GLib.atomic_int_compare_and_exchange_full
Description: Reference for GLib.atomic_int_compare_and_exchange_full

### Function

# GLibatomic_int_compare_and_exchange_full

since: 2.74

#### Declaration [src]

    gboolean
    g_atomic_int_compare_and_exchange_full (
      gint* atomic,
      gint oldval,
      gint newval,
      gint* preval
    )

#### Description [src]

Compares `atomic` to `oldval` and, if equal, sets it to `newval`. If `atomic` was not equal to `oldval` then no change occurs. In any case the value of `atomic` before this operation is stored in `preval`.

This compare and exchange is done atomically.

Think of this operation as an atomic version of `{ *preval = *atomic; if (*atomic == oldval) { *atomic = newval; return TRUE; } else return FALSE; }`.

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

See also g_atomic_int_compare_and_exchange().

Available since: 2.74

#### Parameters

`atomic`

  Type: `gint*`

  A pointer to a #gint or #guint.

  The argument can be `NULL`.
  The data is owned by the caller of the function.

`oldval`

  Type: `gint`

  The value to compare with.

`newval`

  Type: `gint`

  The value to conditionally replace with.

`preval`

  Type: `gint*`

  The contents of `atomic` before this operation.

  The argument will be set by the function.

#### Return value

Type: `gboolean`

`TRUE` if the exchange took place.