once: replace all uses of package once with sync.Once.

package once remains for now; will be deleted after next release.

R=golang-dev, brainman
CC=golang-dev
https://golang.org/cl/1914046

src/pkg/crypto/tls/common.go

@@ -9,7 +9,7 @@ import (
 	"crypto/rsa"
 	"io"
 	"io/ioutil"
-	"once"
+	"sync"
 	"time"
 )
 
@@ -127,6 +127,8 @@ func mutualVersion(vers uint16) (uint16, bool) {
 // The defaultConfig is used in place of a nil *Config in the TLS server and client.
 var varDefaultConfig *Config
 
+var once sync.Once
+
 func defaultConfig() *Config {
 	once.Do(initDefaultConfig)
 	return varDefaultConfig

src/pkg/mime/type.go

@@ -7,7 +7,6 @@ package mime
 
 import (
 	"bufio"
-	"once"
 	"os"
 	"strings"
 	"sync"
@@ -69,6 +68,8 @@ func initMime() {
 	}
 }
 
+var once sync.Once
+
 // TypeByExtension returns the MIME type associated with the file extension ext.
 // The extension ext should begin with a leading dot, as in ".html".
 // When ext has no associated type, TypeByExtension returns "".

src/pkg/net/dnsclient.go

@@ -15,9 +15,9 @@
 package net
 
 import (
-	"once"
 	"os"
 	"rand"
+	"sync"
 	"time"
 )
 
@@ -235,11 +235,13 @@ func isDomainName(s string) bool {
 	return ok
 }
 
+var onceLoadConfig sync.Once
+
 func lookup(name string, qtype uint16) (cname string, addrs []dnsRR, err os.Error) {
 	if !isDomainName(name) {
 		return name, nil, &DNSError{Error: "invalid domain name", Name: name}
 	}
-	once.Do(loadConfig)
+	onceLoadConfig.Do(loadConfig)
 	if dnserr != nil || cfg == nil {
 		err = dnserr
 		return
@@ -293,7 +295,7 @@ func lookup(name string, qtype uint16) (cname string, addrs []dnsRR, err os.Erro
 // It returns the canonical name for the host and an array of that
 // host's addresses.
 func LookupHost(name string) (cname string, addrs []string, err os.Error) {
-	once.Do(loadConfig)
+	onceLoadConfig.Do(loadConfig)
 	if dnserr != nil || cfg == nil {
 		err = dnserr
 		return

src/pkg/net/fd.go

@@ -8,7 +8,6 @@ package net
 
 import (
 	"io"
-	"once"
 	"os"
 	"sync"
 	"syscall"
@@ -258,6 +257,7 @@ func (s *pollServer) WaitWrite(fd *netFD) {
 // All the network FDs use a single pollServer.
 
 var pollserver *pollServer
+var onceStartServer sync.Once
 
 func startServer() {
 	p, err := newPollServer()
@@ -268,7 +268,7 @@ func startServer() {
 }
 
 func newFD(fd, family, proto int, net string, laddr, raddr Addr) (f *netFD, err os.Error) {
-	once.Do(startServer)
+	onceStartServer.Do(startServer)
 	if e := syscall.SetNonblock(fd, true); e != 0 {
 		return nil, &OpError{"setnonblock", net, laddr, os.Errno(e)}
 	}

src/pkg/net/fd_windows.go

@@ -5,13 +5,14 @@
 package net
 
 import (
-	"once"
 	"os"
 	"sync"
 	"syscall"
 	"unsafe"
 )
 
+var onceStartServer sync.Once
+
 // BUG(brainman): The Windows implementation does not implement SetTimeout.
 
