Merge remote-tracking branch 'Userspace/master'

Userspace/libc/src/Lock.cpp

@@ -0,0 +1,35 @@
+#include "lock.hpp"
+#include <stdio.h>
+
+void LockClass::DeadLock(SpinLockData Lock)
+{
+	fprintf(stdout, "Potential deadlock in lock '%s' held by '%s'! %ld locks in queue.",
+			Lock.AttemptingToGet, Lock.CurrentHolder, Lock.Count);
+}
+
+int LockClass::Lock(const char *FunctionName)
+{
+	LockData.AttemptingToGet = FunctionName;
+Retry:
+	unsigned int i = 0;
+	while (__atomic_exchange_n(&IsLocked, true, __ATOMIC_ACQUIRE) && ++i < 0x10000000)
+		;
+	if (i >= 0x10000000)
+	{
+		DeadLock(LockData);
+		goto Retry;
+	}
+	LockData.Count++;
+	LockData.CurrentHolder = FunctionName;
+	__sync_synchronize();
+	return 0;
+}
+
+int LockClass::Unlock()
+{
+	__sync_synchronize();
+	__atomic_store_n(&IsLocked, false, __ATOMIC_RELEASE);
+	LockData.Count--;
+	IsLocked = false;
+	return 0;
+}