[issue4293] Thread Safe Py_AddPendingCall

[Kristján Valur Jónsson]

Kristján Valur Jónsson <kristjan at ccpgames.com> added the comment:

Small refinement:  Deadlock avoidance is only needed on the main thread 
since we only install signal handlers for the main thread.

Added file: http://bugs.python.org/file12031/pendingalls.patch

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