forked from OSchip/llvm-project
123 lines
3.2 KiB
C++
123 lines
3.2 KiB
C++
//===- Mutex.cpp - Mutual Exclusion Lock ------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the llvm::sys::Mutex class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Config/config.h"
|
|
#include "llvm/Support/Mutex.h"
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
//=== WARNING: Implementation here must contain only TRULY operating system
|
|
//=== independent code.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#if !defined(LLVM_ENABLE_THREADS) || LLVM_ENABLE_THREADS == 0
|
|
// Define all methods as no-ops if threading is explicitly disabled
|
|
namespace llvm {
|
|
using namespace sys;
|
|
MutexImpl::MutexImpl( bool recursive) { }
|
|
MutexImpl::~MutexImpl() { }
|
|
bool MutexImpl::acquire() { return true; }
|
|
bool MutexImpl::release() { return true; }
|
|
bool MutexImpl::tryacquire() { return true; }
|
|
}
|
|
#else
|
|
|
|
#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_MUTEX_LOCK)
|
|
|
|
#include <cassert>
|
|
#include <pthread.h>
|
|
#include <stdlib.h>
|
|
|
|
namespace llvm {
|
|
using namespace sys;
|
|
|
|
// Construct a Mutex using pthread calls
|
|
MutexImpl::MutexImpl( bool recursive)
|
|
: data_(nullptr)
|
|
{
|
|
// Declare the pthread_mutex data structures
|
|
pthread_mutex_t* mutex =
|
|
static_cast<pthread_mutex_t*>(malloc(sizeof(pthread_mutex_t)));
|
|
pthread_mutexattr_t attr;
|
|
|
|
// Initialize the mutex attributes
|
|
int errorcode = pthread_mutexattr_init(&attr);
|
|
assert(errorcode == 0); (void)errorcode;
|
|
|
|
// Initialize the mutex as a recursive mutex, if requested, or normal
|
|
// otherwise.
|
|
int kind = ( recursive ? PTHREAD_MUTEX_RECURSIVE : PTHREAD_MUTEX_NORMAL );
|
|
errorcode = pthread_mutexattr_settype(&attr, kind);
|
|
assert(errorcode == 0);
|
|
|
|
// Initialize the mutex
|
|
errorcode = pthread_mutex_init(mutex, &attr);
|
|
assert(errorcode == 0);
|
|
|
|
// Destroy the attributes
|
|
errorcode = pthread_mutexattr_destroy(&attr);
|
|
assert(errorcode == 0);
|
|
|
|
// Assign the data member
|
|
data_ = mutex;
|
|
}
|
|
|
|
// Destruct a Mutex
|
|
MutexImpl::~MutexImpl()
|
|
{
|
|
pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_);
|
|
assert(mutex != nullptr);
|
|
pthread_mutex_destroy(mutex);
|
|
free(mutex);
|
|
}
|
|
|
|
bool
|
|
MutexImpl::acquire()
|
|
{
|
|
pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_);
|
|
assert(mutex != nullptr);
|
|
|
|
int errorcode = pthread_mutex_lock(mutex);
|
|
return errorcode == 0;
|
|
}
|
|
|
|
bool
|
|
MutexImpl::release()
|
|
{
|
|
pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_);
|
|
assert(mutex != nullptr);
|
|
|
|
int errorcode = pthread_mutex_unlock(mutex);
|
|
return errorcode == 0;
|
|
}
|
|
|
|
bool
|
|
MutexImpl::tryacquire()
|
|
{
|
|
pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_);
|
|
assert(mutex != nullptr);
|
|
|
|
int errorcode = pthread_mutex_trylock(mutex);
|
|
return errorcode == 0;
|
|
}
|
|
|
|
}
|
|
|
|
#elif defined(LLVM_ON_UNIX)
|
|
#include "Unix/Mutex.inc"
|
|
#elif defined( LLVM_ON_WIN32)
|
|
#include "Windows/Mutex.inc"
|
|
#else
|
|
#warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 was set in Support/Mutex.cpp
|
|
#endif
|
|
#endif
|