func doConcurrentTest(c *test.C, ct func()) {
maxProcs, numReqs := 1, 150
if testing.Short() {
maxProcs, numReqs = 4, 50
}
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(maxProcs))
var wg sync.WaitGroup
wg.Add(numReqs)
reqs := make(chan bool)
defer close(reqs)
for i := 0; i < maxProcs*2; i++ {
go func() {
for _ = range reqs {
ct()
if c.Failed() {
wg.Done()
continue
}
wg.Done()
}
}()
}
for i := 0; i < numReqs; i++ {
reqs <- true
}
wg.Wait()
}