[Chicken-janitors] #1255: Parallel signal dispatch may corrupt the stack limit

[Chicken Trac]

#1255: Parallel signal dispatch may corrupt the stack limit
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 Reporter:  evhan            |      Owner:
     Type:  defect           |     Status:  new
 Priority:  major            |  Milestone:  someday
Component:  core libraries   |    Version:  4.10.x
 Keywords:  signals threads  |
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 As reported by Jörg and discussed in
 [https://lists.nongnu.org/archive/html/chicken-
 hackers/2015-12/msg00006.html this chicken-hackers thread], when multiple
 signals are dispatched in parallel it's possible for {{{C_stack_limit}}}
 to be assigned an invalid value due to a race in {{{C_raise_interrupt}}}.

 {{{7216501}}} addressed the issue to a degree, but not entirely. A proper
 fix will likely require some synchronization around this section of code.

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Ticket URL: <http://bugs.call-cc.org/ticket/1255>
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