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calloc

From cppreference.com
< c‎ | memory
 
C
 
Dynamic memory management
 
Defined in header <stdlib.h>
void* calloc( size_t num, size_t size );

Allocates memory for an array of num objects of size and initializes all bytes in the allocated storage to zero.

If allocation succeeds, returns a pointer to the lowest (first) byte in the allocated memory block that is suitably aligned for any object type with fundamental alignment.

If size is zero, the behavior is implementation defined (null pointer may be returned, or some non-null pointer may be returned that may not be used to access storage).

calloc is thread-safe: it behaves as though only accessing the memory locations visible through its argument, and not any static storage.

A previous call to free, free_sized, and free_aligned_sized(since C23) or realloc that deallocates a region of memory synchronizes-with a call to calloc that allocates the same or a part of the same region of memory. This synchronization occurs after any access to the memory by the deallocating function and before any access to the memory by calloc. There is a single total order of all allocation and deallocation functions operating on each particular region of memory.

(since C11)

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