[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 b878507..dd6a7be 100644 (file)
--- a/ghc/rts/Capability.h
+++ b/ghc/rts/Capability.h
@@ -28,14 +28,25 @@
 extern Capability MainCapability;
 #endif
 
-
 extern void initCapabilities(void);
-extern void grabCapability(Capability** cap);
+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** 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)
 {