add possibility to enable recursive mutex support for pthread

git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@828 7ec92016-0320-0410-acc4-a06ded1c099a

CHANGES

@@ -11,6 +11,9 @@ General:
     - Added more unit tests (rs)
     - Several other bug fixes (rs, pk)
 
+Threads:
+    - add possibility to enable recursive mutex support for pthread (pk)
+
 CVS commits by Lukas Fittl (lf), Peter Kümmel (pk), Rich Sposato (rs)
 
 _____________________________________

include/loki/Threads.h

@@ -89,6 +89,7 @@
 #define LOKI_THREADS_MUTEX_LOCK(x)      ::EnterCriticalSection (x)
 #define LOKI_THREADS_MUTEX_UNLOCK(x)    ::LeaveCriticalSection (x)
 #define LOKI_THREADS_LONG               LONG
+#define LOKI_THREADS_MUTEX_CTOR(x)
 
 #define LOKI_THREADS_ATOMIC_FUNCTIONS                                   \
         static IntType AtomicIncrement(volatile IntType& lval)          \
@@ -110,9 +111,17 @@
 
 #define LOKI_THREADS_MUTEX(x)           pthread_mutex_t (x);
 
-// no recursive mutex support
 #define LOKI_THREADS_MUTEX_INIT(x)      ::pthread_mutex_init(x, 0)
 
+// define to 1 to enable recursive mutex support
+#if 0
+// experimental recursive mutex support
+#define LOKI_THREADS_MUTEX_CTOR(x)      : x(PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP)
+#else
+// no recursive mutex support
+#define LOKI_THREADS_MUTEX_CTOR(x)
+#endif
+
 #define LOKI_THREADS_MUTEX_DELETE(x)    ::pthread_mutex_destroy (x)
 #define LOKI_THREADS_MUTEX_LOCK(x)      ::pthread_mutex_lock (x)
 #define LOKI_THREADS_MUTEX_UNLOCK(x)    ::pthread_mutex_unlock (x)
@@ -147,6 +156,7 @@
 #define LOKI_THREADS_MUTEX_LOCK(x)         
 #define LOKI_THREADS_MUTEX_UNLOCK(x)       
 #define LOKI_THREADS_LONG               
+#define LOKI_THREADS_MUTEX_CTOR(x)
 
 #endif
 
@@ -165,7 +175,7 @@ namespace Loki
     class Mutex
     {
     public:
-        Mutex()
+        Mutex() LOKI_THREADS_MUTEX_CTOR(mtx_)
         {
             LOKI_THREADS_MUTEX_INIT(&mtx_);
         }