Function create_mspace

dlmalloc/dlmalloc.c:4736–4767

}

mspace create_mspace(size_t capacity, int locked) {
  mstate m = 0;
  size_t msize = pad_request(sizeof(struct malloc_state));
  init_mparams(); /* Ensure pagesize etc initialized */

  if (capacity < (size_t) -(msize + TOP_FOOT_SIZE + mparams.page_size)) {
    size_t rs = (capacity + TOP_FOOT_SIZE + msize);
    size_t tsize = granularity_align(rs);
    char* tbase = (char*)(CALL_MMAP(tsize));
    if (tbase == CMFAIL) {
        tbase = malloc(tsize);
        if (tbase == NULL)
            tbase = CMFAIL;
    }
    if (tbase != CMFAIL) {
      m = init_user_mstate(tbase, tsize);
      m->seg.sflags = IS_MMAPPED_BIT;
      set_lock(m, locked);
    }
  }

  if (m != NULL) {
      m->allocfunc = 0;
      m->alloc0func = 0;
      m->destfunc = 0;
      m->reallocfunc = 0;
      m->nallocs = 0;
      ZERO_HIST(m);
  }

  return (mspace) m;
}

void mspace_setmorecore(mspace msp, void*(*allocfunc)(size_t)) {
    mstate m = (mstate) msp;