bug016.go:11:8: error: negative shift count

R=rsc, gri
CC=golang-dev
https://golang.org/cl/4312055

R=rsc
CC=golang-dev
https://golang.org/cl/4314042

R=rsc
CC=golang-dev
https://golang.org/cl/4298060

R=iant, rsc, brainman
CC=golang-dev
https://golang.org/cl/4306042

R=rsc
CC=golang-dev
https://golang.org/cl/4312054

bug274.go:23:3: error: missing statement after label
bug274.go:25:3: error: missing statement after label
bug274.go:28:3: error: label ‘L2’ defined and not used

R=rsc
CC=golang-dev
https://golang.org/cl/4273114

Fixes #1615.
This time for sure.

R=rsc, gri
CC=golang-dev
https://golang.org/cl/4275079

Fixes #1641.

Actually it side steps the real issue, which is that the
setitimer(2) implementation on OS X is not useful for
profiling of multi-threaded programs.  I filed the below
using the Apple Bug Reporter.

/*
Filed as Apple Bug Report #9177434.

This program creates a new pthread that loops, wasting cpu time.
In the main pthread, it sleeps on a condition that will never come true.
Before doing so it sets up an interval timer using ITIMER_PROF.
The handler prints a message saying which thread it is running on.

POSIX does not specify which thread should receive the signal, but
in order to be useful in a user-mode self-profiler like pprof or gprof
   http://code.google.com/p/google-perftools
   http://www.delorie.com/gnu/docs/binutils/gprof_25.html
it is important that the thread that receives the signal is the one
whose execution caused the timer to expire.

Linux and FreeBSD handle this by sending the signal to the process's
queue but delivering it to the current thread if possible:

   http://lxr.linux.no/linux+v2.6.38/kernel/signal.c#L802
     807        /*
     808         * Now find a thread we can wake up to take the signal off the queue.
     809         *
     810         * If the main thread wants the signal, it gets first crack.
     811         * Probably the least surprising to the average bear.
     812         * /

   http://fxr.watson.org/fxr/source/kern/kern_sig.c?v=FREEBSD8;im=bigexcerpts#L1907
     1914         /*
     1915          * Check if current thread can handle the signal without
     1916          * switching context to another thread.
     1917          * /

On those operating systems, this program prints:

    $ ./a.out
    signal on cpu-chewing looper thread
    signal on cpu-chewing looper thread
    signal on cpu-chewing looper thread
    signal on cpu-chewing looper thread
    signal on cpu-chewing looper thread
    signal on cpu-chewing looper thread
    signal on cpu-chewing looper thread
    signal on cpu-chewing looper thread
    signal on cpu-chewing looper thread
    signal on cpu-chewing looper thread
    $

The OS X kernel does not have any such preference.  Its get_signalthread
does not prefer current_thread(), in contrast to the other two systems,
so the signal gets delivered to the first thread in the list that is able to
handle it, which ends up being the main thread in this experiment.
http://fxr.watson.org/fxr/source/bsd/kern/kern_sig.c?v=xnu-1456.1.26;im=excerpts#L1666

    $ ./a.out
    signal on sleeping main thread
    signal on sleeping main thread
    signal on sleeping main thread
    signal on sleeping main thread
    signal on sleeping main thread
    signal on sleeping main thread
    signal on sleeping main thread
    signal on sleeping main thread
    signal on sleeping main thread
    signal on sleeping main thread
    $

The fix is to make get_signalthread use the same heuristic as
Linux and FreeBSD, namely to use current_thread() if possible
before scanning the process thread list.

*/

#include <sys/time.h>
#include <sys/signal.h>
#include <pthread.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

static void handler(int);
static void* looper(void*);

static pthread_t pmain, ploop;

int
main(void)
{
        struct itimerval it;
        struct sigaction sa;
        pthread_cond_t cond;
        pthread_mutex_t mu;

        memset(&sa, 0, sizeof sa);
        sa.sa_handler = handler;
        sa.sa_flags = SA_RESTART;
        memset(&sa.sa_mask, 0xff, sizeof sa.sa_mask);
        sigaction(SIGPROF, &sa, 0);

        pmain = pthread_self();
        pthread_create(&ploop, 0, looper, 0);

        memset(&it, 0, sizeof it);
        it.it_interval.tv_usec = 10000;
        it.it_value = it.it_interval;
        setitimer(ITIMER_PROF, &it, 0);

        pthread_mutex_init(&mu, 0);
        pthread_mutex_lock(&mu);

        pthread_cond_init(&cond, 0);
        for(;;)
                pthread_cond_wait(&cond, &mu);

        return 0;
}

static void
handler(int sig)
{
        static int nsig;
        pthread_t p;

        p = pthread_self();
        if(p == pmain)
                printf("signal on sleeping main thread\n");
        else if(p == ploop)
                printf("signal on cpu-chewing looper thread\n");
        else
                printf("signal on %p\n", (void*)p);
        if(++nsig >= 10)
                exit(0);
}

