#define LLVM_SYSTEM_MUTEX_H
#include "llvm/System/Threading.h"
+#include <cassert>
namespace llvm
{
/// 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;
}