[petsc-users] how to exit in SNES iteration

[WANG, LEI]

Dear all

I am writing a code for nonlinear mechanical problem with SNES. The code often stops inside of the iterations when computing the Jacobian or Function. I would like to force the code exit once some abnormal value appears, but do not know what function to use? I have tried to set the residual norm to a large value, iteration number to a large value, but seems those not work. What should I write in 'if(abnormal) ???' for exiting SNES iteration in the functions FormJacobian or FormFunction?

Cheers
Lei
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