 // IO completion result parameters.
@@ -119,6 +120,7 @@ func (s *pollServer) Run() {
 // All the network FDs use a single pollServer.
 
 var pollserver *pollServer
+var onceStartServer sync.Once
 
 func startServer() {
 	p, err := newPollServer()
@@ -134,7 +136,7 @@ func newFD(fd, family, proto int, net string, laddr, raddr Addr) (f *netFD, err
 	if initErr != nil {
 		return nil, initErr
 	}
-	once.Do(startServer)
+	onceStartServer.Do(startServer)
 	// Associate our socket with pollserver.iocp.
 	if _, e := syscall.CreateIoCompletionPort(int32(fd), pollserver.iocp, 0, 0); e != 0 {
 		return nil, &OpError{"CreateIoCompletionPort", net, laddr, os.Errno(e)}
@@ -303,7 +305,7 @@ func (fd *netFD) accept(toAddr func(syscall.Sockaddr) Addr) (nfd *netFD, err os.
 	syscall.ForkLock.RUnlock()
 
 	// Associate our new socket with IOCP.
-	once.Do(startServer)
+	onceStartServer.Do(startServer)
 	if _, e = syscall.CreateIoCompletionPort(int32(s), pollserver.iocp, 0, 0); e != 0 {
 		return nil, &OpError{"CreateIoCompletionPort", fd.net, fd.laddr, os.Errno(e)}
 	}

src/pkg/net/iprawsock.go

@@ -7,11 +7,13 @@
 package net
 
 import (
-	"once"
 	"os"
+	"sync"
 	"syscall"
 )
 
+var onceReadProtocols sync.Once
+
 func sockaddrToIP(sa syscall.Sockaddr) Addr {
 	switch sa := sa.(type) {
 	case *syscall.SockaddrInet4:
@@ -284,7 +286,7 @@ func readProtocols() {
 }
 
 func netProtoSplit(netProto string) (net string, proto int, err os.Error) {
-	once.Do(readProtocols)
+	onceReadProtocols.Do(readProtocols)
 	i := last(netProto, ':')
 	if i+1 >= len(netProto) { // no colon
 		return "", 0, os.ErrorString("no IP protocol specified")

src/pkg/net/port.go

@@ -7,12 +7,13 @@
 package net
 
 import (
-	"once"
 	"os"
+	"sync"
 )
 
 var services map[string]map[string]int
 var servicesError os.Error
+var onceReadServices sync.Once
 
 func readServices() {
 	services = make(map[string]map[string]int)
@@ -49,7 +50,7 @@ func readServices() {
 
 // LookupPort looks up the port for the given network and service.
 func LookupPort(network, service string) (port int, err os.Error) {
-	once.Do(readServices)
+	onceReadServices.Do(readServices)
 
 	switch network {
 	case "tcp4", "tcp6":

src/pkg/os/env.go

@@ -7,13 +7,14 @@
 package os
 
 import (
-	"once"
+	"sync"
 )
 
 // ENOENV is the Error indicating that an environment variable does not exist.
 var ENOENV = NewError("no such environment variable")
 
 var env map[string]string
+var once sync.Once
 
 
 func copyenv() {

src/pkg/rpc/server_test.go

@@ -9,14 +9,15 @@ import (
 	"http"
 	"log"
 	"net"
-	"once"
 	"os"
 	"strings"
+	"sync"
 	"testing"
 )
 
 var serverAddr string
 var httpServerAddr string
+var once sync.Once
 
 const second = 1e9
 

src/pkg/time/tick.go

@@ -5,7 +5,7 @@
 package time
 
 import (
-	"once"
+	"sync"
 )
 
 // A Ticker holds a synchronous channel that delivers `ticks' of a clock
@@ -156,6 +156,8 @@ func tickerLoop() {
 	}
 }
 
