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fix GC bug in futures when a blocking result is a tail call

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This commit is contained in:
Matthew Flatt 2011-11-25 07:04:00 -07:00
parent d9eb803e9c
commit 828848811d
1 changed files with 11 additions and 0 deletions
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11
src/racket/src/future.c
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@ -2787,6 +2787,17 @@ static void send_special_result(future_t *f, Scheme_Object *retval)
f->num_tail_rands = p->ku.apply.tail_num_rands;
p->ku.apply.tail_rator = NULL;
p->ku.apply.tail_rands = NULL;
if (p->ku.apply.tail_rands == p->tail_buffer) {
/* This only happens in the runtime thread; we need to
disconnect the tail buffer from `f->tail_rands' in
case of a GC. Beware that XFORM is disabled here. */
Scheme_Object **tb;
p->tail_buffer = NULL; /* so args aren't zeroed */
tb = MALLOC_N(Scheme_Object *, p->tail_buffer_size);
p = scheme_current_thread; /* in case GC moves the thread */
p->tail_buffer = tb;
}
}
}