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kernel: block short sleep requests instead of busy waiting

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This commit is contained in:
nmzik
2026-09-29 16:38:07 +04:00
parent 0c844e4bc2
commit 6f24b031f5
2 changed files with 3 additions and 70 deletions
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src/kernel/pthread.cpp
+1 -30
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@@ -512,15 +512,6 @@ static void SchedulerBackoffOnce() {
#endif
}
static bool SleepMicroSchedulerBackoff(uint64_t microseconds) {
if (microseconds > 1) {
return false;
}
SchedulerBackoffOnce();
return true;
}
static void SleepMicroWithSignalPoll(uint64_t microseconds) {
if (microseconds == 0) {
KernelDispatchPendingSignalForCurrentThread();
@@ -529,9 +520,7 @@ static void SleepMicroWithSignalPoll(uint64_t microseconds) {
while (microseconds > 0) {
const auto step = std::min<uint64_t>(microseconds, SIGNAL_APC_POLL_MICROS);
if (!SleepMicroSchedulerBackoff(step)) {
Common::Thread::SleepMicro(step);
}
Common::Thread::SleepMicro(step);
microseconds -= step;
KernelDispatchPendingSignalForCurrentThread();
}
@@ -3842,28 +3831,16 @@ void KYTY_SYSV_ABI KernelSetThreadDtors(thread_dtors_func_t dtors) {
}
int KYTY_SYSV_ABI KernelUsleep(KernelUseconds microseconds) {
Common::Timer t;
t.Start();
SleepMicroWithSignalPoll(microseconds);
// double ts = t.GetTimeS();
// LOGF("\tactual: %g microseconds\n", ts * 1000000.0);
return OK;
}
unsigned int KYTY_SYSV_ABI KernelSleep(unsigned int seconds) {
PRINT_NAME();
LOGF("\tsleep: %u\n", seconds);
Common::Timer t;
t.Start();
SleepMicroWithSignalPoll(static_cast<uint64_t>(seconds) * 1000000ull);
double ts = t.GetTimeS();
LOGF("\tactual: %g seconds\n", ts);
return OK;
}
int KYTY_SYSV_ABI KernelNanosleep(const KernelTimespec* rqtp, KernelTimespec* rmtp) {
PRINT_NAME();
if (rqtp == nullptr) {
return KERNEL_ERROR_EFAULT;
}
@@ -3880,13 +3857,7 @@ int KYTY_SYSV_ABI KernelNanosleep(const KernelTimespec* rqtp, KernelTimespec* rm
uint64_t nanos =
static_cast<uint64_t>(rqtp->tv_sec) * 1000000000ull + static_cast<uint64_t>(rqtp->tv_nsec);
LOGF("\tnanosleep: %" PRIu64 "\n", nanos);
Common::Timer t;
t.Start();
SleepNanoWithSignalPoll(nanos);
double ts = t.GetTimeS();
LOGF("\tactual: %g nanoseconds\n", ts * 1000000000.0);
if (rmtp != nullptr) {
rmtp->tv_sec = 0;