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//------------------------------------------------------------------------------
// GB_calloc_memory: wrapper for calloc (actually uses malloc and memset)
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// A wrapper for calloc. Space is set to zero.
#include "GB.h"
//------------------------------------------------------------------------------
// GB_calloc_helper: malloc/memset to allocate an initialized block
//------------------------------------------------------------------------------
static inline void *GB_calloc_helper
(
// input/output:
size_t *size, // on input: # of bytes requested
// on output: # of bytes actually allocated
// input:
GB_Context Context
)
{
void *p = NULL ;
// determine the next higher power of 2
size_t size_requested = (*size) ;
(*size) = GB_IMAX (*size, 8) ;
int k = GB_CEIL_LOG2 (*size) ;
// if available, get the block from the pool
if (GB_Global_free_pool_limit_get (k) > 0)
{
// round up the size to the nearest power of two
(*size) = ((size_t) 1) << k ;
p = GB_Global_free_pool_get (k) ;
#ifdef GB_MEMDUMP
if (p != NULL) printf ("calloc from pool: %p %ld\n", p, *size) ;
#endif
}
if (p == NULL)
{
// no block in the free_pool, so allocate it
p = GB_Global_malloc_function (*size) ;
#ifdef GB_MEMDUMP
printf ("hard calloc %p %ld\n", p, *size) ;
#endif
}
#ifdef GB_MEMDUMP
GB_Global_free_pool_dump (2) ; GB_Global_memtable_dump ( ) ;
#endif
if (p != NULL)
{
// clear the block of memory with a parallel memset
GB_GET_NTHREADS_MAX (nthreads_max, chunk, Context) ;
GB_memset (p, 0, size_requested, nthreads_max) ;
}
return (p) ;
}
//------------------------------------------------------------------------------
// GB_calloc_memory
//------------------------------------------------------------------------------
GB_PUBLIC
void *GB_calloc_memory // pointer to allocated block of memory
(
size_t nitems, // number of items to allocate
size_t size_of_item, // sizeof each item
// output
size_t *size_allocated, // # of bytes actually allocated
GB_Context Context
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
ASSERT (size_allocated != NULL) ;
void *p ;
size_t size ;
// make sure at least one item is allocated
nitems = GB_IMAX (1, nitems) ;
// make sure at least one byte is allocated
size_of_item = GB_IMAX (1, size_of_item) ;
bool ok = GB_size_t_multiply (&size, nitems, size_of_item) ;
if (!ok || (((uint64_t) nitems) > GB_NMAX)
|| (((uint64_t) size_of_item) > GB_NMAX))
{
// overflow
(*size_allocated) = 0 ;
return (NULL) ;
}
//--------------------------------------------------------------------------
// allocate the memory block
//--------------------------------------------------------------------------
if (GB_Global_malloc_tracking_get ( ))
{
//----------------------------------------------------------------------
// for memory usage testing only
//----------------------------------------------------------------------
// brutal memory debug; pretend to fail if (count-- <= 0).
bool pretend_to_fail = false ;
if (GB_Global_malloc_debug_get ( ))
{
pretend_to_fail = GB_Global_malloc_debug_count_decrement ( ) ;
}
// allocate the memory
if (pretend_to_fail)
{
p = NULL ;
}
else
{
p = GB_calloc_helper (&size, Context) ;
}
}
else
{
//----------------------------------------------------------------------
// normal use, in production
//----------------------------------------------------------------------
p = GB_calloc_helper (&size, Context) ;
}
//--------------------------------------------------------------------------
// return result
//--------------------------------------------------------------------------
(*size_allocated) = (p == NULL) ? 0 : size ;
ASSERT (GB_IMPLIES (p != NULL, size == GB_Global_memtable_size (p))) ;
return (p) ;
}
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