--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/druntime/import/core/sys/osx/mach/semaphore.d	Tue Jun 02 17:43:06 2009 +0100
@@ -0,0 +1,54 @@
+/**
+ * D header file for OSX.
+ *
+ * Copyright: Copyright Sean Kelly 2008 - 2009.
+ * License:   <a href="http://www.boost.org/LICENSE_1_0.txt>Boost License 1.0</a>.
+ * Authors:   Sean Kelly
+ *
+ *          Copyright Sean Kelly 2008 - 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.osx.mach.semaphore;
+
+public import core.sys.osx.mach.kern_return;
+public import core.sys.osx.mach.port;
+
+extern (C):
+
+alias mach_port_t   task_t;
+alias mach_port_t   thread_t;
+alias mach_port_t   semaphore_t;
+alias int           sync_policy_t;
+
+alias int clock_res_t;
+struct mach_timespec_t
+{
+	uint	    tv_sec;
+	clock_res_t	tv_nsec;
+}
+
+enum
+{
+    SYNC_POLICY_FIFO            = 0x0,
+    SYNC_POLICY_FIXED_PRIORITY  = 0x1,
+    SYNC_POLICY_REVERSED        = 0x2,
+    SYNC_POLICY_ORDER_MASK      = 0x3,
+    SYNC_POLICY_LIFO            = (SYNC_POLICY_FIFO | SYNC_POLICY_REVERSED),
+    SYNC_POLICY_MAX			    = 0x7,
+}
+
+task_t        mach_task_self();
+kern_return_t semaphore_create(task_t, semaphore_t*, int, int);
+kern_return_t semaphore_destroy(task_t, semaphore_t);
+    
+kern_return_t semaphore_signal(semaphore_t);
+kern_return_t semaphore_signal_all(semaphore_t);
+kern_return_t semaphore_signal_thread(semaphore_t, thread_t);
+
+kern_return_t semaphore_wait(semaphore_t);
+kern_return_t semaphore_wait_signal(semaphore_t, semaphore_t);
+
+kern_return_t semaphore_timedwait(semaphore_t, mach_timespec_t);
+kern_return_t semaphore_timedwait_signal(semaphore_t, semaphore_t, mach_timespec_t);