1 #include <petsc/private/viewerimpl.h> 2 #include <petscviewersaws.h> 3 #include <petscsys.h> 4 5 /* 6 The variable Petsc_Viewer_SAWs_keyval is used to indicate an MPI attribute that 7 is attached to a communicator, in this case the attribute is a PetscViewer. 8 */ 9 static PetscMPIInt Petsc_Viewer_SAWs_keyval = MPI_KEYVAL_INVALID; 10 11 /*@C 12 PETSC_VIEWER_SAWS_ - Creates a SAWs `PetscViewer` shared by all MPI processes in a communicator. 13 14 Collective 15 16 Input Parameter: 17 . comm - the MPI communicator to share the `PetscViewer` 18 19 Level: developer 20 21 Note: 22 Unlike almost all other PETSc routines, `PETSC_VIEWER_SAWS_()` does not return 23 an error code. The resulting `PetscViewer` is usually used in the form 24 $ XXXView(XXX object, PETSC_VIEWER_SAWS_(comm)); 25 26 .seealso: [](sec_viewers), `PetscViewer`, `PETSC_VIEWER_SAWS_WORLD`, `PETSC_VIEWER_SAWS_SELF` 27 @*/ 28 PetscViewer PETSC_VIEWER_SAWS_(MPI_Comm comm) 29 { 30 PetscErrorCode ierr; 31 PetscMPIInt flag; 32 PetscViewer viewer; 33 MPI_Comm ncomm; 34 35 PetscFunctionBegin; 36 PetscCallNull(PetscCommDuplicate(comm, &ncomm, NULL)); 37 if (Petsc_Viewer_SAWs_keyval == MPI_KEYVAL_INVALID) { PetscCallMPINull(MPI_Comm_create_keyval(MPI_COMM_NULL_COPY_FN, MPI_COMM_NULL_DELETE_FN, &Petsc_Viewer_SAWs_keyval, 0)); } 38 ierr = (PetscErrorCode)MPI_Comm_get_attr(ncomm, Petsc_Viewer_SAWs_keyval, (void **)&viewer, &flag); 39 if (ierr) { 40 ierr = PetscError(ncomm, __LINE__, "PETSC_VIEWER_SAWS_", __FILE__, PETSC_ERR_MPI, PETSC_ERROR_INITIAL, " "); 41 PetscFunctionReturn(NULL); 42 } 43 if (!flag) { /* PetscViewer not yet created */ 44 PetscCallNull(PetscViewerSAWsOpen(comm, &viewer)); 45 PetscCallNull(PetscObjectRegisterDestroy((PetscObject)viewer)); 46 ierr = (PetscErrorCode)MPI_Comm_set_attr(ncomm, Petsc_Viewer_SAWs_keyval, (void *)viewer); 47 if (ierr) { 48 ierr = PetscError(ncomm, __LINE__, "PETSC_VIEWER_SAWS_", __FILE__, PETSC_ERR_MPI, PETSC_ERROR_INITIAL, " "); 49 PetscFunctionReturn(NULL); 50 } 51 } 52 PetscCallNull(PetscCommDestroy(&ncomm)); 53 PetscFunctionReturn(viewer); 54 } 55 56 static PetscErrorCode PetscViewerDestroy_SAWs(PetscViewer viewer) 57 { 58 PetscFunctionBegin; 59 /* 60 Make sure that we mark that the stack is no longer published 61 */ 62 if (PetscObjectComm((PetscObject)viewer) == PETSC_COMM_WORLD) PetscCall(PetscStackSAWsViewOff()); 63 PetscFunctionReturn(PETSC_SUCCESS); 64 } 65 66 PETSC_EXTERN PetscErrorCode PetscViewerCreate_SAWs(PetscViewer v) 67 { 68 PetscFunctionBegin; 69 v->ops->destroy = PetscViewerDestroy_SAWs; 70 PetscFunctionReturn(PETSC_SUCCESS); 71 } 72