mirror of
https://github.com/golang/go
synced 2024-11-12 04:40:22 -07:00
assorted changes:
- use a lock instead of a thread in once avoids deadlock in recursive once calls - implement os.Setenv - remove "export" from some scripts - remove _ from names in time package - fix time test for non-MTV machines R=r DELTA=265 (87 added, 58 deleted, 120 changed) OCL=25057 CL=25057
This commit is contained in:
Russ Cox
parent
55d13cf139
commit
ff3173849e
@ -94,11 +94,12 @@ test: test.files
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bignum.6: fmt.dirinstall
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bufio.6: io.dirinstall os.dirinstall
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exec.6: os.dirinstall
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flag.6: fmt.dirinstall
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log.6: fmt.dirinstall io.dirinstall os.dirinstall time.dirinstall
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testing.6: flag.install fmt.dirinstall
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once.6: sync.dirinstall
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strings.6: utf8.install
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exec.6: os.dirinstall
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testing.6: flag.install fmt.dirinstall
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fmt.dirinstall: io.dirinstall reflect.dirinstall strconv.dirinstall
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hash.dirinstall: os.dirinstall
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@ -108,7 +109,7 @@ json.dirinstall: container/array.dirinstall fmt.dirinstall io.dirinstall math.di
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strconv.dirinstall strings.install utf8.install
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# TODO(rsc): net is not supposed to depend on fmt or strings or strconv
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net.dirinstall: fmt.dirinstall once.install os.dirinstall strconv.dirinstall strings.install
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os.dirinstall: syscall.dirinstall
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os.dirinstall: syscall.dirinstall once.install
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regexp.dirinstall: os.dirinstall
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reflect.dirinstall: strconv.dirinstall sync.dirinstall
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strconv.dirinstall: math.dirinstall os.dirinstall utf8.install
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@ -4,74 +4,41 @@
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// For one-time initialization that is not done during init.
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// Wrap the initialization in a niladic function f() and call
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// once.Do(&f)
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// If multiple processes call once.Do(&f) simultaneously
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// once.Do(f)
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// If multiple processes call once.Do(f) simultaneously
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// with the same f argument, only one will call f, and the
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// others will block until f finishes running.
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package once
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type _Job struct {
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import "sync"
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type job struct {
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done bool;
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doit chan bool; // buffer of 1
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sync.Mutex; // should probably be sync.Notification or some such
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}
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type _Request struct {
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f func();
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reply chan *_Job
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}
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var service = make(chan _Request)
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var jobmap = make(map[func()]*_Job)
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// Moderate access to the jobmap.
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// Even if accesses were thread-safe (they should be but are not)
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// something needs to serialize creation of new jobs.
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// That's what the Server does.
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func server() {
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for {
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req := <-service;
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job, present := jobmap[req.f];
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if !present {
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job = new(_Job);
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job.doit = make(chan bool, 1);
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job.doit <- true;
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jobmap[req.f] = job
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}
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req.reply <- job
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}
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}
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var jobs = make(map[func()]*job)
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var joblock sync.Mutex;
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func Do(f func()) {
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// Look for job in map (avoids channel communication).
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// If not there, ask map server to make one.
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// TODO: Uncomment use of jobmap[f] once
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// maps are thread-safe.
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var job *_Job;
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var present bool;
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// job, present = jobmap[f]
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joblock.Lock();
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j, present := jobs[f];
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if !present {
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c := make(chan *_Job);
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service <- _Request(f, c);
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job = <-c
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}
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// Optimization
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if job.done {
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return
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}
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// If we're the first one, job.doit has a true waiting.
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if <-job.doit {
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// run it
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j = new(job);
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j.Lock();
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jobs[f] = j;
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joblock.Unlock();
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f();
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job.done = true
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j.done = true;
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j.Unlock();
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} else {
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// wait for it
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joblock.Unlock();
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if j.done != true {
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j.Lock();
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j.Unlock();
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}
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// Leave a false waiting for the next guy.
