generic_dispatch_lock.swift

generic_dispatch_lock.swift

@inline(__always) func with<T>(queue: dispatch_queue_t, @autoclosure(escaping) get block: () -> T) -> T {
    assert(dispatch_queue_get_label(queue) != dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL), "Invoked dispatch_sync in a way that will deadlock")
    var result: T!
    dispatch_sync(queue) {
        result = block()
    }

    return result
}

@inline(__always) func with<T>(queue: dispatch_queue_t, @autoclosure(escaping) get block: () -> T?) -> T? {
    assert(dispatch_queue_get_label(queue) != dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL), "Invoked dispatch_sync in a way that will deadlock")
    var result: T?
    dispatch_sync(queue) {
        result = block()
    }

    return result
}

@inline(__always) func with(queue: dispatch_queue_t, @autoclosure(escaping) set block: () -> Void) {
    assert(dispatch_queue_get_label(queue) != dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL), "Invoked dispatch_sync in a way that will deadlock")
    dispatch_sync(queue, block)
}

@inline(__always) func with(queue: dispatch_queue_t, @autoclosure(escaping) barrierSet block: () -> Void) {
    assert(dispatch_queue_get_label(queue) != dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL), "Invoked dispatch_sync in a way that will deadlock")
    dispatch_barrier_sync(queue, block)
}