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#ifndef _sys_posix_Mutex_h
#define _sys_posix_Mutex_h
/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "check.h"
#include <pthread.h>
#include <boost/noncopyable.hpp>
namespace qpid {
namespace sys {
class Condition;
/**
* Mutex lock.
*/
class Mutex : private boost::noncopyable {
friend class Condition;
public:
typedef ::qpid::sys::ScopedLock<Mutex> ScopedLock;
typedef ::qpid::sys::ScopedUnlock<Mutex> ScopedUnlock;
inline Mutex();
inline ~Mutex();
inline void lock();
inline void unlock();
inline bool trylock();
protected:
pthread_mutex_t mutex;
};
/**
* RW lock.
*/
class RWlock : private boost::noncopyable {
friend class Condition;
public:
typedef ::qpid::sys::ScopedRlock<RWlock> ScopedRlock;
typedef ::qpid::sys::ScopedWlock<RWlock> ScopedWlock;
inline RWlock();
inline ~RWlock();
inline void wlock(); // will write-lock
inline void rlock(); // will read-lock
inline void unlock();
inline void trywlock(); // will write-try
inline void tryrlock(); // will read-try
protected:
pthread_rwlock_t rwlock;
};
/**
* Initialise a recursive mutex attr for use in creating mutexes later
* (we use pthread_once to make sure it is initialised exactly once)
*/
namespace {
pthread_once_t onceControl = PTHREAD_ONCE_INIT;
pthread_rwlockattr_t rwlockattr;
pthread_mutexattr_t mutexattr;
void initMutexattr() {
pthread_mutexattr_init(&mutexattr);
pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_RECURSIVE);
}
void initRWlockattr() {
pthread_rwlockattr_init(&rwlockattr);
}
struct RecursiveMutexattr {
RecursiveMutexattr() {
pthread_once(&onceControl, initMutexattr);
}
operator const pthread_mutexattr_t*() const {
return &mutexattr;
}
};
struct RecursiveRWlockattr {
RecursiveRWlockattr() {
pthread_once(&onceControl, initRWlockattr);
}
operator const pthread_rwlockattr_t*() const {
return &rwlockattr;
}
};
RecursiveMutexattr recursiveMutexattr;
RecursiveRWlockattr recursiveRWlockattr;
}
/**
* PODMutex is a POD, can be static-initialized with
* PODMutex m = QPID_PODMUTEX_INITIALIZER
*/
struct PODMutex
{
typedef ::qpid::sys::ScopedLock<PODMutex> ScopedLock;
inline void lock();
inline void unlock();
inline bool trylock();
// Must be public to be a POD:
pthread_mutex_t mutex;
};
#define QPID_MUTEX_INITIALIZER { PTHREAD_MUTEX_INITIALIZER }
void PODMutex::lock() {
QPID_POSIX_ASSERT_THROW_IF(pthread_mutex_lock(&mutex));
}
void PODMutex::unlock() {
QPID_POSIX_ASSERT_THROW_IF(pthread_mutex_unlock(&mutex));
}
bool PODMutex::trylock() {
return pthread_mutex_trylock(&mutex) == 0;
}
Mutex::Mutex() {
QPID_POSIX_ASSERT_THROW_IF(pthread_mutex_init(&mutex, recursiveMutexattr));
}
Mutex::~Mutex(){
QPID_POSIX_ASSERT_THROW_IF(pthread_mutex_destroy(&mutex));
}
void Mutex::lock() {
QPID_POSIX_ASSERT_THROW_IF(pthread_mutex_lock(&mutex));
}
void Mutex::unlock() {
QPID_POSIX_ASSERT_THROW_IF(pthread_mutex_unlock(&mutex));
}
bool Mutex::trylock() {
return pthread_mutex_trylock(&mutex) == 0;
}
RWlock::RWlock() {
QPID_POSIX_ASSERT_THROW_IF(pthread_rwlock_init(&rwlock, recursiveRWlockattr));
}
RWlock::~RWlock(){
QPID_POSIX_ASSERT_THROW_IF(pthread_rwlock_destroy(&rwlock));
}
void RWlock::wlock() {
QPID_POSIX_ASSERT_THROW_IF(pthread_rwlock_wrlock(&rwlock));
}
void RWlock::rlock() {
QPID_POSIX_ASSERT_THROW_IF(pthread_rwlock_rdlock(&rwlock));
}
void RWlock::unlock() {
QPID_POSIX_ASSERT_THROW_IF(pthread_rwlock_unlock(&rwlock));
}
void RWlock::trywlock() {
QPID_POSIX_ASSERT_THROW_IF(pthread_rwlock_trywrlock(&rwlock));
}
void RWlock::tryrlock() {
QPID_POSIX_ASSERT_THROW_IF(pthread_rwlock_tryrdlock(&rwlock));
}
}}
#endif /*!_sys_posix_Mutex_h*/
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