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net: select with deadlines (#14369)
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@ -65,56 +65,51 @@ fn @select(handle int, test Select, timeout time.Duration) ?bool {
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return C.FD_ISSET(handle, &set)
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return C.FD_ISSET(handle, &set)
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}
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}
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// select_with_retry will retry the select if select is failing
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// due to interrupted system call. This can happen on signals
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// for example the GC Boehm uses signals internally on garbage
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// collection
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[inline]
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[inline]
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fn select_with_retry(handle int, test Select, timeout time.Duration) ?bool {
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fn select_deadline(handle int, test Select, deadline time.Time) ?bool {
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mut retries := 10
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// if we have a 0 deadline here then the timeout that was passed was infinite...
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for retries > 0 {
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infinite := deadline.unix_time() == 0
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for infinite || time.now() <= deadline {
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timeout := if infinite { net.infinite_timeout } else { deadline - time.now() }
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ready := @select(handle, test, timeout) or {
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ready := @select(handle, test, timeout) or {
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if err.code() == 4 {
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if err.code() == 4 {
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// signal! lets retry max 10 times
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// Spurious wakeup from signal, keep waiting
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// suspend thread with sleep to let the gc get
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// cycles in the case the Bohem gc is interupting
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time.sleep(1 * time.millisecond)
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retries -= 1
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continue
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continue
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}
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}
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// we got other error
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// NOT a spurious wakeup
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return err
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return err
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}
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}
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return ready
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return ready
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}
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}
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return error('failed to @select more that three times due to interrupted system call')
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// Deadline elapsed
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return false
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}
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}
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// wait_for_common wraps the common wait code
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// wait_for_common wraps the common wait code
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fn wait_for_common(handle int, deadline time.Time, timeout time.Duration, test Select) ? {
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fn wait_for_common(handle int, deadline time.Time, timeout time.Duration, test Select) ? {
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if deadline.unix == 0 {
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// Convert timeouts to deadlines
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// do not accept negative timeout
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real_deadline := if timeout == net.infinite_timeout {
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if timeout < 0 {
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time.unix(0)
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return err_timed_out
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} else if timeout == 0 {
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}
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// No timeout set, so assume deadline
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ready := select_with_retry(handle, test, timeout) ?
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deadline
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if ready {
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} else if timeout < 0 {
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return
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// TODO(emily): Do something nicer here :)
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}
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panic('invalid negative timeout')
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return err_timed_out
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} else {
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// timeout
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time.now().add(timeout)
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}
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}
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// Convert the deadline into a timeout
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// and use that
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ready := select_deadline(handle, test, real_deadline) ?
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d_timeout := deadline.unix - time.now().unix
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if d_timeout < 0 {
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// deadline is in the past so this has already
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// timed out
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return err_timed_out
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}
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ready := select_with_retry(handle, test, timeout) ?
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if ready {
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if ready {
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return
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return
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}
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}
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return err_timed_out
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return err_timed_out
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}
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}
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