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@@ -0,0 +1,122 @@
+#ifndef CYGONCE_KERNEL_SEMA_HXX
+#define CYGONCE_KERNEL_SEMA_HXX
+
+//==========================================================================
+//
+//	sema.hxx
+//
+//	Semaphore class declarations
+//
+//==========================================================================
+//####COPYRIGHTBEGIN####
+//
+// -------------------------------------------
+// The contents of this file are subject to the Cygnus eCos Public License
+// Version 1.0 (the "License"); you may not use this file except in
+// compliance with the License.  You may obtain a copy of the License at
+// http://sourceware.cygnus.com/ecos
+// 
+// Software distributed under the License is distributed on an "AS IS"
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the
+// License for the specific language governing rights and limitations under
+// the License.
+// 
+// The Original Code is eCos - Embedded Cygnus Operating System, released
+// September 30, 1998.
+// 
+// The Initial Developer of the Original Code is Cygnus.  Portions created
+// by Cygnus are Copyright (C) 1998 Cygnus Solutions.  All Rights Reserved.
+// -------------------------------------------
+//
+//####COPYRIGHTEND####
+//==========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s): 	nickg
+// Contributors:	nickg
+// Date:	1997-09-09
+// Purpose:	Define Semaphore class interfaces
+// Description:	The classes defined here provide the APIs for binary
+//              and counting semaphores.
+// Usage:	#include <cyg/kernel/sema.hxx>
+//		
+//
+//####DESCRIPTIONEND####
+//
+//==========================================================================
+
+#include <cyg/kernel/ktypes.h>
+#include <cyg/infra/cyg_ass.h>         // assertion macros
+#include <cyg/kernel/thread.hxx>
+
+// -------------------------------------------------------------------------
+// Binary semaphore. This has only two states: posted and not-posted.
+
+class Cyg_Binary_Semaphore
+{
+    cyg_bool            state;          // The binary semaphore state
+
+    Cyg_ThreadQueue     queue;          // Queue of waiting threads
+
+public:
+
+    CYGDBG_DEFINE_CHECK_THIS
+    
+    Cyg_Binary_Semaphore(               // Constructor
+        cyg_bool init_state = false     // Initial state value
+        );
+
+    ~Cyg_Binary_Semaphore();            // Destructor
+        
+    cyg_bool    wait();                 // Wait until state == true
+
+    cyg_bool    trywait();              // Set state false if possible
+        
+    void        post();                 // Increment count
+
+    cyg_bool    posted();               // Get current state
+    
+};
+
+// -------------------------------------------------------------------------
+// Counting semaphore. This implements the usual counter based semaphore.
+
+class Cyg_Counting_Semaphore
+{
+    cyg_count32         count;          // The semaphore count
+
+    Cyg_ThreadQueue     queue;          // Queue of waiting threads
+
+public:
+
+    CYGDBG_DEFINE_CHECK_THIS
+    
+    Cyg_Counting_Semaphore(             // Constructor
+        cyg_count32 init_count = 0      // Initial count value
+        );
+
+    ~Cyg_Counting_Semaphore();          // Destructor
+        
+    cyg_bool    wait();                 // Wait until decrement
+
+#ifdef CYGFUN_KERNEL_THREADS_TIMER
+    cyg_bool    wait( cyg_tick_count timeout );
+#endif                                  // Wait until decrement or timeout
+
+    cyg_bool    trywait();              // Try to decrement
+        
+    void        post();                 // Increment count
+
+    cyg_count32 peek();                 // Get current count value
+    
+    inline
+    cyg_bool	waiting()               // Is anyone waiting?
+    {
+        return !queue.empty();
+    }
+
+};
+
+// -------------------------------------------------------------------------
+#endif // ifndef CYGONCE_KERNEL_SEMA_HXX
+// EOF sema.hxx