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(WIN32)
#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
#endif

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

#include "Mutex.h"

namespace LinuxSampler {

Mutex::Mutex() {
#if defined(WIN32)
    hMutex = CreateMutex( NULL, FALSE, NULL);
    if (hMutex == NULL) {
        std::cerr << "Mutex Constructor: Fatal error - CreateMutex error " << GetLastError() << "\n";
        exit(1);
    }
#else
    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::cerr << "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);
#endif
}

Mutex::~Mutex() {
#if defined(WIN32)
    CloseHandle(hMutex);
#else
    pthread_mutex_destroy(&__posix_mutex);
    pthread_mutexattr_destroy(&__posix_mutexattr);
#endif
}

void Mutex::Lock() {
#if defined(WIN32)
    WaitForSingleObject(hMutex, INFINITE);
#else
    pthread_mutex_lock(&__posix_mutex);
#endif
}

bool Mutex::Trylock() {
#if defined(WIN32)
    if( WaitForSingleObject(hMutex, 0) == WAIT_TIMEOUT) return false;
    return true;
#else
    if (pthread_mutex_trylock(&__posix_mutex) == EBUSY)
        return false;
    return true;
#endif
}

void Mutex::Unlock() {
#if defined(WIN32)
    ReleaseMutex(hMutex);
#else
    pthread_mutex_unlock(&__posix_mutex);
#endif
}

} // namespace LinuxSampler
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005 - 2007 Christian Schoenebeck *
7	* *
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	#ifdef HAVE_CONFIG_H
25	# include <config.h>
26	#endif
27
28	#ifndef _GNU_SOURCE
29	# define _GNU_SOURCE 1 /* so _XOPEN_SOURCE will be defined by features.h */
30	#endif
31
32	#ifdef HAVE_FEATURES_H
33	# include <features.h>
34	#endif
35
36	#if !defined(WIN32)
37	#if !defined(_XOPEN_SOURCE) \|\| _XOPEN_SOURCE < 500
38	# undef _XOPEN_SOURCE
39	# define _XOPEN_SOURCE 500 /* to define PTHREAD_MUTEX_ERRORCHECK */
40	# warning "Seems you don't have a UNIX98 compatible system."
41	# warning "Please run LinuxSampler's selftest to make sure this won't be a problem!"
42	# warning "(compile tests with 'make tests', run them with 'src/testcases/linuxsamplertest')"
43	#endif
44	#endif
45
46	#include <iostream>
47	#include <errno.h>
48	#include <stdlib.h> /* for exit(int) */
49
50	#include "Mutex.h"
51
52	namespace LinuxSampler {
53
54	Mutex::Mutex() {
55	#if defined(WIN32)
56	hMutex = CreateMutex( NULL, FALSE, NULL);
57	if (hMutex == NULL) {
58	std::cerr << "Mutex Constructor: Fatal error - CreateMutex error " << GetLastError() << "\n";
59	exit(1);
60	}
61	#else
62	pthread_mutexattr_init(&__posix_mutexattr);
63
64	// the following function call only works on UNIX98 compatible systems
65	#if (_XOPEN_SOURCE > 500) \|\| defined(__APPLE__)
66	// Mac OS X Note: 10.4 (and later) does support PTHREAD_MUTEX_ERRORCHECK, and
67	// actually LinuxSampler does not work if this call is omitted. However,
68	// defining _XOPEN_SOURCE macro seems to cause other problems. As a workaround,
69	// the symbol __APPLE__ is checked here. There should be a better solution
70	// to this problem. (Toshi Nagata, 27 Mar 2007)
71	if (pthread_mutexattr_settype(&__posix_mutexattr, PTHREAD_MUTEX_ERRORCHECK)) {
72	std::cerr << "Mutex Constructor: Fatal error - unable to pthread_mutexattr_settype(PTHREAD_MUTEX_ERRORCHECK)\n" << std::flush;
73	exit(-1);
74	}
75	#endif
76	pthread_mutex_init(&__posix_mutex, &__posix_mutexattr);
77	#endif
78	}
79
80	Mutex::~Mutex() {
81	#if defined(WIN32)
82	CloseHandle(hMutex);
83	#else
84	pthread_mutex_destroy(&__posix_mutex);
85	pthread_mutexattr_destroy(&__posix_mutexattr);
86	#endif
87	}
88
89	void Mutex::Lock() {
90	#if defined(WIN32)
91	WaitForSingleObject(hMutex, INFINITE);
92	#else
93	pthread_mutex_lock(&__posix_mutex);
94	#endif
95	}
96
97	bool Mutex::Trylock() {
98	#if defined(WIN32)
99	if( WaitForSingleObject(hMutex, 0) == WAIT_TIMEOUT) return false;
100	return true;
101	#else
102	if (pthread_mutex_trylock(&__posix_mutex) == EBUSY)
103	return false;
104	return true;
105	#endif
106	}
107
108	void Mutex::Unlock() {
109	#if defined(WIN32)
110	ReleaseMutex(hMutex);
111	#else
112	pthread_mutex_unlock(&__posix_mutex);
113	#endif
114	}
115
116	} // namespace LinuxSampler