Added global LAM bool variable (lam_uses_threads) to indicate level

of thread support expected in current job, an inlined macro to access this
parameter, and macros to support locking/unlocking (THREAD_X and X).

This commit was SVN r229.

src/lam/threads/Makefile.am

@@ -17,6 +17,7 @@ headers = \
 
 libthreads_la_SOURCES = \
 	$(headers) \
+    mutex.c \
 	thread.c
 
 # Conditionally install the header files

src/lam/threads/mutex.c

@@ -0,0 +1,8 @@
+/*
+ * $HEADER$
+ */
+
+#include "lam/threads/mutex.h"
+
+bool lam_uses_threads;
+

src/lam/threads/mutex.h

@@ -5,10 +5,33 @@
 #ifndef _MUTEX_H_
 #define _MUTEX_H_
 
+#include "lam_config.h"
+
 #if defined(USE_SPINWAIT)
 #include "lam/threads/mutex_spinwait.h"
 #else
 #include "lam/threads/mutex_spinlock.h"
 #endif
+
+extern bool lam_uses_threads;
+
+static inline bool lam_use_threads() { return lam_uses_threads; }
+
+/*
+ * Lock macros
+ */
+#define THREAD_LOCK(a)   if(lam_use_threads()) \
+                              lam_mtx_lock((a));
+
+#define LOCK(a)          lam_mtx_lock((a))
+
+/*
+ * unlock macros
+ */
+#define THREAD_UNLOCK(a) if(lam_use_threads()) \
+                              lam_mtx_unlock((a));
+
+#define UNLOCK(a)        lam_mtx_unlock((a));
+
 #endif