Merge pull request #5 from tmickel/feature/sequencing
Add basics of threads and sequencing
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Tim Mickel committed
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+103
-2
@@ -1,16 +1,39 @@
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var EventEmitter = require('events');
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var Sequencer = require('./sequencer');
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var Thread = require('./thread');
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var util = require('util');
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/**
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* A simple runtime for blocks.
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* Manages blocks, stacks, and the sequencer.
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*/
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function Runtime () {
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// Bind event emitter
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EventEmitter.call(this);
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// State
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// State for the runtime
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/**
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* All blocks in the workspace.
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* Keys are block IDs, values are metadata about the block.
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* @type {Object.<string, Object>}
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*/
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this.blocks = {};
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/**
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* All stacks in the workspace.
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* A list of block IDs that represent stacks (first block in stack).
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* @type {Array.<String>}
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*/
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this.stacks = [];
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/**
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* A list of threads that are currently running in the VM.
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* Threads are added when execution starts and pruned when execution ends.
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* @type {Array.<Thread>}
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*/
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this.threads = [];
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/** @type {!Sequencer} */
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this.sequencer = new Sequencer(this);
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}
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/**
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@@ -18,6 +41,15 @@ function Runtime () {
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*/
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util.inherits(Runtime, EventEmitter);
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/**
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* How rapidly we try to step threads, in ms.
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*/
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Runtime.THREAD_STEP_INTERVAL = 1000 / 60;
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/**
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* Block management: create blocks and stacks from a `create` event
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* @param {!Object} block Blockly create event to be processed
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*/
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Runtime.prototype.createBlock = function (block) {
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// Create new block
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this.blocks[block.id] = block;
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@@ -38,6 +70,10 @@ Runtime.prototype.createBlock = function (block) {
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this.stacks.push(block.id);
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};
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/**
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* Block management: change block field values
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* @param {!Object} args Blockly change event to be processed
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*/
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Runtime.prototype.changeBlock = function (args) {
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// Validate
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if (args.element !== 'field') return;
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@@ -48,6 +84,10 @@ Runtime.prototype.changeBlock = function (args) {
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this.blocks[args.id].fields[args.name].value = args.value;
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};
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/**
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* Block management: move blocks from parent to parent
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* @param {!Object} e Blockly move event to be processed
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*/
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Runtime.prototype.moveBlock = function (e) {
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var _this = this;
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@@ -82,6 +122,10 @@ Runtime.prototype.moveBlock = function (e) {
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}
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};
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/**
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* Block management: delete blocks and their associated stacks
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* @param {!Object} e Blockly delete event to be processed
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*/
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Runtime.prototype.deleteBlock = function (e) {
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// @todo Stop threads running on this stack
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@@ -114,16 +158,73 @@ Runtime.prototype.deleteBlock = function (e) {
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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/**
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* Create a thread and push it to the list of threads.
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* @param {!string} id ID of block that starts the stack
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*/
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Runtime.prototype._pushThread = function (id) {
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if (this.stacks.indexOf(id) < -1) return;
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var thread = new Thread(id);
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this.threads.push(thread);
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};
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/**
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* Remove a thread from the list of threads.
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* @param {!string} id ID of block that starts the stack
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*/
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Runtime.prototype._removeThread = function (id) {
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var i = this.threads.indexOf(id);
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if (i > -1) this.threads.splice(i, 1);
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};
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/**
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* Repeatedly run `sequencer.stepThreads` and filter out
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* inactive threads after each iteration.
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*/
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Runtime.prototype._step = function () {
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var inactiveThreads = this.sequencer.stepThreads(this.threads);
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for (var i = 0; i < inactiveThreads.length; i++) {
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this._removeThread(inactiveThreads[i]);
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}
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};
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/**
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* Set up timers to repeatedly step in a browser
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*/
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Runtime.prototype.start = function () {
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if (!window.setInterval) return;
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window.setInterval(function() {
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this._step();
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}.bind(this), Runtime.THREAD_STEP_INTERVAL);
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};
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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/**
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* Helper to remove a stack from `this.stacks`
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* @param {?string} id ID of block that starts the stack
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*/
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Runtime.prototype._deleteStack = function (id) {
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var i = this.stacks.indexOf(id);
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if (i > -1) this.stacks.splice(i, 1);
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};
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/**
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* Helper to get the next block for a particular block
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* @param {?string} id ID of block to get the next block for
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* @return {?string} ID of next block in the sequence
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*/
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Runtime.prototype._getNextBlock = function (id) {
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if (typeof this.blocks[id] === 'undefined') return null;
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return this.blocks[id].next;
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};
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/**
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* Helper to get the substack for a particular C-shaped block
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* @param {?string} id ID for block to get the substack for
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* @return {?string} ID of block in the substack
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*/
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Runtime.prototype._getSubstack = function (id) {
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if (typeof this.blocks[id] === 'undefined') return null;
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return this.blocks[id].fields['SUBSTACK'];
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+64
-2
@@ -1,5 +1,67 @@
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function Sequencer () {
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// @todo
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var Timer = require('../util/timer');
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function Sequencer (runtime) {
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/**
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* A utility timer for timing thread sequencing.
