Actual source code: sprng.c
petsc-3.10.5 2019-03-28
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      2:  #include <../src/sys/classes/random/randomimpl.h>

      4: #define USE_MPI
      5: #define SIMPLE_SPRNG
      6: EXTERN_C_BEGIN
      7: #include <sprng.h>
      8: EXTERN_C_END

     10: PetscErrorCode  PetscRandomSeed_Sprng(PetscRandom r)
     11: {
     13:   init_sprng(r->seed,SPRNG_DEFAULT);
     14:   return(0);
     15: }

     17: PetscErrorCode  PetscRandomGetValue_Sprng(PetscRandom r,PetscScalar *val)
     18: {
     20: #if defined(PETSC_USE_COMPLEX)
     21:   if (r->iset) {
     22:     *val = PetscRealPart(r->width)*sprng() + PetscRealPart(r->low) + (PetscImaginaryPart(r->width)*sprng() + PetscImaginaryPart(r->low)) * PETSC_i;
     23:   } else {
     24:     *val = sprng() + sprng()*PETSC_i;
     25:   }
     26: #else
     27:   if (r->iset) *val = r->width * sprng() + r->low;
     28:   else         *val = sprng();
     29: #endif
     30:   return(0);
     31: }

     33: PetscErrorCode  PetscRandomGetValueReal_Sprng(PetscRandom r,PetscReal *val)
     34: {
     36: #if defined(PETSC_USE_COMPLEX)
     37:   if (r->iset) *val = PetscRealPart(r->width)*sprng() + PetscRealPart(r->low);
     38:   else         *val = sprng();
     39: #else
     40:   if (r->iset) *val = r->width * sprng() + r->low;
     41:   else         *val = sprng();
     42: #endif
     43:   return(0);
     44: }

     46: static struct _PetscRandomOps PetscRandomOps_Values = {
     47:   /* 0 */
     48:   PetscRandomSeed_Sprng,
     49:   PetscRandomGetValue_Sprng,
     50:   PetscRandomGetValueReal_Sprng,
     51:   0,
     52:   /* 5 */
     53:   0
     54: };

     56: /*MC
     57:    PETSCSPRNG- access to the publically available random number generator sprng

     59:    Options Database Keys:
     60: . -random_type <rand,rand48,sprng>

     62:   Level: beginner

     64:    PETSc must have been ./configure with the option --download-sprng to use
     65:    this random number generator.

     67:    This is NOT currently using a parallel random number generator. Sprng does have
     68:    an MPI version we should investigate.

     70: .seealso: RandomCreate(), RandomSetType(), PETSCRAND, PETSCRAND48
     71: M*/

     73: PETSC_EXTERN PetscErrorCode PetscRandomCreate_Sprng(PetscRandom r)
     74: {

     78:   PetscMemcpy(r->ops,&PetscRandomOps_Values,sizeof(PetscRandomOps_Values));
     79:   PetscObjectChangeTypeName((PetscObject)r,PETSCSPRNG);
     80:   return(0);
     81: }