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Brad Fitzpatrick f28c8fba67 database/sql: associate a mutex with each driver interface 
The database/sql/driver docs make this promise:

   "Conn is a connection to a database. It is not used
   concurrently by multiple goroutines."

That promises exists as part of database/sql's overall
goal of making drivers relatively easy to write.

So far this promise has been kept without the use of locks by
being careful in the database/sql package, but sometimes too
careful. (cf. golang.org/issue/3857)

The CL associates a Mutex with each driver.Conn, and with the
interface value progeny thereof. (e.g. each driver.Tx,
driver.Stmt, driver.Rows, driver.Result, etc) Then whenever
those interface values are used, the Locker is locked.

This CL should be a no-op (aside from some new Lock/Unlock
pairs) and doesn't attempt to fix Issue 3857 or Issue 4459,
but should make it much easier in a subsequent CL.

Update #3857

R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/7803043
2013-03-14 15:01:45 -07:00
api api/next.txt: remove references to go/types, now in separate repo 2013-03-12 14:42:37 -07:00
doc doc: clarify that gccgo is a GCC front-end 2013-03-12 17:12:56 -07:00
include lib9: add mktempdir, removeall, runprog 2013-03-06 15:48:28 -05:00
lib cmd/godoc: fix BUGS heading in text mode 2013-03-13 15:22:59 -04:00
misc misc/pprof: fix address lookup regression on Linux 2013-03-13 09:40:38 -07:00
src database/sql: associate a mutex with each driver interface 2013-03-14 15:01:45 -07:00
test go/test/bench/go1: add regexp test 2013-03-12 16:50:10 -07:00
.hgignore build: update Makefile to track source code dependencies better 2012-03-13 03:31:11 +08:00
.hgtags tag go1.0.3 2012-09-24 13:15:33 -05:00
AUTHORS A+C: Adrian Nos (individual CLA) 2013-03-12 11:45:30 -04:00
CONTRIBUTORS A+C: Adrian Nos (individual CLA) 2013-03-12 11:45:30 -04:00
favicon.ico godoc: update favicon 2012-10-11 17:02:36 +11:00
LICENSE doc: update licensing text one more time 2012-03-27 15:09:13 +11:00
PATENTS LICENSE: separate, change PATENTS text 2010-12-06 16:31:59 -05:00
README build: update, streamline documentation for new $GOBIN 2010-08-24 20:00:50 -04:00
robots.txt godoc: serve robots.txt raw 2011-02-19 05:46:20 +11:00

README 

This is the source code repository for the Go programming language.  

For documentation about how to install and use Go,
visit http://golang.org/ or load doc/install.html in your web browser.

After installing Go, you can view a nicely formatted
doc/install.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install.html.

Unless otherwise noted, the Go source files are distributed
under the BSD-style license found in the LICENSE file.

--

Binary Distribution Notes

If you have just untarred a binary Go distribution, you need to set
the environment variable $GOROOT to the full path of the go
directory (the one containing this README).  You can omit the
variable if you unpack it into /usr/local/go, or if you rebuild
from sources by running all.bash (see doc/install.html).
You should also add the Go binary directory $GOROOT/bin
to your shell's path.

For example, if you extracted the tar file into $HOME/go, you might
put the following in your .profile:

    export GOROOT=$HOME/go
    export PATH=$PATH:$GOROOT/bin

See doc/install.html for more details.