runtime: update netpoll_hurd.go for go1.14beta1 changes
Patch from Svante Signell. Updates PR go/93468 Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/216958
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@ -1,4 +1,4 @@
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132e0e61d59aaa52f8fdb03a925300c1ced2a0f2
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5b438257e6fe5f344ae2f973313f394cda85bf62
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The first line of this file holds the git revision number of the last
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merge done from the gofrontend repository.
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@ -85,6 +85,10 @@ func netpolldescriptor() uintptr {
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return uintptr(rdwake<<16 | wrwake)
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}
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func netpollIsPollDescriptor(fd uintptr) bool {
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return fd == uintptr(rdwake) || fd == uintptr(wrwake)
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}
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// netpollwakeup writes on wrwake to wakeup poll before any changes.
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func netpollwakeup() {
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if pendingUpdates == 0 {
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@ -158,17 +162,32 @@ func netpollarm(pd *pollDesc, mode int) {
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unlock(&mtxset)
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}
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// polls for ready network connections
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// returns list of goroutines that become runnable
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// netpollBreak interrupts an epollwait.
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func netpollBreak() {
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netpollwakeup()
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}
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// netpoll checks for ready network connections.
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// Returns list of goroutines that become runnable.
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// delay < 0: blocks indefinitely
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// delay == 0: does not block, just polls
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// delay > 0: block for up to that many nanoseconds
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//go:nowritebarrierrec
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func netpoll(block bool) gList {
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func netpoll(delay int64) gList {
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timeout := int32(0)
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if !block {
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if delay < 0 {
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timeout = 0
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} else if delay == 0 {
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// TODO: call poll with timeout == 0
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return gList{}
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}
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if pollVerbose {
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println("*** netpoll", block)
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} else if delay < 1e6 {
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timeout = 1
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} else if delay < 1e15 {
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timeout = int32(delay / 1e6)
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} else {
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// An arbitrary cap on how long to wait for a timer.
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// 1e9 ms == ~11.5 days.
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timeout = 1e9
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}
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retry:
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lock(&mtxpoll)
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@ -176,40 +195,37 @@ retry:
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pendingUpdates = 0
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unlock(&mtxpoll)
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if pollVerbose {
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println("*** netpoll before poll")
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}
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n := libc_poll(&pfds[0], int32(len(pfds)), timeout)
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if pollVerbose {
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println("*** netpoll after poll", n)
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}
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if n < 0 {
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e := errno()
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if e != _EINTR {
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println("errno=", e, " len(pfds)=", len(pfds))
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throw("poll failed")
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}
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if pollVerbose {
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println("*** poll failed")
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}
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unlock(&mtxset)
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// If a timed sleep was interrupted, just return to
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// recalculate how long we should sleep now.
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if timeout > 0 {
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return gList{}
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}
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goto retry
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}
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// Check if some descriptors need to be changed
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if n != 0 && pfds[0].revents&(_POLLIN|_POLLHUP|_POLLERR) != 0 {
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if delay != 0 {
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// A netpollwakeup could be picked up by a
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// non-blocking poll. Only clear the wakeup
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// if blocking.
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var b [1]byte
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for read(rdwake, unsafe.Pointer(&b[0]), 1) == 1 {
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if pollVerbose {
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println("*** read 1 byte from pipe")
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}
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}
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// Do not look at the other fds in this case as the mode may have changed
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// XXX only additions of flags are made, so maybe it is ok
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unlock(&mtxset)
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goto retry
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// Still look at the other fds even if the mode may have
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// changed, as netpollBreak might have been called.
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n--
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}
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var toRun gList
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for i := 0; i < len(pfds) && n > 0; i++ {
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for i := 1; i < len(pfds) && n > 0; i++ {
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pfd := &pfds[i]
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var mode int32
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@ -222,19 +238,14 @@ retry:
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pfd.events &= ^_POLLOUT
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}
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if mode != 0 {
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if pollVerbose {
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println("*** netpollready i=", i, "revents=", pfd.revents, "events=", pfd.events, "pd=", pds[i])
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pds[i].everr = false
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if pfd.revents == _POLLERR {
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pds[i].everr = true
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}
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netpollready(&toRun, pds[i], mode)
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n--
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}
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}
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unlock(&mtxset)
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if block && toRun.empty() {
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goto retry
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}
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if pollVerbose {
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println("*** netpoll returning end")
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}
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return toRun
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}
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