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	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	senoner	1481	#if !defined(WIN32)
37	schoenebeck	289	#if !defined(_XOPEN_SOURCE) \|\| _XOPEN_SOURCE < 500
38			# undef _XOPEN_SOURCE
39			# define _XOPEN_SOURCE 500 /* to define PTHREAD_MUTEX_ERRORCHECK */
40	senkov	290	# 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	schoenebeck	289	#endif
44	senoner	1481	#endif
45	schoenebeck	289
46	schoenebeck	53	#include <iostream>
47	capela	268	#include <errno.h>
48	schoenebeck	281	#include <stdlib.h> /* for exit(int) */
49	capela	268
50	schoenebeck	53	#include "Mutex.h"
51
52	schoenebeck	880	namespace LinuxSampler {
53
54	schoenebeck	53	Mutex::Mutex() {
55	senoner	1481	#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	persson	932	pthread_mutexattr_init(&__posix_mutexattr);
63
64	schoenebeck	275	// the following function call only works on UNIX98 compatible systems
65	schoenebeck	1149	#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	schoenebeck	53	if (pthread_mutexattr_settype(&__posix_mutexattr, PTHREAD_MUTEX_ERRORCHECK)) {
72	senoner	1481	std::cerr << "Mutex Constructor: Fatal error - unable to pthread_mutexattr_settype(PTHREAD_MUTEX_ERRORCHECK)\n" << std::flush;
73	schoenebeck	53	exit(-1);
74			}
75	schoenebeck	361	#endif
76	schoenebeck	53	pthread_mutex_init(&__posix_mutex, &__posix_mutexattr);
77	senoner	1481	#endif
78	schoenebeck	53	}
79
80			Mutex::~Mutex() {
81	senoner	1481	#if defined(WIN32)
82			CloseHandle(hMutex);
83			#else
84	schoenebeck	53	pthread_mutex_destroy(&__posix_mutex);
85	persson	932	pthread_mutexattr_destroy(&__posix_mutexattr);
86	senoner	1481	#endif
87	schoenebeck	53	}
88
89			void Mutex::Lock() {
90	senoner	1481	#if defined(WIN32)
91			WaitForSingleObject(hMutex, INFINITE);
92			#else
93	schoenebeck	53	pthread_mutex_lock(&__posix_mutex);
94	senoner	1481	#endif
95	schoenebeck	53	}
96
97	senkov	165	bool Mutex::Trylock() {
98	senoner	1481	#if defined(WIN32)
99			if( WaitForSingleObject(hMutex, 0) == WAIT_TIMEOUT) return false;
100			return true;
101			#else
102	senkov	165	if (pthread_mutex_trylock(&__posix_mutex) == EBUSY)
103	senoner	1481	return false;
104	senkov	165	return true;
105	senoner	1481	#endif
106	senkov	165	}
107
108	schoenebeck	53	void Mutex::Unlock() {
109	senoner	1481	#if defined(WIN32)
110			ReleaseMutex(hMutex);
111			#else
112	schoenebeck	53	pthread_mutex_unlock(&__posix_mutex);
113	senoner	1481	#endif
114	schoenebeck	53	}
115	schoenebeck	880
116			} // namespace LinuxSampler