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job.doit <- false
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}
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func init() {
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go server()
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}
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@ -3,25 +3,71 @@
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// license that can be found in the LICENSE file.
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// Environment variables.
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// Setenv doesn't exist yet: don't have the run-time hooks yet
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package os
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import os "os"
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import (
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"once";
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"os";
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)
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var (
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ENOENV = NewError("no such environment variable");
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env map[string] string;
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)
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func Getenv(s string) (v string, err *Error) {
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n := len(s);
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if n == 0 {
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return "", EINVAL
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}
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for i, e := range sys.Envs {
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if len(e) > n && e[n] == '=' && e[0:n] == s {
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return e[n+1:len(e)], nil
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func copyenv() {
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env = make(map[string] string);
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for i, s := range sys.Envs {
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for j := 0; j < len(s); j++ {
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if s[j] == '=' {
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env[s[0:j]] = s[j+1:len(s)];
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break;
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}
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}
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return "", ENOENV
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}
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}
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func Getenv(key string) (value string, err *Error) {
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once.Do(copyenv);
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if len(key) == 0 {
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return "", EINVAL;
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}
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v, ok := env[key];
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if !ok {
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return "", ENOENV;
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}
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return v, nil;
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}
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func Setenv(key, value string) *Error {
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once.Do(copyenv);
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if len(key) == 0 {
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return EINVAL;
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}
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env[key] = value;
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return nil;
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}
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func Clearenv() {
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once.Do(copyenv); // prevent copyenv in Getenv/Setenv
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env = make(map[string] string);
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}
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func Environ() []string {
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once.Do(copyenv);
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a := make([]string, len(env));
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i := 0;
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for k, v := range(env) {
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// check i < len(a) for safety,
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// in case env is changing underfoot.
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if i < len(a) {
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a[i] = k + "=" + v;
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i++;
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}
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}
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return a[0:i];
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}
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@ -27,6 +27,9 @@ func ForkExec(argv0 string, argv []string, envv []string, fd []*FD)
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}
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func Exec(argv0 string, argv []string, envv []string) *Error {
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if envv == nil {
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envv = Environ();
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}
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e := syscall.Exec(argv0, argv, envv);
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return ErrnoToError(e);
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}
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@ -10,7 +10,7 @@ print <<EOF;
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package syscall
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export const (
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const (
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EOF
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while(<>){
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@ -11,7 +11,7 @@ print <<EOF;
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package syscall
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export const(
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const(
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EOF
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while(<>){
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@ -25,4 +25,7 @@ while(<>){
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print <<EOF;
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)
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func _darwin_system_call_conflict() {
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}
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EOF
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@ -10,7 +10,7 @@ print <<EOF;
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package syscall
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export const(
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const(
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EOF
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while(<>){
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@ -138,7 +138,7 @@ func SecondsToUTC(sec int64) *Time {
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}
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t.Month = m+1;
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t.Day = yday+1;
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t.Zone = "GMT";
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t.Zone = "UTC";
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return t;
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}
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@ -149,12 +149,12 @@ func UTC() *Time {
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// TODO: Should this return an error?
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func SecondsToLocalTime(sec int64) *Time {
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zone, offset, err := time.LookupTimezone(sec);
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z, offset, err := time.LookupTimezone(sec);
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if err != nil {
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return SecondsToUTC(sec)
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}
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t := SecondsToUTC(sec+int64(offset));
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t.Zone = zone;
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t.Zone = z;
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t.ZoneOffset = offset;
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return t
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}
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@ -5,31 +5,39 @@
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package time
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import (
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"os";
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"testing";
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"time";
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)
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type _TimeTest struct {
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func init() {
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// Force US Pacific time for daylight-savings
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// tests below (localtests). Needs to be set
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// before the first call into the time library.
