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#include "semaphore.h"
#include <hugin.hpp>
#include <limits>
#include <assert.h>
#include <string.h>
#ifdef WIN32
#include <windows.h>
#else
#include <../include/semaphore.h>
#include <errno.h>
#include <stdio.h>
#endif
struct semaphore_private_t {
#ifdef WIN32
HANDLE semaphore;
#else
sem_t semaphore;
#endif
};
Semaphore::Semaphore(std::size_t initial_count)
{
prv = new struct semaphore_private_t();
#ifdef WIN32
prv->semaphore = CreateSemaphore(nullptr,
initial_count,
std::numeric_limits<LONG>::max(),
nullptr);
#else
const int pshared = 0;
memset(&prv->semaphore, 0, sizeof(sem_t));
sem_init(&prv->semaphore, pshared, initial_count);
#endif
}
Semaphore::~Semaphore()
{
#ifdef WIN32
CloseHandle(prv->semaphore);
#else
sem_destroy(&prv->semaphore);
#endif
delete prv;
}
void Semaphore::post()
{
#ifdef WIN32
ReleaseSemaphore(prv->semaphore, 1, NULL);
#else
sem_post(&prv->semaphore);
#endif
}
bool Semaphore::wait(const std::chrono::milliseconds& timeout)
{
#ifdef WIN32
DWORD ret = WaitForSingleObject(prv->semaphore, timeout.count());
if(ret == WAIT_TIMEOUT)
{
return false;
}
assert(ret == WAIT_OBJECT_0);
#else
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
time_t seconds = (time_t)(timeout.count() / 1000);
ts.tv_sec += seconds;
ts.tv_nsec += (long)((timeout.count() - (seconds * 1000)) * 1000000);
constexpr long nsec = 1000000000LL;
if(ts.tv_nsec >= nsec)
{
ts.tv_nsec -= nsec;
ts.tv_sec += 1;
}
int ret = sem_timedwait(&prv->semaphore, &ts);
if(ret < 0)
{
if(errno == ETIMEDOUT)
{
return false;
}
perror("sem_timedwait()");
assert(false);
}
#endif
return true;
}
void Semaphore::wait()
{
#ifdef WIN32
WaitForSingleObject(prv->semaphore, INFINITE);
#else
sem_wait(&prv->semaphore);
#endif
}
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