delta/go-git.git/src/runtime/os_plan9.go, branch dev.inline

net: implement asynchonous cancelable I/O on Plan 9

2016-11-12T05:44:36+00:00

This change is an experimental implementation of asynchronous
cancelable I/O operations on Plan 9, which are required to
implement deadlines.

There are no asynchronous syscalls on Plan 9. I/O operations
are performed with blocking pread and pwrite syscalls.

Implementing deadlines in Go requires a way to interrupt
I/O operations.

It is possible to interrupt reads and writes on a TCP connection
by forcing the closure of the TCP connection. This approach
has been used successfully in CL 31390.

However, we can't implement deadlines with this method, since
we require to be able to reuse the connection after the timeout.

On Plan 9, I/O operations are interrupted when the process
receives a note. We can rely on this behavior to implement
a more generic approach.

When doing an I/O operation (read or write), we start the I/O in
its own process, then wait for the result asynchronously. The
process is able to handle the "hangup" note. When receiving the
"hangup" note, the currently running I/O operation is canceled
and the process returns.

This way, deadlines can be implemented by sending an "hangup"
note to the process running the blocking I/O operation, after
the expiration of a timer.

Fixes #11932.
Fixes #17498.

Change-Id: I414f72c7a9a4f9b8f9c09ed3b6c269f899d9b430
Reviewed-on: https://go-review.googlesource.com/31521
Reviewed-by: Brad Fitzpatrick

runtime, syscall: appease vet

2016-10-25T15:11:54+00:00

No functional changes.

Change-Id: I0842b2560f4296abfc453410fdd79514132cab83
Reviewed-on: https://go-review.googlesource.com/31935
Run-TryBot: Josh Bleecher Snyder 
Reviewed-by: Rob Pike 
TryBot-Result: Gobot Gobot

runtime: minor simplifications to signal code

2016-09-28T13:12:47+00:00

Change setsig, setsigstack, getsig, raise, raiseproc to take uint32 for
signal number parameter, as that is the type mostly used for signal
numbers.  Same for dieFromSignal, sigInstallGoHandler, raisebadsignal.

Remove setsig restart parameter, as it is always either true or
irrelevant.

Don't check the handler in setsigstack, as the only caller does that
anyhow.

Don't bother to convert the handler from sigtramp to sighandler in
getsig, as it will never be called when the handler is sigtramp or
sighandler.

Don't check the return value from rt_sigaction in the GNU/Linux version
of setsigstack; no other setsigstack checks it, and it never fails.

Change-Id: I6bbd677e048a77eddf974dd3d017bc3c560fbd48
Reviewed-on: https://go-review.googlesource.com/29953
Run-TryBot: Ian Lance Taylor 
TryBot-Result: Gobot Gobot 
Reviewed-by: Brad Fitzpatrick

runtime: fetch physical page size from the OS

2016-09-06T21:05:50+00:00

Currently the physical page size assumed by the runtime is hard-coded.
On Linux the runtime at least fetches the OS page size during init and
sanity checks against the hard-coded value, but they may still differ.
On other OSes we wouldn't even notice.

Add support on all OSes to fetch the actual OS physical page size
during runtime init and lift the sanity check of PhysPageSize from the
Linux init code to general malloc init. Currently this is the only use
of the retrieved page size, but we'll add more shortly.

Updates #12480 and #10180.

Change-Id: I065f2834bc97c71d3208edc17fd990ec9058b6da
Reviewed-on: https://go-review.googlesource.com/25050
Run-TryBot: Austin Clements 
TryBot-Result: Gobot Gobot 
Reviewed-by: Rick Hudson

os: rename remaining four os1_.go files to os_.go

2016-05-06T17:47:44+00:00

Change-Id: Ice9c234960adc7857c8370b777a0b18e29d59281
Reviewed-on: https://go-review.googlesource.com/22853
Reviewed-by: Ian Lance Taylor 
Run-TryBot: Ian Lance Taylor 
TryBot-Result: Gobot Gobot

runtime: delete empty files

2016-05-06T17:04:11+00:00

I meant to delete these in CL 22850, actually.

Change-Id: I0c286efd2b9f1caf0221aa88e3bcc03649c89517
Reviewed-on: https://go-review.googlesource.com/22851
Reviewed-by: Ian Lance Taylor 
Run-TryBot: Ian Lance Taylor 
TryBot-Result: Gobot Gobot

runtime: merge the last four os-vs-os1 files together

2016-05-06T16:03:25+00:00

Change-Id: Ib0ba691c4657fe18a4659753e70d97c623cb9c1d
Reviewed-on: https://go-review.googlesource.com/22850
Run-TryBot: Brad Fitzpatrick 
TryBot-Result: Gobot Gobot 
Reviewed-by: Ian Lance Taylor

runtime: signal handling support for plan9_arm

2016-03-07T16:25:17+00:00

Plan 9 trap/signal handling differs on ARM from other architectures
because ARM has a link register.  Also trap message syntax varies
between different architectures (historical accident?).
Revised 7 March to clarify a comment.

Change-Id: Ib6485f82857a2f9a0d6b2c375cf0aaa230b83656
Reviewed-on: https://go-review.googlesource.com/18969
Run-TryBot: Brad Fitzpatrick 
TryBot-Result: Gobot Gobot 
Reviewed-by: Brad Fitzpatrick

all: make copyright headers consistent with one space after period

2016-03-01T23:34:33+00:00

This is a subset of https://golang.org/cl/20022 with only the copyright
header lines, so the next CL will be smaller and more reviewable.

Go policy has been single space after periods in comments for some time.

The copyright header template at:

    https://golang.org/doc/contribute.html#copyright

also uses a single space.

Make them all consistent.

Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0
Reviewed-on: https://go-review.googlesource.com/20111
Run-TryBot: Brad Fitzpatrick 
Reviewed-by: Ian Lance Taylor 
Reviewed-by: Matthew Dempsky 
TryBot-Result: Gobot Gobot

runtime: move m's OS-specific semaphore fields into mOS

2015-11-13T02:58:12+00:00

Allows removing fields that aren't relevant to a particular OS or
changing their types to match the underlying OS system calls they'll
be used for.

Change-Id: I5cea89ee77b4e7b985bff41337e561887c3272ff
Reviewed-on: https://go-review.googlesource.com/16176
Reviewed-by: Ian Lance Taylor 
Run-TryBot: Matthew Dempsky