semaphore not waiting for second time function call for web service in ios

I have class with multiple function. In that class two functions I have called web service, the first web service function works proper. But second web service method not waiting for response from the service it can automatically call another service I have Used

let saveSemaphore = dispatch_semaphore_create(0) as dispatch_semaphore_tlet count = arrDeleteExecutionDetails.countfor (index, object) in arrDeleteExecutionDetails.enumerate(){    Common.checklistExecute = object    let request = "\(Common.webServiceURL!)/ProInspectorJson.svc/DeleteExecutionDetails?pExecutionDetailsId=\(object.id_ExecutionDetails!)"    let webservice = WebServiceCall(url: request, delegate: self)    webservice.webServiceGetMethod(request)    if index != count-1    {        dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER)    }    else    {        dispatch_semaphore_signal(semaphore)    }

The above method working properly

for checklistExecution in arrExecutionDetails{    Common.checklistExecute = checklistExecution    let request = "\(Common.webServiceURL!)/ProInspectorJson.svc/SaveExecutionV3?scheduleID=\(checklistExecution.id_Agendamentor!)&userID=\(Common.userId!)&ID_PI_ChecklistConfiguration=\(checklistExecution.id_ChecklistConfig!)&Observations=\(checklistExecution.observation!)&ID_PI_tblMastRiskFactor=\(checklistExecution.id_RiskFactor!)&CorrectiveAction=\(checklistExecution.correctiveActions!)&ID_PI_FormulaResultsHeader=0&Longitude=0&Lattitude=0&checklistExecutionId=\(checklistExecution.id_ExecutionDetails!)&ErrorCode=0&ID_PI_ObjectSubCategory=\(checklistExecution.objectSubCategory!)"    let webservice = WebServiceCall(url: request, delegate: self)    webservice.webServiceGetMethod(request)    dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER)}

But the second one not working

for loop have 5 element, the 5 elements called simultaneously. It is not waiting for first service response.

dispatch_semaphore_signal(semaphore)

I have called perfectly.