70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
/*
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Copyright (C) 2010 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __pbd_semutils_h__
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#define __pbd_semutils_h__
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#if (defined PLATFORM_WINDOWS && !defined USE_PTW32_SEMAPHORE)
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#define WINDOWS_SEMAPHORE 1
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#endif
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#ifdef WINDOWS_SEMAPHORE
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#include <windows.h>
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#else
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#include <pthread.h>
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#include <semaphore.h>
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#endif
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#include "pbd/libpbd_visibility.h"
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namespace PBD {
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class LIBPBD_API Semaphore {
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private:
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#ifdef WINDOWS_SEMAPHORE
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HANDLE _sem;
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#elif __APPLE__
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sem_t* _sem;
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sem_t* ptr_to_sem() const { return _sem; }
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#else
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mutable sem_t _sem;
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sem_t* ptr_to_sem() const { return &_sem; }
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#endif
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public:
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Semaphore (const char* name, int val);
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~Semaphore ();
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#ifdef WINDOWS_SEMAPHORE
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int signal ();
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int wait ();
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int reset ();
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#else
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int signal () { return sem_post (ptr_to_sem()); }
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int wait () { return sem_wait (ptr_to_sem()); }
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int reset () { int rv = 0 ; while (sem_trywait (ptr_to_sem()) == 0) ++rv; return rv; }
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#endif
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};
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}
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#endif /* __pbd_semutils_h__ */
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