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cont.c (rb_fiber_atfork): th->root_fiber may not exist

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Otherwise, bootstraptest/test_fork.rb fails with -DVM_CHECK_MODE=2

[Bug #15041]

Fixes: r64589 "cont.c: set th->root_fiber to current fiber at fork"

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64593 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2018-08-30 19:14:37 +00:00
parent 3bcb4ff810
commit 13f4923551
1 changed files with 6 additions and 4 deletions
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10
cont.c
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@ -1981,11 +1981,13 @@ fiber_to_s(VALUE fibval)
void
rb_fiber_atfork(rb_thread_t *th)
{
if (&th->root_fiber->cont.saved_ec != th->ec) {
th->root_fiber = th->ec->fiber_ptr;
th->root_fiber->cont.type = ROOT_FIBER_CONTEXT;
if (th->root_fiber) {
if (&th->root_fiber->cont.saved_ec != th->ec) {
th->root_fiber = th->ec->fiber_ptr;
th->root_fiber->cont.type = ROOT_FIBER_CONTEXT;
}
th->root_fiber->prev = 0;
}
th->root_fiber->prev = 0;
}
#endif