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os.Setenv("TZ", "US/Pacific");
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}
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type TimeTest struct {
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seconds int64;
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golden Time;
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}
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var utctests = []_TimeTest (
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_TimeTest(0, Time(1970, 1, 1, 0, 0, 0, Thursday, 0, "GMT")),
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_TimeTest(1221681866, Time(2008, 9, 17, 20, 4, 26, Wednesday, 0, "GMT")),
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_TimeTest(-1221681866, Time(1931, 4, 16, 3, 55, 34, Thursday, 0, "GMT")),
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_TimeTest(1e18, Time(31688740476, 10, 23, 1, 46, 40, Friday, 0, "GMT")),
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_TimeTest(-1e18, Time(-31688736537, 3, 10, 22, 13, 20, Tuesday, 0, "GMT")),
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_TimeTest(0x7fffffffffffffff, Time(292277026596, 12, 4, 15, 30, 7, Sunday, 0, "GMT")),
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_TimeTest(-0x8000000000000000, Time(-292277022657, 1, 27, 8, 29, 52, Sunday, 0, "GMT"))
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var utctests = []TimeTest (
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TimeTest(0, Time(1970, 1, 1, 0, 0, 0, Thursday, 0, "UTC")),
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TimeTest(1221681866, Time(2008, 9, 17, 20, 4, 26, Wednesday, 0, "UTC")),
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TimeTest(-1221681866, Time(1931, 4, 16, 3, 55, 34, Thursday, 0, "UTC")),
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TimeTest(1e18, Time(31688740476, 10, 23, 1, 46, 40, Friday, 0, "UTC")),
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TimeTest(-1e18, Time(-31688736537, 3, 10, 22, 13, 20, Tuesday, 0, "UTC")),
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TimeTest(0x7fffffffffffffff, Time(292277026596, 12, 4, 15, 30, 7, Sunday, 0, "UTC")),
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TimeTest(-0x8000000000000000, Time(-292277022657, 1, 27, 8, 29, 52, Sunday, 0, "UTC"))
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)
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var localtests = []_TimeTest (
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_TimeTest(0, Time(1969, 12, 31, 16, 0, 0, Wednesday, -8*60*60, "PST")),
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_TimeTest(1221681866, Time(2008, 9, 17, 13, 4, 26, Wednesday, -7*60*60, "PDT"))
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var localtests = []TimeTest (
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TimeTest(0, Time(1969, 12, 31, 16, 0, 0, Wednesday, -8*60*60, "PST")),
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TimeTest(1221681866, Time(2008, 9, 17, 13, 4, 26, Wednesday, -7*60*60, "PDT"))
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)
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func _Same(t, u *Time) bool {
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func same(t, u *Time) bool {
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return t.Year == u.Year
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&& t.Month == u.Month
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&& t.Day == u.Day
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@ -50,7 +58,7 @@ func TestSecondsToUTC(t *testing.T) {
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if newsec != sec {
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t.Errorf("SecondsToUTC(%d).Seconds() = %d", sec, newsec);
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}
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if !_Same(tm, golden) {
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if !same(tm, golden) {
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t.Errorf("SecondsToUTC(%d):", sec);
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t.Errorf(" want=%v", *golden);
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t.Errorf(" have=%v", *tm);
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@ -67,7 +75,7 @@ func TestSecondsToLocalTime(t *testing.T) {
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if newsec != sec {
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t.Errorf("SecondsToLocalTime(%d).Seconds() = %d", sec, newsec);
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}
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if !_Same(tm, golden) {
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if !same(tm, golden) {
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t.Errorf("SecondsToLocalTime(%d):", sec);
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t.Errorf(" want=%v", *golden);
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t.Errorf(" have=%v", *tm);
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@ -16,8 +16,10 @@ import (
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)
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const (
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_MaxFileSize = 8192; // actual files are closer to 1K
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_HeaderSize = 4+16+4*7
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maxFileSize = 8192; // actual files are closer to 1K
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headerSize = 4+16+4*7;
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zoneDir = "/usr/share/zoneinfo/";
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)
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var (
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@ -26,13 +28,13 @@ var (
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)
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// Simple I/O interface to binary blob of data.
