void bli_pool_alloc_block( siz_t block_size,
siz_t align_size,
pblk_t* block )
{
void* buf_sys;
void* buf_align;
// Allocate the block. We add the alignment size to ensure we will
// have enough usable space after alignment.
buf_sys = bli_malloc( block_size + align_size );
buf_align = buf_sys;
// Advance the pointer to achieve the necessary alignment, if it is not
// already aligned.
if ( bli_is_unaligned_to( buf_sys, align_size ) )
{
// C99's stdint.h guarantees that a void* can be safely cast to a
// uintptr_t and then back to a void*, hence the casting of buf_sys
// and align_size to uintptr_t. buf_align is initially cast to char*
// to allow pointer arithmetic in units of bytes, and then advanced
// to the next nearest alignment boundary, and finally cast back to
// void* before being stored. Notice that the arithmetic works even
// if the alignment value is not a power of two.
buf_align = ( void* )( ( char* )buf_align +
( ( uintptr_t )align_size -
( uintptr_t )buf_sys %
( uintptr_t )align_size )
);
}
// Save the results in the pblk_t structure.
bli_pblk_set_buf_sys( buf_sys, block );
bli_pblk_set_buf_align( buf_align, block );
}
void bli_pool_alloc_block( siz_t block_size,
siz_t align_size,
pblk_t* block )
{
void* buf_sys;
void* buf_align;
// Allocate the block. We add the alignment size to ensure we will
// have enough usable space after alignment.
buf_sys = bli_malloc( block_size + align_size );
buf_align = buf_sys;
// Advance the pointer to achieve the necessary alignment, if it
// is not already aligned.
if ( bli_is_unaligned_to( ( uintptr_t )buf_sys, ( uintptr_t )align_size ) )
{
// Notice that this works even if the alignment is not a power of two.
buf_align += ( ( uintptr_t )align_size -
( ( uintptr_t )buf_sys % align_size ) );
}
// Save the results in the pblk_t structure.
bli_pblk_set_buf_sys( buf_sys, block );
bli_pblk_set_buf_align( buf_align, block );
}