X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rts%2FCapability.c;h=95050baaa98af5e645869366540b768b705a2a99;hb=cf036e5bd578769729fbbcbf67cb2277da9ba0bc;hp=0e4d5a6a30594e6e8d8e52d8d3b1626bc7dcb226;hpb=a5288c551349a0adab0d931a429b10a096d9444d;p=ghc-hetmet.git

diff --git a/rts/Capability.c b/rts/Capability.c
index 0e4d5a6..95050ba 100644
--- a/rts/Capability.c
+++ b/rts/Capability.c
@@ -77,37 +77,40 @@ findSpark (Capability *cap)
   rtsBool retry;
   nat i = 0;
 
-  if (!emptyRunQueue(cap)) {
+  if (!emptyRunQueue(cap) || cap->returning_tasks_hd != NULL) {
       // If there are other threads, don't try to run any new
       // sparks: sparks might be speculative, we don't want to take
       // resources away from the main computation.
       return 0;
   }
 
-  // first try to get a spark from our own pool.
-  // We should be using reclaimSpark(), because it works without
-  // needing any atomic instructions:
-  //   spark = reclaimSpark(cap->sparks);
-  // However, measurements show that this makes at least one benchmark
-  // slower (prsa) and doesn't affect the others.
-  spark = tryStealSpark(cap);
-  if (spark != NULL) {
-      cap->sparks_converted++;
+  do {
+      retry = rtsFalse;
 
-      // Post event for running a spark from capability's own pool.
-      traceSchedEvent(cap, EVENT_RUN_SPARK, cap->r.rCurrentTSO, 0);
+      // first try to get a spark from our own pool.
+      // We should be using reclaimSpark(), because it works without
+      // needing any atomic instructions:
+      //   spark = reclaimSpark(cap->sparks);
+      // However, measurements show that this makes at least one benchmark
+      // slower (prsa) and doesn't affect the others.
+      spark = tryStealSpark(cap);
+      if (spark != NULL) {
+          cap->sparks_converted++;
 
-      return spark;
-  }
+          // Post event for running a spark from capability's own pool.
+          traceSchedEvent(cap, EVENT_RUN_SPARK, cap->r.rCurrentTSO, 0);
 
-  if (n_capabilities == 1) { return NULL; } // makes no sense...
+          return spark;
+      }
+      if (!emptySparkPoolCap(cap)) {
+          retry = rtsTrue;
+      }
 
-  debugTrace(DEBUG_sched,
-	     "cap %d: Trying to steal work from other capabilities", 
-	     cap->no);
+      if (n_capabilities == 1) { return NULL; } // makes no sense...
 
-  do {
-      retry = rtsFalse;
+      debugTrace(DEBUG_sched,
+                 "cap %d: Trying to steal work from other capabilities", 
+                 cap->no);
 
       /* visit cap.s 0..n-1 in sequence until a theft succeeds. We could
       start at a random place instead of 0 as well.  */
@@ -827,6 +830,7 @@ static void
 freeCapability (Capability *cap)
 {
     stgFree(cap->mut_lists);
+    stgFree(cap->saved_mut_lists);
 #if defined(THREADED_RTS)
     freeSparkPool(cap->sparks);
 #endif