| 1 | package workspacelease |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "fmt" |
| 7 | "os" |
| 8 | "path/filepath" |
| 9 | "runtime" |
| 10 | "sync/atomic" |
| 11 | "testing" |
| 12 | "time" |
| 13 | |
| 14 | "reasonix/internal/filelock" |
| 15 | ) |
| 16 | |
| 17 | func TestReversePathBatchesSerializeWithoutDeadlock(t *testing.T) { |
| 18 | root, locks := t.TempDir(), t.TempDir() |
| 19 | first, _ := New(root, locks, nil) |
| 20 | second, _ := New(root, locks, nil) |
| 21 | a := filepath.Join(root, "a.go") |
| 22 | b := filepath.Join(root, "b.go") |
| 23 | start := make(chan struct{}) |
| 24 | type result struct { |
| 25 | release func() |
| 26 | err error |
| 27 | } |
| 28 | results := make(chan result, 2) |
| 29 | ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second) |
| 30 | defer cancel() |
| 31 | for owner, paths := range map[*Owner][]string{first: {a, b}, second: {b, a}} { |
| 32 | go func() { |
| 33 | <-start |
| 34 | release, err := owner.HoldWriteForPaths(ctx, paths) |
| 35 | results <- result{release: release, err: err} |
| 36 | }() |
| 37 | } |
| 38 | close(start) |
| 39 | |
| 40 | one := <-results |
| 41 | if one.err != nil { |
| 42 | t.Fatalf("first batch acquire: %v", one.err) |
| 43 | } |
| 44 | one.release() |
| 45 | two := <-results |
| 46 | if two.err != nil { |
| 47 | t.Fatalf("reverse batch acquire: %v", two.err) |
| 48 | } |
| 49 | two.release() |
| 50 | } |
| 51 | |
| 52 | func TestExclusiveUpgradeKeepsActiveFileProtected(t *testing.T) { |
| 53 | root, locks := t.TempDir(), t.TempDir() |
| 54 | owner, _ := New(root, locks, nil) |
| 55 | contender, _ := New(root, locks, nil) |
| 56 | path := filepath.Join(root, "protected.go") |
| 57 | releasePath, err := owner.HoldWriteForPath(context.Background(), path) |
| 58 | if err != nil { |
| 59 | t.Fatal(err) |
| 60 | } |
| 61 | |
| 62 | upgrade := make(chan error, 1) |
| 63 | go func() { |
| 64 | release, err := owner.HoldWrite(context.Background()) |
| 65 | if err == nil { |
| 66 | release() |
| 67 | } |
| 68 | upgrade <- err |
| 69 | }() |
| 70 | waitForOwnerAcquisition(t, owner) |
| 71 | |
| 72 | ctx, cancel := context.WithTimeout(context.Background(), 80*time.Millisecond) |
| 73 | _, err = contender.HoldWriteForPath(ctx, path) |
| 74 | cancel() |
| 75 | if !errors.Is(err, context.DeadlineExceeded) { |
| 76 | t.Fatalf("active file lost protection during upgrade: %v", err) |
| 77 | } |
| 78 | releasePath() |
| 79 | select { |
| 80 | case err := <-upgrade: |
| 81 | if err != nil { |
| 82 | t.Fatal(err) |
| 83 | } |
| 84 | case <-time.After(2 * time.Second): |
| 85 | t.Fatal("exclusive upgrade did not continue after the file hold released") |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | func TestUncontendedPathWriteDoesNotNotifyWait(t *testing.T) { |
| 90 | var notices atomic.Int32 |
| 91 | owner, err := New(t.TempDir(), t.TempDir(), func() { notices.Add(1) }) |
| 92 | if err != nil { |
| 93 | t.Fatal(err) |
| 94 | } |
| 95 | release, err := owner.HoldWriteForPath(context.Background(), filepath.Join(owner.canonical, "a.go")) |
| 96 | if err != nil { |
| 97 | t.Fatal(err) |
| 98 | } |
| 99 | release() |
| 100 | if got := notices.Load(); got != 0 { |
| 101 | t.Fatalf("uncontended path write emitted %d wait notices", got) |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | func TestWorkspaceWriterGetsPriorityOverNewPathReader(t *testing.T) { |
| 106 | root, locks := t.TempDir(), t.TempDir() |
