/usr/include/eiskaltdcpp/dcpp/Semaphore.h is in libeiskaltdcpp-dev 2.2.9-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2001-2012 Jacek Sieka, arnetheduck on gmail point com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU 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.
*/
#pragma once
#ifndef _WIN32
#ifdef APPLE
#include "CriticalSection.h"
#else
#include <errno.h>
#include <semaphore.h>
#endif
#include <sys/time.h>
#endif
#include "noexcept.h"
namespace dcpp {
class Semaphore
{
#if defined(_WIN32)
public:
Semaphore() noexcept {
h = CreateSemaphore(NULL, 0, MAXLONG, NULL);
}
void signal() noexcept {
ReleaseSemaphore(h, 1, NULL);
}
bool wait() noexcept { return WaitForSingleObject(h, INFINITE) == WAIT_OBJECT_0; }
bool wait(uint32_t millis) noexcept { return WaitForSingleObject(h, millis) == WAIT_OBJECT_0; }
~Semaphore() {
CloseHandle(h);
}
private:
HANDLE h;
#elif defined(APPLE)
public:
Semaphore() noexcept : count(0) { pthread_cond_init(&cond, NULL); }
~Semaphore() { pthread_cond_destroy(&cond); }
void signal() noexcept {
Lock l(cs);
count++;
pthread_cond_signal(&cond);
}
bool wait() noexcept {
Lock l(cs);
while (count == 0) {
pthread_cond_wait(&cond, &cs.getMutex());
}
count--;
return true;
}
bool wait(uint32_t millis) noexcept {
Lock l(cs);
if(count == 0) {
timeval timev;
timespec t;
gettimeofday(&timev, NULL);
millis+=timev.tv_usec/1000;
t.tv_sec = timev.tv_sec + (millis/1000);
t.tv_nsec = (millis%1000)*1000*1000;
int ret;
do {
ret = pthread_cond_timedwait(&cond, &cs.getMutex(), &t);
} while (ret==0 && count==0);
if(ret != 0) {
return false;
}
}
count--;
return true;
}
private:
pthread_cond_t cond;
CriticalSection cs;
int count;
#else
public:
Semaphore() noexcept {
sem_init(&semaphore, 0, 0);
}
~Semaphore() {
sem_destroy(&semaphore);
}
void signal() noexcept {
sem_post(&semaphore);
}
bool wait() noexcept {
int retval = 0;
do {
retval = sem_wait(&semaphore);
} while (retval != 0);
return true;
}
bool wait(uint32_t millis) noexcept {
timeval timev;
timespec t;
gettimeofday(&timev, NULL);
millis+=timev.tv_usec/1000;
t.tv_sec = timev.tv_sec + (millis/1000);
t.tv_nsec = (millis%1000)*1000*1000;
int ret;
do {
ret = sem_timedwait(&semaphore, &t);
} while (ret != 0 && errno == EINTR);
if (ret != 0) {
return false;
}
return true;
}
private:
sem_t semaphore;
#endif
Semaphore(const Semaphore&);
Semaphore& operator=(const Semaphore&);
};
} // namespace dcpp
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