tests: add TestConcurrentReadWrite

Another attempt to find out what is going on behind
https://github.com/rfjakob/gocryptfs/issues/363
This commit is contained in:
Jakob Unterwurzacher 2019-03-05 22:21:10 +01:00
parent bde6387e2d
commit d22ccf68b2
1 changed files with 63 additions and 0 deletions

View File

@ -15,7 +15,9 @@ import (
"bytes"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"os/exec"
"runtime"
@ -186,6 +188,67 @@ func TestWrite10Tight(t *testing.T) {
}
}
// https://github.com/rfjakob/gocryptfs/issues/363
//
// Note: this test calls log.Fatal() instead of t.Fatal() because apperently,
// calling t.Fatal() from a goroutine hangs the test.
func TestConcurrentReadWrite(t *testing.T) {
var wg sync.WaitGroup
fn := test_helpers.DefaultPlainDir + "/TestConcurrentReadWrite"
if f, err := os.Create(fn); err != nil {
t.Fatal(err)
} else {
f.Close()
}
buf := make([]byte, 100)
content := []byte("1234567890")
threads := 30
loops := 30
for i := 0; i < threads; i++ {
// Reader thread
wg.Add(1)
go func() {
fRd, err := os.Open(fn)
if err != nil {
log.Fatal(err)
}
for j := 0; j < loops; j++ {
n, err := fRd.ReadAt(buf, 0)
if err != nil && err != io.EOF {
log.Fatal(err)
}
if n != 0 && n != 10 {
log.Fatalf("strange read length: %d", n)
}
}
fRd.Close()
wg.Done()
}()
// Writer thread
wg.Add(1)
go func() {
fWr, err := os.OpenFile(fn, os.O_RDWR, 0700)
if err != nil {
log.Fatal(err)
}
for j := 0; j < loops; j++ {
err = fWr.Truncate(0)
if err != nil {
log.Fatal(err)
}
_, err = fWr.WriteAt(content, 0)
if err != nil {
log.Fatal(err)
}
}
fWr.Close()
wg.Done()
}()
}
wg.Wait()
}
// Hint for calculating reference md5sums:
// dd if=/dev/zero count=1 bs=XYZ | md5sum
func TestTruncate(t *testing.T) {