It is possible that Linux and Windows copy the FP control word
from the parent thread when creating a new thread.  Empirically,
Darwin does not.  Reset the FP control world in all cases.

Enable the floating-point strconv test.

Fixes #2917 (again).

R=golang-dev, r, iant
CC=golang-dev
https://golang.org/cl/5660047

Fixes #2930.

R=r, gri, rsc
CC=golang-dev
https://golang.org/cl/5657048

R=ken2
CC=golang-dev
https://golang.org/cl/5666043

Fixes #3014

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5665043

R=bsiegert, rsc, r
CC=golang-dev
https://golang.org/cl/5605047

R=rsc, bradfitz
CC=golang-dev
https://golang.org/cl/5661055

This CL provides regenerated z-files for OpenBSD 5.0 stable.
Also fixes OpenBSD build.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5656052

Once we've evicted all the blocked I/O, the ref count
should go to zero quickly, so it should be safe to
postpone the close(2) until then.

Fixes #1898.
Fixes #2116.
Fixes #2122.

R=golang-dev, mikioh.mikioh, bradfitz, fullung, iant
CC=golang-dev
https://golang.org/cl/5649076

Alpha GNU/Linux does not have /proc/net/igmp[6].

R=golang-dev, rsc, bradfitz
CC=golang-dev
https://golang.org/cl/5663047

Also check for old and exp.

Fixes #2764.
Fixes #2765.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5654068

Fixes #2895.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5651055

R=golang-dev, gri, bradfitz
CC=golang-dev
https://golang.org/cl/5658046

Filed issue 3016 to fix this, but I really want
to see a "ok" in the Windows column so we
know what is and is not working.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5658050

Now with a bit more paranoia and lower number of requests
to keep it under the default OS X 256 fd limit.

R=golang-dev, dsymonds, rsc
CC=golang-dev
https://golang.org/cl/5659051

Typing ^\ delivers the SIGQUIT to all threads, it appears.

R=golang-dev, r, iant
CC=golang-dev
https://golang.org/cl/5657044

TBR=r
CC=golang-dev
https://golang.org/cl/5661053

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5658049

TBR=golang-dev
CC=golang-dev
https://golang.org/cl/5656051

It's not as pretty, but it deletes some irrelevant information from the
printout and avoids a dependency.
It also means the test binary will stop if a test panics. That's a feature,
not a bug.
Any output printed by the test appears before the panic traceback.

before:

--- FAIL: TestPanic (0.00 seconds)
        fmt_test.go:19: HI
        testing.go:257: runtime error: index out of range
                /Users/r/go/src/pkg/testing/testing.go:257 (0x23998)
                        _func_003: t.Logf("%s\n%s", err, debug.Stack())
                /Users/r/go/src/pkg/runtime/proc.c:1388 (0x10d2d)
                        panic: reflect·call(d->fn, d->args, d->siz);
                /Users/r/go/src/pkg/runtime/runtime.c:128 (0x119b0)
                        panicstring: runtime·panic(err);
                /Users/r/go/src/pkg/runtime/runtime.c:85 (0x11857)
                        panicindex: runtime·panicstring("index out of range");
                /Users/r/go/src/pkg/fmt/fmt_test.go:21 (0x23d72)
                        TestPanic: a[10]=1
                /Users/r/go/src/pkg/testing/testing.go:264 (0x21b75)
                        tRunner: test.F(t)
                /Users/r/go/src/pkg/runtime/proc.c:258 (0xee9e)
                        goexit: runtime·goexit(void)
FAIL

after:

--- FAIL: TestPanic (0.00 seconds)
        fmt_test.go:19: HI
panic: runtime error: index out of range [recovered]
        panic: (*testing.T) (0xec3b0,0xf8400001c0)

goroutine 2 [running]:
testing._func_003(0x21f5fa8, 0x21f5100, 0x21f5fb8, 0x21f5e88)
        /Users/r/go/src/pkg/testing/testing.go:259 +0x108
----- stack segment boundary -----
fmt_test.TestPanic(0xf8400001c0, 0x27603728)
        /Users/r/go/src/pkg/fmt/fmt_test.go:21 +0x6b
testing.tRunner(0xf8400001c0, 0x18edb8, 0x0, 0x0)
        /Users/r/go/src/pkg/testing/testing.go:264 +0x6f
created by testing.RunTests
        /Users/r/go/src/pkg/testing/testing.go:343 +0x76e

goroutine 1 [chan receive]:
testing.RunTests(0x2000, 0x18edb8, 0x2400000024, 0x100000001, 0x200000001, ...)
        /Users/r/go/src/pkg/testing/testing.go:344 +0x791
testing.Main(0x2000, 0x18edb8, 0x2400000024, 0x188a58, 0x800000008, ...)
        /Users/r/go/src/pkg/testing/testing.go:275 +0x62
main.main()
        /var/folders/++/+++Fn+++6+0++4RjPqRgNE++2Qk/-Tmp-/go-build743922747/fmt/_test/_testmain.go:129 +0x91
exit status 2

R=rsc, dsymonds
CC=golang-dev
https://golang.org/cl/5658048

Fixes #2897.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5658047

Fixes #3008.

