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kernel: support timed umtx waits through shared address deadlines

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Co-authored-by: BlackCAT <52720489+psnwd@users.noreply.github.com>
This commit is contained in:
nmzik
2026-09-13 15:25:52 +04:00
parent f426d60ff1
commit f3c82a317a
4 changed files with 64 additions and 12 deletions
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tests/SyncOnAddressTests.cpp
+33
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@@ -110,6 +110,38 @@ void TestValueChangeAndWake() {
Check(result == OK, "a value change plus wake releases the waiter");
}
void TestNanosecondTimeout() {
uint64_t word = 0;
const auto start = std::chrono::steady_clock::now();
Check(Wait64(&word, 0, std::chrono::milliseconds(1)) ==
Libs::LibKernel::KERNEL_ERROR_ETIMEDOUT,
"64-bit timespec wait expires");
Check(std::chrono::steady_clock::now() - start >= std::chrono::milliseconds(1),
"timespec wait preserves its deadline");
Check(Wait64(&word, 0, std::chrono::nanoseconds(0)) ==
Libs::LibKernel::KERNEL_ERROR_ETIMEDOUT,
"zero timespec polls a matching value");
Check(Wait64(&word, 1, std::chrono::nanoseconds(0)) == OK,
"zero timespec succeeds on mismatch");
g_signal_poll_count.store(0, std::memory_order_relaxed);
std::atomic<bool> returned{false};
std::thread waker([&] {
while (g_signal_poll_count.load(std::memory_order_relaxed) < 2 &&
!returned.load(std::memory_order_acquire)) {
std::this_thread::yield();
}
Store(&word, UINT64_C(0x100000000));
Check(Wake(&word, 1) == OK, "wake releases a long timespec wait");
});
const int result = Wait64(&word, 0, std::chrono::nanoseconds::max(), CountSignalPoll);
returned.store(true, std::memory_order_release);
waker.join();
Check(result == OK, "long timespec wait does not overflow its deadline");
Check(g_signal_poll_count.load(std::memory_order_relaxed) > 1,
"timespec wait continues polling guest signals");
}
void TestWakeOneThenAll() {
constexpr int WAITER_COUNT = 4;
uint32_t word = 0;
@@ -260,6 +292,7 @@ int main() {
TestMismatchReturnsImmediately();
TestTimeout();
TestValueChangeAndWake();
TestNanosecondTimeout();
TestWakeOneThenAll();
TestAddressesAreIsolated();
TestCompareRegisterWakeRace();