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type _Data struct {
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type data struct {
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p []byte;
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error bool;
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}
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func (d *_Data) Read(n int) []byte {
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func (d *data) read(n int) []byte {
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if len(d.p) < n {
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d.p = nil;
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d.error = true;
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@ -43,8 +45,8 @@ func (d *_Data) Read(n int) []byte {
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return p
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}
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func (d *_Data) Big4() (n uint32, ok bool) {
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p := d.Read(4);
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func (d *data) big4() (n uint32, ok bool) {
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p := d.read(4);
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if len(p) < 4 {
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d.error = true;
|
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return 0, false
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@ -52,8 +54,8 @@ func (d *_Data) Big4() (n uint32, ok bool) {
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return uint32(p[0]) << 24 | uint32(p[1]) << 16 | uint32(p[2]) << 8 | uint32(p[3]), true
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}
|
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|
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func (d *_Data) Byte() (n byte, ok bool) {
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p := d.Read(1);
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func (d *data) byte() (n byte, ok bool) {
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p := d.read(1);
|
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if len(p) < 1 {
|
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d.error = true;
|
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return 0, false
|
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@ -63,7 +65,7 @@ func (d *_Data) Byte() (n byte, ok bool) {
|
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|
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|
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// Make a string by stopping at the first NUL
|
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func _ByteString(p []byte) string {
|
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func byteString(p []byte) string {
|
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for i := 0; i < len(p); i++ {
|
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if p[i] == 0 {
|
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return string(p[0:i])
|
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@ -73,31 +75,29 @@ func _ByteString(p []byte) string {
|
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}
|
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|
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// Parsed representation
|
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type _Zone struct {
|
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type zone struct {
|
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utcoff int;
|
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isdst bool;
|
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name string;
|
||||
}
|
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|
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type _Zonetime struct {
|
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type zonetime struct {
|
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time int32; // transition time, in seconds since 1970 GMT
|
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zone *_Zone; // the zone that goes into effect at that time
|
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zone *zone; // the zone that goes into effect at that time
|
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isstd, isutc bool; // ignored - no idea what these mean
|
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}
|
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|
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func parseinfo(bytes []byte) (zt []_Zonetime, err *os.Error) {
|
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|
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data1 := _Data(bytes, false);
|
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data := &data1;
|
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func parseinfo(bytes []byte) (zt []zonetime, err *os.Error) {
|
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d := data(bytes, false);
|
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|
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// 4-byte magic "TZif"
|
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if magic := data.Read(4); string(magic) != "TZif" {
|
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if magic := d.read(4); string(magic) != "TZif" {
|
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return nil, BadZoneinfo
|
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}
|
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|
||||
// 1-byte version, then 15 bytes of padding
|
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var p []byte;
|
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if p = data.Read(16); len(p) != 16 || p[0] != 0 && p[0] != '2' {
|
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if p = d.read(16); len(p) != 16 || p[0] != 0 && p[0] != '2' {
|
||||
return nil, BadZoneinfo
|
||||
}
|
||||
vers := p[0];
|
||||
@ -119,7 +119,7 @@ func parseinfo(bytes []byte) (zt []_Zonetime, err *os.Error) {
|
||||
)
|
||||
var n [6]int;
|
||||
for i := 0; i < 6; i++ {
|
||||
nn, ok := data.Big4();
|
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nn, ok := d.big4();
|
||||
if !ok {
|
||||
return nil, BadZoneinfo
|
||||
}
|
||||
@ -127,32 +127,29 @@ func parseinfo(bytes []byte) (zt []_Zonetime, err *os.Error) {
|
||||
}
|
||||
|
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// Transition times.
