00176: Synchronous SCALL versus asynchronous SCALL

Title:

Synchronous SCALL versus asynchronous SCALL

Description:

Under Visual PRO/5 you have your choice of a synchronous SCALL (the Visual PRO/5 program stops running until the system call returns), or an asynchronous SCALL (the Visual PRO/5 program continues, and can even exit before the SCALL finishes). The way to get an asynchronous SCALL is to add an ampersand (&) to the end of the command string. Without the trailing ampersand, you’ll get a synchronous SCALL. 

Example of a synchronous SCALL: 
>a=scall(“notepad”) 

Example of an asynchronous SCALL: 
>a=scall(“notepad&”) 

Last Modified: 12/19/1997 Product: Visual PRO/5 Operating System: Windows

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