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|
package main
import (
"fmt"
"runtime"
"syscall"
"time"
"unsafe"
"golang.org/x/sys/unix"
)
const sleepSyscallsEmitFor = 2 * time.Second
func sleepSyscalls() error {
deadline := time.Now().Add(sleepSyscallsEmitFor)
for time.Now().Before(deadline) {
if err := syscall.Nanosleep(&syscall.Timespec{Sec: 0, Nsec: 2_000_000}, nil); err != nil && err != syscall.EINTR {
return fmt.Errorf("nanosleep: %w", err)
}
if err := callClockNanosleep(3_000_000); err != nil {
return err
}
}
return nil
}
func callClockNanosleep(requestedNs int64) error {
req := unix.Timespec{Sec: requestedNs / 1_000_000_000, Nsec: requestedNs % 1_000_000_000}
_, _, errno := syscall.RawSyscall6(
unix.SYS_CLOCK_NANOSLEEP,
uintptr(unix.CLOCK_MONOTONIC),
0,
uintptr(unsafe.Pointer(&req)),
0,
0,
0,
)
runtime.KeepAlive(req)
if errno != 0 && errno != syscall.EINTR {
return fmt.Errorf("clock_nanosleep: %w", errno)
}
return nil
}
|
