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If the process() fails and the signal remains in the queue, the most possible reason is that the target thread is already armed by another signal and does not handle it yet. With this patch, to increase the chance of handling it in the other threads, call yield() before retrying process(). Addresses: https://cygwin.com/pipermail/cygwin/2024-November/256744.html Fixes: e10f822a2b39 ("Cygwin: signal: Handle queued signal without explicit __SIGFLUSH") Reported-by: Christian Franke <Christian.Franke@t-online.de> Reviewed-by: Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp> (cherry picked from commit c48d58d838d90df6247123c487686699742d75de)
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cygwin documentation is available on the net at https://cygwin.com You might especially be interested in https://cygwin.com/faq/faq.html#faq.programming.building-cygwin