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/*
Title: Mutex and Condition Variable library.
Copyright (c) 2007, 2012 David C. J. Matthews
This library 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 library 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 library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef LOCKING_H_DEFINED
#define LOCKING_H_DEFINED
#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_WIN32)
#include "winconfig.h"
#else
#error "No configuration file"
#endif
#ifdef HAVE_WINDOWS_H
#include <windows.h>
#endif
#if ((!defined(_WIN32) || defined(__CYGWIN__)) && defined(HAVE_SEMAPHORE_H))
// Don't include semaphore.h on Mingw. It's provided but doesn't compile.
#include <semaphore.h>
#endif
#if ((!defined(_WIN32) || defined(__CYGWIN__)) && defined(HAVE_PTHREAD_H))
// Don't include pthread if this is native Windows and not Cygwin
#include <pthread.h>
#endif
// Simple Mutex.
class PLock {
public:
PLock(const char *n = 0);
~PLock();
void Lock(void); // Lock the mutex
void Unlock(void); // Unlock the mutex
bool Trylock(void); // Try to lock the mutex - returns true if succeeded
private:
#if ((!defined(_WIN32) || defined(__CYGWIN__)) && defined(HAVE_PTHREAD_H))
pthread_mutex_t lock;
#elif defined(HAVE_WINDOWS_H)
CRITICAL_SECTION lock;
#endif
// Debugging info.
const char *lockName;
unsigned lockCount;
friend class PCondVar;
};
// Lock a mutex and automatically unlock it in the destructor.
// This can be used in a function to lock a mutex and unlock it
// when the function either returns normally or raises an exception.
class PLocker {
public:
PLocker(PLock *lock): m_lock(lock) { m_lock->Lock(); }
~PLocker() { m_lock->Unlock(); }
private:
PLock *m_lock;
};
// Simple condition variable. N.B. The Windows code does not
// support multiple threads blocking on this condition variable.
class PCondVar {
public:
PCondVar();
~PCondVar();
void Wait(PLock *pLock); // Wait indefinitely. Drops the lock and reaquires it.
// Wait for a signal or until the time. The argument is an absolute time
// represented as a struct timespec in Unix and a FILETIME in Windows.
#if (defined(_WIN32) && ! defined(__CYGWIN__))
void WaitUntil(PLock *pLock, const FILETIME *timeArg);
#else
void WaitUntil(PLock *pLock, const timespec *timeArg);
#endif
// Wait for a time. This is used internally in the RTS.
bool WaitFor(PLock *pLock, unsigned milliseconds);
// N.B. Signal MUST be called only with the lock held.
void Signal(void); // Wake up the waiting thread.
private:
#if ((!defined(_WIN32) || defined(__CYGWIN__)) && defined(HAVE_PTHREAD_H))
pthread_cond_t cond;
#elif defined(HAVE_WINDOWS_H)
CONDITION_VARIABLE cond;
#endif
};
// Semaphore. Wrapper for Posix semaphore or Windows semaphore.
class PSemaphore {
public:
PSemaphore();
~PSemaphore();
bool Init(unsigned init, unsigned max);
bool Wait(void);
void Signal(void);
private:
#if ((!defined(_WIN32) || defined(__CYGWIN__)) && defined(HAVE_SEMAPHORE_H))
sem_t localSema, *sema;
bool isLocal;
#elif defined(HAVE_WINDOWS_H)
HANDLE sema;
#endif
};
#endif
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