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package filelock
import (
"context"
"errors"
"os"
"path/filepath"
"testing"
)
func TestTryExclusive_SecondDescriptorWouldBlock(t *testing.T) {
dir := t.TempDir()
p := filepath.Join(dir, "lock")
f1, err := os.OpenFile(p, os.O_CREATE|os.O_RDWR, 0o600)
if err != nil {
t.Fatal(err)
}
t.Cleanup(func() { _ = f1.Close() })
f2, err := os.OpenFile(p, os.O_CREATE|os.O_RDWR, 0o600)
if err != nil {
t.Fatal(err)
}
t.Cleanup(func() { _ = f2.Close() })
if err := TryExclusive(f1); err != nil {
t.Fatalf("first TryExclusive: %v", err)
}
err = TryExclusive(f2)
if !errors.Is(err, ErrWouldBlock) {
t.Fatalf("second TryExclusive = %v, want ErrWouldBlock", err)
}
if err := UnlockExclusive(f1); err != nil {
t.Fatal(err)
}
if err := TryExclusive(f2); err != nil {
t.Fatalf("after unlock: %v", err)
}
if err := UnlockExclusive(f2); err != nil {
t.Fatal(err)
}
}
func TestAcquireExclusive_ContextCancelledWhileBlocked(t *testing.T) {
dir := t.TempDir()
p := filepath.Join(dir, "lock")
fHeld, err := os.OpenFile(p, os.O_CREATE|os.O_RDWR, 0o600)
if err != nil {
t.Fatal(err)
}
t.Cleanup(func() { _ = fHeld.Close() })
if err := TryExclusive(fHeld); err != nil {
t.Fatal(err)
}
fWait, err := os.OpenFile(p, os.O_CREATE|os.O_RDWR, 0o600)
if err != nil {
t.Fatal(err)
}
t.Cleanup(func() { _ = fWait.Close() })
ctx, cancel := context.WithCancel(context.Background())
cancel()
_, err = AcquireExclusive(ctx, fWait)
if !errors.Is(err, context.Canceled) {
t.Fatalf("AcquireExclusive = %v, want context.Canceled", err)
}
if err := UnlockExclusive(fHeld); err != nil {
t.Fatal(err)
}
}
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