1 #include <petsc/private/tsimpl.h> /*I "petscts.h" I*/ 2 3 PetscFunctionList TSList = NULL; 4 PetscBool TSRegisterAllCalled = PETSC_FALSE; 5 6 /*@C 7 TSSetType - Sets the method to be used as the timestepping solver. 8 9 Collective on TS 10 11 Input Parameters: 12 + ts - The TS context 13 - type - A known method 14 15 Options Database Command: 16 . -ts_type <type> - Sets the method; use -help for a list of available methods (for instance, euler) 17 18 Notes: 19 See "petsc/include/petscts.h" for available methods (for instance) 20 + TSEULER - Euler 21 . TSSUNDIALS - SUNDIALS interface 22 . TSBEULER - Backward Euler 23 - TSPSEUDO - Pseudo-timestepping 24 25 Normally, it is best to use the TSSetFromOptions() command and 26 then set the TS type from the options database rather than by using 27 this routine. Using the options database provides the user with 28 maximum flexibility in evaluating the many different solvers. 29 The TSSetType() routine is provided for those situations where it 30 is necessary to set the timestepping solver independently of the 31 command line or options database. This might be the case, for example, 32 when the choice of solver changes during the execution of the 33 program, and the user's application is taking responsibility for 34 choosing the appropriate method. In other words, this routine is 35 not for beginners. 36 37 Level: intermediate 38 39 .seealso: TS, TSSolve(), TSCreate(), TSSetFromOptions(), TSDestroy(), TSType 40 41 @*/ 42 PetscErrorCode TSSetType(TS ts,TSType type) 43 { 44 PetscErrorCode (*r)(TS); 45 PetscBool match; 46 PetscErrorCode ierr; 47 48 PetscFunctionBegin; 49 PetscValidHeaderSpecific(ts, TS_CLASSID,1); 50 PetscValidCharPointer(type,2); 51 ierr = PetscObjectTypeCompare((PetscObject) ts, type, &match);CHKERRQ(ierr); 52 if (match) PetscFunctionReturn(0); 53 54 ierr = PetscFunctionListFind(TSList,type,&r);CHKERRQ(ierr); 55 if (!r) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_ARG_UNKNOWN_TYPE, "Unknown TS type: %s", type); 56 if (ts->ops->destroy) { 57 ierr = (*(ts)->ops->destroy)(ts);CHKERRQ(ierr); 58 } 59 ierr = PetscMemzero(ts->ops,sizeof(*ts->ops));CHKERRQ(ierr); 60 ts->usessnes = PETSC_FALSE; 61 ts->default_adapt_type = TSADAPTNONE; 62 63 ts->setupcalled = PETSC_FALSE; 64 65 ierr = PetscObjectChangeTypeName((PetscObject)ts, type);CHKERRQ(ierr); 66 ierr = (*r)(ts);CHKERRQ(ierr); 67 PetscFunctionReturn(0); 68 } 69 70 /*@C 71 TSGetType - Gets the TS method type (as a string). 72 73 Not Collective 74 75 Input Parameter: 76 . ts - The TS 77 78 Output Parameter: 79 . type - The name of TS method 80 81 Level: intermediate 82 83 .seealso TSSetType() 84 @*/ 85 PetscErrorCode TSGetType(TS ts, TSType *type) 86 { 87 PetscFunctionBegin; 88 PetscValidHeaderSpecific(ts,TS_CLASSID,1); 89 PetscValidPointer(type,2); 90 *type = ((PetscObject)ts)->type_name; 91 PetscFunctionReturn(0); 92 } 93 94 /*--------------------------------------------------------------------------------------------------------------------*/ 95 96 /*@C 97 TSRegister - Adds a creation method to the TS package. 98 99 Not Collective 100 101 Input Parameters: 102 + name - The name of a new user-defined creation routine 103 - create_func - The creation routine itself 104 105 Notes: 106 TSRegister() may be called multiple times to add several user-defined tses. 107 108 Sample usage: 109 .vb 110 TSRegister("my_ts", MyTSCreate); 111 .ve 112 113 Then, your ts type can be chosen with the procedural interface via 114 .vb 115 TS ts; 116 TSCreate(MPI_Comm, &ts); 117 TSSetType(ts, "my_ts") 118 .ve 119 or at runtime via the option 120 .vb 121 -ts_type my_ts 122 .ve 123 124 Level: advanced 125 126 .seealso: TSRegisterAll(), TSRegisterDestroy() 127 @*/ 128 PetscErrorCode TSRegister(const char sname[], PetscErrorCode (*function)(TS)) 129 { 130 PetscErrorCode ierr; 131 132 PetscFunctionBegin; 133 ierr = TSInitializePackage();CHKERRQ(ierr); 134 ierr = PetscFunctionListAdd(&TSList,sname,function);CHKERRQ(ierr); 135 PetscFunctionReturn(0); 136 } 137 138