:orphan: # PetscOmpCtrlOmpRegionOnMasterEnd Mark the end of an OpenMP library call on master ranks ## Synopsis ``` #include "petscsys.h" PetscErrorCode PetscOmpCtrlOmpRegionOnMasterEnd(PetscOmpCtrl ctrl) ``` ## Input Parameter - ***ctrl -*** a PETSc OMP controller ## Note Only master ranks can call this function. Call `PetscOmpCtrlGetOmpComms()` to know if this is a master rank. This function restores the CPU binding of master ranks and set and nthreads-var of OpenMP runtime to 1. ## See Also `PetscOmpCtrlOmpRegionOnMasterBegin()`, `PetscOmpCtrlCreate()`, `PetscOmpCtrlDestroy()`, `PetscOmpCtrlBarrier()` ## Level developer ## Location src/sys/utils/mpishm.c --- [Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/sys/utils/mpishm.c) [Index of all Sys routines](index.md) [Table of Contents for all manual pages](/manualpages/index.md) [Index of all manual pages](/manualpages/singleindex.md)