103 lines
2.4 KiB
JavaScript
103 lines
2.4 KiB
JavaScript
module.exports.run = runThread;
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module.exports.runParallel = runParallel;
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var q = [];
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var pending = [];
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function finishq()
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{
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for (var i = 0; i < q.length; i++)
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{
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if (q[i]._done)
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{
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q.splice(i, 1);
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i--;
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}
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}
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while (pending.length > 0 && q.length < pending[0][2])
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{
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var t = pending.shift();
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q.push(t[0]);
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process.nextTick(t[1]);
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}
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}
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var tid = 0;
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function runThread(main, arg, done)
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{
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var thread = function()
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{
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// pass parameters as yield result
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var pass = Array.prototype.slice.call(arguments, 0);
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var v;
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try
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{
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v = thread.gen.next(pass);
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}
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catch (e)
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{
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v = { done: 1, error: e };
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}
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if (v.done)
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{
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thread._done = true;
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process.nextTick(finishq);
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}
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if (v.error)
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throw v.error;
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if (v.done && done)
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done(v.value);
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};
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thread.id = tid++;
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thread.gen = main(thread, arg);
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thread.throttle = function(count)
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{
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finishq();
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if (q.length < count)
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{
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q.push(thread);
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process.nextTick(thread.cb());
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}
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else
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{
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pending.push([ thread, thread.cb(), count ]);
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}
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};
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thread.cb = function()
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{
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var fn = function()
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{
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if (thread._current != fn)
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{
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throw new Error('Broken control flow! Callback'+
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thread._current._stack.replace(/^\s*Error\s*at Function\.thread\.cb\s*\([^)]*\)/, '')+
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'\nmust be called to resume thread, but this one is called instead:'+
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fn._stack.replace(/^\s*Error\s*at Function\.thread\.cb\s*\([^)]*\)/, '')+'\n--'
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);
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}
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return thread.apply(thread, arguments);
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};
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fn._stack = new Error().stack;
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thread._current = fn;
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return fn;
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};
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thread();
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}
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function runParallel(threads, done)
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{
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var results = [];
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var resultCount = 0;
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var allDone = function(i, result)
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{
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if (!results[i])
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{
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results[i] = result;
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resultCount++;
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if (resultCount == threads.length)
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done(results);
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}
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};
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threads.map((t, i) => runThread(t, null, function(result) { allDone(i, result); }));
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}
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