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umwait is absolute

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lizzie 2026-05-24 04:12:21 +00:00
parent 2726e6a9d3
commit 78c572a294
1 changed files with 4 additions and 6 deletions
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10
src/common/thread.cpp
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@ -5,6 +5,7 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <chrono>
#include <limits>
#include <string>
#include <thread>
@ -182,7 +183,7 @@ bool Event::WaitFor(const std::chrono::nanoseconds time) {
_mm_monitorx(reinterpret_cast<u64*>(std::addressof(is_set)), 0, 0);
if (!is_set.load()) {
// RDTSC may be fenced here due to atomic load
s32 const cycles = s64(_rdtsc()) - s64(start);
s32 const cycles = std::min<s64>(std::numeric_limits<s32>::max(), s64(_rdtsc()) - s64(start));
if (cycles > 0) {
// See here: https://github.com/torvalds/linux/blob/948a64995aca6820abefd17f1a4258f5835c5ad9/arch/x86/lib/delay.c#L93
// MWAITX accepts a 32-bit input timer which determines the total number of cycles to wait for
@ -204,11 +205,8 @@ bool Event::WaitFor(const std::chrono::nanoseconds time) {
// #UD If CPUID.7.0:ECX.WAITPKG[bit 5]=0.
while (true) {
_umonitor(std::addressof(is_set));
if (!is_set.load()) {
s32 const cycles = s64(_rdtsc()) - s64(start);
if (!_umwait(1, cycles))
return false;
}
if (!is_set.load() && !_umwait(1, end)) //umwait is absolute time!!!
return false;
bool expected = true;
if (is_set.compare_exchange_weak(expected, false, std::memory_order_release))
return true;