R=rsc
CC=golang-dev
https://golang.org/cl/5660046

Should fix build breakage.

TBR=golang-dev
CC=golang-dev
https://golang.org/cl/5656050

This CL makes it possible to run make.bash with
GOOS and GOARCH set to something other than
the native host GOOS and GOARCH.

As part of the CL, the tool directory moves from bin/tool/
to pkg/tool/goos_goarch where goos and goarch are
the values for the host system (running the build), not
the target.  pkg/ is not technically appropriate, but C objects
are there now tool (pkg/obj/) so this puts all the generated
binaries in one place (rm -rf $GOROOT/pkg cleans everything).
Including goos_goarch in the name allows different systems
to share a single $GOROOT on a shared file system.

Fixes #2920.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5645093

Generates an infinite stream (at least >1GB) of:

=== RUN TestTransportPersistConnLeak
2012/02/13 22:20:19 http: Accept error: accept tcp 127.0.0.1:63972:
too many open files
2012/02/13 22:20:19 http: Accept error: accept tcp 127.0.0.1:63972:
too many open files
2012/02/13 22:20:19 http: Accept error: accept tcp 127.0.0.1:63972:
too many open files
2012/02/13 22:20:19 http: Accept error: accept tcp 127.0.0.1:63972:
too many open files
2012/02/13 22:20:19 http: Accept error: accept tcp 127.0.0.1:63972:
too many open files
2012/02/13 22:20:19 http: Accept error: accept tcp 127.0.0.1:63972:
too many open files
2012/02/13 22:20:19 http: Accept error: accept tcp 127.0.0.1:63972:
too many open files
2012/02/13 22:20:19 http: Accept error: accept tcp 127.0.0.1:63972:
too many open files
2012/02/13 22:20:19 http: Accept error: accept tcp 127.0.0.1:63972:
too many open files
2012/02/13 22:20:19 http: Accept error: accept tcp 127.0.0.1:63972:
too many open files

R=bradfitz
CC=golang-dev
https://golang.org/cl/5661052

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5656048

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5661051

Thanks to Sascha Matzke & Florian Weimer for diagnosing.

R=golang-dev, adg, bradfitz, kevlar
CC=golang-dev
https://golang.org/cl/5656046

Fixes #2941

R=golang-dev, rsc, adg
CC=golang-dev
https://golang.org/cl/5663046

R=gri, r
CC=golang-dev
https://golang.org/cl/5659048

        1, IMO, the fatal error "regfree: not a register" from 5g when
         compiling runtime/debug.go is due to gcc miscompile, it doesn't
         show up when compiled with -O0. But I still haven't thought of
         a way to fix this, should all ARM builds be built with -O0?
        2, fixed mksysnum_linux.pl, so zsysnum_linux_arm.go no longer
        needs to be hand-generated.
        3, regen all in pkg syscall for Linux/ARM on Debian 6.0
This CL is somewhat big, I'd like to split it if necessary.

R=rsc, dave
CC=golang-dev
https://golang.org/cl/5659044

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5657047

This was an implementation detail that snuck into the public interface.
*Writer.Create gives you an io.Writer, the *Writer itself was never
meant to be written to.

R=golang-dev, dsymonds, r
CC=golang-dev
https://golang.org/cl/5654076

R=rsc
CC=golang-dev
https://golang.org/cl/5659045

I remembered that sendfile support was lacking a test.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5652079

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5661047

Makes files like src/pkg/syscall/ztypes_linux_amd64.go easier to read.
(The copy that is checked in predates the //line output mode,
so this also preserves the status quo.)

R=golang-dev, iant, gri
CC=golang-dev
https://golang.org/cl/5655068

Fixes #2905.

R=golang-dev, bradfitz, r
CC=golang-dev
https://golang.org/cl/5645088

Also update build to be able to run mkbuiltin again.
The export form has changed a little, so builtin.c has
more diffs than unsafe.go.

In CL 5650069, I just edited the documentation, a rarely
successful method of change.

R=ken2
CC=golang-dev
https://golang.org/cl/5662043

Fixes #2998.

R=rsc
CC=golang-dev
https://golang.org/cl/5650078

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5654077