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2016-02-26T10:03:21Z stassats: if fork is not signal safe, then just without-interrupts is not enough, it should set a signal mask
2016-02-26T10:04:08Z stassats: i see     /* unblock signals */ sigemptyset(&sset); sigprocmask(SIG_SETMASK, &sset, NULL);
2016-02-26T10:04:13Z stassats: but where is the block signals part?
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2016-02-26T10:23:36Z stassats: but just blocking sig_stop_for_gc wouldn't really work
2016-02-26T10:26:00Z stassats: maybe even without full safepoints we can have non-stopping foreign threads
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2016-02-26T14:24:18Z scymtym: stassats: already caught one :key #'string= http://report.quicklisp.org/2016-02-25/failure-report/js.html#cl-js
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2016-02-26T15:08:33Z stassats: nice
2016-02-26T15:10:28Z stassats: though, i expected a different warning wording
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2016-02-26T15:16:03Z stassats: ok, fixing it
2016-02-26T15:16:13Z stassats: should be warning: The function STRING= is called by SET-DIFFERENCE with one argument, but wants at least two.
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2016-02-26T16:02:50Z foom: fork is a funny function
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2016-02-26T18:16:25Z stassats: i think if i move out vop argument loading of the generator function and use something shared it can reduce core size, since there are a lot vops
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2016-02-26T19:03:02Z stassats: receive-pending-interrupt after each foreign call might be too much, but maybe there is a way to mark PA interrupted from a different thread
2016-02-26T19:07:38Z stassats: i guess masking and unmasking signal mask is expensive too
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2016-02-26T19:08:42Z stassats: so it needs to be similar to what safepoints do, but without safepoints
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2016-02-26T19:30:00Z pkhuong: stassats: if tracepoints still work, GC could insert a breakpoint after CALL instruction
2016-02-26T19:46:35Z stassats: i'm thinking what would happen if it returns from a foreign function in the middle of gc operation
2016-02-26T19:46:47Z stassats: can it just wait, can gc examine the stack correctly, etc.
2016-02-26T19:52:02Z pkhuong: stassats: right. so insert a breakpoint after the CALL instruction
2016-02-26T19:52:13Z pkhuong: so when it returns from a foreign function it'll immediately hit the breakpoint handler
2016-02-26T19:52:25Z pkhuong: replace int3/ud with the original byte when GC is done
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2016-02-26T20:30:51Z stassats: easier would be just to have a slot in the thread structure that is checked upon exit/callback entry
2016-02-26T20:35:18Z stassats: ok, i think stack scanning doesn't care if the thread is still running
2016-02-26T20:42:21Z stassats: now, how to atomically check for foreign-function-call-active and send a signal if it's not
2016-02-26T20:42:54Z stassats: x86oids do not even maintain foreign-function-call-active
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2016-02-26T20:53:28Z stassats: i guess something like thread-wants-to-stop = t; if (!foreign-function-call-active) { send-signal }
2016-02-26T20:53:40Z stassats: thread-wants-to-stop is checked before and after calling a foreign function
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2016-02-26T20:56:27Z stassats: ok, something to try in the next release cycle
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