From b4815192a6cb05e79fe70487c1f303b1b6f92026 Mon Sep 17 00:00:00 2001
From: Jaden Weiss <jaden@jadendw.dev>
Date: Fri, 27 Mar 2020 19:56:27 -0400
Subject: [PATCH] testdata, sync: add sync.Mutex test to testdata/coroutines.go

---
 testdata/coroutines.go  | 28 +++++++++++++++++++++++++++-
 testdata/coroutines.txt |  6 ++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/testdata/coroutines.go b/testdata/coroutines.go
index 77e14d0e..49fdfc28 100644
--- a/testdata/coroutines.go
+++ b/testdata/coroutines.go
@@ -1,6 +1,9 @@
 package main
 
-import "time"
+import (
+	"sync"
+	"time"
+)
 
 func main() {
 	println("main 1")
@@ -51,6 +54,29 @@ func main() {
 	println("closure go call result:", x)
 
 	time.Sleep(2 * time.Millisecond)
+
+	var m sync.Mutex
+	m.Lock()
+	println("pre-acquired mutex")
+	go acquire(&m)
+	time.Sleep(2 * time.Millisecond)
+	println("releasing mutex")
+	m.Unlock()
+	time.Sleep(2 * time.Millisecond)
+	m.Lock()
+	println("re-acquired mutex")
+	m.Unlock()
+	println("done")
+
+	time.Sleep(2 * time.Millisecond)
+}
+
+func acquire(m *sync.Mutex) {
+	m.Lock()
+	println("acquired mutex from goroutine")
+	time.Sleep(2 * time.Millisecond)
+	m.Unlock()
+	println("released mutex from goroutine")
 }
 
 func sub() {
diff --git a/testdata/coroutines.txt b/testdata/coroutines.txt
index e296f8e0..1e29558a 100644
--- a/testdata/coroutines.txt
+++ b/testdata/coroutines.txt
@@ -14,3 +14,9 @@ async interface method call
 slept inside func pointer 8
 slept inside closure, with value: 20 8
 closure go call result: 1
+pre-acquired mutex
+releasing mutex
+acquired mutex from goroutine
+released mutex from goroutine
+re-acquired mutex
+done