Description:
block_pool allocates blocks by packing them into buffers, making the
overhead per block virtually zero. Because of this, you cannot resize or
free individual blocks, but you can free the entire block_pool.
The rationale behind block_pool is that talloc uses a lot of bytes per
block (48 on 32-bit, 80 on 64-bit). Nevertheless, talloc is an excellent
tool for C programmers of all ages. Because a block_pool is a talloc
context, it can be useful in talloc-based applications where many small
blocks need to be allocated.
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Example:
#include <ccan/block_pool/block_pool.h>
int main(void) {
struct block_pool *bp = block_pool_new(NULL);
void *buffer = block_pool_alloc(bp, 4096);
char *string = block_pool_strdup(bp, "A string");
int array[] = {0,1,1,2,3,5,8,13,21,34};
int *array_copy = block_pool_memdup(bp, array, sizeof(array));
memset(buffer, 0xff, 4096);
printf("string = %s\n", string);
printf("array_copy[0] == %i\n", array_copy[0]);
block_pool_free(bp);
return 0;
}
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