[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [IWorkerPool](./rc-js-util.iworkerpool.md) ## IWorkerPool interface A shared pool of web workers to run jobs off the main thread. **Signature:** ```typescript export interface IWorkerPool extends IManagedObject, IPointer ``` **Extends:** [IManagedObject](./rc-js-util.imanagedobject.md), [IPointer](./rc-js-util.ipointer.md) ## Remarks If you know the number of threads you need, use `-sPTHREAD_POOL_SIZE=` to allocate them up front. ## Methods

Method	Description
[addJob(jobPtr)](./rc-js-util.iworkerpool.addjob.md)	Transfer unique ownership of the job to the pool. If the pool is running, the job should eventually be run.
[areWorkersSynced()](./rc-js-util.iworkerpool.areworkerssynced.md)	Becomes true once only "valid" jobs are running i.e. all the invalid jobs are gone - use in combination with [IWorkerPool.invalidateBatch()](./rc-js-util.iworkerpool.invalidatebatch.md).
[hasPendingWork()](./rc-js-util.iworkerpool.haspendingwork.md)	True if there is any job which has yet to be run. The answer is guaranteed correct on the producer thread.
[invalidateBatch()](./rc-js-util.iworkerpool.invalidatebatch.md)	Cancel any outstanding jobs, does not kill the current job (which must complete first).
[isBatchDone()](./rc-js-util.iworkerpool.isbatchdone.md)	This can be polled using [promisePoll()](./rc-js-util.promisepoll.md).;
[isRunning()](./rc-js-util.iworkerpool.isrunning.md)
[setBatchEnd()](./rc-js-util.iworkerpool.setbatchend.md)	After adding jobs, you can mark the last job on each worker to track when they have all be completed using [IWorkerPool.isBatchDone()](./rc-js-util.iworkerpool.isbatchdone.md).
[start()](./rc-js-util.iworkerpool.start.md)
[stop()](./rc-js-util.iworkerpool.stop.md)