PThreadMutex.h
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//===-- PThreadMutex.h ------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Created by Greg Clayton on 6/16/07.
//
//===----------------------------------------------------------------------===//
#ifndef __PThreadMutex_h__
#define __PThreadMutex_h__
#include <assert.h>
#include <pthread.h>
#include <stdint.h>
//#define DEBUG_PTHREAD_MUTEX_DEADLOCKS 1
#if defined(DEBUG_PTHREAD_MUTEX_DEADLOCKS)
#define PTHREAD_MUTEX_LOCKER(var, mutex) \
PThreadMutex::Locker var(mutex, __FUNCTION__, __FILE__, __LINE__)
#else
#define PTHREAD_MUTEX_LOCKER(var, mutex) PThreadMutex::Locker var(mutex)
#endif
class PThreadMutex {
public:
class Locker {
public:
#if defined(DEBUG_PTHREAD_MUTEX_DEADLOCKS)
Locker(PThreadMutex &m, const char *function, const char *file, int line);
Locker(PThreadMutex *m, const char *function, const char *file, int line);
Locker(pthread_mutex_t *mutex, const char *function, const char *file,
int line);
~Locker();
void Lock();
void Unlock();
#else
Locker(PThreadMutex &m) : m_pMutex(m.Mutex()) { Lock(); }
Locker(PThreadMutex *m) : m_pMutex(m ? m->Mutex() : NULL) { Lock(); }
Locker(pthread_mutex_t *mutex) : m_pMutex(mutex) { Lock(); }
void Lock() {
if (m_pMutex)
::pthread_mutex_lock(m_pMutex);
}
void Unlock() {
if (m_pMutex)
::pthread_mutex_unlock(m_pMutex);
}
~Locker() { Unlock(); }
#endif
// unlock any the current mutex and lock the new one if it is valid
void Reset(pthread_mutex_t *pMutex = NULL) {
Unlock();
m_pMutex = pMutex;
Lock();
}
pthread_mutex_t *m_pMutex;
#if defined(DEBUG_PTHREAD_MUTEX_DEADLOCKS)
const char *m_function;
const char *m_file;
int m_line;
uint64_t m_lock_time;
#endif
};
PThreadMutex() {
int err;
err = ::pthread_mutex_init(&m_mutex, NULL);
assert(err == 0);
}
PThreadMutex(int type) {
int err;
::pthread_mutexattr_t attr;
err = ::pthread_mutexattr_init(&attr);
assert(err == 0);
err = ::pthread_mutexattr_settype(&attr, type);
assert(err == 0);
err = ::pthread_mutex_init(&m_mutex, &attr);
assert(err == 0);
err = ::pthread_mutexattr_destroy(&attr);
assert(err == 0);
}
~PThreadMutex() {
int err;
err = ::pthread_mutex_destroy(&m_mutex);
if (err != 0) {
err = Unlock();
if (err == 0)
::pthread_mutex_destroy(&m_mutex);
}
}
pthread_mutex_t *Mutex() { return &m_mutex; }
int Lock() { return ::pthread_mutex_lock(&m_mutex); }
int Unlock() { return ::pthread_mutex_unlock(&m_mutex); }
protected:
pthread_mutex_t m_mutex;
};
#endif