protected IRubyObject resumeOrTransfer(ThreadContext context, IRubyObject arg, boolean transfer) {
CoroutineFiber current = (CoroutineFiber) context.getFiber();
slot = arg;
try {
switch (state) {
case SUSPENDED_YIELD:
if (transfer) {
current.state = CoroutineFiberState.SUSPENDED_TRANSFER;
} else {
current.state = CoroutineFiberState.SUSPENDED_RESUME;
lastFiber = (CoroutineFiber) context.getFiber();
}
state = CoroutineFiberState.RUNNING;
context.getRuntime().getThreadService().setCurrentContext(context);
context.setThread(context.getThread());
Coroutine.yieldTo(coro);
break;
case SUSPENDED_TRANSFER:
if (!transfer) {
throw context.getRuntime().newFiberError("double resume");
}
current.state = CoroutineFiberState.SUSPENDED_TRANSFER;
state = CoroutineFiberState.RUNNING;
context.getRuntime().getThreadService().setCurrentContext(context);
context.setThread(context.getThread());
Coroutine.yieldTo(coro);
break;
case FINISHED:
throw context.getRuntime().newFiberError("dead fiber called");
default:
throw context.getRuntime().newFiberError("fiber in an invalid state: " + state);
}
} catch (OutOfMemoryError oome) {
if (oome.getMessage().equals("unable to create new native thread")) {
throw context.runtime.newThreadError("too many threads, can't create a new Fiber");
}
throw oome;
}
// back from fiber, poll events and proceed out of resume
context.pollThreadEvents();
return slot;
}
public IRubyObject yield(ThreadContext context, IRubyObject arg) {
assert !root;
if (lastFiber.state != CoroutineFiberState.SUSPENDED_RESUME) {
if (lastFiber.state == CoroutineFiberState.SUSPENDED_TRANSFER) {
throw context.getRuntime().newFiberError("a Fiber that was transferred to cannot yield");
}
throw context
.getRuntime()
.newFiberError("invalid state of last Fiber at yield: " + lastFiber.state);
}
slot = arg;
state = CoroutineFiberState.SUSPENDED_YIELD;
lastFiber.state = CoroutineFiberState.RUNNING;
context.getRuntime().getThreadService().setCurrentContext(lastFiber.context);
Object o = lastFiber.context;
lastFiber.context.setThread(context.getThread());
Coroutine.yieldTo(lastFiber.coro);
// back from fiber, poll events and proceed out of resume
context.pollThreadEvents();
return slot;
}