Diff of /src/runtime/cheneygc.c [2da80a] .. [93108e] Maximize Restore

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--- a/src/runtime/cheneygc.c
+++ b/src/runtime/cheneygc.c
@@ -136,6 +136,8 @@
     gettimeofday(&start_tv, (struct timezone *) 0);
 #endif
 	
+    /* it's possible that signals are blocked already if this was called 
+     * from a signal handler (e.g. with the sigsegv gc_trigger stuff) */
     sigemptyset(&tmp);
     sigaddset_blockable(&tmp);
     sigprocmask(SIG_BLOCK, &tmp, &old);