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* @type {!Timer}
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*/
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this.timer = new Timer();
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/**
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* Reference to the runtime owning this sequencer.
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* @type {!Runtime}
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*/
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this.runtime = runtime;
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}
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/**
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* The sequencer does as much work as it can within WORK_TIME milliseconds,
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* then yields. This is essentially a rate-limiter for blocks.
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* In Scratch 2.0, this is set to 75% of the target stage frame-rate (30fps).
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* @const {!number}
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*/
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Sequencer.WORK_TIME = 1000 / 60;
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/**
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* Step through all threads in `this.threads`, running them in order.
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* @return {Array.<Thread>} All threads which have finished in this iteration.
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*/
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Sequencer.prototype.stepThreads = function (threads) {
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// Start counting toward WORK_TIME
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this.timer.start();
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// List of threads which have been killed by this step.
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var inactiveThreads = [];
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// While there are still threads to run and we are within WORK_TIME,
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// continue executing threads.
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while (threads.length > 0 &&
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this.timer.timeElapsed() < Sequencer.WORK_TIME) {
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// New threads at the end of the iteration.
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var newThreads = [];
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// Attempt to run each thread one time
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for (var i = 0; i < threads.length; i++) {
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var activeThread = threads[i];
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this.stepThread(activeThread);
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if (activeThread.nextBlock !== null) {
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newThreads.push(activeThread);
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} else {
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inactiveThreads.push(activeThread);
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}
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}
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// Effectively filters out threads that have stopped.
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threads = newThreads;
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}
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return inactiveThreads;
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};
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/**
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* Step the requested thread
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* @param {!Thread} thread Thread object to step
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*/
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Sequencer.prototype.stepThread = function (thread) {
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// @todo Actually run the blocks
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// Currently goes to the next block in the sequence.
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var nextBlock = this.runtime._getNextBlock(thread.nextBlock);
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thread.nextBlock = nextBlock;
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};
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module.exports = Sequencer;
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+17
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@@ -1,5 +1,20 @@
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function Thread () {
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// @todo
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/**
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* A thread is a running stack context and all the metadata needed.
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* @param {?string} firstBlock First block to execute in the thread.
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* @constructor
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*/
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function Thread (firstBlock) {
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/**
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* Next block that the thread will execute.
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* @type {string}
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*/
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this.nextBlock = firstBlock;
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/**
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* Stack for the thread. When the sequencer enters a control structure,
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* the block is pushed onto the stack so we know where to exit.
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* @type {Array.<string>}
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*/
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this.stack = [];
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}
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module.exports = Thread;
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+2
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@@ -13,8 +13,8 @@ Timer.prototype.start = function () {
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this.startTime = this.time();
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};
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Timer.prototype.stop = function () {
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return this.startTime - this.time();
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Timer.prototype.timeElapsed = function () {
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return this.time() - this.startTime;
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};
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module.exports = Timer;
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+7
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@@ -10,7 +10,7 @@ test('spec', function (t) {
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t.type(timer.startTime, 'number');
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t.type(timer.time, 'function');
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t.type(timer.start, 'function');
