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https://cygwin.com/pipermail/cygwin/2022-December/252737.html If the less is started from non-cygwin shell and window size is changed, it will hang-up when quitting. The cause of the proglem is that less uses longjump() in signal handler. If the signal handler is called while cygwin is acquiring the mutex, cygwin loses the chance to release mutex. With this patch, the mutex is released just before calling kill_pgrp() and re-acquired when kill_pgrp() returns. Reported-by: Gregory Mason <grmason@epic.com> Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>