Use message-passing to implement throwTo in the RTS

[ghc-hetmet.git] / rts / Threads.c

diff --git a/rts/Threads.c b/rts/Threads.c
index 3b209ea..f824d02 100644 (file)
--- a/rts/Threads.c
+++ b/rts/Threads.c
@@ -63,7 +63,7 @@ createThread(Capability *cap, nat size)
     }
 
     size = round_to_mblocks(size);
-    tso = (StgTSO *)allocateLocal(cap, size);
+    tso = (StgTSO *)allocate(cap, size);
 
     stack_size = size - TSO_STRUCT_SIZEW;
     TICK_ALLOC_TSO(stack_size, 0);
@@ -74,7 +74,7 @@ createThread(Capability *cap, nat size)
     tso->what_next = ThreadRunGHC;
 
     tso->why_blocked  = NotBlocked;
-    tso->blocked_exceptions = END_TSO_QUEUE;
+    tso->blocked_exceptions = END_BLOCKED_EXCEPTIONS_QUEUE;
     tso->flags = 0;
     tso->dirty = 1;
     
@@ -102,12 +102,12 @@ createThread(Capability *cap, nat size)
      */
     ACQUIRE_LOCK(&sched_mutex);
     tso->id = next_thread_id++;  // while we have the mutex
-    tso->global_link = g0s0->threads;
-    g0s0->threads = tso;
+    tso->global_link = g0->threads;
+    g0->threads = tso;
     RELEASE_LOCK(&sched_mutex);
     
     // ToDo: report the stack size in the event?
-    traceSchedEvent (cap, EVENT_CREATE_THREAD, tso, tso->stack_size);
+    traceEventCreateThread(cap, tso);
 
     return tso;
 }
@@ -218,8 +218,9 @@ unblockOne_ (Capability *cap, StgTSO *tso,
 
   // NO, might be a WHITEHOLE: ASSERT(get_itbl(tso)->type == TSO);
   ASSERT(tso->why_blocked != NotBlocked);
+  ASSERT(tso->why_blocked != BlockedOnMsgWakeup || 
+         tso->block_info.closure->header.info == &stg_IND_info);
 
-  tso->why_blocked = NotBlocked;
   next = tso->_link;
   tso->_link = END_TSO_QUEUE;
 
@@ -230,11 +231,13 @@ unblockOne_ (Capability *cap, StgTSO *tso,
       // We are waking up this thread on the current Capability, which
       // might involve migrating it from the Capability it was last on.
       if (tso->bound) {
-         ASSERT(tso->bound->cap == tso->cap);
-         tso->bound->cap = cap;
+         ASSERT(tso->bound->task->cap == tso->cap);
+         tso->bound->task->cap = cap;
       }
 
       tso->cap = cap;
+      write_barrier();
+      tso->why_blocked = NotBlocked;
       appendToRunQueue(cap,tso);
 
       // context-switch soonish so we can migrate the new thread if
@@ -246,6 +249,7 @@ unblockOne_ (Capability *cap, StgTSO *tso,
       wakeupThreadOnCapability(cap, tso->cap, tso);
   }
 #else
+  tso->why_blocked = NotBlocked;
   appendToRunQueue(cap,tso);
 
   // context-switch soonish so we can migrate the new thread if
@@ -254,7 +258,7 @@ unblockOne_ (Capability *cap, StgTSO *tso,
   cap->context_switch = 1;
 #endif
 
-  traceSchedEvent (cap, EVENT_THREAD_WAKEUP, tso, tso->cap->no);
+  traceEventThreadWakeup (cap, tso, tso->cap->no);
 
   return next;
 }
@@ -327,13 +331,15 @@ printThreadBlockage(StgTSO *tso)
   case BlockedOnMVar:
     debugBelch("is blocked on an MVar @ %p", tso->block_info.closure);
     break;
-  case BlockedOnException:
-    debugBelch("is blocked on delivering an exception to thread %lu",
-              (unsigned long)tso->block_info.tso->id);
-    break;
   case BlockedOnBlackHole:
     debugBelch("is blocked on a black hole");
     break;
+  case BlockedOnMsgWakeup:
+    debugBelch("is blocked on a wakeup message");
+    break;
+  case BlockedOnMsgThrowTo:
+    debugBelch("is blocked on a throwto message");
+    break;
   case NotBlocked:
     debugBelch("is not blocked");
     break;
@@ -387,24 +393,10 @@ void
 printAllThreads(void)
 {
   StgTSO *t, *next;
-  nat i, s;
+  nat i, g;
   Capability *cap;
 
-# if defined(GRAN)
-  char time_string[TIME_STR_LEN], node_str[NODE_STR_LEN];
-  ullong_format_string(TIME_ON_PROC(CurrentProc), 
-                      time_string, rtsFalse/*no commas!*/);
-
-  debugBelch("all threads at [%s]:\n", time_string);
-# elif defined(PARALLEL_HASKELL)
-  char time_string[TIME_STR_LEN], node_str[NODE_STR_LEN];
-  ullong_format_string(CURRENT_TIME,
-                      time_string, rtsFalse/*no commas!*/);
-
-  debugBelch("all threads at [%s]:\n", time_string);
-# else
   debugBelch("all threads:\n");
-# endif
 
   for (i = 0; i < n_capabilities; i++) {
       cap = &capabilities[i];
@@ -415,8 +407,8 @@ printAllThreads(void)
   }
 
   debugBelch("other threads:\n");
-  for (s = 0; s < total_steps; s++) {
-    for (t = all_steps[s].threads; t != END_TSO_QUEUE; t = next) {
+  for (g = 0; g < RtsFlags.GcFlags.generations; g++) {
+    for (t = generations[g].threads; t != END_TSO_QUEUE; t = next) {
       if (t->why_blocked != NotBlocked) {
          printThreadStatus(t);
       }