Re: igc, macOS avoiding signals

[Gerd Möllmann]

Helmut Eller <eller.helmut@gmail.com> writes:

>> Hm. Have you perhaps looked at a pthread implementation, what such a
>> mutex actually is on Linux?
>
> Judging from the source here
>
> https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=sysdeps/nptl/bits/struct_mutex.h;hb=HEAD
>
> and here
>
> https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=nptl/pthread_mutex_trylock.c;hb=HEAD
>
> I would say that the mutex is a struct with multiple fields and that
> pthread_mutex_trylock is neither a syscall nor an atomic instruction.
> The struct may simply be in an inconsistent state at the time t0, the
> beginning of the SIGPROF handler.
>
> Helmut

Thanks. It's similar on macOS. Too bad, I had hoped for some OS call or
something.