MQI function calls within signal handlers

 

While you are in a signal handler, do not call an MQI function. If you try to call an MQI function from a signal handler while another MQI function is active, MQRC_CALL_IN_PROGRESS is returned. If you try to call an MQI function from a signal handler while no other MQI function is active, it is likely to fail sometime during the operation because of the operating system restrictions where only selective calls can be issued from, or within, a handler.

In the case of C++ destructor methods, which may be called automatically during program exit, you might not be able to stop the MQI functions from being called. Ignore any errors about MQRC_CALL_IN_PROGRESS. If a signal handler calls exit(), WebSphere MQ backs out uncommitted messages in syncpoint as usual and closes any open queues.

 

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Additional considerations

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