Sending SIGUSR1 to thread in nanosleep causes segfault

[James Cotton]

Hello, I've been trying to get the FreeRTOS Posix simulator to run on
Cygwin and have run into a few bugs in the signal handling/pthread
libraries and have isolated test cases

Essentially sending a SIGUSR1 to a pthread causes a segfault if that
thread is in sleep/nanosleep/select.  This behavior continues if you
comment out the printing behavior.

I believe at least nanosleep is meant to return when it receives a
signal so this seems like a bug.

Thanks,
James
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