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package leaktest
import (
"fmt"
"sync"
"testing"
"time"
)
type testReporter struct {
failed bool
msg string
}
func (tr *testReporter) Errorf(format string, args ...interface{}) {
tr.failed = true
tr.msg = fmt.Sprintf(format, args)
}
var leakyFuncs = []func(){
// Infinite for loop
func() {
for {
time.Sleep(time.Second)
}
},
// Select on a channel not referenced by other goroutines.
func() {
c := make(chan struct{}, 0)
select {
case <-c:
}
},
// Blocked select on channels not referenced by other goroutines.
func() {
c := make(chan struct{}, 0)
c2 := make(chan struct{}, 0)
select {
case <-c:
case c2 <- struct{}{}:
}
},
// Blocking wait on sync.Mutex that isn't referenced by other goroutines.
func() {
var mu sync.Mutex
mu.Lock()
mu.Lock()
},
// Blocking wait on sync.RWMutex that isn't referenced by other goroutines.
func() {
var mu sync.RWMutex
mu.RLock()
mu.Lock()
},
func() {
var mu sync.Mutex
mu.Lock()
c := sync.NewCond(&mu)
c.Wait()
},
}
func TestCheck(t *testing.T) {
// this works because the running goroutine is left running at the
// start of the next test case - so the previous leaks don't affect the
// check for the next one
for i, fn := range leakyFuncs {
checker := &testReporter{}
snapshot := Check(checker)
go fn()
snapshot()
if !checker.failed {
t.Errorf("didn't catch sleeping goroutine, test #%d", i)
}
}
}
func TestEmptyLeak(t *testing.T) {
defer Check(t)()
time.Sleep(time.Second)
}
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