0.7.4.17: Mostly Alpha fixes

[sbcl.git] / src / runtime / interrupt.c

diff --git a/src/runtime/interrupt.c b/src/runtime/interrupt.c
index 467a2e4..3e308b1 100644 (file)
--- a/src/runtime/interrupt.c
+++ b/src/runtime/interrupt.c
@@ -32,6 +32,7 @@
 #include "dynbind.h"
 #include "interr.h"
 
+
 void sigaddset_blockable(sigset_t *s)
 {
     sigaddset(s, SIGHUP);
@@ -550,11 +551,20 @@ interrupt_maybe_gc(int signal, siginfo_t *info, void *void_context)
            arch_set_pseudo_atomic_interrupted(context);
        }
        else {
+           lispobj *old_free_space=current_dynamic_space;
            fake_foreign_function_call(context);
            funcall0(SymbolFunction(MAYBE_GC));
            undo_fake_foreign_function_call(context);
-       }
-
+           if(current_dynamic_space==old_free_space) 
+               /* MAYBE-GC (as the name suggest) might not.  If it
+                * doesn't, it won't reset the GC trigger either, so we
+                * have to do it ourselves.  Add small amount of space
+                * to tide us over while GC is inhibited 
+                */
+               set_auto_gc_trigger((u32)dynamic_space_free_pointer
+                                   -(u32)current_dynamic_space
+                                   +(u32)os_vm_page_size);
+       }       
        return 1;
     } else {
        return 0;