1 files changed, 91 insertions, 0 deletions

diff --git a/src/OSSupport/Semaphore.cpp b/src/OSSupport/Semaphore.cpp
new file mode 100644
index 000000000..468de6858
--- /dev/null
+++ b/src/OSSupport/Semaphore.cpp
@@ -0,0 +1,91 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+
+
+
+
+cSemaphore::cSemaphore( unsigned int a_MaxCount, unsigned int a_InitialCount /* = 0 */ )
+#ifndef _WIN32
+	: m_bNamed( false )
+#endif
+{
+#ifndef _WIN32
+	(void)a_MaxCount;
+	m_Handle = new sem_t;
+	if (sem_init( (sem_t*)m_Handle, 0, 0))
+	{
+		LOG("WARNING cSemaphore: Could not create unnamed semaphore, fallback to named.");
+		delete (sem_t*)m_Handle;    // named semaphores return their own address
+		m_bNamed = true;
+
+		AString Name;
+		Printf(Name, "cSemaphore%p", this );
+		m_Handle = sem_open(Name.c_str(), O_CREAT, 777, a_InitialCount);
+		if( m_Handle == SEM_FAILED )
+		{
+			LOG("ERROR: Could not create Semaphore. (%i)", errno );
+		}
+		else
+		{
+			if( sem_unlink(Name.c_str()) != 0 )
+			{
+				LOG("ERROR: Could not unlink cSemaphore. (%i)", errno);
+			}
+		}
+	}
+#else
+	m_Handle = CreateSemaphore(
+		NULL, // security attribute
+		a_InitialCount, // initial count
+		a_MaxCount, // maximum count
+		0 // name (optional)
+		);
+#endif
+}
+
+cSemaphore::~cSemaphore()
+{
+#ifdef _WIN32
+	CloseHandle( m_Handle );
+#else
+    if( m_bNamed )
+    {
+        if( sem_close( (sem_t*)m_Handle ) != 0 )
+        {
+            LOG("ERROR: Could not close cSemaphore. (%i)", errno);
+        }
+    }
+    else
+    {
+        sem_destroy( (sem_t*)m_Handle );
+        delete (sem_t*)m_Handle;
+    }
+	m_Handle = 0;
+
+#endif
+}
+
+void cSemaphore::Wait()
+{
+#ifndef _WIN32
+    if( sem_wait( (sem_t*)m_Handle ) != 0)
+    {
+        LOG("ERROR: Could not wait for cSemaphore. (%i)", errno);
+    }
+#else
+	WaitForSingleObject( m_Handle, INFINITE);
+#endif
+}
+
+void cSemaphore::Signal()
+{
+#ifndef _WIN32
+	if( sem_post( (sem_t*)m_Handle ) != 0 )
+	{
+        LOG("ERROR: Could not signal cSemaphore. (%i)", errno);
+	}
+#else
+	ReleaseSemaphore( m_Handle, 1, NULL );
+#endif
+}