PETSc version 3.17.0
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# PetscCallMPI

Checks error code returned from MPI calls, if non-zero it calls the error handler and then returns

### Synopsis

    #include <petscerror.h>
    void PetscCallMPI(PetscErrorCode ierr)

Not Collective

### Input Parameters

| ierr | - nonzero error code, see the list of standard error codes in include/petscerror.h

### Notes

Always returns the error code PETSC_ERR_MPI; the MPI error code and string are embedded in the string error message. Do not use this to call any other routines (for example PETSc routines), it should only be used for direct MPI calls. Due to limitations of the preprocessor this can unfortunately not easily be enforced, so the user should take care to check this themselves.

### Example Usage

      PetscCallMPI(MPI_Comm_size(...)); // OK, calling MPI function

      PetscCallMPI(PetscFunction(...)); // ERROR, use PetscCall() instead!

### See Also

SETERRMPI(), PetscCall(), SETERRQ(), SETERRABORT(), PetscCallAbort(),
PetscTraceBackErrorHandler(), PetscPushErrorHandler(), PetscError(), CHKMEMQ

### Level

beginner

### Location

src/sys/error/../../../include/petscerror.h

### Examples

src/sys/classes/random/tutorials/ex1.c.html
src/sys/classes/random/tutorials/ex2.c.html
src/sys/tutorials/ex1.c.html
src/sys/tutorials/ex2.c.html
src/sys/tutorials/ex3.c.html
src/sys/tutorials/ex4.c.html
src/sys/tutorials/ex16.c.html
src/vec/vec/tutorials/ex2.c.html
src/vec/vec/tutorials/ex3.c.html
src/vec/vec/tutorials/ex5.c.html
src/vec/vec/tutorials/ex6.c.html
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