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t.type(timer.stop, 'function');
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t.type(timer.timeElapsed, 'function');
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t.end();
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});
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@@ -23,7 +23,7 @@ test('time', function (t) {
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t.end();
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});
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test('start / stop', function (t) {
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test('start / timeElapsed', function (t) {
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var timer = new Timer();
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var delay = 100;
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var threshold = 1000 / 60; // 60 hz
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@@ -31,10 +31,12 @@ test('start / stop', function (t) {
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// Start timer
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timer.start();
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// Wait and stop timer
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// Wait and measure timer
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setTimeout(function () {
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var stop = timer.stop();
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t.ok(stop >= -(delay + threshold) && stop <= -(delay - threshold));
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var timeElapsed = timer.timeElapsed();
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t.ok(timeElapsed >= 0);
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t.ok(timeElapsed >= (delay - threshold) &&
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timeElapsed <= (delay + threshold));
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t.end();
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}, delay);
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});
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@@ -1,10 +1,10 @@
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!function(t){function e(n){if(r[n])return r[n].exports;var i=r[n]={exports:{},id:n,loaded:!1};return t[n].call(i.exports,i,i.exports,e),i.loaded=!0,i.exports}var r={};return e.m=t,e.c=r,e.p="",e(0)}([function(t,e,r){function n(){var t=this;i.call(t),t.runtime=new s,t.blockListener=function(e){if("object"==typeof e&&"string"==typeof e.blockId)switch(e.type){case"create":t.runtime.createBlock(a(e));break;case"change":t.runtime.changeBlock({id:e.blockId,element:e.element,name:e.name,value:e.newValue});break;case"move":t.runtime.moveBlock({id:e.blockId,oldParent:e.oldParentId,oldField:e.oldInputName,newParent:e.newParentId,newField:e.newInputName});break;case"delete":t.runtime.deleteBlock({id:e.blockId})}}}var i=r(1),o=r(2),s=r(6),a=r(7);o.inherits(n,i),t.exports=n,"undefined"!=typeof window&&(window.VirtualMachine=t.exports)},function(t,e){function r(){this._events=this._events||{},this._maxListeners=this._maxListeners||void 0}function n(t){return"function"==typeof t}function i(t){return"number"==typeof t}function o(t){return"object"==typeof t&&null!==t}function s(t){return void 0===t}t.exports=r,r.EventEmitter=r,r.prototype._events=void 0,r.prototype._maxListeners=void 0,r.defaultMaxListeners=10,r.prototype.setMaxListeners=function(t){if(!i(t)||0>t||isNaN(t))throw TypeError("n must be a positive number");return this._maxListeners=t,this},r.prototype.emit=function(t){var e,r,i,a,c,u;if(this._events||(this._events={}),"error"===t&&(!this._events.error||o(this._events.error)&&!this._events.error.length)){if(e=arguments[1],e instanceof Error)throw e;throw TypeError('Uncaught, unspecified "error" event.')}if(r=this._events[t],s(r))return!1;if(n(r))switch(arguments.length){case 1:r.call(this);break;case 2:r.call(this,arguments[1]);break;case 3:r.call(this,arguments[1],arguments[2]);break;default:a=Array.prototype.slice.call(arguments,1),r.apply(this,a)}else if(o(r))for(a=Array.prototype.slice.call(arguments,1),u=r.slice(),i=u.length,c=0;i>c;c++)u[c].apply(this,a);return!0},r.prototype.addListener=function(t,e){var i;if(!n(e))throw TypeError("listener must be a function");return this._events||(this._events={}),this._events.newListener&&this.emit("newListener",t,n(e.listener)?e.listener:e),this._events[t]?o(this._events[t])?this._events[t].push(e):this._events[t]=[this._events[t],e]:this._events[t]=e,o(this._events[t])&&!this._events[t].warned&&(i=s(this._maxListeners)?r.defaultMaxListeners:this._maxListeners,i&&i>0&&this._events[t].length>i&&(this._events[t].warned=!0,console.error("(node) warning: possible EventEmitter memory leak detected. %d listeners added. Use emitter.setMaxListeners() to increase limit.",this._events[t].length),"function"==typeof console.trace&&console.trace())),this},r.prototype.on=r.prototype.addListener,r.prototype.once=function(t,e){function r(){this.removeListener(t,r),i||(i=!0,e.apply(this,arguments))}if(!n(e))throw TypeError("listener must be a function");var i=!1;return r.listener=e,this.on(t,r),this},r.prototype.removeListener=function(t,e){var r,i,s,a;if(!n(e))throw TypeError("listener must be a function");if(!this._events||!this._events[t])return this;if(r=this._events[t],s=r.length,i=-1,r===e||n(r.listener)&&r.listener===e)delete this._events[t],this._events.removeListener&&this.emit("removeListener",t,e);else if(o(r)){for(a=s;a-- >0;)if(r[a]===e||r[a].listener&&r[a].listener===e){i=a;break}if(0>i)return this;1===r.length?(r.length=0,delete this._events[t]):r.splice(i,1),this._events.removeListener&&this.emit("removeListener",t,e)}return this},r.prototype.removeAllListeners=function(t){var e,r;if(!this._events)return this;if(!this._events.removeListener)return 0===arguments.length?this._events={}:this._events[t]&&delete this._events[t],this;if(0===arguments.length){for(e in this._events)"removeListener"!==e&&this.removeAllListeners(e);return this.removeAllListeners("removeListener"),this._events={},this}if(r=this._events[t],n(r))this.removeListener(t,r);else if(r)for(;r.length;)this.removeListener(t,r[r.length-1]);return delete this._events[t],this},r.prototype.listeners=function(t){var e;return e=this._events&&this._events[t]?n(this._events[t])?[this._events[t]]:this._events[t].slice():[]},r.prototype.listenerCount=function(t){if(this._events){var e=this._events[t];if(n(e))return 1;if(e)return e.length}return 0},r.listenerCount=function(t,e){return t.listenerCount(e)}},function(t,e,r){(function(t,n){function i(t,r){var n={seen:[],stylize:s};return arguments.length>=3&&(n.depth=arguments[2]),arguments.length>=4&&(n.colors=arguments[3]),g(r)?n.showHidden=r:r&&e._extend(n,r),w(n.showHidden)&&(n.showHidden=!1),w(n.depth)&&(n.depth=2),w(n.colors)&&(n.colors=!1),w(n.customInspect)&&(n.customInspect=!0),n.colors&&(n.stylize=o),c(n,t,n.depth)}function o(t,e){var r=i.styles[e];return r?"["+i.colors[r][0]+"m"+t+"["+i.colors[r][1]+"m":t}function s(t,e){return t}function a(t){var e={};return t.forEach(function(t,r){e[t]=!0}),e}function c(t,r,n){if(t.customInspect&&r&&T(r.inspect)&&r.inspecLine truncated
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||||
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||||
*
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||||
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||||
* @license MIT
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||||
*/
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Reference in new issue
Block a user