__sync_fetch_and_add
Purpose
This function atomically adds the value of __v to the variable that __p points to. The result is stored in the address that is specified by __p.
A full memory barrier is created when this function is invoked.
Prototype
T __sync_fetch_and_add (T* __p, U __v, ...);
Parameters
- __p
- The pointer of a variable to which __v is to be added. The value of this variable is to be changed to the result of the add operation.
- __v
- The variable whose value is to be added to the variable that __p points to.
Return value
The function returns the initial value of the variable that __p points to.
