From 35f86b8c87e7663f5e391e8aed851eab355b634a Mon Sep 17 00:00:00 2001
From: hau <ngtranhau@gmail.com>
Date: Sat, 29 Aug 2020 13:28:01 +0700
Subject: [PATCH] add go mutext

---
 Development/Go/strings.md |  2 +-
 Development/Go/sync.md    | 43 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 Development/Go/sync.md

diff --git a/Development/Go/strings.md b/Development/Go/strings.md
index 64a3cf6..57af105 100644
--- a/Development/Go/strings.md
+++ b/Development/Go/strings.md
@@ -1,6 +1,6 @@
 # [strings](https://golang.org/pkg/strings/)
 
-Replace list of strings by using Replacer:
+Replace list of strings by using `Replacer`:
 
 ```go
 template := "My city is {city} and my country is {country}"
diff --git a/Development/Go/sync.md b/Development/Go/sync.md
new file mode 100644
index 0000000..381fc09
--- /dev/null
+++ b/Development/Go/sync.md
@@ -0,0 +1,43 @@
+# [sync](https://golang.org/pkg/sync/)
+
+Use `Mutext` to prevent accessing variable from different goroutine at the same time:
+
+```go
+type foo struct {
+    mu sync.Mutext
+
+    bar map[string]string
+}
+
+func (f *foo) doSomething {
+    f.mu.Lock()
+    defer f.mu.Unlock()
+
+    // do the thing
+}
+
+```
+
+Use `RWMutex` if there are many readers, and few writers:
+
+```go
+type foo struct {
+    mu sync.RWMutext
+
+    bar map[string]string
+}
+
+func (f *foo) read {
+    f.mu.RLock()
+    defer f.mu.RUnlock()
+
+    // read
+}
+
+func (f *foo) write {
+    f.mu.Lock()
+    defer f.mu.Unlock()
+
+    // write
+}
+```