[issue27483] Expose HEAD_LOCK/HEAD_UNLOCK in pystate.c

[STINNER Victor]

STINNER Victor added the comment:

Is the profiler running in the same process than the profiled application?

Vmprof uses a signal handler, right? HEAD_LOCK is a mutex, acquire a mutex
is not async-signal safe :-( Is it an issue?

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<http://bugs.python.org/issue27483>
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