[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 e59f495..dd6a7be 100644 (file)
--- a/ghc/rts/Capability.h
+++ b/ghc/rts/Capability.h
@@ -29,23 +29,36 @@ extern Capability MainCapability;
 #endif
 
 extern void initCapabilities(void);
-extern void grabCapability(Capability** cap);
+extern void grabCapability(Capability** pCap);
 extern void releaseCapability(Capability* cap);
 
+extern nat rts_n_free_capabilities;  
 #if defined(RTS_SUPPORTS_THREADS)
-extern nat rts_n_free_capabilities;  /* total number of available capabilities */
+/* number of worker threads waiting for a return capability
+ */
+extern nat rts_n_waiting_workers;
 
-static inline nat getFreeCapabilities()
+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)
 {
   return rts_n_free_capabilities;
 }
 
-static inline rtsBool noCapabilities()
+static inline rtsBool noCapabilities (void)
 {
   return (rts_n_free_capabilities == 0);
 }
 
-static inline rtsBool allFreeCapabilities()
+static inline rtsBool allFreeCapabilities (void)
 {
 # if defined(SMP)
   return (rts_n_free_capabilities == RtsFlags.ParFlags.nNodes);