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Add single-frame yield mode

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This commit is contained in:
Tim Mickel 2016-07-01 10:44:43 -04:00
parent 5876681bc7
commit de6ba08866
4 changed files with 39 additions and 11 deletions
src/engine
sequencer.js

15
src/engine/sequencer.js
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@ -36,6 +36,13 @@ Sequencer.prototype.stepThreads = function (threads) {
var inactiveThreads = [];
// If all of the threads are yielding, we should yield.
var numYieldingThreads = 0;
// Clear all yield statuses that were for the previous frame.
for (var t = 0; t < threads.length; t++) {
if (threads[t].status === Thread.STATUS_YIELD_FRAME) {
threads[t].setStatus(Thread.STATUS_RUNNING);
}
}
// While there are still threads to run and we are within WORK_TIME,
// continue executing threads.
while (threads.length > 0 &&
@ -51,8 +58,10 @@ Sequencer.prototype.stepThreads = function (threads) {
if (activeThread.status === Thread.STATUS_RUNNING) {
// Normal-mode thread: step.
this.startThread(activeThread);
} else if (activeThread.status === Thread.STATUS_YIELD) {
} else if (activeThread.status === Thread.STATUS_YIELD ||
activeThread.status === Thread.STATUS_YIELD_FRAME) {
// Yielding thread: do nothing for this step.
numYieldingThreads++;
continue;
}
if (activeThread.stack.length === 0 &&
@ -148,8 +157,6 @@ Sequencer.prototype.proceedThread = function (thread) {
var currentBlockId = thread.peekStack();
// Mark the status as done and proceed to the next block.
this.runtime.glowBlock(currentBlockId, false);
// If the block was yielding, move back to running state.
thread.status = Thread.STATUS_RUNNING;
// Pop from the stack - finished this level of execution.
thread.popStack();
// Push next connected block, if there is one.
@ -164,7 +171,7 @@ Sequencer.prototype.proceedThread = function (thread) {
}
// If we still can't find a next block to run, mark the thread as done.
if (thread.peekStack() === null) {
thread.status = Thread.STATUS_DONE;
thread.setStatus(Thread.STATUS_DONE);
}
};