QNX RTOS v4 Knowledge Base
  
QNX RTOS v4 Knowledge Base
  
    
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            | Title | Specifying the order of PhAB callbacks |  
            | Ref. No. | QNX.000001282 |  
            | Category(ies) | Development |  
            | Issue | We are using PhAB, and have several callbacks. How can we specify the order that they are executed in if they are all called at the same time? 
 
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            | Solution | In the callback list within PhAB, list your callbacks in order of execution.  i.e. The first callback on the list will be executed first. If you return Pt_END from one of these callbacks, the chain of execution of the callbacks will end.
 
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