# 18.2.213. shmem_udcflush

shmem_clear_cache_inv(3), shmem_set_cache_inv(3), shmem_set_cache_line_inv(3), shmem_udcflush(3), shmem_udcflush_line(3) - Controls data cache utilities

## 18.2.213.1. SYNOPSIS

C or C++:

    #include <mpp/shmem.h>

    void shmem_clear_cache_inv(void)
    void shmem_clear_cache_line_inv(void *target)
    void shmem_set_cache_inv(void)
    void shmem_set_cache_line_inv(void *target)
    void shmem_udcflush(void)
    void shmem_udcflush_line(void *target)

Fortran:

    INCLUDE "mpp/shmem.fh"

    CALL SHMEM_CLEAR_CACHE_INV
    CALL SHMEM_CLEAR_CACHE_LINE_INV(target)
    CALL SHMEM_SET_CACHE_INV
    CALL SHMEM_SET_CACHE_LINE_INV(target)

    CALL SHMEM_UDCFLUSH
    CALL SHMEM_UDCFLUSH_LINE(target)

## 18.2.213.2. DESCRIPTION

The following argument is passed to the cache line control routines:

target

  A data object that is local to the processing element (PE). target can be of any noncharacter type. If you are using Fortran, it can be of any kind.

shmem_clear_cache_inv disables automatic cache coherency mode previously enabled by shmem_set_cache_inv or shmem_set_cache_line_inv.

shmem_clear_cache_line_inv disables automatic cache coherency mode for the cache line associated with the address of target only.

shmem_set_cache_inv enables the OpenSHMEM API to automatically decide the best strategy for cache coherency.

shmem_set_cache_line_inv enables automatic cache coherency mode for the cache line associated with the address of target only.

shmem_clear_cache_inv disables automatic cache coherency mode previously enabled by shmem_set_cache_inv or shmem_set_cache_line_inv.

shmem_udcflush makes the entire user data cache coherent.

shmem_udcflush_line makes coherent the cache line that corresponds with the address specified by target.

## 18.2.213.3. NOTES

These routines have been retained for improved backward compatibility with legacy architectures.

See also

intro_shmem(3) shmem_put(3) shmem_swap(3)