qb_atomic_pointer_compare_and_exchange - Compares oldval with the pointer pointed to by atomic and if

       Copyright (C) 2003 Sebastian Wilhelmi

LIBQB                                              2023-07-21          QB_ATOMIC_POINTER_COMPARE_AND_EXCHANGE(3)

       Also acts as a memory barrier.

       qb_atomic_pointer_compare_and_exchange  -  Compares  oldval  with the pointer pointed to by atomic and if
       they are equal, atomically exchanges *atomic with newval.

atomicapointertoavoid*oldvaltheassumedoldvalueof*atomicnewvalthenewvalueof*atomic

       QB_TRUE if atomic was equal oldval, else QB_FALSE.

qb_atomic_int_set(3), qb_atomic_int_compare_and_exchange(3), qb_atomic_int_get(3), qb_atomic_int_add(3),
       qb_atomic_init(3), qb_atomic_pointer_get(3), qb_atomic_int_exchange_and_add(3), qb_atomic_pointer_set(3)

#include<qb/qbatomic.h>int32_tqb_atomic_pointer_compare_and_exchange(
           volatilevoid*QB_GNUC_MAY_ALIAS*atomic,  /* a pointer to a void* */
           void*oldval,  /* the assumed old value of *atomic */
           void*newval   /* the new value of *atomic*/
       );