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Improve the Win32 reader-writer lock implementation by making it just a normal

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lock.  This is obviously bad, but at least it's threadsafe!  If you know how
to improve this in a pre-Vista friendly well, patches welcome!

Patch by Max Burke.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73607 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2009-06-17 09:10:42 +00:00
parent 8189d40a8d
commit c9f8e8ebab
1 changed files with 14 additions and 6 deletions
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20
lib/System/Win32/RWMutex.inc
View File

@ -18,31 +18,39 @@
#include "Win32.h"
// FIXME: THIS IS NOT THREAD-SAFE!!
// Windows does not have reader-writer locks pre-Vista. If you want to have
// thread-safe LLVM on Windows, for now at least, you need to use a pthreads
// replacement library.
// 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;
RWMutex::RWMutex() { }
RWMutex::RWMutex() {
data_ = calloc(1, sizeof(CRITICAL_SECTION));
InitializeCriticalSection(static_cast<LPCRITICAL_SECTION>(data_));
}
RWMutex::~RWMutex() { }
RWMutex::~RWMutex() {
DeleteCriticalSection(static_cast<LPCRITICAL_SECTION>(data_));
free(data_);
}
bool RWMutex::reader_acquire() {
EnterCriticalSection(static_cast<LPCRITICAL_SECTION>(data_));
return true;
}
bool RWMutex::reader_release() {
LeaveCriticalSection(static_cast<LPCRITICAL_SECTION>(data_));
return true;
}
bool RWMutex::writer_acquire() {
EnterCriticalSection(static_cast<LPCRITICAL_SECTION>(data_));
return true;
}
bool RWMutex::writer_release() {
LeaveCriticalSection(static_cast<LPCRITICAL_SECTION>(data_));
return true;
}