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				| @ -279,6 +279,7 @@ func (worker *Worker) exec(inpack *inPack) (err error) { | |||||||
| 		} | 		} | ||||||
| 		outpack.handle = inpack.handle | 		outpack.handle = inpack.handle | ||||||
| 		outpack.data = r.data | 		outpack.data = r.data | ||||||
|  | 		 //exec() maybe called concurrently, take care of race condition
 | ||||||
| 		inpack.a.write(outpack) | 		inpack.a.write(outpack) | ||||||
| 	} | 	} | ||||||
| 	return | 	return | ||||||
|  | |||||||
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