9.26 ATOMIC_CAS — Atomic compare and swap
- Description:
-
ATOMIC_CAS compares the variable ATOM with the value of COMPARE; if the value is the same, ATOM is set to the value of NEW. Additionally, OLD is set to the value of ATOM that was used for the comparison. When STAT is present and the invokation was successful, it is assigned the value 0. If it is present and the invokation has failed, it is assigned a positive value; in particular, for a coindexed ATOM, if the remote image has stopped, it is assigned the value of ISO_FORTRAN_ENV's STAT_STOPPED_IMAGE and if the remote image has failed, the value STAT_FAILED_IMAGE.
- Standard:
- TS 18508 or later
- Class:
- Atomic subroutine
- Syntax:
-
CALL ATOMIC_CAS (ATOM, OLD, COMPARE, NEW [, ST
