fix

blog/golang/golang-concurrency.md

@@ -127,3 +127,420 @@ step2:  https://www.taobao.com/
 step3:  https://www.taobao.com/
 step4:  87347
 ```
+
+## golang并发编程之channel
+
+Go提供了一种通道机制，用于goroutine之间`共享数据`
+
+通道需要指定`数据类型`
+
+通道分类：
+- 无缓冲通道 同步通讯
+- 缓冲通道   异步通讯
+
+语法
+
+```go
+// 整型无缓冲通道，默认零值
+Unbuffered := make(chan int)
+
+// 整型缓冲通道
+buffered := make(chan int, 10)
+```
+
+通道数据交换
+
+```go
+channel := make(chan string, 5)
+
+// 将值发送到通道
+channel <- "hello"
+
+// 从通道接收值
+data := <- channel
+```
+
+通道的发送和接收特性
+
+- 同一通道，发送操作之间是互斥的，接收操作之间也是互斥的
+- 发送操作和接收操作中对元素值的处理都是不可分割的
+- 发送操作在完全完成之前会被阻塞，接收操作也是如此
+
+示例
+
+```go
+package main
+
+import (
+    "fmt"
+    "math/rand"
+    "time"
+)
+
+// 创建一个int类型的通道
+var value = make(chan int)
+
+func send() {
+
+    // 向通道发送一个随机值
+    rand.Seed(time.Now().UnixNano())
+    v := rand.Intn(10)
+
+    time.Sleep(time.Second * 3)
+    value <- v
+}
+
+func main() {
+    // 关闭通道
+    defer close(value)
+
+    go send()
+
+    fmt.Println("wait...")
+
+    // 从通道接收值
+    v := <-value
+
+    fmt.Printf("v: %v\n", v)
+}
+
+```
+
+## golang并发编程之WaitGroup实现同步
+
+示例1
+
+```go
+package main
+
+import (
+    "fmt"
+)
+
+func showMessage(i int) {
+    fmt.Printf("i: %v\n", i)
+}
+
+func main() {
+    for i := 0; i < 10; i++ {
+        showMessage(i)
+    }
+}
+
+```
+
+输出
+```go
+i: 0
+i: 1
+i: 2
+i: 3
+i: 4
+i: 5
+i: 6
+i: 7
+i: 8
+i: 9
+```
+
+示例 2
+
+```go
+package main
+
+import (
+    "fmt"
+)
+
+func showMessage(i int) {
+    fmt.Printf("i: %v\n", i)
+}
+
+func main() {
+    for i := 0; i < 10; i++ {
+        // 启动协程来执行
+        go showMessage(i)
+    }
+
+    // 主协程执行结束
+    fmt.Println("end")
+}
+
+```
+
+
+输出
+```go
+i: 0
+end
+```
+
+示例 3
+
+```go
+package main
+
+import (
+    "fmt"
+    "sync"
+)
+
+var wp sync.WaitGroup
+
+func showMessage(i int) {
+    defer wp.Done()
+
+    fmt.Printf("i: %v\n", i)
+}
+
+func main() {
+    for i := 0; i < 10; i++ {
+        go showMessage(i)
+        wp.Add(1)
+    }
+
+    wp.Wait()
+
+    fmt.Println("end")
+}
+
+```
+
+输出
+```
+i: 4
+i: 1
+i: 0
+i: 5
+i: 7
+i: 8
+i: 2
+i: 3
+i: 9
+i: 6
+end
+```
+
+## golang并发编程之runtime包
+
+runtime定义了协程管理的包
+
+## Gosched
+
+让出执行权限
+
+示例
+
+```go
+package main
+
+import (
+    "fmt"
+)
+
+func show() {
+    for i := 0; i < 2; i++ {
+        fmt.Printf("show i: %v\n", i)
+    }
+}
+
+func main() {
+    go show()
+
+    for i := 0; i < 2; i++ {
+        fmt.Printf("main i: %v\n", i)
+    }
+
+    fmt.Println("end")
+}
+
+```
+
+输出
+
+```
+main i: 0
+main i: 1
+end
+```
+
+示例 2
+
+```go
+package main
+
+import (
+    "fmt"
+    "runtime"
+)
+
+func show() {
+    for i := 0; i < 2; i++ {
+        fmt.Printf("show i: %v\n", i)
+    }
+}
+
+func main() {
+    go show()
+
