UNDO: Always check the result of pthread_mutex_lock() and pthread_mutex_unlock().

[ghc-hetmet.git] / includes / OSThreads.h

diff --git a/includes/OSThreads.h b/includes/OSThreads.h
index fd57f56..d79b9af 100644 (file)
--- a/includes/OSThreads.h
+++ b/includes/OSThreads.h
@@ -23,7 +23,6 @@
 #else
 
 #include <pthread.h>
-#include <errno.h>
 
 typedef pthread_cond_t  Condition;
 typedef pthread_mutex_t Mutex;
@@ -35,27 +34,48 @@ typedef pthread_key_t   ThreadLocalKey;
 #define INIT_COND_VAR       PTHREAD_COND_INITIALIZER
 
 #ifdef LOCK_DEBUG
-#define LOCK_DEBUG_BELCH(what, mutex) \
-  debugBelch("%s(0x%p) %s %d\n", what, mutex, __FILE__, __LINE__)
-#else
-#define LOCK_DEBUG_BELCH(what, mutex) /* nothing */
-#endif
 
-/* Always check the result of lock and unlock. */
 #define ACQUIRE_LOCK(mutex) \
-  LOCK_DEBUG_BELCH("ACQUIRE_LOCK", mutex); \
+  debugBelch("ACQUIRE_LOCK(0x%p) %s %d\n", mutex,__FILE__,__LINE__); \
+  pthread_mutex_lock(mutex)
+#define RELEASE_LOCK(mutex) \
+  debugBelch("RELEASE_LOCK(0x%p) %s %d\n", mutex,__FILE__,__LINE__); \
+  pthread_mutex_unlock(mutex)
+#define ASSERT_LOCK_HELD(mutex) /* nothing */
+
+#elif defined(DEBUG) && defined(linux_HOST_OS)
+#include <errno.h>
+/* 
+ * On Linux, we can use extensions to determine whether we already
+ * hold a lock or not, which is useful for debugging.
+ */
+#define ACQUIRE_LOCK(mutex) \
   if (pthread_mutex_lock(mutex) == EDEADLK) { \
     barf("multiple ACQUIRE_LOCK: %s %d", __FILE__,__LINE__); \
   }
-
 #define RELEASE_LOCK(mutex) \
-  LOCK_DEBUG_BELCH("RELEASE_LOCK", mutex); \
   if (pthread_mutex_unlock(mutex) != 0) { \
     barf("RELEASE_LOCK: I do not own this lock: %s %d", __FILE__,__LINE__); \
   }
 
 #define ASSERT_LOCK_HELD(mutex) ASSERT(pthread_mutex_lock(mutex) == EDEADLK)
 
+#define ASSERT_LOCK_NOTHELD(mutex)             \
+  if (pthread_mutex_lock(mutex) != EDEADLK) {  \
+     pthread_mutex_unlock(mutex);              \
+  } else {                                     \
+    ASSERT(0);                                 \
+  }
+
+
+#else
+
+#define ACQUIRE_LOCK(mutex) pthread_mutex_lock(mutex)
+#define RELEASE_LOCK(mutex) pthread_mutex_unlock(mutex)
+#define ASSERT_LOCK_HELD(mutex) /* nothing */
+
+#endif
+
 #endif // CMINUSMINUS
 
 # elif defined(HAVE_WINDOWS_H)