/[svn]/linuxsampler/trunk/src/common/Mutex.cpp
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Contents of /linuxsampler/trunk/src/common/Mutex.cpp

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Revision 830 - (show annotations) (download)
Sun Jan 15 18:23:11 2006 UTC (14 years, 1 month ago) by persson
File size: 3068 byte(s)
* added linear interpolation of volume modulation inside a
  subfragment; this prevents clicks during voice stealing. Can be
  switched off with the --disable-interpolate-volume configure option.

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 #ifdef HAVE_CONFIG_H
24 # include <config.h>
25 #endif
26
27 #ifndef _GNU_SOURCE
28 # define _GNU_SOURCE 1 /* so _XOPEN_SOURCE will be defined by features.h */
29 #endif
30
31 #ifdef HAVE_FEATURES_H
32 # include <features.h>
33 #endif
34
35 #if !defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 500
36 # undef _XOPEN_SOURCE
37 # define _XOPEN_SOURCE 500 /* to define PTHREAD_MUTEX_ERRORCHECK */
38 # warning "Seems you don't have a UNIX98 compatible system."
39 # warning "Please run LinuxSampler's selftest to make sure this won't be a problem!"
40 # warning "(compile tests with 'make tests', run them with 'src/testcases/linuxsamplertest')"
41 #endif
42
43 #include <iostream>
44 #include <errno.h>
45 #include <stdlib.h> /* for exit(int) */
46
47 #include "Mutex.h"
48
49 Mutex::Mutex() {
50 // the following function call only works on UNIX98 compatible systems
51 #if (_XOPEN_SOURCE > 500)
52 if (pthread_mutexattr_settype(&__posix_mutexattr, PTHREAD_MUTEX_ERRORCHECK)) {
53 std::cout << "Mutex Constructor: Fatal error - unable to pthread_mutexattr_settype(PTHREAD_MUTEX_ERRORCHECK)\n" << std::flush;
54 exit(-1);
55 }
56 #endif
57 pthread_mutex_init(&__posix_mutex, &__posix_mutexattr);
58 }
59
60 Mutex::~Mutex() {
61 pthread_mutex_destroy(&__posix_mutex);
62 }
63
64 void Mutex::Lock() {
65 pthread_mutex_lock(&__posix_mutex);
66 }
67
68 bool Mutex::Trylock() {
69 if (pthread_mutex_trylock(&__posix_mutex) == EBUSY)
70 return false;
71 return true;
72 }
73
74 void Mutex::Unlock() {
75 pthread_mutex_unlock(&__posix_mutex);
76 }

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