Add a couple of pthread helper macros

(to accommodate the fact that in ptw-win32, 'pthread_t' is subtlely different from its non-Windows counterparts)

libs/backends/wavesaudio/wavesapi/miscutils/pthread_utils.h

@@ -0,0 +1,38 @@
+/*
+    Copyright (C) 2014 John Emmas 
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __waves_pthread_utils__
+#define __waves_pthread_utils__
+
+/* Accommodate thread setting (and testing) for both
+ * 'libpthread' and 'libpthread_win32' (whose implementations
+ * of 'pthread_t' are subtlely different)
+ */
+#ifndef PTHREAD_MACROS_DEFINED
+#define PTHREAD_MACROS_DEFINED
+#ifdef  PTW32_VERSION  /* pthread_win32 */
+#define mark_pthread_inactive(threadID)  threadID.p=0
+#define is_pthread_active(threadID)      threadID.p==0
+#else                 /* normal pthread */
+#define mark_pthread_inactive(threadID)  threadID=0
+#define is_pthread_active(threadID)      threadID==0
+#endif  /* PTW32_VERSION */
+
+#endif  /* PTHREAD_MACROS_DEFINED */
+#endif  /* __waves_pthread_utils__ */