#endif
extern void initCapabilities(void);
-extern void grabCapability(Capability** cap);
+extern void grabCapability(Capability** pCap);
extern void releaseCapability(Capability* cap);
-#if defined(SMP)
-extern nat rts_n_free_capabilities; /* 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;
-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 noFreeCapabilities()
+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);
+# else
+ return (rts_n_free_capabilities == 1);
+# endif
}
-#endif /* SMP */
+#endif /* RTS_SUPPORTS_THREADS */
#endif /* __CAPABILITY_H__ */