| 107 | reader, _ := New(root, locks, nil) |
| 108 | writerWaiting := make(chan struct{}, 1) |
| 109 | writer, _ := New(root, locks, func() { writerWaiting <- struct{}{} }) |
| 110 | lateReader, _ := New(root, locks, nil) |
| 111 | releaseReader, err := reader.HoldWriteForPath(context.Background(), filepath.Join(root, "a.go")) |
| 112 | if err != nil { |
| 113 | t.Fatal(err) |
| 114 | } |
| 115 | type result struct { |
| 116 | release func() |
| 117 | err error |
| 118 | } |
| 119 | writerResult := make(chan result, 1) |
| 120 | go func() { |
| 121 | release, acquireErr := writer.HoldWrite(context.Background()) |
| 122 | writerResult <- result{release: release, err: acquireErr} |
| 123 | }() |
| 124 | select { |
| 125 | case <-writerWaiting: |
| 126 | case <-time.After(2 * time.Second): |
| 127 | t.Fatal("workspace writer did not report contention") |
| 128 | } |
| 129 | lateResult := make(chan result, 1) |
| 130 | go func() { |
| 131 | release, acquireErr := lateReader.HoldWriteForPath(context.Background(), filepath.Join(root, "b.go")) |
| 132 | lateResult <- result{release: release, err: acquireErr} |
| 133 | }() |
| 134 | releaseReader() |
| 135 | acquiredWriter := <-writerResult |
| 136 | if acquiredWriter.err != nil { |
| 137 | t.Fatal(acquiredWriter.err) |
| 138 | } |
| 139 | select { |
| 140 | case late := <-lateResult: |
| 141 | if late.release != nil { |
| 142 | late.release() |
| 143 | } |
| 144 | t.Fatal("new path reader bypassed the waiting workspace writer") |
| 145 | default: |
| 146 | } |
| 147 | acquiredWriter.release() |
| 148 | late := <-lateResult |
| 149 | if late.err != nil { |
| 150 | t.Fatal(late.err) |
| 151 | } |
| 152 | late.release() |
| 153 | } |
| 154 | |
| 155 | func TestSameOwnerReusesSharedDomainsWithoutLettingOtherReadersBypassWriter(t *testing.T) { |
| 156 | root, locks := t.TempDir(), t.TempDir() |
| 157 | owner, _ := New(root, locks, nil) |
| 158 | firstPath, secondPath := increasingPathSlots(t, owner) |
| 159 | releaseFirst, err := owner.HoldWriteForPath(context.Background(), firstPath) |
| 160 | if err != nil { |
| 161 | t.Fatal(err) |
| 162 | } |
| 163 | |
| 164 | writerWaiting := make(chan struct{}, 1) |
| 165 | writer, _ := New(root, locks, func() { writerWaiting <- struct{}{} }) |
| 166 | writerResult := make(chan holdResult, 1) |
| 167 | go func() { |
| 168 | release, acquireErr := writer.HoldWrite(context.Background()) |
| 169 | writerResult <- holdResult{release: release, err: acquireErr} |
| 170 | }() |
| 171 | select { |
| 172 | case <-writerWaiting: |
| 173 | case <-time.After(2 * time.Second): |
| 174 | t.Fatal("workspace writer did not report waiting") |
| 175 | } |
| 176 | |
| 177 | ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second) |
| 178 | releaseSecond, err := owner.HoldWriteForPath(ctx, secondPath) |
| 179 | cancel() |
| 180 | if err != nil { |
| 181 | releaseFirst() |
| 182 | t.Fatalf("same owner deadlocked behind a writer waiting on its first path hold: %v", err) |
| 183 | } |
| 184 | |
| 185 | lateWaiting := make(chan struct{}, 1) |
| 186 | lateReader, _ := New(root, locks, func() { lateWaiting <- struct{}{} }) |
| 187 | lateResult := make(chan holdResult, 1) |
| 188 | go func() { |
| 189 | release, acquireErr := lateReader.HoldWriteForPath(context.Background(), secondPath) |
| 190 | lateResult <- holdResult{release: release, err: acquireErr} |
| 191 | }() |
| 192 | select { |
| 193 | case <-lateWaiting: |
| 194 | case <-time.After(2 * time.Second): |
| 195 | t.Fatal("different owner did not queue behind the waiting workspace writer") |
| 196 | } |
| 197 | |
| 198 | releaseSecond() |
| 199 | releaseFirst() |
| 200 | acquiredWriter := awaitHold(t, writerResult) |
| 201 | select { |
| 202 | case late := <-lateResult: |
| 203 | if late.release != nil { |
| 204 | late.release() |
| 205 | } |
| 206 | t.Fatalf("different owner bypassed the waiting workspace writer: %v", late.err) |
| 207 | default: |
| 208 | } |
| 209 | acquiredWriter.release() |
| 210 | acquiredLate := awaitHold(t, lateResult) |
| 211 | acquiredLate.release() |
| 212 | } |
| 213 | |
| 214 | func increasingPathSlots(t *testing.T, owner *Owner) (string, string) { |
| 215 | t.Helper() |
| 216 | first := filepath.Join(owner.canonical, "slot-0.go") |
| 217 | firstSlot := canonicalPathSlot(t, owner, first) |
| 218 | for i := 1; i < pathLockStripes*2; i++ { |
| 219 | candidate := filepath.Join(owner.canonical, fmt.Sprintf("slot-%d.go", i)) |
| 220 | candidateSlot := canonicalPathSlot(t, owner, candidate) |
| 221 | if candidateSlot > firstSlot { |
| 222 | return first, candidate |
| 223 | } |
| 224 | if candidateSlot < firstSlot { |
| 225 | return candidate, first |
| 226 | } |
| 227 | } |
| 228 | t.Fatal("could not find two distinct path lock slots") |
| 229 | return "", "" |
| 230 | } |
| 231 | |
| 232 | func canonicalPathSlot(t *testing.T, owner *Owner, path string) string { |
| 233 | t.Helper() |
| 234 | specs, err := owner.pathSpecs([]string{path}) |
| 235 | if err != nil || len(specs) != 1 { |
| 236 | t.Fatalf("resolve path slot for %q: specs=%v err=%v", path, specs, err) |
| 237 | } |
| 238 | return specs[0].slot |
| 239 | } |
| 240 | |
| 241 | func TestPathLockFilesUseBoundedStripes(t *testing.T) { |
| 242 | owner, err := New(t.TempDir(), t.TempDir(), nil) |
| 243 | if err != nil { |
| 244 | t.Fatal(err) |
| 245 | } |
| 246 | seen := map[string]bool{} |
| 247 | for i := range pathLockStripes * 3 { |
| 248 | seen[owner.pathLockPath(fmt.Sprintf("file-%d", i))] = true |
| 249 | } |
| 250 | if len(seen) > pathLockStripes { |
| 251 | t.Fatalf("path lock files = %d, want at most %d", len(seen), pathLockStripes) |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | func TestHierarchyLockFilesUseBoundedStripes(t *testing.T) { |
| 256 | owner, err := New(t.TempDir(), t.TempDir(), nil) |
| 257 | if err != nil { |
| 258 | t.Fatal(err) |
| 259 | } |
| 260 | seen := map[string]bool{} |
| 261 | for i := range treeLockStripes * 3 { |
| 262 | seen[owner.treeLockPath(fmt.Sprintf("directory-%d", i))] = true |
| 263 | } |
| 264 | if len(seen) > treeLockStripes { |
| 265 | t.Fatalf("hierarchy lock files = %d, want at most %d", len(seen), treeLockStripes) |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | func TestParentPathAndNestedWorkspaceWriterSerializeBothDirections(t *testing.T) { |
| 270 | parent, locks := t.TempDir(), t.TempDir() |
| 271 | nested := filepath.Join(parent, "nested") |
| 272 | if err := os.MkdirAll(filepath.Join(nested, ".git"), 0o700); err != nil { |
| 273 | t.Fatal(err) |
| 274 | } |
| 275 | path := filepath.Join(nested, "shared.go") |
| 276 | |
| 277 | t.Run("parent path blocks nested workspace", func(t *testing.T) { |
| 278 | parentOwner, err := New(parent, locks, nil) |
| 279 | if err != nil { |
| 280 | t.Fatal(err) |
| 281 | } |
| 282 | waiting := make(chan struct{}, 1) |
| 283 | nestedOwner, err := New(nested, locks, func() { waiting <- struct{}{} }) |
| 284 | if err != nil { |
| 285 | t.Fatal(err) |
| 286 | } |
| 287 | releasePath, err := parentOwner.HoldWriteForPath(context.Background(), path) |
| 288 | if err != nil { |
| 289 | t.Fatal(err) |
| 290 | } |
| 291 | result := make(chan holdResult, 1) |
| 292 | go func() { |
| 293 | release, acquireErr := nestedOwner.HoldWrite(context.Background()) |
| 294 | result <- holdResult{release: release, err: acquireErr} |
| 295 | }() |
| 296 | assertHoldWaiting(t, waiting, result) |
| 297 | releasePath() |
| 298 | acquired := awaitHold(t, result) |
| 299 | acquired.release() |
| 300 | }) |
| 301 | |
| 302 | t.Run("nested workspace blocks parent path", func(t *testing.T) { |
| 303 | nestedOwner, err := New(nested, locks, nil) |
| 304 | if err != nil { |
| 305 | t.Fatal(err) |
| 306 | } |
| 307 | waiting := make(chan struct{}, 1) |
| 308 | parentOwner, err := New(parent, locks, func() { waiting <- struct{}{} }) |
| 309 | if err != nil { |
| 310 | t.Fatal(err) |
| 311 | } |
| 312 | releaseWorkspace, err := nestedOwner.HoldWrite(context.Background()) |
| 313 | if err != nil { |
| 314 | t.Fatal(err) |
| 315 | } |
| 316 | result := make(chan holdResult, 1) |
| 317 | go func() { |
| 318 | release, acquireErr := parentOwner.HoldWriteForPath(context.Background(), path) |
| 319 | result <- holdResult{release: release, err: acquireErr} |
| 320 | }() |
| 321 | assertHoldWaiting(t, waiting, result) |
| 322 | releaseWorkspace() |
| 323 | acquired := awaitHold(t, result) |
| 324 | acquired.release() |
| 325 | }) |
| 326 | } |
| 327 | |
| 328 | func TestHierarchyLocksDoNotSerializeUnrelatedWorkspaces(t *testing.T) { |
| 329 | locks := t.TempDir() |
| 330 | base := t.TempDir() |
| 331 | firstRoot := filepath.Join(base, "workspace-a") |
| 332 | if err := os.Mkdir(firstRoot, 0o700); err != nil { |
| 333 | t.Fatal(err) |
| 334 | } |
| 335 | first, err := New(firstRoot, locks, nil) |
| 336 | if err != nil { |
| 337 | t.Fatal(err) |
| 338 | } |
| 339 | secondRoot, secondPath := unrelatedTreePath(t, first, base) |
| 340 | second, err := New(secondRoot, locks, nil) |
| 341 | if err != nil { |
| 342 | t.Fatal(err) |
| 343 | } |
| 344 | ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second) |
| 345 | defer cancel() |
| 346 | releaseWorkspace, err := first.HoldWrite(ctx) |
| 347 | if err != nil { |
| 348 | t.Fatal(err) |
| 349 | } |
| 350 | defer releaseWorkspace() |
| 351 | releasePath, err := second.HoldWriteForPath(ctx, secondPath) |
| 352 | if err != nil { |
| 353 | t.Fatalf("unrelated path write was serialized: %v", err) |
| 354 | } |
| 355 | releasePath() |
| 356 | } |
| 357 | |
| 358 | func TestHierarchyProtocolIntersectsOldExactWorkspaceLocks(t *testing.T) { |
| 359 | parent, locks := t.TempDir(), t.TempDir() |
| 360 | nested := filepath.Join(parent, "nested") |
| 361 | if err := os.MkdirAll(filepath.Join(nested, ".git"), 0o700); err != nil { |
| 362 | t.Fatal(err) |
| 363 | } |
| 364 | path := filepath.Join(nested, "shared.go") |
| 365 | parentOwner, _ := New(parent, locks, nil) |
| 366 | nestedOwner, _ := New(nested, locks, nil) |
| 367 | |
| 368 | t.Run("old parent blocks new nested workspace", func(t *testing.T) { |
| 369 | releaseOld, err := filelock.TryAcquire(parentOwner.lockPath) |
| 370 | if err != nil { |
| 371 | t.Fatal(err) |
| 372 | } |
| 373 | waiting := make(chan struct{}, 1) |
| 374 | contender, _ := New(nested, locks, func() { waiting <- struct{}{} }) |
| 375 | result := make(chan holdResult, 1) |
| 376 | go func() { |
| 377 | release, acquireErr := contender.HoldWrite(context.Background()) |
| 378 | result <- holdResult{release: release, err: acquireErr} |
| 379 | }() |
| 380 | assertHoldWaiting(t, waiting, result) |
| 381 | releaseOld() |
| 382 | acquired := awaitHold(t, result) |
| 383 | acquired.release() |
| 384 | }) |
| 385 | |
| 386 | t.Run("old nested git root blocks new parent path", func(t *testing.T) { |
| 387 | releaseOld, err := filelock.TryAcquire(nestedOwner.lockPath) |
| 388 | if err != nil { |
| 389 | t.Fatal(err) |
| 390 | } |
| 391 | waiting := make(chan struct{}, 1) |
| 392 | contender, _ := New(parent, locks, func() { waiting <- struct{}{} }) |
| 393 | result := make(chan holdResult, 1) |
| 394 | go func() { |
| 395 | release, acquireErr := contender.HoldWriteForPath(context.Background(), path) |
| 396 | result <- holdResult{release: release, err: acquireErr} |
| 397 | }() |
| 398 | assertHoldWaiting(t, waiting, result) |
| 399 | releaseOld() |
| 400 | acquired := awaitHold(t, result) |
| 401 | acquired.release() |
| 402 | }) |
| 403 | } |
| 404 | |
| 405 | func TestLeaseStatesOverlapUsesKeysAcrossWorkspaceRoots(t *testing.T) { |
| 406 | parent := t.TempDir() |
| 407 | nested := filepath.Join(parent, "nested") |
| 408 | inside := filepath.Join(nested, "inside.go") |
| 409 | outside := filepath.Join(parent, "outside.go") |
| 410 | waitingFile := State{Scope: "file", WaitingKeys: []string{inside}} |
| 411 | holderFile := State{HeldScope: "file", HeldKeys: []string{inside}} |
| 412 | if !LeaseStatesOverlap(parent, waitingFile, nested, holderFile) { |
| 413 | t.Fatal("identical file keys must overlap across canonical roots") |
| 414 | } |
| 415 | if LeaseStatesOverlap(nested, State{Scope: "workspace", WaitingKeys: []string{nested}}, parent, State{ |
| 416 | HeldScope: "file", HeldKeys: []string{outside}, |
| 417 | }) { |
| 418 | t.Fatal("nested whole workspace must not match a parent path outside it") |
| 419 | } |
| 420 | if !LeaseStatesOverlap(nested, State{Scope: "workspace", WaitingKeys: []string{nested}}, parent, holderFile) { |
| 421 | t.Fatal("nested whole workspace must match a parent path inside it") |
| 422 | } |
| 423 | if !LeaseStatesOverlap(parent, waitingFile, nested, State{ |
| 424 | HeldScope: "workspace", HeldKeys: []string{nested}, |
| 425 | }) { |
| 426 | t.Fatal("nested whole holder must match a parent path inside it") |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | type holdResult struct { |
| 431 | release func() |
| 432 | err error |
| 433 | } |
| 434 | |
| 435 | func assertHoldWaiting(t *testing.T, waiting <-chan struct{}, result <-chan holdResult) { |
| 436 | t.Helper() |
| 437 | select { |
| 438 | case <-waiting: |
| 439 | case acquired := <-result: |
| 440 | if acquired.release != nil { |
| 441 | acquired.release() |
| 442 | } |
| 443 | t.Fatalf("conflicting hold acquired before release: %v", acquired.err) |
| 444 | case <-time.After(2 * time.Second): |
| 445 | t.Fatal("conflicting hold did not report waiting") |
| 446 | } |
| 447 | select { |
| 448 | case acquired := <-result: |
| 449 | if acquired.release != nil { |
| 450 | acquired.release() |
| 451 | } |
| 452 | t.Fatalf("conflicting hold acquired while blocker remained: %v", acquired.err) |
