src/common/Mutex.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and 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                                                   *
 ***************************************************************************/

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

#include <features.h>

#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"

Mutex::Mutex() {
    // the following function call only works on UNIX98 compatible systems
    #if (_XOPEN_SOURCE > 500)
    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);
}

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);
}
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* *
7	* This program is free software; you can redistribute it and/or modify *
8	* it under the terms of the GNU General Public License as published by *
9	* the Free Software Foundation; either version 2 of the License, or *
10	* (at your option) any later version. *
11	* *
12	* This program is distributed in the hope that it will be useful, *
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
15	* GNU General Public License for more details. *
16	* *
17	* You should have received a copy of the GNU General Public License *
18	* along with this program; if not, write to the Free Software *
19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
20	* MA 02111-1307 USA *
21	***************************************************************************/
22
23	#ifndef _GNU_SOURCE
24	# define _GNU_SOURCE 1 /* so _XOPEN_SOURCE will be defined by features.h */
25	#endif
26
27	#include <features.h>
28
29	#if !defined(_XOPEN_SOURCE) \|\| _XOPEN_SOURCE < 500
30	# undef _XOPEN_SOURCE
31	# define _XOPEN_SOURCE 500 /* to define PTHREAD_MUTEX_ERRORCHECK */
32	# warning "Seems you don't have a UNIX98 compatible system."
33	# warning "Please run LinuxSampler's selftest to make sure this won't be a problem!"
34	# warning "(compile tests with 'make tests', run them with 'src/testcases/linuxsamplertest')"
35	#endif
36
37	#include <iostream>
38	#include <errno.h>
39	#include <stdlib.h> /* for exit(int) */
40
41	#include "Mutex.h"
42
43	Mutex::Mutex() {
44	// the following function call only works on UNIX98 compatible systems
45	#if (_XOPEN_SOURCE > 500)
46	if (pthread_mutexattr_settype(&__posix_mutexattr, PTHREAD_MUTEX_ERRORCHECK)) {
47	std::cout << "Mutex Constructor: Fatal error - unable to pthread_mutexattr_settype(PTHREAD_MUTEX_ERRORCHECK)\n" << std::flush;
48	exit(-1);
49	}
50	#endif
51	pthread_mutex_init(&__posix_mutex, &__posix_mutexattr);
52	}
53
54	Mutex::~Mutex() {
55	pthread_mutex_destroy(&__posix_mutex);
56	}
57
58	void Mutex::Lock() {
59	pthread_mutex_lock(&__posix_mutex);
60	}
61
62	bool Mutex::Trylock() {
63	if (pthread_mutex_trylock(&__posix_mutex) == EBUSY)
64	return false;
65	return true;
66	}
67
68	void Mutex::Unlock() {
69	pthread_mutex_unlock(&__posix_mutex);
70	}