--- Log opened Sat Apr 23 00:00:03 2022
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06:21 < roconnor> https://github.com/ElementsProject/simplicity/blob/master/C/callonce.h
06:21 < roconnor> This is for C rather than CPP, but the general idea should hold.
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07:03 < roconnor> s/CPP/C++/
07:17 < roconnor> after reading your code, I kinda want to swap lines 11 and 12 now.
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15:08 < jeremyrubin> Yes that's incorrect unless initialize is nothrow
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15:43 < roconnor> in my defence, C has no exceptions.
15:46 < roconnor> I'm not sure I even want to know the semanics of call_once are supposed to be w.r.t. longjmp.
15:47 < roconnor> I suppose there is a question about recursion...
15:47 < roconnor> ugh.
16:06 < roconnor> https://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_once.html
16:07 < roconnor> The pthread_once() function is not a cancellation point. However, if init_routine is a cancellation point and is canceled, the effect on once_control shall be as if pthread_once() was never called.
16:07 < roconnor> If the call to init_routine is terminated by a call to longjmp(), _longjmp(), or siglongjmp(), the behavior is undefined.
16:08 < roconnor> I'm not sure what a cancellation point is...
16:10 < roconnor> If init_routine recursively calls pthread_once() with the same once_control, the recursive call will not call the specified init_routine, and thus the specified init_routine will not complete, and thus the recursive call to pthread_once() will not return.
16:12 < roconnor> anyhow ... we aren't required to match the exact semantics for our local use of call_once.
16:19 < roconnor> I'm not even sure it is legal for non-multithreaded C to deadlock.  I vaguely recall that failure to progress through sequence points is undefined behaviour.  I might be wrong.
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--- Log closed Sun Apr 24 00:00:03 2022