Created
May 22, 2011 06:48
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| import threading | |
| class MapThread(threading.Thread): | |
| def initialize(self, function, sequence, *args): | |
| self._function = function | |
| self._sequence = sequence | |
| self._args = args | |
| def run(self): | |
| self._result = map(self._function, self._sequence, *self._args) | |
| def threaded_map(nthreads, function, sequence, *args): | |
| threads = [MapThread() for i in xrange(nthreads)] | |
| n = len(sequence) | |
| seq_lengths = [i * n / nthreads for i in xrange(nthreads+1)] | |
| for i in xrange(nthreads): | |
| seq = sequence[seq_lengths[i]:seq_lengths[i+1]] | |
| nargs = () | |
| for arg in args: | |
| nargs += (arg[seq_lengths[i]:seq_lengths[i+1]]) | |
| threads[i].initialize(function, seq, *nargs) | |
| threads[i].start() | |
| result = [] | |
| for thread in threads: | |
| thread.join() | |
| result += thread._result | |
| return result |
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