|
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txtimes1 := _Data(data.Read(n[NTime]*4), false);
|
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txtimes := &txtimes1;
|
||||
txtimes := data(d.read(n[NTime]*4), false);
|
||||
|
||||
// Time zone indices for transition times.
|
||||
txzones := data.Read(n[NTime]);
|
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txzones := d.read(n[NTime]);
|
||||
|
||||
// Zone info structures
|
||||
zonedata1 := _Data(data.Read(n[NZone]*6), false);
|
||||
zonedata := &zonedata1;
|
||||
zonedata := data(d.read(n[NZone]*6), false);
|
||||
|
||||
// Time zone abbreviations.
|
||||
abbrev := data.Read(n[NChar]);
|
||||
abbrev := d.read(n[NChar]);
|
||||
|
||||
// Leap-second time pairs
|
||||
leapdata1 := _Data(data.Read(n[NLeap]*8), false);
|
||||
leapdata := &leapdata1;
|
||||
leapdata := data(d.read(n[NLeap]*8), false);
|
||||
|
||||
// Whether tx times associated with local time types
|
||||
// are specified as standard time or wall time.
|
||||
isstd := data.Read(n[NStdWall]);
|
||||
isstd := d.read(n[NStdWall]);
|
||||
|
||||
// Whether tx times associated with local time types
|
||||
// are specified as UTC or local time.
|
||||
isutc := data.Read(n[NUTCLocal]);
|
||||
isutc := d.read(n[NUTCLocal]);
|
||||
|
||||
if data.error { // ran out of data
|
||||
if d.error { // ran out of data
|
||||
return nil, BadZoneinfo
|
||||
}
|
||||
|
||||
@ -163,38 +160,38 @@ func parseinfo(bytes []byte) (zt []_Zonetime, err *os.Error) {
|
||||
// Now we can build up a useful data structure.
|
||||
// First the zone information.
|
||||
// utcoff[4] isdst[1] nameindex[1]
|
||||
zone := make([]_Zone, n[NZone]);
|
||||
for i := 0; i < len(zone); i++ {
|
||||
z := make([]zone, n[NZone]);
|
||||
for i := 0; i < len(z); i++ {
|
||||
var ok bool;
|
||||
var n uint32;
|
||||
if n, ok = zonedata.Big4(); !ok {
|
||||
if n, ok = zonedata.big4(); !ok {
|
||||
return nil, BadZoneinfo
|
||||
}
|
||||
zone[i].utcoff = int(n);
|
||||
z[i].utcoff = int(n);
|
||||
var b byte;
|
||||
if b, ok = zonedata.Byte(); !ok {
|
||||
if b, ok = zonedata.byte(); !ok {
|
||||
return nil, BadZoneinfo
|
||||
}
|
||||
zone[i].isdst = b != 0;
|
||||
if b, ok = zonedata.Byte(); !ok || int(b) >= len(abbrev) {
|
||||
z[i].isdst = b != 0;
|
||||
if b, ok = zonedata.byte(); !ok || int(b) >= len(abbrev) {
|
||||
return nil, BadZoneinfo
|
||||
}
|
||||
zone[i].name = _ByteString(abbrev[b:len(abbrev)])
|
||||
z[i].name = byteString(abbrev[b:len(abbrev)])
|
||||
}
|
||||
|
||||
// Now the transition time info.
