SSemaphore basic implementation

Set for RSX

Utilities/SSemaphore.cpp

@@ -0,0 +1,75 @@
+#include "stdafx.h"
+#include "Utilities/SSemaphore.h"
+
+bool SSemaphore::wait(u64 timeout)
+{
+	std::unique_lock<std::mutex> lock(m_cv_mutex);
+	
+	u64 counter = 0;
+	while (true)
+	{
+		if (Emu.IsStopped())
+		{
+			return false;
+		}
+		if (timeout && counter >= timeout)
+		{
+			return false;
+		}
+		m_cond.wait_for(lock, std::chrono::milliseconds(1));
+		counter++;
+
+		std::lock_guard<std::mutex> lock(m_mutex);
+		if (m_count)
+		{
+			m_count--;
+			return true;
+		}
+	}
+}
+
+bool SSemaphore::try_wait()
+{
+	std::lock_guard<std::mutex> lock(m_mutex);
+
+	if (m_count)
+	{
+		m_count--;
+		return true;
+	}
+	else
+	{
+		return false;
+	}
+}
+
+void SSemaphore::post(u32 value)
+{
+	std::lock_guard<std::mutex> lock(m_mutex);
+
+	if (m_count >= m_max)
+	{
+		value = 0;
+	}
+	else if (value > (m_max - m_count))
+	{
+		value = m_max - m_count;
+	}
+
+	while (value)
+	{
+		m_count++;
+		value--;
+		m_cond.notify_one();
+	}
+}
+
+bool SSemaphore::post_and_wait()
+{
+	if (try_wait()) return false;
+
+	post();
+	wait();
+
+	return true;
+}