+    for i := 0; i < 2; i++ {
+
+        // 让出执行权限，给其他子协程执行
+        runtime.Gosched()
+
+        fmt.Printf("main i: %v\n", i)
+    }
+
+    fmt.Println("end")
+}
+
+```
+
+输出
+```
+show i: 0
+main i: 0
+main i: 1
+end
+```
+
+### Goexit
+
+退出当前协程
+
+示例
+
+```go
+package main
+
+import (
+    "fmt"
+    "runtime"
+    "time"
+)
+
+func show() {
+    for i := 0; i < 10; i++ {
+        fmt.Printf("show i: %v\n", i)
+        if i >= 5 {
+            runtime.Goexit()
+        }
+    }
+}
+
+func main() {
+    go show()
+
+    time.Sleep(time.Second)
+
+    fmt.Println("end")
+}
+
+```
+
+输出
+```
+show i: 0
+show i: 1
+show i: 2
+show i: 3
+show i: 4
+show i: 5
+end
+```
+
+### GOMAXPROCS
+
+设置CPU数量
+
+```go
+package main
+
+import (
+    "fmt"
+    "runtime"
+    "time"
+)
+
+func show(name string) {
+    for i := 0; i < 10; i++ {
+        fmt.Printf("%v i: %v\n", name, i)
+    }
+}
+
+func main() {
+
+    // 查看CPU核数
+    fmt.Printf("runtime.NumCPU(): %v\n", runtime.NumCPU())
+    // runtime.NumCPU(): 8
+
+    // 设置CPU数量
+    runtime.GOMAXPROCS(2)
+
+    go show("A")
+    go show("B")
+
+    time.Sleep(time.Second)
+
+    fmt.Println("end")
+}
+
+```
+
+## golang并发编程之Mutex 互斥锁实现同步
+
+示例
+
+```go
+package main
+
+import (
+    "fmt"
+    "sync"
+    "time"
+)
+
+var value = 100
+var wg sync.WaitGroup
+
+var lock sync.Mutex
+
+func add() {
+    defer wg.Done()
+
+    lock.Lock()
+    time.Sleep(time.Millisecond * 2)
+
+    value += 1
+    fmt.Printf("i++: %v\n", value)
+    lock.Unlock()
+}
+
+func sub() {
+    defer wg.Done()
+
+    lock.Lock()
+
+    time.Sleep(time.Millisecond * 10)
+
+    value -= 1
+    fmt.Printf("i--: %v\n", value)
+
+    lock.Unlock()
+}
+
+func main() {
+    for i := 0; i < 100; i++ {
+        wg.Add(1)
+        go add()
+
+        wg.Add(1)
+        go sub()
+    }
+
+    wg.Wait()
+    fmt.Printf("end: %v\n", value)
+}
+
+```
+

blog/golang/index.md

@@ -52,4 +52,4 @@
 https://www.bilibili.com/video/BV1ME411Y71o?p=27&spm_id_from=pageDriver&vd_source=efbb4dc944fa761b6e016ce2ca5933da
 
 
-https://www.bilibili.com/video/BV1zR4y1t7Wj/?p=68&spm_id_from=pageDriver&vd_source=efbb4dc944fa761b6e016ce2ca5933da
\ No newline at end of file
+https://www.bilibili.com/video/BV1zR4y1t7Wj/?p=72&spm_id_from=pageDriver&vd_source=efbb4dc944fa761b6e016ce2ca5933da
\ No newline at end of file

blog/pay/start.md

@@ -13,6 +13,10 @@
 
 4. 商户证书
     - 微信商户平台：https://pay.weixin.qq.com/
+    - 文档：https://kf.qq.com/faq/161222NneAJf161222U7fARv.html
+    - 下载证书工具：
+        - windows版本 ：https://wx.gtimg.com/mch/files/WXCertUtil.exe
+        - mac版本 ：https://wx.gtimg.com/mch/files/WXCertUtil.dmg
 
 5. 微信平台证书
     - Java命令行下载工具： https://github.com/wechatpay-apiv3/CertificateDownloader