NAME

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

SYNOPSIS

       #include <qb/qbatomic.h>

       int32_t qb_atomic_int_compare_and_exchange(
           volatile int32_t QB_GNUC_MAY_ALIAS   *atomic,  /* a pointer to an integer */
           int32_t                               oldval,  /* the assumed old value of *atomic */
           int32_t                               newval   /* the new value of *atomic*/
       );

PARAMS

       atomic a pointer to an integer

       oldval the assumed old value of *atomic

       newval the new value of *atomic

DESCRIPTION

       Also acts as a memory barrier.

RETURN VALUE

       QB_TRUE, if *atomic was equal oldval. QB_FALSE otherwise.

SEE ALSO

       qb_atomic_int_set(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_compare_and_exchange(3), qb_atomic_pointer_set(3)

COPYRIGHT

       Copyright (C) 2003 Sebastian Wilhelmi