waitgroupext provides extended WaitGroups that are similar in usage
and API to sync.WaitGroup save for the presence of a WaitChan()
function. This returns a channel that can be selected upon to wait
for a WaitGroup, allowing an interruptible wait.
Benchmarks are a little slower than conventional waitgroups:
Conventional Waitgroups
$ go test -bench WaitGroup
PASS
BenchmarkWaitGroupUncontended-4 100000000 15.4 ns/op
BenchmarkWaitGroupAddDone-4 30000000 50.2 ns/op
BenchmarkWaitGroupAddDoneWork-4 30000000 60.7 ns/op
BenchmarkWaitGroupWait-4 1000000000 2.97 ns/op
BenchmarkWaitGroupWaitWork-4 30000000 46.9 ns/op
BenchmarkWaitGroupActuallyWait-4 5000000 235 ns/op
16 B/op 1 allocs/op
ok sync 11.662s
waitgroupext WaitGroups
$ go test -bench .
PASS
BenchmarkWaitGroupUncontended-4 10000000 128 ns/op
BenchmarkWaitGroupAddDone-4 30000000 57.9 ns/op
BenchmarkWaitGroupAddDoneWork-4 20000000 59.1 ns/op
BenchmarkWaitGroupWait-4 500000000 3.03 ns/op
BenchmarkWaitGroupWaitWork-4 30000000 47.8 ns/op
BenchmarkWaitGroupActuallyWait-4 5000000 348 ns/op
128 B/op 2 allocs/op
ok github.com/abligh/waitgroupext 9.877s
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