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authorMichael J. Spencer <bigcheesegs@gmail.com>2010-11-29 18:16:10 +0000
committerMichael J. Spencer <bigcheesegs@gmail.com>2010-11-29 18:16:10 +0000
commit1f6efa3996dd1929fbc129203ce5009b620e6969 (patch)
tree6b782914982f90d3a983bcefef98b8ef68ab2961 /lib/Support/Windows/RWMutex.inc
parent9363f739cdc3bd02e8516a25de0090f52ae12fbb (diff)
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Merge System into Support.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120298 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Support/Windows/RWMutex.inc')
-rw-r--r--lib/Support/Windows/RWMutex.inc58
1 files changed, 58 insertions, 0 deletions
diff --git a/lib/Support/Windows/RWMutex.inc b/lib/Support/Windows/RWMutex.inc
new file mode 100644
index 0000000..82ae8af
--- /dev/null
+++ b/lib/Support/Windows/RWMutex.inc
@@ -0,0 +1,58 @@
+//= 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 "Windows.h"
+
+// FIXME: Windows does not have reader-writer locks pre-Vista. If you want
+// real reader-writer locks, you a threads 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;
+}
+
+
+}