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/