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A Scheme program can set a signal mask, which is a set of signals to be blocked from delivery. If a signal is delivered which is completely blocked in the process, the signal becomes "pending". The pending signal may be delivered once the signal mask is changed not to block the specified signal. (However, it depends on the operating system whether the pending signals are queued or not.)
In multithread environment, each thread has its own signal mask.
<sys-sigset>object. How argument should be one of the following integer constants: