509             protected void realCompute() {
 510                 AsyncFib f = new AsyncFib(8);
 511                 assertSame(f, f.fork());
 512                 f.quietlyJoin();
 513                 assertEquals(21, f.number);
 514                 checkCompletedNormally(f);
 515             }};
 516         testInvokeOnPool(mainPool(), a);
 517     }
 518 
 519     /**
 520      * helpQuiesce returns when tasks are complete.
 521      * getQueuedTaskCount returns 0 when quiescent
 522      */
 523     public void testForkHelpQuiesce() {
 524         RecursiveAction a = new CheckedRecursiveAction() {
 525             protected void realCompute() {
 526                 AsyncFib f = new AsyncFib(8);
 527                 assertSame(f, f.fork());
 528                 helpQuiesce();


 529                 assertEquals(21, f.number);
 530                 assertEquals(0, getQueuedTaskCount());
 531                 checkCompletedNormally(f);
 532             }};
 533         testInvokeOnPool(mainPool(), a);
 534     }
 535 
 536     /**
 537      * invoke task throws exception when task completes abnormally
 538      */
 539     public void testAbnormalInvoke() {
 540         RecursiveAction a = new CheckedRecursiveAction() {
 541             protected void realCompute() {
 542                 FailingAsyncFib f = new FailingAsyncFib(8);
 543                 try {
 544                     f.invoke();
 545                     shouldThrow();
 546                 } catch (FJException success) {
 547                     checkCompletedAbnormally(f, success);
 548                 }

 509             protected void realCompute() {
 510                 AsyncFib f = new AsyncFib(8);
 511                 assertSame(f, f.fork());
 512                 f.quietlyJoin();
 513                 assertEquals(21, f.number);
 514                 checkCompletedNormally(f);
 515             }};
 516         testInvokeOnPool(mainPool(), a);
 517     }
 518 
 519     /**
 520      * helpQuiesce returns when tasks are complete.
 521      * getQueuedTaskCount returns 0 when quiescent
 522      */
 523     public void testForkHelpQuiesce() {
 524         RecursiveAction a = new CheckedRecursiveAction() {
 525             protected void realCompute() {
 526                 AsyncFib f = new AsyncFib(8);
 527                 assertSame(f, f.fork());
 528                 helpQuiesce();
 529                 while (!f.isDone()) // wait out race
 530                     ;
 531                 assertEquals(21, f.number);
 532                 assertEquals(0, getQueuedTaskCount());
 533                 checkCompletedNormally(f);
 534             }};
 535         testInvokeOnPool(mainPool(), a);
 536     }
 537 
 538     /**
 539      * invoke task throws exception when task completes abnormally
 540      */
 541     public void testAbnormalInvoke() {
 542         RecursiveAction a = new CheckedRecursiveAction() {
 543             protected void realCompute() {
 544                 FailingAsyncFib f = new FailingAsyncFib(8);
 545                 try {
 546                     f.invoke();
 547                     shouldThrow();
 548                 } catch (FJException success) {
 549                     checkCompletedAbnormally(f, success);
 550                 }