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Re: [3.3] Followup to C++ forced unwinding
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Mark Mitchell wrote:
> Maybe you could point me at the source code for one of these thread
> library implementations where (1) holds, but (2) does not?
Just look at the code.
Cancellation is idempotent. Therefore a flag is set so that
cancellation cannot happen in cancellation handlers. If the program
continues cancellation won't be possible anymore and the program can get
stuck. pthread_exit() doesn't work anymore is one other thing. In
other implementation (maybe even in LinuxThreads) you get endless loops
of calling cleanup handlers.
There are countless ways this can go wrong. The requirements POSIX sets
on cancellationare so that it has to be stateful.
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