Hello All, I have written a program in opencv to fetch an image form camera and save in it folder. There is another program which takes the program form the same folder and do some computation of the image. I combined both the program and put the second logic in thread. Now the problem is what is figured is: The main program tries to save the image in the same program and at the same time the thread tries to read different image form the same folder. So sometimes the image is saved but only half of the image is saved and other half contains no data. Also the thread breaks. I tried using QMutex but the issue was the thread break if the main thread is already lock. The summary of the problem is: ->How can i provide synchronization between the thread. ->How should i make the other thread to wait until the lock is not released.

@ Kira said in Issue with threading and opecv : Suppose i queue the signal/slots related to this program will it affect the other signal/slots written in my program . For ex: delay in execution of the signal/slots of the main program. Queued signals do not block anything - they are just in a queue. The only delay you will have is the slot when it is actually called - but that you will have anyway as you have to execute the code anyway, right? "How to make a mutex wait for the previous lock if we are not sure how much time it is going to take" - I don't understand this question. A mutex either blocks the thread which wants to lock if the mutex is already locked, or you can continue immediately. So, you already have this "waiting" if the mutex is already locked.

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Issue with threading and opencv

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Kira

wrote on 17 Jun 2019, 08:52 last edited by

#41

@jsulm @J-Hilk :
Thanks both of you in helping to figure it out.
Actually this forum remains my first choice for any answers because of the quick response and supportive people.

Thanks once again
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17 Jun 2019, 08:52