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124 lines
3.2 KiB
C++
124 lines
3.2 KiB
C++
//===- Mutex.cpp - Mutual Exclusion Lock ------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the llvm::sys::Mutex class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Mutex.h"
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#include "llvm/Config/config.h"
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#include "llvm/Support/ErrorHandling.h"
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only TRULY operating system
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//=== independent code.
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//===----------------------------------------------------------------------===//
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#if !defined(LLVM_ENABLE_THREADS) || LLVM_ENABLE_THREADS == 0
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// Define all methods as no-ops if threading is explicitly disabled
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namespace llvm {
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using namespace sys;
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MutexImpl::MutexImpl( bool recursive) { }
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MutexImpl::~MutexImpl() { }
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bool MutexImpl::acquire() { return true; }
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bool MutexImpl::release() { return true; }
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bool MutexImpl::tryacquire() { return true; }
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}
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#else
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#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_MUTEX_LOCK)
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#include <cassert>
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#include <pthread.h>
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#include <stdlib.h>
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namespace llvm {
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using namespace sys;
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// Construct a Mutex using pthread calls
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MutexImpl::MutexImpl( bool recursive)
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: data_(nullptr)
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{
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// Declare the pthread_mutex data structures
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pthread_mutex_t* mutex =
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static_cast<pthread_mutex_t*>(safe_malloc(sizeof(pthread_mutex_t)));
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pthread_mutexattr_t attr;
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// Initialize the mutex attributes
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int errorcode = pthread_mutexattr_init(&attr);
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assert(errorcode == 0); (void)errorcode;
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// Initialize the mutex as a recursive mutex, if requested, or normal
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// otherwise.
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int kind = ( recursive ? PTHREAD_MUTEX_RECURSIVE : PTHREAD_MUTEX_NORMAL );
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errorcode = pthread_mutexattr_settype(&attr, kind);
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assert(errorcode == 0);
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// Initialize the mutex
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errorcode = pthread_mutex_init(mutex, &attr);
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assert(errorcode == 0);
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// Destroy the attributes
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errorcode = pthread_mutexattr_destroy(&attr);
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assert(errorcode == 0);
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// Assign the data member
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data_ = mutex;
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}
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// Destruct a Mutex
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MutexImpl::~MutexImpl()
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{
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pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_);
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assert(mutex != nullptr);
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pthread_mutex_destroy(mutex);
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free(mutex);
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}
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bool
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MutexImpl::acquire()
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{
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pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_);
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assert(mutex != nullptr);
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int errorcode = pthread_mutex_lock(mutex);
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return errorcode == 0;
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}
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bool
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MutexImpl::release()
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{
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pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_);
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assert(mutex != nullptr);
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int errorcode = pthread_mutex_unlock(mutex);
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return errorcode == 0;
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}
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bool
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MutexImpl::tryacquire()
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{
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pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_);
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assert(mutex != nullptr);
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int errorcode = pthread_mutex_trylock(mutex);
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return errorcode == 0;
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}
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}
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#elif defined(LLVM_ON_UNIX)
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#include "Unix/Mutex.inc"
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#elif defined( _WIN32)
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#include "Windows/Mutex.inc"
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#else
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#warning Neither LLVM_ON_UNIX nor _WIN32 was set in Support/Mutex.cpp
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#endif
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#endif
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