NAME

       rpma_atomic_write -- initiate the atomic 8 bytes write operation

SYNOPSIS

             #include <librpma.h>

             struct rpma_conn;
             struct rpma_mr_remote;
             int rpma_atomic_write(struct rpma_conn *conn,
                             struct rpma_mr_remote *dst, size_t dst_offset,
                             const char src[8], int flags, const void *op_context);

DESCRIPTION

       rpma_atomic_write()  initiates  the atomic 8 bytes write operation (transferring data from
       the local memory to the remote memory). The atomic  write  operation  allows  transferring
       exactly 8 bytes of data and storing them atomically in the remote memory.

       The attribute flags set the completion notification indicator:

       •  RPMA_F_COMPLETION_ON_ERROR - generate the completion on error

       •  RPMA_F_COMPLETION_ALWAYS  -  generate  the  completion  regardless  of  result  of  the
          operation.

       op_context is returned in the wr_id field of the completion (struct ibv_wc).

RETURN VALUE

       The rpma_atomic_write() function returns 0 on success or a negative error code on failure.

ERRORS

       rpma_atomic_write() can fail with the following errors:

       •  RPMA_E_INVAL - conn, dst or src is NULL

       •  RPMA_E_INVAL - dst_offset is not aligned to 8 bytes

       •  RPMA_E_INVAL - flags are not set (flags == 0)

       •  RPMA_E_PROVIDER - ibv_post_send(3) failed

SEE ALSO

       rpma_conn_req_connect(3),  rpma_mr_reg(3),  rpma_mr_remote_from_descriptor(3),  librpma(7)
       and https://pmem.io/rpma/