[llvm-commits] [llvm] r73803 - in /llvm/trunk/include/llvm/System: Mutex.h RWMutex.h
Owen Anderson
resistor at mac.com
Fri Jun 19 17:27:21 PDT 2009
Author: resistor
Date: Fri Jun 19 19:27:21 2009
New Revision: 73803
URL: http://llvm.org/viewvc/llvm-project?rev=73803&view=rev
Log:
Add debugging code to test for various locking faux-pas's, when running in single threaded mode. This should help improve testing coverage for
threading support, without having extensive actually concurrent clients yet.
Modified:
llvm/trunk/include/llvm/System/Mutex.h
llvm/trunk/include/llvm/System/RWMutex.h
Modified: llvm/trunk/include/llvm/System/Mutex.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/System/Mutex.h?rev=73803&r1=73802&r2=73803&view=diff
==============================================================================
--- llvm/trunk/include/llvm/System/Mutex.h (original)
+++ llvm/trunk/include/llvm/System/Mutex.h Fri Jun 19 19:27:21 2009
@@ -15,6 +15,7 @@
#define LLVM_SYSTEM_MUTEX_H
#include "llvm/System/Threading.h"
+#include <cassert>
namespace llvm
{
@@ -85,18 +86,32 @@
/// running in multithreaded mode.
template<bool mt_only>
class SmartMutex : public MutexImpl {
+ unsigned acquired;
+ bool recursive;
public:
- explicit SmartMutex(bool recursive = true) : MutexImpl(recursive) { }
+ explicit SmartMutex(bool rec = true) :
+ MutexImpl(rec), acquired(0), recursive(rec) { }
bool acquire() {
if (!mt_only || llvm_is_multithreaded())
return MutexImpl::acquire();
+
+ // Single-threaded debugging code. This would be racy in multithreaded
+ // mode, but provides not sanity checks in single threaded mode.
+ assert((recursive || acquired == 0) && "Lock already acquired!!");
+ ++acquired;
return true;
}
bool release() {
if (!mt_only || llvm_is_multithreaded())
return MutexImpl::release();
+
+ // Single-threaded debugging code. This would be racy in multithreaded
+ // mode, but provides not sanity checks in single threaded mode.
+ assert(((recursive && acquired) || (acquired == 1)) &&
+ "Lock not acquired before release!");
+ --acquired;
return true;
}
Modified: llvm/trunk/include/llvm/System/RWMutex.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/System/RWMutex.h?rev=73803&r1=73802&r2=73803&view=diff
==============================================================================
--- llvm/trunk/include/llvm/System/RWMutex.h (original)
+++ llvm/trunk/include/llvm/System/RWMutex.h Fri Jun 19 19:27:21 2009
@@ -15,6 +15,7 @@
#define LLVM_SYSTEM_RWMUTEX_H
#include "llvm/System/Threading.h"
+#include <cassert>
namespace llvm
{
@@ -84,30 +85,50 @@
/// running in multithreaded mode.
template<bool mt_only>
class SmartRWMutex : public RWMutexImpl {
+ unsigned readers, writers;
public:
- explicit SmartRWMutex() : RWMutexImpl() { }
+ explicit SmartRWMutex() : RWMutexImpl(), readers(0), writers(0) { }
bool reader_acquire() {
if (!mt_only || llvm_is_multithreaded())
return RWMutexImpl::reader_acquire();
+
+ // Single-threaded debugging code. This would be racy in multithreaded
+ // mode, but provides not sanity checks in single threaded mode.
+ ++readers;
return true;
}
bool reader_release() {
if (!mt_only || llvm_is_multithreaded())
return RWMutexImpl::reader_release();
+
+ // Single-threaded debugging code. This would be racy in multithreaded
+ // mode, but provides not sanity checks in single threaded mode.
+ assert(readers > 0 && "Reader lock not acquired before release!");
+ --readers;
return true;
}
bool writer_acquire() {
if (!mt_only || llvm_is_multithreaded())
return RWMutexImpl::writer_acquire();
+
+ // Single-threaded debugging code. This would be racy in multithreaded
+ // mode, but provides not sanity checks in single threaded mode.
+ assert(writers == 0 && "Writer lock already acquired!");
+ ++writers;
return true;
}
bool writer_release() {
if (!mt_only || llvm_is_multithreaded())
return RWMutexImpl::writer_release();
+
+ // Single-threaded debugging code. This would be racy in multithreaded
+ // mode, but provides not sanity checks in single threaded mode.
+ assert(writers == 1 && "Writer lock not acquired before release!");
+ --writers;
return true;
}
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