[GC] minor fixes

sdlib/d/gc/collector.d

@@ -64,10 +64,10 @@ private:
 		 * We might have allocated, and therefore refilled the bin
 		 * during the collection process. As a result, slots in the
 		 * bins may not be marked at this point.
-		 *
+		 * 
 		 * The straightforward way to handle this is simply to flush
 		 * the bins.
-		 *
+		 * 
 		 * Alternatively, we could make sure the slots are marked.
 		 */
 		threadCache.flush();
@@ -76,7 +76,7 @@ private:
 
 		collect(gcCycle);
 
-		// allow threads to do busyState things.
+		// Probation period is over, threads can enter busy state now.
 		clearWorldProbation();
 	}
 

sdlib/d/gc/tstate.d

@@ -158,7 +158,8 @@ public:
 			return;
 		}
 
-		// In Resumed state, we need to wait until the GC cycle is done before doing anything.
+		// In Probation state, we need to wait until the GC cycle is
+		// done before doing anything.
 		busyWaitMutex.lock();
 		scope(exit) busyWaitMutex.unlock();
 		busyWaitMutex.waitFor(offProbation);
@@ -356,7 +357,7 @@ unittest suspend {
 	assert(s.onSuspendSignal());
 	check(SuspendState.Probation, false, 1);
 
-	// Clear the probation
+	// Clear the probation.
 	s.clearProbationState();
 	check(SuspendState.None, false, 1);
 
@@ -377,7 +378,7 @@ unittest suspend {
 	assert(s.exitBusyState());
 	check(SuspendState.Probation, false, 2);
 
-	// Enter busy state while on probation
+	// Enter busy state while on probation.
 	assert(lockedProbationCount.load() == 0);
 	s.enterBusyState();
 	assert(lockedProbationCount.load() == 1);

test/valid/test0203.d

@@ -51,7 +51,6 @@ void* watchdog(void* ctx) {
 	threadCache.state.state.store(SuspendState.Detached);
 	int i;
 	while (!shouldQuit.load()) {
-		// Watchdog timeout!
 		assert(++i < 15, "Watchdog timeout!");
 		sleep(1);
 	}