#include "llvm/Config/config.h"
#include "llvm/Support/RWMutex.h"
#include <cstring>
#if !defined(LLVM_ENABLE_THREADS) || LLVM_ENABLE_THREADS == 0
namespace llvm {
using namespace sys;
RWMutexImpl::RWMutexImpl() { }
RWMutexImpl::~RWMutexImpl() { }
bool RWMutexImpl::reader_acquire() { return true; }
bool RWMutexImpl::reader_release() { return true; }
bool RWMutexImpl::writer_acquire() { return true; }
bool RWMutexImpl::writer_release() { return true; }
}
#else
#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_RWLOCK_INIT)
#include <cassert>
#include <pthread.h>
#include <stdlib.h>
namespace llvm {
using namespace sys;
RWMutexImpl::RWMutexImpl()
: data_(nullptr)
{
pthread_rwlock_t* rwlock =
static_cast<pthread_rwlock_t*>(malloc(sizeof(pthread_rwlock_t)));
#ifdef __APPLE__
bzero(rwlock, sizeof(pthread_rwlock_t));
#endif
int errorcode = pthread_rwlock_init(rwlock, nullptr);
(void)errorcode;
assert(errorcode == 0);
data_ = rwlock;
}
RWMutexImpl::~RWMutexImpl()
{
pthread_rwlock_t* rwlock = static_cast<pthread_rwlock_t*>(data_);
assert(rwlock != nullptr);
pthread_rwlock_destroy(rwlock);
free(rwlock);
}
bool
RWMutexImpl::reader_acquire()
{
pthread_rwlock_t* rwlock = static_cast<pthread_rwlock_t*>(data_);
assert(rwlock != nullptr);
int errorcode = pthread_rwlock_rdlock(rwlock);
return errorcode == 0;
}
bool
RWMutexImpl::reader_release()
{
pthread_rwlock_t* rwlock = static_cast<pthread_rwlock_t*>(data_);
assert(rwlock != nullptr);
int errorcode = pthread_rwlock_unlock(rwlock);
return errorcode == 0;
}
bool
RWMutexImpl::writer_acquire()
{
pthread_rwlock_t* rwlock = static_cast<pthread_rwlock_t*>(data_);
assert(rwlock != nullptr);
int errorcode = pthread_rwlock_wrlock(rwlock);
return errorcode == 0;
}
bool
RWMutexImpl::writer_release()
{
pthread_rwlock_t* rwlock = static_cast<pthread_rwlock_t*>(data_);
assert(rwlock != nullptr);
int errorcode = pthread_rwlock_unlock(rwlock);
return errorcode == 0;
}
}
#elif defined(LLVM_ON_UNIX)
#include "Unix/RWMutex.inc"
#elif defined( LLVM_ON_WIN32)
#include "Windows/RWMutex.inc"
#else
#warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 was set in Support/Mutex.cpp
#endif
#endif