| 453 | default: |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | func awaitHold(t *testing.T, result <-chan holdResult) holdResult { |
| 458 | t.Helper() |
| 459 | select { |
| 460 | case acquired := <-result: |
| 461 | if acquired.err != nil { |
| 462 | t.Fatal(acquired.err) |
| 463 | } |
| 464 | return acquired |
| 465 | case <-time.After(2 * time.Second): |
| 466 | t.Fatal("hold did not acquire after blocker released") |
| 467 | return holdResult{} |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | func TestNestedWorkspaceRootsSharePathStripes(t *testing.T) { |
| 472 | root, locks := t.TempDir(), t.TempDir() |
| 473 | child := filepath.Join(root, "child") |
| 474 | if err := os.Mkdir(child, 0o700); err != nil { |
| 475 | t.Fatal(err) |
| 476 | } |
| 477 | parentOwner, _ := New(root, locks, nil) |
| 478 | childOwner, _ := New(child, locks, nil) |
| 479 | path := filepath.Join(child, "shared.go") |
| 480 | release, err := parentOwner.HoldWriteForPath(context.Background(), path) |
| 481 | if err != nil { |
| 482 | t.Fatal(err) |
| 483 | } |
| 484 | defer release() |
| 485 | ctx, cancel := context.WithTimeout(context.Background(), 80*time.Millisecond) |
| 486 | defer cancel() |
| 487 | if _, err := childOwner.HoldWriteForPath(ctx, path); !errors.Is(err, context.DeadlineExceeded) { |
| 488 | t.Fatalf("nested workspace bypassed the same-file stripe: %v", err) |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | func TestRetainedPathHoldCanBeReused(t *testing.T) { |
| 493 | owner, err := New(t.TempDir(), t.TempDir(), nil) |
| 494 | if err != nil { |
| 495 | t.Fatal(err) |
| 496 | } |
| 497 | path := filepath.Join(owner.canonical, "retained.go") |
| 498 | release, err := owner.HoldWriteForPath(context.Background(), path) |
| 499 | if err != nil { |
| 500 | t.Fatal(err) |
| 501 | } |
| 502 | done := make(chan struct{}) |
| 503 | owner.RetainUntil(done) |
| 504 | release() |
| 505 | reused, err := owner.HoldWriteForPath(context.Background(), path) |
| 506 | if err != nil { |
| 507 | t.Fatal(err) |
| 508 | } |
| 509 | reused() |
| 510 | close(done) |
| 511 | } |
| 512 | |
| 513 | func TestDarwinCaseAliasesShareFileKey(t *testing.T) { |
| 514 | if runtime.GOOS != "darwin" { |
| 515 | t.Skip("macOS case-insensitive alias regression") |
| 516 | } |
| 517 | root := t.TempDir() |
| 518 | actual := filepath.Join(root, "CaseAlias.go") |
| 519 | if err := os.WriteFile(actual, []byte("package alias"), 0o600); err != nil { |
| 520 | t.Fatal(err) |
| 521 | } |
| 522 | alias := filepath.Join(root, "casealias.go") |
| 523 | actualKey, _, err := canonicalFileKey(actual) |
| 524 | if err != nil { |
| 525 | t.Fatal(err) |
| 526 | } |
| 527 | aliasKey, _, err := canonicalFileKey(alias) |
| 528 | if err != nil { |
| 529 | t.Fatal(err) |
| 530 | } |
| 531 | if actualKey != aliasKey { |
| 532 | t.Fatalf("case aliases produced different keys: %q != %q", actualKey, aliasKey) |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | func waitForOwnerAcquisition(t *testing.T, owner *Owner) { |
| 537 | t.Helper() |
| 538 | deadline := time.After(2 * time.Second) |
| 539 | for { |
| 540 | owner.mu.Lock() |
| 541 | acquiring := owner.lease.acquiring |
| 542 | changed := owner.lease.changed |
| 543 | owner.mu.Unlock() |
| 544 | if acquiring { |
| 545 | return |
| 546 | } |
| 547 | select { |
| 548 | case <-changed: |
| 549 | case <-deadline: |
| 550 | t.Fatal("owner did not begin acquisition") |
| 551 | } |
| 552 | } |
| 553 | } |
| 554 |