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Thread-safe Paho C messageArrived callback [message #1753827]

Fri, 10 February 2017 13:14

Manav Mehta

Messages: 4
Registered: December 2016

Junior Member

I have a question on the Paho MQTT C client's messageArrived callback.

Does the Paho C client sequentially invoke the messageArrived callback so that it waits for one message to be processed (i.e. for the callback handler to return), before invoking the callback for the next message; or can it invoke them in parallel such that my application could have multiple messageArrived instances running in different threads?

I need to know whether or not to write thread-safe code inside my callback handler.

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Re: Thread-safe Paho C messageArrived callback [message #1755069 is a reply to message #1753827]

Mon, 27 February 2017 18:50

Manav Mehta

Messages: 4
Registered: December 2016

Junior Member

Just want to check back to see if anyone has any feedback on this question. From reviewing the Paho C client code ourselves, it appears to us that only one thread is created for processing all messages, but it would be nice to have confirmation from someone with knowledge on this subject.

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