static void*
looper(void *v)
{
        for(;;);
}

R=r
CC=golang-dev
https://golang.org/cl/4273113

label.go:30:1: error: label ‘L6’ already defined
label.go:28:1: note: previous definition of ‘L6’ was here
label.go:23:1: error: label ‘L4’ defined and not used
label.go:52:2: error: label ‘defalt’ defined and not used
label.go:17:1: error: label ‘L2’ defined and not used
label.go:26:1: error: label ‘L5’ defined and not used
label.go:20:1: error: label ‘L3’ defined and not used
label.go:14:1: error: label ‘L1’ defined and not used

label1.go:32:13: error: invalid continue label ‘L2’
label1.go:44:13: error: invalid continue label ‘L3’
label1.go:52:10: error: invalid break label ‘L4’
label1.go:55:13: error: invalid continue label ‘L4’
label1.go:65:9: error: invalid break label ‘L5’
label1.go:68:12: error: invalid continue label ‘L5’
label1.go:76:10: error: invalid break label ‘L1’
label1.go:79:13: error: invalid continue label ‘L1’

R=rsc
CC=golang-dev
https://golang.org/cl/4275078

Also fix comment.

The only caller of chanrecv initializes the value to false, so
this patch makes no difference at present.  But it seems like
the right thing to do.

R=rsc
CC=golang-dev
https://golang.org/cl/4312053

R=rsc
CC=golang-dev
https://golang.org/cl/4309049

R=r
CC=golang-dev
https://golang.org/cl/4280060

Fixes #1639

R=golang-dev, bradfitzgo
CC=golang-dev
https://golang.org/cl/4291069

R=adg, dfc, r
CC=golang-dev
https://golang.org/cl/4296042

R=golang-dev
CC=golang-dev
https://golang.org/cl/4276077

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/4273102

Correctly distinguish between lhs and rhs identifiers
and resolve/declare them accordingly.

Collect field and method names in respective scopes
(will be available after some minor AST API changes).

Also collect imports since it's useful to have that
list directly w/o having to re-traverse the AST
(will also be available after some minor AST API changes).

No external API changes in this CL.

R=rsc, rog
CC=golang-dev
https://golang.org/cl/4271061

Change M-x gofmt to display errors in a new buffer instead of
clobbering the current buffer.

Add gofmt-before-save, which runs gofmt when in go-mode.  This
can be used with before-save-hook.  Add to your .emacs:
  (add-hook 'before-save-hook 'gofmt-before-save)

R=rsc, aclements, amdragon
CC=golang-dev
https://golang.org/cl/4276059

The top level bytes.Buffer is always there and can be re-used.
Rpc goes from 83 to 79 mallocs per round trip.

R=rsc
CC=golang-dev
https://golang.org/cl/4271062

R=rsc
CC=golang-dev
https://golang.org/cl/4285063

- StartProcess will work with relative (to attr.Dir, not
  current directory) executable filenames
- StartProcess will only work if executable filename points
  to the real file, it will not search for executable in the
  $PATH list and others (see CreateProcess manual for details)
- StartProcess argv strings can contain any characters

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4306041

doc: refer to golang-dev instead of -nuts in contribute.html

R=r, rsc
CC=golang-dev
https://golang.org/cl/4309043

R=r
CC=golang-dev
https://golang.org/cl/4272066

5l was already correct, clarified comment and added diags for unmaintained code.

R=rsc
CC=golang-dev
https://golang.org/cl/4277070

rsc's earlier fix, plus tests.

R=rsc
CC=golang-dev
https://golang.org/cl/4285062

R=rsc, r
CC=golang-dev
https://golang.org/cl/4287074

R=rsc, iant
CC=golang-dev
https://golang.org/cl/4271060

R=gri
CC=golang-dev
https://golang.org/cl/4295062

R=r, bradfitzgo, r2
CC=golang-dev
https://golang.org/cl/4313041

This patch adds a connection cache and keep-alive
support to Transport, which is used by the
HTTP client.

It's also structured such that it's easy to add
HTTP pipelining in the future.

R=rsc, petar-m, bradfitzwork, r
CC=golang-dev
https://golang.org/cl/4272045

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4274079

R=r
CC=golang-dev
https://golang.org/cl/4306043

R=r
CC=golang-dev
https://golang.org/cl/4280061

R=iant
CC=golang-dev
https://golang.org/cl/4291063

R=r
CC=golang-dev
https://golang.org/cl/4273097

Found by stkcheck after 6l, 8l bug fixes Luuk is about to submit.

R=lvd
CC=golang-dev
https://golang.org/cl/4306047

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/4284058

R=adg, r
CC=golang-dev
https://golang.org/cl/4285059

Fixes #1631.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4303046

malloc rather than nelements + 1.

R=rob
CC=golang-dev
https://golang.org/cl/4291064