coroutine_extensions.kt

fun <T> async(context: CoroutineContext = CommonPool, start: CoroutineStart = CoroutineStart.DEFAULT, block: suspend CoroutineScope.() -> T)
        = kotlinx.coroutines.experimental.async(context, start, block)

fun ui(start: CoroutineStart = CoroutineStart.DEFAULT, block: suspend CoroutineScope.() -> Unit)
        = launch(UI, start, block)

suspend fun <T, U> parallel(c1: suspend CoroutineScope.() -> T, c2: suspend CoroutineScope.() -> U): Pair<T, U> {
    val c1Job = async(block = c1)
    val c2Job = async(block = c2)
    return Pair(c1Job.await(), c2Job.await())
}

suspend fun <T, U, V> parallel(c1: suspend CoroutineScope.() -> T, c2: suspend CoroutineScope.() -> U, c3: suspend CoroutineScope.() -> V): Triple<T, U, V> {
    val c1Job = async(block = c1)
    val c2Job = async(block = c2)
    val c3Job = async(block = c3)
    return Triple(c1Job.await(), c2Job.await(), c3Job.await())
}

use.kt

val (user, article) = parallel(
  { usersApi.me() },
  { articlesApi.getPublicTimeline() }
)