GLibatomic_int_add

since: 2.4

gint
g_atomic_int_add (
  volatile gint* atomic,
  gint val
)

Atomically adds val to the value of atomic.

Think of this operation as an atomic version of { tmp = *atomic; *atomic += val; return tmp; }.

This call acts as a full compiler and hardware memory barrier.

Before version 2.30, this function did not return a value (but g_atomic_int_exchange_and_add() did, and had the same meaning).

While atomic has a volatile qualifier, this is a historical artifact and the pointer passed to it should not be volatile.

Available since: 2.4

atomic

Type: volatile gint*

A pointer to a #gint or #guint.

The data is owned by the caller of the function.

val

Type: gint

The value to add.

Type: gint

The value of atomic before the add, signed.