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package parallel
import (
"sync"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/sync/semaphore"
)
var (
// Maximum number of jobs that will be used.
// Set a low, but non-zero, default. We'll be overriding it by default
// anyways.
numThreads uint = 8
// Semaphore to control thread creation and ensure numThreads is
// respected.
jobControl *semaphore.Weighted
// Lock to control changing the semaphore - we don't want to do it
// while anyone is using it.
jobControlLock sync.RWMutex
)
// SetMaxThreads sets the number of threads that will be used for parallel jobs.
func SetMaxThreads(threads uint) error {
if threads == 0 {
return errors.New("must give a non-zero number of threads to execute with")
}
jobControlLock.Lock()
defer jobControlLock.Unlock()
numThreads = threads
jobControl = semaphore.NewWeighted(int64(threads))
logrus.Infof("Setting parallel job count to %d", threads)
return nil
}
// GetMaxThreads returns the current number of threads that will be used for
// parallel jobs.
func GetMaxThreads() uint {
return numThreads
}
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