This function executes a global procedure asynchronously, in its own thread, so that it does not slow down or interfere with other running scripts. The procedure is run on the project server, but it can be called by any local or remote client.

Function Group Execution Windows Embedded Thin Client Mobile Access
RunGlobalProcedureAsync Module Activity Asynchronous Supported Supported Not supported; see note Not supported


Web Studio Help ity runglobalprocedureasync.xml d158689e94 RunGlobalProcedureAsync

  RunGlobalProcedureAsync( strProcedureName )  RunGlobalProcedureAsync( strProcedureName, optStrArgument1, …, optStrArgumentN )  
The name of the procedure (i.e., a VBScript function or sub-routine defined in the Procedures folder) to run asynchronously.
optStrArgument1, …, optStrArgumentN
Values that are passed to the procedure’s parameters. Arguments must be passed as strings.

Returned value

If the procedure is successfully executed, then this function will return a thread ID that can be used with the RunGlobalProcedureAsyncGetStatus function. Otherwise, this function will return an error code:
Value Description
-1 Function is not supported on Viewer / Web Thin Client.
-2 Invalid number of parameters. You must specify at least the procedure name.
-3 Maximum number of threads exceeded. See note.
-4 Failed to compile VBScript parameters for execution.
-5 Failed to start the thread execution.
-100 Internal error. Please contact technical support.


It is very important to note that this function can only be called by background tasks (e.g., Math, Script, Scheduler) on the project server. It cannot be directly called from any project client, even if the project client is running on the same workstation or device as the project server, because the client process is single-threaded. To indirectly call the function from a project client, configure a Math or Script worksheet to execute on a tag/expression trigger, and then configure a project screen to activate the trigger when needed. For example, configure the worksheet to execute when the value of MyTag is 1, and then configure a Button screen object to toggle the value of MyTag when pressed.

Also, the maximum number of VBScript threads that can be executed asynchronously is configured by manually editing the project file (i.e., projectname.APP) to change the following setting:
  [Script]  MaxAsyncThreads=8  

The default number of threads is 8, but the only real limit is determined by the available system resources. Increasing the number of threads may decrease runtime performance.


Given the following procedure that is defined in the Procedures folder…
  Function AddMe(intNumber)    If intNumber >= 6 Then      AddMe = 0    Else      AddMe = intNumber + 2    End If  End Function  

…the procedure is run by calling the RunGlobalProcedureAsync function…

  RunGlobalProcedureAsync( "AddMe", "2" )  

…and the function returns a thread ID that can be used with the RunGlobalProcedureAsyncGetStatus function.