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Process many internal cycles per wakeup; avoid reentrancy

This commit is contained in:
Tony Garnock-Jones 2016-05-15 14:56:19 -04:00
parent 51d9d4b64e
commit 6a204a9085
1 changed files with 22 additions and 5 deletions
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27
js/src/ground.js
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@ -6,6 +6,8 @@ var Dataspace = require('./dataspace.js').Dataspace;
function Ground(bootFn) {
var self = this;
this.stepperId = null;
this.stepping = false;
this.startingFuel = 100;
this.baseStack = Immutable.List.of({ dataspace: this, activePid: -1 });
Dataspace.withDataspaceStack(this.baseStack, function () {
self.dataspace = new Dataspace(bootFn);
@ -31,12 +33,27 @@ Ground.prototype.markRunnable = function (pid) {
Ground.prototype.startStepping = function () {
var self = this;
if (this.stepperId) return;
if (this.step()) {
this.stepperId = setTimeout(function () {
self.stepperId = null;
self.startStepping();
}, 0);
if (this.stepping) return;
this.stepping = true;
try {
var stillBusy = false;
for (var fuel = this.startingFuel; fuel > 0; fuel--) {
stillBusy = this.step();
if (!stillBusy) break;
}
if (stillBusy) {
this.stepperId = setTimeout(function () {
self.stepperId = null;
self.startStepping();
}, 0);
}
} catch (e) {
this.stepping = false;
throw e;
}
this.stepping = false;
return this; // because the syndicatec compiler chains startStepping after the ctor
};