/**
* Send the Java thread that represents this fiber to sleep until it recieves a resume or exit
* message. On entry, assumes that the GIL is not held. On exit, holding the GIL.
*/
public Object waitForResume() {
RubyNode.notDesignedForCompilation();
FiberMessage message = null;
do {
try {
// TODO(cs) what is a suitable timeout?
message = messageQueue.poll(1, TimeUnit.SECONDS);
} catch (InterruptedException e) {
// Poll again
}
} while (message == null);
if (message instanceof FiberExitMessage) {
throw new FiberExitException();
}
final FiberResumeMessage resumeMessage = (FiberResumeMessage) message;
threadManager.enterGlobalLock(resumeMessage.getThread());
fiberManager.setCurrentFiber(this);
lastResumedByFiber = resumeMessage.getSendingFiber();
return resumeMessage.getArg();
}
/**
* Send a message to a fiber by posting into a message queue. Doesn't explicitly notify the Java
* thread (although the queue implementation may) and doesn't wait for the message to be received.
* On entry, assumes the the GIL is held. On exit, not holding the GIL.
*/
public void resume(RubyFiber sendingFiber, Object... args) {
RubyNode.notDesignedForCompilation();
Object arg;
if (args.length == 0) {
arg = getContext().getCoreLibrary().getNilObject();
} else if (args.length == 1) {
arg = args[0];
} else {
arg = RubyArray.fromObjects(getContext().getCoreLibrary().getArrayClass(), args);
}
final RubyThread runningThread = threadManager.leaveGlobalLock();
messageQueue.add(new FiberResumeMessage(runningThread, sendingFiber, arg));
}