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-rw-r--r--src/common/util/Semaphore.h63
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diff --git a/src/common/util/Semaphore.h b/src/common/util/Semaphore.h
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--- a/src/common/util/Semaphore.h
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-/* This file is part of Ingen. Copyright (C) 2006 Dave Robillard.
- *
- * Ingen is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation; either version 2 of the License, or (at your option) any later
- * version.
- *
- * Ingen 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 GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef SEMAPHORE_H
-#define SEMAPHORE_H
-
-#include <semaphore.h>
-
-
-/** Trivial wrapper around POSIX semaphores (zero memory overhead).
- *
- * This was created to provide an alternative debuggable implementation of
- * semaphores based on a cond/mutex pair because semaphore's appeared not to
- * work in GDB. Turns out sem_wait can fail when run in GDB, and Debian
- * really needs to update it's man pages.
- *
- * This class remains as a trivial (yet pretty) wrapper/abstraction.
- */
-class Semaphore {
-public:
- inline Semaphore(unsigned int initial) { sem_init(&m_sem, 0, initial); }
-
- inline ~Semaphore() { sem_destroy(&m_sem); }
-
- /** Increment (and signal any waiters).
- *
- * Realtime safe.
- */
- inline void post() { sem_post(&m_sem); }
-
- /** Wait until count is > 0, then decrement.
- *
- * Note that sem_wait always returns 0 in practise. It returns nonzero
- * when run in GDB, so the while is necessary to allow debugging.
- *
- * Obviously not realtime safe.
- */
- inline void wait() { while (sem_wait(&m_sem) != 0) ; }
-
- /** Non-blocking version of wait().
- *
- * Realtime safe?
- */
- inline int try_wait() { return sem_trywait(&m_sem); }
-private:
- sem_t m_sem;
-};
-
-
-#endif // SEMAPHORE_H