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package sort
import (
"sync"
"codeberg.org/snonux/algorithms/ds"
)
func ParallelMerge[V ds.Number](a ds.ArrayList[V]) ds.ArrayList[V] {
parallelMerge[V](a, make(ds.ArrayList[V], len(a)))
return a
}
func parallelMerge[V ds.Number](a, aux ds.ArrayList[V]) {
l := len(a)
if l < 1000 {
mergeSort(a, aux)
return
}
mi := l / 2
var wg sync.WaitGroup
wg.Add(2)
go func() {
parallelMerge(a[0:mi], aux[0:mi])
wg.Done()
}()
go func() {
parallelMerge(a[mi:], aux[mi:])
wg.Done()
}()
wg.Wait()
merge(a, aux, 0, mi, l-1)
}
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