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/*************************************************************************** |
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* * |
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* LinuxSampler - modular, streaming capable sampler * |
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* * |
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* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
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* Copyright (C) 2005 - 2016 Christian Schoenebeck * |
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* * |
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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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* * |
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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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* * |
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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., 59 Temple Place, Suite 330, Boston, * |
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* MA 02111-1307 USA * |
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***************************************************************************/ |
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|
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#ifdef HAVE_CONFIG_H |
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# include <config.h> |
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#endif |
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|
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#if AC_APPLE_UNIVERSAL_BUILD // maybe do this include for all Apple ones (defined(__APPLE__))? |
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# include <sys/cdefs.h> // defines the system macros checked below |
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#endif |
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|
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#ifndef _GNU_SOURCE |
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# define _GNU_SOURCE 1 /* so _XOPEN_SOURCE will be defined by features.h */ |
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#endif |
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|
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#ifdef HAVE_FEATURES_H |
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# include <features.h> |
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#endif |
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|
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#if !defined(WIN32) |
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# if !defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 500 |
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# undef _XOPEN_SOURCE |
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# define _XOPEN_SOURCE 500 /* to define PTHREAD_MUTEX_ERRORCHECK */ |
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# if (!defined(POSIX_C_SOURCE) || POSIX_C_SOURCE < 199801L) && !defined(__DARWIN_UNIX03) |
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# warning "Seems you don't have a UNIX98 compatible system." |
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# warning "Please run LinuxSampler's selftest to make sure this won't be a problem!" |
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# warning "(compile tests with 'make tests', run them with 'src/testcases/linuxsamplertest')" |
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# endif |
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# endif |
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#endif |
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|
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#include <iostream> |
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#include <errno.h> |
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#include <stdlib.h> /* for exit(int) */ |
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|
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#include "Mutex.h" |
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|
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namespace LinuxSampler { |
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|
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Mutex::Mutex() { |
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#if defined(WIN32) |
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hMutex = CreateMutex( NULL, FALSE, NULL); |
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if (hMutex == NULL) { |
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std::cerr << "Mutex Constructor: Fatal error - CreateMutex error " << GetLastError() << "\n"; |
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exit(1); |
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} |
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#else |
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pthread_mutexattr_init(&__posix_mutexattr); |
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|
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// the following function call only works on UNIX98 compatible systems |
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#if (_XOPEN_SOURCE > 500) || defined(__APPLE__) |
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// Mac OS X Note: 10.4 (and later) does support PTHREAD_MUTEX_ERRORCHECK, and |
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// actually LinuxSampler does not work if this call is omitted. However, |
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// defining _XOPEN_SOURCE macro seems to cause other problems. As a workaround, |
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// the symbol __APPLE__ is checked here. There should be a better solution |
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// to this problem. (Toshi Nagata, 27 Mar 2007) |
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if (pthread_mutexattr_settype(&__posix_mutexattr, PTHREAD_MUTEX_ERRORCHECK)) { |
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std::cerr << "Mutex Constructor: Fatal error - unable to pthread_mutexattr_settype(PTHREAD_MUTEX_ERRORCHECK)\n" << std::flush; |
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exit(-1); |
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} |
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#endif |
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pthread_mutex_init(&__posix_mutex, &__posix_mutexattr); |
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#endif |
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} |
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|
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Mutex::~Mutex() { |
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#if defined(WIN32) |
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CloseHandle(hMutex); |
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#else |
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pthread_mutex_destroy(&__posix_mutex); |
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pthread_mutexattr_destroy(&__posix_mutexattr); |
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#endif |
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} |
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|
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void Mutex::Lock() { |
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#if defined(WIN32) |
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WaitForSingleObject(hMutex, INFINITE); |
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#else |
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pthread_mutex_lock(&__posix_mutex); |
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#endif |
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} |
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|
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bool Mutex::Trylock() { |
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#if defined(WIN32) |
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if( WaitForSingleObject(hMutex, 0) == WAIT_TIMEOUT) return false; |
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return true; |
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#else |
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if (pthread_mutex_trylock(&__posix_mutex) == EBUSY) |
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return false; |
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return true; |
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#endif |
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} |
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|
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void Mutex::Unlock() { |
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#if defined(WIN32) |
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ReleaseMutex(hMutex); |
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#else |
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pthread_mutex_unlock(&__posix_mutex); |
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#endif |
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} |
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|
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} // namespace LinuxSampler |
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