1 files changed, 135 insertions, 0 deletions
diff --git a/src/semaphore.hpp b/src/semaphore.hpp
new file mode 100644
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+++ b/src/semaphore.hpp
@@ -0,0 +1,135 @@
+/*
+    Copyright (c) 2007-2010 iMatix Corporation
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_SEMAPHORE_HPP_INCLUDED__
+#define __ZMQ_SEMAPHORE_HPP_INCLUDED__
+
+#include "platform.hpp"
+#include "err.hpp"
+
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#else
+#include <semaphore.h>
+#endif
+
+namespace zmq
+{
+    //  Simple semaphore. Only single thread may be waiting at any given time.
+    //  Also, the semaphore may not be posted before the previous post
+    //  was matched by corresponding wait and the waiting thread was
+    //  released.
+
+#if defined ZMQ_HAVE_WINDOWS
+
+    //  On Windows platform simple semaphore is implemeted using event object.
+
+    class semaphore_t
+    { 
+    public:
+
+        //  Initialise the semaphore.
+        inline semaphore_t ()
+        {
+            ev = CreateEvent (NULL, FALSE, FALSE, NULL);
+            win_assert (ev != NULL);
+        }
+
+        //  Destroy the semaphore.
+        inline ~semaphore_t ()
+        {
+            int rc = CloseHandle (ev);
+            win_assert (rc != 0);    
+        }
+
+        //  Wait for the semaphore.
+        inline void wait ()
+        {
+            DWORD rc = WaitForSingleObject (ev, INFINITE);
+            win_assert (rc != WAIT_FAILED);
+        }
+
+        //  Post the semaphore.
+        inline void post ()
+        {
+            int rc = SetEvent (ev);
+            win_assert (rc != 0);
+        }
+
+    private:
+
+        HANDLE ev;
+
+        //  Disable copying of the object.
+        semaphore_t (const semaphore_t&);
+        void operator = (const semaphore_t&);
+    };
+
+#else
+
+    //  Default implementation maps simple semaphore to POSIX semaphore.
+
+    class semaphore_t
+    { 
+    public:
+
+        //  Initialise the semaphore.
+        inline semaphore_t ()
+        {
+             int rc = sem_init (&sem, 0, 0);
+             errno_assert (rc != -1);
+        }
+
+        //  Destroy the semaphore.
+        inline ~semaphore_t ()
+        {
+             int rc = sem_destroy (&sem);
+             errno_assert (rc != -1);
+        }
+
+        //  Wait for the semaphore.
+        inline void wait ()
+        {
+             int rc = sem_wait (&sem);
+             errno_assert (rc != -1);
+        }
+
+        //  Post the semaphore.
+        inline void post ()
+        {
+            int rc = sem_post (&sem);
+            errno_assert (rc != -1);
+        }
+
+    private:
+
+        //  Underlying system semaphore object.
+        sem_t sem;
+
+        //  Disable copying of the object.
+        semaphore_t (const semaphore_t&);
+        void operator = (const semaphore_t&);
+    };
+
+#endif
+
+}
+
+#endif
+