Debugging changes

• Introduce new const DEBUG bool in the emper namespace
• Remember the Context's fiber
• Use if constexpr(emper::DEBUG) instead of #ifndef NDEBUG to exclude debug code from release builds

emper/BinaryPrivateSemaphore.cpp

@@ -7,6 +7,7 @@
 #include "Common.hpp"		// for unlikely
 #include "Context.hpp"	// for Context
 #include "Debug.hpp"		// for LOGDD
+#include "Emper.hpp"		// for emper::DEBUG
 
 void BinaryPrivateSemaphore::wait() {
 	State state = bpsState.load();
@@ -28,13 +29,13 @@ void BinaryPrivateSemaphore::wait() {
 		State newState = blocked;
 		State previousState = bpsState.exchange(newState);
 		if (previousState == signaled) {
-#ifndef NDEBUG
-			// Reset the real signal state only in debug
-			// builds. As it is not required to set the state here
-			// for the correctnes of the synchronization primitive.
-			newState = signaled;
-			bpsState.store(newState, std::memory_order_relaxed);
-#endif
+			if constexpr (emper::DEBUG) {
+				// Reset the real signal state only in debug
+				// builds. As it is not required to set the state here
+				// for the correctnes of the synchronization primitive.
+				newState = signaled;
+				bpsState.store(newState, std::memory_order_relaxed);
+			}
 			unblock(blockedContext);
 		}
 	});
@@ -48,13 +49,13 @@ auto BinaryPrivateSemaphore::signalInternal() -> Context* {
 	if (currentState != initial) {
 		// Fast path: If the state is not initial then someone is
 		// waiting, because the state can't be signaled.
-#ifndef NDEBUG
-		State newState = signaled;
-		// Reset the real signal state only in debug
-		// builds. As it is not required to set the state here
-		// for the correctnes of the synchronization primitive.
-		bpsState.store(newState);
-#endif
+		if constexpr (emper::DEBUG) {
+			State newState = signaled;
+			// Reset the real signal state only in debug
+			// builds. As it is not required to set the state here
+			// for the correctnes of the synchronization primitive.
+			bpsState.store(newState);
+		}
 		LOGDD("unblock in fast path");
 		return blockedContext;
 	}