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authorTimothy E Baldwin <T.E.Baldwin99@members.leeds.ac.uk>2016-05-27 15:51:53 +0100
committerRiku Voipio <riku.voipio@linaro.org>2016-06-07 16:39:07 +0300
commit655ed67c2a248cf0a887229d8492d6ddc0518545 (patch)
tree542aa631caa63e220ac88e259d03942eb694b590 /spice-qemu-char.c
parent907f5fddaa673ac3f6dc955df6eac2870e3603f4 (diff)
linux-user: Queue synchronous signals separately
If a synchronous signal and an asynchronous signal arrive near simultaneously, and the signal number of the asynchronous signal is lower than that of the synchronous signal the the handler for the asynchronous would be called first, and then the handler for the synchronous signal would be called within or after the first handler with an incorrect context. This is fixed by queuing synchronous signals separately. Note that this does risk delaying a asynchronous signal until the synchronous signal handler returns rather than handling the signal on another thread, but this seems unlikely to cause problems for real guest programs and is unavoidable unless we could guarantee to roll back and reexecute whatever guest instruction caused the synchronous signal (which would be a bit odd if we've already logged its execution, for instance, and would require careful analysis of all guest CPUs to check it was possible in all cases). Signed-off-by: Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk> Message-id: 1441497448-32489-24-git-send-email-T.E.Baldwin99@members.leeds.ac.uk [PMM: added a comment] Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
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