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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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1
third_party/nsync/common.c vendored
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@ -182,7 +182,6 @@ static void free_waiters_populate (void) {
int n;
if (IsNetbsd ()) {
// netbsd needs a real file descriptor per semaphore
// tim cook wants us to use his lol central dispatch
n = 1;
} else {
n = __pagesize / sizeof(waiter);

2
third_party/nsync/futex.c vendored
View file

@ -185,7 +185,7 @@ static int nsync_futex_wait_win32_ (atomic_int *w, int expect, char pshare,
}
ok = WaitOnAddress (w, &expect, sizeof(int), nsync_time_64to32u (timespec_tomillis (wait)));
if (pt) {
/* __sig_cancel wakes our futex without changing `w` after enqueing signals */
/* __sig_wake wakes our futex without changing `w` after enqueing signals */
atomic_store_explicit (&pt->pt_blocker, 0, memory_order_release);
if (ok && atomic_load_explicit (w, memory_order_acquire) == expect && (sig = __sig_get (waitmask))) {
__sig_relay (sig, SI_KERNEL, waitmask);