src/common/Mutex.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 - 2007 Christian Schoenebeck                       *
 *                                                                         *
 *   This program 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.                                   *
 *                                                                         *
 *   This program 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 more 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., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#ifndef _GNU_SOURCE
# define _GNU_SOURCE 1 /* so _XOPEN_SOURCE will be defined by features.h */
#endif

#ifdef HAVE_FEATURES_H
# include <features.h>
#endif

#if !defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 500
# undef _XOPEN_SOURCE
# define _XOPEN_SOURCE 500 /* to define PTHREAD_MUTEX_ERRORCHECK */
# warning "Seems you don't have a UNIX98 compatible system."
# warning "Please run LinuxSampler's selftest to make sure this won't be a problem!"
# warning "(compile tests with 'make tests', run them with 'src/testcases/linuxsamplertest')"
#endif

#include <iostream>
#include <errno.h>
#include <stdlib.h> /* for exit(int) */

#include "Mutex.h"

namespace LinuxSampler {

Mutex::Mutex() {
    pthread_mutexattr_init(&__posix_mutexattr);

    // the following function call only works on UNIX98 compatible systems
    #if (_XOPEN_SOURCE > 500) || defined(__APPLE__)
        // Mac OS X Note: 10.4 (and later) does support PTHREAD_MUTEX_ERRORCHECK, and
        // actually LinuxSampler does not work if this call is omitted. However,
        // defining _XOPEN_SOURCE macro seems to cause other problems. As a workaround,
        // the symbol __APPLE__ is checked here. There should be a better solution
        // to this problem. (Toshi Nagata, 27 Mar 2007)
    if (pthread_mutexattr_settype(&__posix_mutexattr, PTHREAD_MUTEX_ERRORCHECK)) {
        std::cout << "Mutex Constructor: Fatal error - unable to pthread_mutexattr_settype(PTHREAD_MUTEX_ERRORCHECK)\n" << std::flush;
        exit(-1);
    }
    #endif
    pthread_mutex_init(&__posix_mutex, &__posix_mutexattr);
}

Mutex::~Mutex() {
    pthread_mutex_destroy(&__posix_mutex);
    pthread_mutexattr_destroy(&__posix_mutexattr);
}

void Mutex::Lock() {
    pthread_mutex_lock(&__posix_mutex);
}

bool Mutex::Trylock() {
    if (pthread_mutex_trylock(&__posix_mutex) == EBUSY)
            return false;
    return true;
}

void Mutex::Unlock() {
    pthread_mutex_unlock(&__posix_mutex);
}

} // namespace LinuxSampler
1	schoenebeck	53	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5	schoenebeck	56	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	schoenebeck	1149	* Copyright (C) 2005 - 2007 Christian Schoenebeck *
7	schoenebeck	53	* *
8			* This program is free software; you can redistribute it and/or modify *
9			* it under the terms of the GNU General Public License as published by *
10			* the Free Software Foundation; either version 2 of the License, or *
11			* (at your option) any later version. *
12			* *
13			* This program is distributed in the hope that it will be useful, *
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16			* GNU General Public License for more details. *
17			* *
18			* You should have received a copy of the GNU General Public License *
19			* along with this program; if not, write to the Free Software *
20			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21			* MA 02111-1307 USA *
22			***************************************************************************/
23
24	persson	830	#ifdef HAVE_CONFIG_H
25			# include <config.h>
26			#endif
27
28	schoenebeck	289	#ifndef _GNU_SOURCE
29			# define _GNU_SOURCE 1 /* so _XOPEN_SOURCE will be defined by features.h */
30			#endif
31
32	persson	830	#ifdef HAVE_FEATURES_H
33	wylder	819	# include <features.h>
34			#endif
35	schoenebeck	289
36			#if !defined(_XOPEN_SOURCE) \|\| _XOPEN_SOURCE < 500
37			# undef _XOPEN_SOURCE
38			# define _XOPEN_SOURCE 500 /* to define PTHREAD_MUTEX_ERRORCHECK */
39	senkov	290	# warning "Seems you don't have a UNIX98 compatible system."
40			# warning "Please run LinuxSampler's selftest to make sure this won't be a problem!"
41			# warning "(compile tests with 'make tests', run them with 'src/testcases/linuxsamplertest')"
42	schoenebeck	289	#endif
43
44	schoenebeck	53	#include <iostream>
45	capela	268	#include <errno.h>
46	schoenebeck	281	#include <stdlib.h> /* for exit(int) */
47	capela	268
48	schoenebeck	53	#include "Mutex.h"
49
50	schoenebeck	880	namespace LinuxSampler {
51
52	schoenebeck	53	Mutex::Mutex() {
53	persson	932	pthread_mutexattr_init(&__posix_mutexattr);
54
55	schoenebeck	275	// the following function call only works on UNIX98 compatible systems
56	schoenebeck	1149	#if (_XOPEN_SOURCE > 500) \|\| defined(__APPLE__)
57			// Mac OS X Note: 10.4 (and later) does support PTHREAD_MUTEX_ERRORCHECK, and
58			// actually LinuxSampler does not work if this call is omitted. However,
59			// defining _XOPEN_SOURCE macro seems to cause other problems. As a workaround,
60			// the symbol __APPLE__ is checked here. There should be a better solution
61			// to this problem. (Toshi Nagata, 27 Mar 2007)
62	schoenebeck	53	if (pthread_mutexattr_settype(&__posix_mutexattr, PTHREAD_MUTEX_ERRORCHECK)) {
63			std::cout << "Mutex Constructor: Fatal error - unable to pthread_mutexattr_settype(PTHREAD_MUTEX_ERRORCHECK)\n" << std::flush;
64			exit(-1);
65			}
66	schoenebeck	361	#endif
67	schoenebeck	53	pthread_mutex_init(&__posix_mutex, &__posix_mutexattr);
68			}
69
70			Mutex::~Mutex() {
71			pthread_mutex_destroy(&__posix_mutex);
72	persson	932	pthread_mutexattr_destroy(&__posix_mutexattr);
73	schoenebeck	53	}
74
75			void Mutex::Lock() {
76			pthread_mutex_lock(&__posix_mutex);
77			}
78
79	senkov	165	bool Mutex::Trylock() {
80			if (pthread_mutex_trylock(&__posix_mutex) == EBUSY)
81			return false;
82			return true;
83			}
84
85	schoenebeck	53	void Mutex::Unlock() {
86			pthread_mutex_unlock(&__posix_mutex);
87			}
88	schoenebeck	880
89			} // namespace LinuxSampler