[issue40390] [subinterpreters] Implement _xxsubinterpreters.channel_send_wait()

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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components: +Subinterpreters -Library (Lib)
title: Implement _xxsubinterpreters.channel_send_wait(). -> [subinterpreters] Implement _xxsubinterpreters.channel_send_wait()

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40390>
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