[project @ 2003-08-19 16:32:23 by simonmar]

[ghc-hetmet.git] / ghc / rts / Capability.h

diff --git a/ghc/rts/Capability.h b/ghc/rts/Capability.h
index 71359b6..dd6a7be 100644 (file)
--- a/ghc/rts/Capability.h
+++ b/ghc/rts/Capability.h
@@ -32,15 +32,22 @@ extern void initCapabilities(void);
 extern void grabCapability(Capability** pCap);
 extern void releaseCapability(Capability* cap);
 
-#if defined(RTS_SUPPORTS_THREADS)
-/* total number of available capabilities */
 extern nat rts_n_free_capabilities;  
+#if defined(RTS_SUPPORTS_THREADS)
+/* number of worker threads waiting for a return capability
+ */
 extern nat rts_n_waiting_workers;
 
 extern void grabReturnCapability(Mutex* pMutex, Capability** pCap);
-extern void yieldToReturningWorker(Mutex* pMutex, Capability* cap);
+extern void yieldToReturningWorker(Mutex* pMutex, Capability** pCap);
 extern void waitForWorkCapability(Mutex* pMutex, Capability** pCap, rtsBool runnable);
 
+
+static inline rtsBool needToYieldToReturningWorker(void)
+{
+       return rts_n_waiting_workers > 0;
+}
+
 static inline nat getFreeCapabilities (void)
 {
   return rts_n_free_capabilities;