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Update en 01.1.md and 02.7.md

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2016-12-24 03:17:56 +08:00
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@@ -15,8 +15,9 @@ There are many ways to configure the Go development environment on your computer
In case you want to install more than one version of Go on a computer, you should take a look at a tool called [GVM](https://github.com/moovweb/gvm). It is the best tool I've seen so far for accomplishing this task, otherwise you'd have to deal with it yourself.
## Install from source code
Go 1.5 completely remove the C code，Runtime、Compiler、Linker powered by Go,Achieve bootstrapping,You only need the previous version to compile go.
Because some parts of Go are written in Plan 9 C and AT&T assembler, you have to install a C compiler before taking the next step.
But before Go 1.5 some parts of Go are written in Plan 9 C and AT&T assembler, you have to install a C compiler before taking the next step.
On a Mac, if you have installed Xcode, you already have the compiler.
@@ -75,15 +76,15 @@ A 64-bit operating system will show the following:
### Mac
Go to the [download page](https://golang.org/dl/), choose `go1.4.2.darwin-386.pkg` for 32-bit systems and `go1.4.2.darwin-amd64.pkg` for 64-bit systems. Going all the way to the end by clicking "next", `~/go/bin` will be added to your system's $PATH after you finish the installation. Now open the terminal and type `go`. You should see the same output shown in figure 1.1.
Go to the [download page](https://golang.org/dl/), choose `go1.4.2.darwin-386.pkg` for 32-bit systems and `go1.7.4.darwin-amd64.pkg` for 64-bit systems. Going all the way to the end by clicking "next", `~/go/bin` will be added to your system's $PATH after you finish the installation. Now open the terminal and type `go`. You should see the same output shown in figure 1.1.
### Linux
Go to the [download page](https://golang.org/dl/), choose `go1.4.2.linux-386.tar.gz` for 32-bit systems and `go1.4.2.linux-amd64.tar.gz` for 64-bit systems. Suppose you want to install Go in the `$GO_INSTALL_DIR` path. Uncompress the `tar.gz` to your chosen path using the command `tar zxvf go1.4.2.linux-amd64.tar.gz -C $GO_INSTALL_DIR`. Then set your $PATH with the following: `export PATH=$PATH:$GO_INSTALL_DIR/go/bin`. Now just open the terminal and type `go`. You should now see the same output displayed in figure 1.1.
Go to the [download page](https://golang.org/dl/), choose `go1.7.4.linux-386.tar.gz` for 32-bit systems and `go1.7.4.linux-amd64.tar.gz` for 64-bit systems. Suppose you want to install Go in the `$GO_INSTALL_DIR` path. Uncompress the `tar.gz` to your chosen path using the command `tar zxvf go1.7.4.linux-amd64.tar.gz -C $GO_INSTALL_DIR`. Then set your $PATH with the following: `export PATH=$PATH:$GO_INSTALL_DIR/go/bin`. Now just open the terminal and type `go`. You should now see the same output displayed in figure 1.1.
### Windows
Go to the [download page](https://golang.org/dl/), choose `go1.4.2.windows-386.msi` for 32-bit systems and `go1.4.2.windows-amd64.msi` for 64-bit systems. Going all the way to the end by clicking "next", `c:/go/bin` will be added to `path`. Now just open a command line window and type `go`. You should now see the same output displayed in figure 1.1.
Go to the [download page](https://golang.org/dl/), choose `go1.7.4.windows-386.msi` for 32-bit systems and `go1.7.4.windows-amd64.msi` for 64-bit systems. Going all the way to the end by clicking "next", `c:/go/bin` will be added to `path`. Now just open a command line window and type `go`. You should now see the same output displayed in figure 1.1.
## Use third-party tools
@@ -95,8 +96,8 @@ GVM is a Go multi-version control tool developed by a third-party, like rvm for
Then we install Go using the following commands:
gvm install go1.4.2
gvm use go1.4.2
gvm install go1.7.4
gvm use go1.7.4
After the process has finished, you're all set.
@@ -108,10 +109,28 @@ Ubuntu is the most popular desktop release version of Linux. It uses `apt-get` t
sudo apt-get update
sudo apt-get install golang-stable
###wget
```sh
wget https://storage.googleapis.com/golang/go1.7.4.linux-amd64.tar.gz
sudo tar -xzf go1.7.4.linux-amd64.tar.gz -C /usr/local
export PATH=PATH:/usr/local/go/binexportGOROOT=HOME/go
export PATH=PATH:GOROOT/bin
export GOPATH=HOME/gowork
```
### Homebrew
Homebrew is a software management tool commonly used in Mac to manage packages. Just type the following commands to install Go.
1.Install Homebrew
```sh
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
```
2.Install Go
brew update && brew upgrade
brew install go
## Links

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en/02.7.md
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@@ -47,7 +47,9 @@ We see that it's very easy to use concurrency in Go by using the keyword `go`. I
runtime.Gosched() means let the CPU execute other goroutines, and come back at some point.
The scheduler only uses one thread to run all goroutines, which means it only implements concurrency. If you want to use more CPU cores in order to take advantage of parallel processing, you have to call runtime.GOMAXPROCS(n) to set the number of cores you want to use. If `n<1`, it changes nothing. This function may be removed in the future, see more details about parallel processing and concurrency in this [article](http://concur.rspace.googlecode.com/hg/talk/concur.html#landing-slide).
In Go 1.5,the runtime now sets the default number of threads to run simultaneously, defined by GOMAXPROCS, to the number of cores available on the CPU.
Before Go 1.5,The scheduler only uses one thread to run all goroutines, which means it only implements concurrency. If you want to use more CPU cores in order to take advantage of parallel processing, you have to call runtime.GOMAXPROCS(n) to set the number of cores you want to use. If `n<1`, it changes nothing.
## channels