套件：golang-github-nozzle-throttler-dev（1.1-4）

Fill the gap between WaitGroup and manually monitor goroutines with channels

The API is almost identical to WaitGroups, but it allows you to set a max number of workers that can be running simultaneously. It uses channels internally to block until a job completes by calling Done() or until all jobs have been completed. It also provides a built in error channel that captures your goroutine errors and provides access to them as []error after you exit the loop.

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