1 files changed, 156 insertions, 0 deletions
diff --git a/src/internal/poll/fd_poll_runtime.go b/src/internal/poll/fd_poll_runtime.go
new file mode 100644
index 0000000000..f0d7a22729
--- /dev/null
+++ b/src/internal/poll/fd_poll_runtime.go
@@ -0,0 +1,156 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin dragonfly freebsd linux netbsd openbsd windows solaris
+
+package poll
+
+import (
+	"errors"
+	"sync"
+	"syscall"
+	"time"
+)
+
+// runtimeNano returns the current value of the runtime clock in nanoseconds.
+func runtimeNano() int64
+
+func runtime_pollServerInit()
+func runtime_pollOpen(fd uintptr) (uintptr, int)
+func runtime_pollClose(ctx uintptr)
+func runtime_pollWait(ctx uintptr, mode int) int
+func runtime_pollWaitCanceled(ctx uintptr, mode int) int
+func runtime_pollReset(ctx uintptr, mode int) int
+func runtime_pollSetDeadline(ctx uintptr, d int64, mode int)
+func runtime_pollUnblock(ctx uintptr)
+
+type pollDesc struct {
+	runtimeCtx uintptr
+}
+
+var serverInit sync.Once
+
+func (pd *pollDesc) init(fd *FD) error {
+	serverInit.Do(runtime_pollServerInit)
+	ctx, errno := runtime_pollOpen(uintptr(fd.Sysfd))
+	if errno != 0 {
+		if ctx != 0 {
+			runtime_pollUnblock(ctx)
+			runtime_pollClose(ctx)
+		}
+		return syscall.Errno(errno)
+	}
+	pd.runtimeCtx = ctx
+	return nil
+}
+
+func (pd *pollDesc) close() {
+	if pd.runtimeCtx == 0 {
+		return
+	}
+	runtime_pollClose(pd.runtimeCtx)
+	pd.runtimeCtx = 0
+}
+
+// Evict evicts fd from the pending list, unblocking any I/O running on fd.
+func (pd *pollDesc) evict() {
+	if pd.runtimeCtx == 0 {
+		return
+	}
+	runtime_pollUnblock(pd.runtimeCtx)
+}
+
+func (pd *pollDesc) prepare(mode int) error {
+	if pd.runtimeCtx == 0 {
+		return nil
+	}
+	res := runtime_pollReset(pd.runtimeCtx, mode)
+	return convertErr(res)
+}
+
+func (pd *pollDesc) prepareRead() error {
+	return pd.prepare('r')
+}
+
+func (pd *pollDesc) prepareWrite() error {
+	return pd.prepare('w')
+}
+
+func (pd *pollDesc) wait(mode int) error {
+	if pd.runtimeCtx == 0 {
+		return errors.New("waiting for unsupported file type")
+	}
+	res := runtime_pollWait(pd.runtimeCtx, mode)
+	return convertErr(res)
+}
+
+func (pd *pollDesc) waitRead() error {
+	return pd.wait('r')
+}
+
+func (pd *pollDesc) waitWrite() error {
+	return pd.wait('w')
+}
+
+func (pd *pollDesc) waitCanceled(mode int) {
+	if pd.runtimeCtx == 0 {
+		return
+	}
+	runtime_pollWaitCanceled(pd.runtimeCtx, mode)
+}
+
+func (pd *pollDesc) waitCanceledRead() {
+	pd.waitCanceled('r')
+}
+
+func (pd *pollDesc) waitCanceledWrite() {
+	pd.waitCanceled('w')
+}
+
+func convertErr(res int) error {
+	switch res {
+	case 0:
+		return nil
+	case 1:
+		return ErrClosing
+	case 2:
+		return ErrTimeout
+	}
+	println("unreachable: ", res)
+	panic("unreachable")
+}
+
+func (fd *FD) SetDeadline(t time.Time) error {
+	return setDeadlineImpl(fd, t, 'r'+'w')
+}
+
+func (fd *FD) SetReadDeadline(t time.Time) error {
+	return setDeadlineImpl(fd, t, 'r')
+}
+
+func (fd *FD) SetWriteDeadline(t time.Time) error {
+	return setDeadlineImpl(fd, t, 'w')
+}
+
+func setDeadlineImpl(fd *FD, t time.Time, mode int) error {
+	diff := int64(time.Until(t))
+	d := runtimeNano() + diff
+	if d <= 0 && diff > 0 {
+		// If the user has a deadline in the future, but the delay calculation
+		// overflows, then set the deadline to the maximum possible value.
+		d = 1<<63 - 1
+	}
+	if t.IsZero() {
+		d = 0
+	}
+	if err := fd.incref(); err != nil {
+		return err
+	}
+	if fd.pd.runtimeCtx == 0 {
+		return errors.New("file type does not support deadlines")
+	}
+	runtime_pollSetDeadline(fd.pd.runtimeCtx, d, mode)
+	fd.decref()
+	return nil
+}