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//= llvm/System/Win32/Mutex.inc - Win32 Reader/Writer Mutual Exclusion Lock =//
//
// 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 Win32 specific (non-pthread) RWMutex class.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only generic Win32 code that
//=== is guaranteed to work on *all* Win32 variants.
//===----------------------------------------------------------------------===//
#include "Win32.h"
// FIXME: Windows does not have reader-writer locks pre-Vista. If you want
// real reader-writer locks, you a pthreads implementation for Windows.
namespace llvm {
using namespace sys;
RWMutexImpl::RWMutexImpl() {
data_ = calloc(1, sizeof(CRITICAL_SECTION));
InitializeCriticalSection(static_cast<LPCRITICAL_SECTION>(data_));
}
RWMutexImpl::~RWMutexImpl() {
DeleteCriticalSection(static_cast<LPCRITICAL_SECTION>(data_));
free(data_);
}
bool RWMutexImpl::reader_acquire() {
EnterCriticalSection(static_cast<LPCRITICAL_SECTION>(data_));
return true;
}
bool RWMutexImpl::reader_release() {
LeaveCriticalSection(static_cast<LPCRITICAL_SECTION>(data_));
return true;
}
bool RWMutexImpl::writer_acquire() {
EnterCriticalSection(static_cast<LPCRITICAL_SECTION>(data_));
return true;
}
bool RWMutexImpl::writer_release() {
LeaveCriticalSection(static_cast<LPCRITICAL_SECTION>(data_));
return true;
}
}
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