semaphore::post(unsigned int num)
|
|
{
|
|
assert(num > 0);
|
|
#ifdef _WIN32
|
|
ReleaseSemaphore(semaphore, num, NULL);
|
|
#else
|
|
for (unsigned i = 0; i < num; i++) {
|
|
int ret = sem_post(&semaphore);
|
|
assert(!ret);
|
|
UNUSED(ret);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
void Semaphore::wait()
|
|
{
|
|
#ifdef _WIN32
|
|
WaitForSingleObject(semaphore, INFINITE);
|
|
#else
|
|
int ret = sem_wait(&semaphore);
|
|
assert(!ret);
|
|
UNUSED(ret);
|
|
#endif
|
|
}
|
|
|
|
|
|
bool Semaphore::wait(unsigned int time_ms)
|
|
{
|
|
#ifdef _WIN32
|
|
unsigned int ret = WaitForSingleObject(semaphore, time_ms);
|
|
|
|
if (ret == WAIT_OBJECT_0) {
|
|
return true;
|
|
} else {
|
|
assert(ret == WAIT_TIMEOUT);
|
|
return false;
|
|
}
|
|
#else
|
|
# if defined(__MACH__) && defined(__APPLE__)
|
|
mach_timespec_t wait_time;
|
|
wait_time.tv_sec = time_ms / 1000;
|
|
wait_time.tv_nsec = 1000000 * (time_ms % 1000);
|
|
|
|
errno = 0;
|
|
int ret = semaphore_timedwait(semaphore, wait_time);
|
|
switch (ret) {
|
|
case KERN_OPERATION_TIMED_OUT:
|
|
errno = ETIMEDOUT;
|
|
break;
|
|
case KERN_ABORTED:
|
|
errno = EINTR;
|
|
break;
|
|
default:
|
|
if (ret)
|
|
errno = EINVAL;
|
|
}
|
|
# else
|
|
int ret;
|
|
if (time_ms > 0) {
|
|
struct timespec wait_time;
|
|
struct timeval now;
|
|
|
|
if (gettimeofday(&now, NULL) == -1) {
|
|
std::cerr << "Semaphore::wait(ms): Unable to get time with gettimeofday!" << std::endl;
|
|
abort();
|
|
}
|
|
|
|
wait_time.tv_nsec = ((time_ms % 1000) * 1000 * 1000) + (now.tv_usec * 1000);
|
|
wait_time.tv_sec = (time_ms / 1000) + (wait_time.tv_nsec / (1000 * 1000 * 1000)) + now.tv_sec;
|
|
wait_time.tv_nsec %= 1000 * 1000 * 1000;
|
|
|
|
ret = sem_timedwait(&semaphore, &wait_time);
|
|
} else {
|
|
ret = sem_trywait(&semaphore);
|
|
}
|
|
# endif
|
|
|
|
assert(!ret || (errno == ETIMEDOUT || errno == EINTR || errno == EAGAIN));
|
|
return !ret;
|
|
#endif
|
|
}
|
|
|