--- linuxsampler/trunk/src/common/Mutex.cpp	2004/04/27 09:21:58	56
+++ linuxsampler/trunk/src/common/Mutex.cpp	2004/10/20 03:02:35	290
@@ -20,11 +20,28 @@
  *   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 (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);
@@ -40,6 +57,12 @@
     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);
 }