+var onceStartTickerLoop sync.Once
+
 // NewTicker returns a new Ticker containing a channel that will
 // send the time, in nanoseconds, every ns nanoseconds.  It adjusts the
 // intervals to make up for pauses in delivery of the ticks.
@@ -165,7 +167,7 @@ func NewTicker(ns int64) *Ticker {
 	}
 	c := make(chan int64, 1) //  See comment on send in tickerLoop
 	t := &Ticker{c, c, ns, false, Nanoseconds() + ns, nil}
-	once.Do(startTickerLoop)
+	onceStartTickerLoop.Do(startTickerLoop)
 	// must be run in background so global Tickers can be created
 	go func() { newTicker <- t }()
 	return t

src/pkg/time/zoneinfo.go

@@ -203,6 +203,7 @@ func readinfofile(name string) ([]zonetime, bool) {
 }
 
 var zones []zonetime
+var onceSetupZone sync.Once
 
 func setupZone() {
 	// consult $TZ to find the time zone to use.
@@ -223,7 +224,7 @@ func setupZone() {
 
 // Look up the correct time zone (daylight savings or not) for the given unix time, in the current location.
 func lookupTimezone(sec int64) (zone string, offset int) {
-	once.Do(setupZone)
+	onceSetupZone.Do(setupZone)
 	if len(zones) == 0 {
 		return "UTC", 0
 	}

src/pkg/time/zoneinfo_unix.go

@@ -11,8 +11,8 @@ package time
 
 import (
 	"io/ioutil"
-	"once"
 	"os"
+	"sync"
 )
 
 const (
@@ -203,6 +203,7 @@ func readinfofile(name string) ([]zonetime, bool) {
 }
 
 var zones []zonetime
+var onceSetupZone sync.Once
 
 func setupZone() {
 	// consult $TZ to find the time zone to use.
@@ -223,7 +224,7 @@ func setupZone() {
 
 // Look up the correct time zone (daylight savings or not) for the given unix time, in the current location.
 func lookupTimezone(sec int64) (zone string, offset int) {
-	once.Do(setupZone)
+	onceSetupZone.Do(setupZone)
 	if len(zones) == 0 {
 		return "UTC", 0
 	}
@@ -251,7 +252,7 @@ func lookupTimezone(sec int64) (zone string, offset int) {
 // For a system in Sydney, "EST" and "EDT", though they have
 // different meanings than they do in New York.
 func lookupByName(name string) (off int, found bool) {
-	once.Do(setupZone)
+	onceSetupZone.Do(setupZone)
 	for _, z := range zones {
 		if name == z.zone.name {
 			return z.zone.utcoff, true

src/pkg/time/zoneinfo_windows.go

@@ -6,8 +6,8 @@ package time
 
 import (
 	"syscall"
-	"os"
 	"once"
+	"os"
 )
 
 // BUG(brainman): The Windows implementation assumes that
@@ -121,6 +121,7 @@ func (zi *zoneinfo) pickZone(t *Time) *zone {
 
 var tz zoneinfo
 var initError os.Error
+var onceSetupZone sync.Once
 
 func setupZone() {
 	var i syscall.Timezoneinformation
@@ -145,7 +146,7 @@ func setupZone() {
 
 // Look up the correct time zone (daylight savings or not) for the given unix time, in the current location.
 func lookupTimezone(sec int64) (zone string, offset int) {
-	once.Do(setupZone)
+	onceSetupZone.Do(setupZone)
 	if initError != nil {
 		return "", 0
 	}
@@ -174,7 +175,7 @@ func lookupTimezone(sec int64) (zone string, offset int) {
 // time zone with the given abbreviation. It only considers
 // time zones that apply to the current system.
 func lookupByName(name string) (off int, found bool) {
-	once.Do(setupZone)
+	onceSetupZone.Do(setupZone)
 	if initError != nil {
 		return 0, false
 	}

src/pkg/websocket/websocket_test.go

@@ -11,11 +11,12 @@ import (
 	"io"
 	"log"
 	"net"
-	"once"
+	"sync"
 	"testing"
 )
 
 var serverAddr string
+var once sync.Once
 
 func echoServer(ws *Conn) { io.Copy(ws, ws) }