Detect when a C finalizer calls back to Haskell

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

diff --git a/rts/Schedule.c b/rts/Schedule.c
index d22d48f..978adb8 100644 (file)
--- a/rts/Schedule.c
+++ b/rts/Schedule.c
@@ -32,6 +32,7 @@
 #include "Proftimer.h"
 #include "ProfHeap.h"
 #include "GC.h"
+#include "Weak.h"
 
 /* PARALLEL_HASKELL includes go here */
 
@@ -281,6 +282,12 @@ schedule (Capability *initialCapability, Task *task)
              "### NEW SCHEDULER LOOP (task: %p, cap: %p)",
              task, initialCapability);
 
+  if (running_finalizers) {
+      errorBelch("error: a C finalizer called back into Haskell.\n"
+                 "   use Foreign.Concurrent.newForeignPtr for Haskell finalizers.");
+      stg_exit(EXIT_FAILURE);
+  }
+
   schedulePreLoop();
 
   // -----------------------------------------------------------