updates on community convention around mutex naming and position plus…

… clarification of release in travis

.travis.yml

@@ -26,7 +26,7 @@ jobs:
       script:
         - go get -u github.com/client9/misspell/cmd/misspell
         - misspell -error .
-    - stage: epub
+    - stage: releases
       script:
         - docker pull jagregory/pandoc
         - "./build.epub.sh"

build.epub.sh

@@ -2,7 +2,32 @@
 
 set -e
 
-docker run -v `pwd`:/source jagregory/pandoc -o learn-go-with-tests.epub -o learn-go-with-tests.pdf --latex-engine=xelatex --toc --toc-depth=1 title.txt \
+docker run -v `pwd`:/source jagregory/pandoc -o learn-go-with-tests.pdf --latex-engine=xelatex --toc --toc-depth=1 title.txt \
+    gb-readme.md \
+    hello-world.md \
+    integers.md \
+    arrays-and-slices.md \
+    structs-methods-and-interfaces.md \
+    pointers-and-errors.md \
+    maps.md \
+    dependency-injection.md \
+    mocking.md \
+    concurrency.md \
+    select.md \
+    reflection.md \
+    sync.md \
+    app-intro.md \
+    http-server.md \
+    json.md \
+    io.md \
+    command-line.md \
+    time.md \
+    websockets.md \
+    os-exec.md \
+    error-types.md \
+    why.md
+
+docker run -v `pwd`:/source jagregory/pandoc -o learn-go-with-tests.epub --latex-engine=xelatex --toc --toc-depth=1 title.txt \
     gb-readme.md \
     hello-world.md \
     integers.md \

sync.md

@@ -166,13 +166,13 @@ A simple solution is to add a lock to our `Counter`, a [`Mutex`](https://golang.
 
 ```go
 type Counter struct {
+	mu sync.Mutex
 	value int
-	lock sync.Mutex
 }
 
 func (c *Counter) Inc() {
-	c.lock.Lock()
-	defer c.lock.Unlock()
+	c.mu.Lock()
+	defer c.mu.Unlock()
 	c.value++
 }
 ```
@@ -187,8 +187,8 @@ You may see examples like this
 
 ```go
 type Counter struct {
-	value int
 	sync.Mutex
+	value int
 }
 ```
 

sync/v2/sync.go

@@ -4,8 +4,8 @@ import "sync"
 
 // Counter will increment a number
 type Counter struct {
+	mu    sync.Mutex
 	value int
-	lock  sync.Mutex
 }
 
 // NewCounter returns a new Counter
@@ -15,8 +15,8 @@ func NewCounter() *Counter {
 
 // Inc the count
 func (c *Counter) Inc() {
-	c.lock.Lock()
-	defer c.lock.Unlock()
+	c.mu.Lock()
+	defer c.mu.Unlock()
 	c.value++
 }