#define LLVM_SYSTEM_MUTEX_H
#include "llvm/System/Threading.h"
+#include <cassert>
namespace llvm
{
/// @name Platform Dependent Data
/// @{
private:
-#ifdef ENABLE_THREADS
void* data_; ///< We don't know what the data will be
-#endif
/// @}
/// @name Do Not Implement
/// indicates whether this mutex should become a no-op when we're not
/// running in multithreaded mode.
template<bool mt_only>
- class SmartMutex {
- MutexImpl mtx;
+ class SmartMutex : public MutexImpl {
+ unsigned acquired;
+ bool recursive;
public:
- explicit SmartMutex(bool recursive = true) : mtx(recursive) { }
+ explicit SmartMutex(bool rec = true) :
+ MutexImpl(rec), acquired(0), recursive(rec) { }
bool acquire() {
- if (!mt_only || (mt_only && llvm_is_multithreaded()))
- return mtx.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 || (mt_only && llvm_is_multithreaded()))
- return mtx.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;
}
bool tryacquire() {
- if (!mt_only || (mt_only && llvm_is_multithreaded()))
- return mtx.tryacquire();
+ if (!mt_only || llvm_is_multithreaded())
+ return MutexImpl::tryacquire();
return true;
}
private:
- SmartMutex<mt_only>(const SmartMutex<mt_only> & original);
+ SmartMutex(const SmartMutex<mt_only> & original);
void operator=(const SmartMutex<mt_only> &);
};
/// Mutex - A standard, always enforced mutex.
typedef SmartMutex<false> Mutex;
+
+ template<bool mt_only>
+ class SmartScopedLock {
+ SmartMutex<mt_only>* mtx;
+
+ public:
+ SmartScopedLock(SmartMutex<mt_only>* m) : mtx(m) {
+ mtx->acquire();
+ }
+
+ ~SmartScopedLock() {
+ mtx->release();
+ }
+ };
+
+ typedef SmartScopedLock<false> ScopedLock;
}
}