From 30cb85c307b4c1273791721a782337742ade222c Mon Sep 17 00:00:00 2001 From: David Robillard Date: Wed, 4 Oct 2006 21:45:20 +0000 Subject: Moved generic utility stuff to new library "raul". git-svn-id: http://svn.drobilla.net/lad/ingen@156 a436a847-0d15-0410-975c-d299462d15a1 --- src/common/util/Semaphore.h | 63 --------------------------------------------- 1 file changed, 63 deletions(-) delete mode 100644 src/common/util/Semaphore.h (limited to 'src/common/util/Semaphore.h') diff --git a/src/common/util/Semaphore.h b/src/common/util/Semaphore.h deleted file mode 100644 index 168a7059..00000000 --- a/src/common/util/Semaphore.h +++ /dev/null @@ -1,63 +0,0 @@ -/* 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 - - -/** 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 -- cgit v1.2.1