xrCore: implemented Event for Linux (from LumixEngine under MIT License)

Author: eagleivg

src/xrCore/Threading/Event.cpp

@@ -7,20 +7,75 @@ Event::Event() noexcept { handle = (void*)CreateEvent(NULL, FALSE, FALSE, NULL);
 Event::~Event() noexcept { CloseHandle(handle); }
 void Event::Reset() noexcept { ResetEvent(handle); }
 void Event::Set() noexcept { SetEvent(handle); }
-void Event::Wait() const noexcept { WaitForSingleObject(handle, INFINITE); }
-bool Event::Wait(u32 millisecondsTimeout) const noexcept
+void Event::Wait() noexcept { WaitForSingleObject(handle, INFINITE); }
+bool Event::Wait(u32 millisecondsTimeout) noexcept
 {
     return WaitForSingleObject(handle, millisecondsTimeout) != WAIT_TIMEOUT;
 }
 #elif defined(LINUX)
-Event::Event() noexcept { handle = (void*)malloc(1); }
-Event::~Event() noexcept { free(handle); }
-void Event::Reset() noexcept { memset(handle, 1, 1); }
-void Event::Set() noexcept { memset(handle, 0, 1); }
-void Event::Wait() const noexcept { Sleep(0); }
-bool Event::Wait(u32 millisecondsTimeout) const noexcept
+#include <pthread.h>
+Event::Event() noexcept
 {
-	Sleep(millisecondsTimeout);
-    return true;
+	m_id.signaled = false;
+	pthread_mutex_init(&m_id.mutex, nullptr);
+	pthread_cond_init(&m_id.cond, nullptr);
+}
+Event::~Event() noexcept
+{
+	pthread_mutex_destroy(&m_id.mutex);
+	pthread_cond_destroy(&m_id.cond);
+}
+void Event::Reset() noexcept
+{
+	pthread_mutex_lock(&m_id.mutex);
+	pthread_cond_signal(&m_id.cond);
+	m_id.signaled = false;
+	pthread_mutex_unlock(&m_id.mutex);
+}
+void Event::Set() noexcept
+{
+	pthread_mutex_lock(&m_id.mutex);
+	pthread_cond_signal(&m_id.cond);
+	m_id.signaled = true;
+	pthread_mutex_unlock(&m_id.mutex);
+}
+void Event::Wait() noexcept
+{
+	pthread_mutex_lock(&m_id.mutex);
+
+	while (!m_id.signaled)
+	{
+		pthread_cond_wait(&m_id.cond, &m_id.mutex);
+	}
+
+	pthread_mutex_unlock(&m_id.mutex);
+}
+bool Event::Wait(u32 millisecondsTimeout) noexcept
+{
+	bool result = false;
+	pthread_mutex_lock(&m_id.mutex);
+
+	timespec ts;
+	clock_gettime(CLOCK_REALTIME, &ts);
+	ts.tv_nsec += (long) millisecondsTimeout * 1000 * 1000;
+	if(ts.tv_nsec > 1000000000)
+	{
+		ts.tv_nsec -= 1000000000;
+		ts.tv_sec += 1;
+	}
+
+	while(!m_id.signaled)
+	{
+		int res = pthread_cond_timedwait(&m_id.cond, &m_id.mutex, &ts);
+		if(res == ETIMEDOUT)
+		{
+			result = true;
+			break;
+		}
+	}
+
+	pthread_mutex_unlock(&m_id.mutex);
+
+	return result;
 }
 #endif

src/xrCore/Threading/Event.hpp

@@ -3,7 +3,20 @@
 
 class XRCORE_API Event
 {
+#if defined(WINDOWS)
     void* handle;
+#elif defined(LINUX)
+	struct EventHandle
+	{
+		pthread_mutex_t mutex;
+		pthread_cond_t cond;
+		bool signaled;
+	};
+    pthread_mutex_t handle;
+
+private:
+	EventHandle m_id;
+#endif
 
 public:
     Event() noexcept;