如何让另一个异步调用等待？

如果其中一个调用在继续其他调用之前需要先完成的条件，如何暂停另一个异步调用？从下面的代码（简化）来看，当makeRequest得到401时，它应该调用refreshSession并暂停其他调用，直到这个调用完成。

let refreshSessionDispatchQueue = DispatchQueue(label: "refreshSession")
var refreshSessionJobQueue: [APIRequest] = []

// This function will be called by each of APIs that got 401 error code
private func refreshSession(errorCode: String? = nil, request: APIRequest) {
    refreshSessionDispatchQueue.async {
        self.refreshSessionJobQueue.append(request)
    }

    // The idea is, after all job appended to the jobQueue, let says after 1', it will call another function to execute another job
    DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1) {
        self.executeRefreshSessionJobQueue()
    }
}

// This is to execute refreshSession, and if it's succeed, all job on the jobQueue will be re-executed
private func executeRefreshSessionJobQueue() {
    DispatchQueue.main.async {
        let readyToRefreshSessionJobQueue = self.refreshSessionJobQueue
        
        if self.refreshSessionJobQueue.count > 0 {
            self.refreshSessionJobQueue = []

            self.refreshSession { [weak self] succeed in
                if succeed {
                    for job in readyToRefreshSessionJobQueue {
                        self?.makeRequest(baseURL: job.baseURL, endpoint: job.endpoint, method: job.method, encoding: job.encoding, headers: job.headers, params: job.params, customBody: job.customBody, completion: job.completion)
                    }
                    self?.refreshSessionJobQueue = []
                } else {
                    // And if it's failed, all the job should be removed and redirect the page to the login page
                    self?.refreshSessionJobQueue = []
                    ErrorHandler.relogin()
                }
            }
            
        }
    }
}