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Write more tests for signal handling

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There's now a much stronger level of assurance that signaling on Windows
will be atomic, low-latency, low tail latency, and shall never deadlock.
This commit is contained in:
Justine Tunney 2024-09-21 05:24:56 -07:00
parent 0e59afb403
commit dd8c4dbd7d
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GPG key ID: BE714B4575D6E328
19 changed files with 407 additions and 75 deletions
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7
libc/calls/sigsuspend.c
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@ -53,8 +53,15 @@ int sigsuspend(const sigset_t *ignore) {
} else {
sigset_t waitmask = ignore ? *ignore : 0;
if (IsWindows() || IsMetal()) {
// we don't strictly need to block signals, but it reduces signal
// delivery latency, by preventing other threads from delivering a
// signal asynchronously. it takes about ~5us to deliver a signal
// using SetEvent() whereas it takes ~30us to use SuspendThread(),
// GetThreadContext(), SetThreadContext(), and ResumeThread().
BLOCK_SIGNALS;
while (!(rc = _park_norestart(-1u, waitmask)))
donothing;
ALLOW_SIGNALS;
} else {
rc = sys_sigsuspend((uint64_t[2]){waitmask}, 8);
}