Emilio Cobos Álvarez
a0c49d6f4f
Based on the Rust implementations: * https://github.com/rust-lang/rust/blob/2aabf3ce0569dd7c8c2d2a27944850056dcf2566/library/std/src/sys/sync/mutex/mod.rs#L3 * https://github.com/rust-lang/rust/blob/2aabf3ce0569dd7c8c2d2a27944850056dcf2566/library/std/src/sys/sync/mutex/futex.rs * https://github.com/rust-lang/rust/blob/2aabf3ce0569dd7c8c2d2a27944850056dcf2566/library/std/src/sys/sync/condvar/futex.rs This is a ~0.4% speedometer improvement on Windows (Linux and Android measurements in progress). This also adds a Linux implementation that will be enabled in a separate bug if worth it. Differential Revision: https://phabricator.services.mozilla.com/D300059
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/Futex.h"
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#include <windows.h>
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namespace mozilla {
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static DWORD ConvertTimeout(const TimeDuration* aTimeout) {
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if (!aTimeout || *aTimeout == TimeDuration::Forever()) {
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return INFINITE;
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}
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double msecd = aTimeout->ToMilliseconds();
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if (msecd < 0.0) {
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return 0;
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}
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if (msecd > UINT32_MAX) {
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return INFINITE;
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}
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DWORD msec = static_cast<DWORD>(msecd);
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// Round sub-millisecond waits up to 1ms (bug 1437167 comment 6).
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if (msec == 0 && !aTimeout->IsZero()) {
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msec = 1;
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}
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return msec;
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}
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template <typename T>
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bool FutexImpl<T>::wait(T aExpected, const TimeDuration* aTimeout) {
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return ::WaitOnAddress(reinterpret_cast<volatile void*>(&mValue), &aExpected,
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sizeof(aExpected), ConvertTimeout(aTimeout));
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}
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template <typename T>
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void FutexImpl<T>::wake() {
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::WakeByAddressSingle(reinterpret_cast<void*>(&mValue));
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}
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template <typename T>
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void FutexImpl<T>::wakeAll() {
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::WakeByAddressAll(reinterpret_cast<void*>(&mValue));
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}
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template struct FutexImpl<uint32_t>;
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template struct FutexImpl<uint8_t>;
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} // namespace mozilla
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