[ruby-core:85155] Re: [Ruby trunk Misc#14222] Mutex.lock is not safe inside signal handler: what is?

[e-mail] wrote:
> I think that would be very helpful and help to discuss possible improvements.
> Also explaining why Mutex is problematic (the signal handler can be run between any 2 lines of code, and Mutex is not re-entrant).
> Can I assign this to you to create the document?

Sure; quite a bit of work and yes, I'm noticing some ickiness
along the way...


Ugh, I still hate how big rb_io_t is and the presence of write_lock +
rb_mutex_allow_trap does not make me comfortable(*) :<
(Fortunately pipes and sockets default to IO#sync=true)

I know some code uses Mutex#synchronize to cover a huge scope
nowadays, but maybe disabling Signal.trap blocks from firing
while any Mutex is locked gets rid of a huge chunk of problems
(at the expensive of new ones)

Or we could've had lock-free operations from the start and never
had a Mutex class in the first place :>

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