--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/druntime/import/core/sys/posix/semaphore.d	Tue Jun 02 17:43:06 2009 +0100
@@ -0,0 +1,102 @@
+/**
+ * D header file for POSIX.
+ *
+ * Copyright: Copyright Sean Kelly 2005 - 2009.
+ * License:   <a href="http://www.boost.org/LICENSE_1_0.txt>Boost License 1.0</a>.
+ * Authors:   Sean Kelly
+ * Standards: The Open Group Base Specifications Issue 6, IEEE Std 1003.1, 2004 Edition
+ *
+ *          Copyright Sean Kelly 2005 - 2009.
+ * Distributed under the Boost Software License, Version 1.0.
+ *    (See accompanying file LICENSE_1_0.txt or copy at
+ *          http://www.boost.org/LICENSE_1_0.txt)
+ */
+module core.sys.posix.semaphore;
+
+private import core.sys.posix.config;
+private import core.sys.posix.time;
+
+extern (C):
+
+//
+// Required
+//
+/*
+sem_t
+SEM_FAILED
+
+int sem_close(sem_t*);
+int sem_destroy(sem_t*);
+int sem_getvalue(sem_t*, int*);
+int sem_init(sem_t*, int, uint);
+sem_t* sem_open(in char*, int, ...);
+int sem_post(sem_t*);
+int sem_trywait(sem_t*);
+int sem_unlink(in char*);
+int sem_wait(sem_t*);
+*/
+
+version( linux )
+{
+    private alias int __atomic_lock_t;
+
+    private struct _pthread_fastlock
+    {
+      c_long            __status;
+      __atomic_lock_t   __spinlock;
+    }
+
+    struct sem_t
+    {
+      _pthread_fastlock __sem_lock;
+      int               __sem_value;
+      void*             __sem_waiting;
+    }
+
+    enum SEM_FAILED = cast(sem_t*) null;
+}
+else version( OSX )
+{
+    alias int sem_t;
+
+    enum SEM_FAILED = cast(sem_t*) null;
+}
+else version( freebsd )
+{
+    enum SEM_MAGIC  = 0x09fa4012;
+    enum SEM_USER   = 0;
+
+    alias void* sem_t;
+
+    enum SEM_FAILED = cast(sem_t*) null;
+}
+
+int sem_close(sem_t*);
+int sem_destroy(sem_t*);
+int sem_getvalue(sem_t*, int*);
+int sem_init(sem_t*, int, uint);
+sem_t* sem_open(in char*, int, ...);
+int sem_post(sem_t*);
+int sem_trywait(sem_t*);
+int sem_unlink(in char*);
+int sem_wait(sem_t*);
+
+//
+// Timeouts (TMO)
+//
+/*
+int sem_timedwait(sem_t*, in timespec*);
+*/
+
+version( linux )
+{
+    int sem_timedwait(sem_t*, in timespec*);
+}
+else version( OSX )
+{
+    int sem_timedwait(sem_t*, in timespec*);
+}
+else version( freebsd )
+{
+    int sem_timedwait(sem_t*, in timespec*);
+}