|
||||
zt = make([]_Zonetime, n[NTime]);
|
||||
zt = make([]zonetime, n[NTime]);
|
||||
for i := 0; i < len(zt); i++ {
|
||||
var ok bool;
|
||||
var n uint32;
|
||||
if n, ok = txtimes.Big4(); !ok {
|
||||
if n, ok = txtimes.big4(); !ok {
|
||||
return nil, BadZoneinfo
|
||||
}
|
||||
zt[i].time = int32(n);
|
||||
if int(txzones[i]) >= len(zone) {
|
||||
if int(txzones[i]) >= len(z) {
|
||||
return nil, BadZoneinfo
|
||||
}
|
||||
zt[i].zone = &zone[txzones[i]];
|
||||
zt[i].zone = &z[txzones[i]];
|
||||
if i < len(isstd) {
|
||||
zt[i].isstd = isstd[i] != 0
|
||||
}
|
||||
@ -208,52 +205,56 @@ func parseinfo(bytes []byte) (zt []_Zonetime, err *os.Error) {
|
||||
func readfile(name string, max int) (p []byte, err *os.Error) {
|
||||
fd, e := os.Open(name, os.O_RDONLY, 0);
|
||||
if e != nil {
|
||||
return nil, e
|
||||
return nil, e;
|
||||
}
|
||||
p = make([]byte, max+1)[0:0];
|
||||
n := 0;
|
||||
for len(p) < max {
|
||||
nn, e := fd.Read(p[n:cap(p)]);
|
||||
if e != nil {
|
||||
p = make([]byte, max);
|
||||
n, err1 := io.Readn(fd, p);
|
||||
fd.Close();
|
||||
return nil, e
|
||||
if err1 == nil { // too long
|
||||
return nil, BadZoneinfo;
|
||||
}
|
||||
if nn == 0 {
|
||||
fd.Close();
|
||||
return p, nil
|
||||
if err1 != io.ErrEOF {
|
||||
return nil, err1;
|
||||
}
|
||||
p = p[0:n+nn]
|
||||
}
|
||||
fd.Close();
|
||||
return nil, BadZoneinfo // too long
|
||||
return p[0:n], nil;
|
||||
}
|
||||
|
||||
|
||||
func readinfofile(name string) (tx []_Zonetime, err *os.Error) {
|
||||
data, e := readfile(name, _MaxFileSize);
|
||||
func readinfofile(name string) (tx []zonetime, err *os.Error) {
|
||||
buf, e := readfile(name, maxFileSize);
|
||||
if e != nil {
|
||||
return nil, e
|
||||
}
|
||||
tx, err = parseinfo(data);
|
||||
tx, err = parseinfo(buf);
|
||||
return tx, err
|
||||
}
|
||||
|
||||
var zones []_Zonetime
|
||||
var zones []zonetime
|
||||
var zoneerr *os.Error
|
||||
|
||||
func _SetupZone() {
|
||||
// TODO: /etc/localtime is the default time zone info
|
||||
// for the system, but libc allows setting an environment
|
||||
// variable in order to direct reading a different file
|
||||
// (in /usr/share/zoneinfo). We should check that
|
||||
// environment variable.
|
||||
func setupZone() {
|
||||
// consult $TZ to find the time zone to use.
|
||||
// no $TZ means use the system default /etc/localtime.
|
||||
// $TZ="" means use UTC.
|
||||
// $TZ="foo" means use /usr/share/zoneinfo/foo.
|
||||
|
||||
tz, err := os.Getenv("TZ");
|
||||
var file string;
|
||||
switch {
|
||||
case err == os.ENOENV:
|
||||
zones, zoneerr = readinfofile("/etc/localtime");
|
||||
case err != nil:
|
||||
zoneerr = err;
|
||||
case len(tz) > 0:
|
||||
zones, zoneerr = readinfofile(zoneDir + tz);
|
||||
case len(tz) == 0:
|
||||
// do nothing: use UTC
|
||||
}
|
||||
}
|
||||
|
||||
func LookupTimezone(sec int64) (zone string, offset int, err *os.Error) {
|
||||
once.Do(_SetupZone);
|
||||
once.Do(setupZone);
|
||||
if zoneerr != nil || len(zones) == 0 {
|
||||
return "GMT", 0, zoneerr
|
||||
return "UTC", 0, zoneerr
|
||||
}
|
||||
|
||||
// Binary search for entry with largest time <= sec
|
||||
|
||||
Loading…
Reference in New Issue
Block a user