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replay: use clock_nanosleep for precise waiting on the scale of nanoseconds (#32125)

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use clock_nanosleep
old-commit-hash: 354cbe5a26502bf08370d5386400c0efb72fc9e9
This commit is contained in:
Dean Lee
2024-04-09 02:59:17 +08:00
committed by GitHub
parent 8c580f8d50
commit 620f74d3b9
1 changed files with 5 additions and 14 deletions
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19
tools/replay/util.cc
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@@ -304,20 +304,11 @@ std::string decompressBZ2(const std::byte *in, size_t in_size, std::atomic<bool>
}
void precise_nano_sleep(long sleep_ns) {
const long estimate_ns = 1 * 1e6; // 1ms
struct timespec req = {.tv_nsec = estimate_ns};
uint64_t start_sleep = nanos_since_boot();
while (sleep_ns > estimate_ns) {
nanosleep(&req, nullptr);
uint64_t end_sleep = nanos_since_boot();
sleep_ns -= (end_sleep - start_sleep);
start_sleep = end_sleep;
}
// spin wait
if (sleep_ns > 0) {
while ((nanos_since_boot() - start_sleep) <= sleep_ns) {
std::this_thread::yield();
}
struct timespec req = {.tv_sec = 0, .tv_nsec = sleep_ns};
struct timespec rem = {};
while (clock_nanosleep(CLOCK_MONOTONIC, 0, &req, &rem) && errno == EINTR) {
// Retry sleep if interrupted by a signal
req = rem;
}
}