Added Signbit(), revised Copysign()

R=rsc
CC=golang-dev
https://golang.org/cl/822045

Avoids spurious wakeups during other sleeping by that goroutine.
Fixes #711.

R=r
CC=golang-dev
https://golang.org/cl/902041

Fixes #677.

R=rsc
CC=golang-dev
https://golang.org/cl/834046

R=rsc, adg
CC=golang-dev
https://golang.org/cl/881047

R=iant
CC=golang-dev
https://golang.org/cl/874043

R=rsc, iant
CC=golang-dev
https://golang.org/cl/824045

TBR=kaib
CC=golang-dev
https://golang.org/cl/897041

TBR=kaib
CC=golang-dev
https://golang.org/cl/883046

channel recv data.

R=rsc
CC=golang-dev
https://golang.org/cl/896041

data just read from the channel.
this will make it easier to
recognize when to garbage
collect and finalize.

R=rsc
CC=golang-dev
https://golang.org/cl/882043

The cycle is *netFD -> cw chanl *netFD in struct ->
same *netFD in channel read buffer.

Because channels are finalized, the cycle makes them
uncollectable.  A better fix is to make channels not
finalized anymore, and that will happen, but this is
an easy, reasonable workaround until then.

Another good fix would be to zero the channel receive
buffer entry after the receive.  That too will happen.

R=r
CC=golang-dev
https://golang.org/cl/875043

R=rsc
CC=golang-dev
https://golang.org/cl/864044

1. Fix bug in GOMAXPROCS when trying to cut number of procs
Race could happen on any system but was
manifesting only on Xen hosted Linux.

2. Fix recover on ARM, where FP != caller SP.

R=r
CC=golang-dev
https://golang.org/cl/880043

Instead of calling the package scope Lex function,
Parse now takes an argument which is used to
do the lexing.
I reverted to having the generated switch
code inside Parse rather than a separate function because
the function needs 7 arguments or a context structure,
which seems unnecessary.
I used yyrun(), not the original $A so that
it's possible to run the backquoted code through gofmt.

R=rsc, ken2, ken3
CC=golang-dev
https://golang.org/cl/879041

to float instructions work correctly.

R=rsc
CC=golang-dev
https://golang.org/cl/870044

also: add /dev/null to the ls args to repair handling of empty dependency lists.

R=rsc
CC=golang-dev
https://golang.org/cl/883045

This is a documentation enhancement only, without any code
change.

The rationale for documenting this precisely is that Unix
programmers who "know" that errno's value is undefined after
a successful system call may be surprised otherwise and
search to be sure that a zero errno may be relied upon after
successful calls.

R=r, rsc1, rsc
CC=golang-dev
https://golang.org/cl/812044

R=rsc, r
CC=golang-dev
https://golang.org/cl/810043

R=rsc
CC=golang-dev
https://golang.org/cl/812041

R=gri
CC=golang-dev
https://golang.org/cl/867044

log: add test of Caller

New regexp in log test is picky and will require some
maintenance, but it catches off-by-one mistakes too.

Fixes #710.

R=gri
CC=esko.luontola, golang-dev
https://golang.org/cl/887043

R=adg
CC=golang-dev
https://golang.org/cl/813043

R=rsc
CC=golang-dev
https://golang.org/cl/881042

Complex math function package. Still needs more special case checking.

R=rsc
CC=golang-dev
https://golang.org/cl/874041

R=iant
CC=golang-dev
https://golang.org/cl/862042

R=adg
CC=golang-dev
https://golang.org/cl/893041

R=ken2
CC=golang-dev
https://golang.org/cl/821048

R=agl1
CC=golang-dev
https://golang.org/cl/851041

  * correct symbol table size
  * do not reorder functions in output
  * traceback
  * signal handling
  * use same code for go + defer
  * handle leaf functions in symbol table

R=kaib, dpx
CC=golang-dev
https://golang.org/cl/884041

Adding this question on Russ' recommendation - not sure if
there is some detail here I'm missing.

The associated discussion was:
http://groups.google.com/group/golang-nuts/t/ec6b27e332ed7f77

R=rsc, r
CC=golang-dev
https://golang.org/cl/887042

R=ken2
CC=golang-dev
https://golang.org/cl/855044

R=rsc, rsc1
CC=golang-dev
https://golang.org/cl/808041

R=rsc
CC=golang-dev
https://golang.org/cl/881044

R=rsc
CC=golang-dev
https://golang.org/cl/844044

R=rsc
CC=golang-dev
https://golang.org/cl/829044

R=rsc
CC=golang-dev
https://golang.org/cl/770041

R=ken2, r
CC=golang-dev
https://golang.org/cl/871042

R=rsc
CC=golang-dev
https://golang.org/cl/836046

R=rsc
CC=golang-dev
https://golang.org/cl/838046

R=rsc, r
CC=golang-dev
https://golang.org/cl/855043