RSM_MEMSEG_IMPORT_OPEN_BARRIER(3RSM) Remote Shared Memory Library Functions
NAME
rsm_memseg_import_open_barrier, rsm_memseg_import_order_barrier,
rsm_memseg_import_close_barrier - remote memory access error
detection functions
SYNOPSIS
cc [
flag... ]
file... -lrsm [
library... ]
#include <rsmapi.h>
int rsm_memseg_import_open_barrier(
rsmapi_barrier_t *barrier);
int rsm_memseg_import_order_barrier(
rsmapi_barrier_t *barrier);
int rsm_memseg_import_close_barrier(
rsmapi_barrier_t *barrier);
DESCRIPTION
The
rsm_memseg_import_open_barrier() and
rsm_memseg_import_close_barrier() functions provide a means of remote
memory access error detection when the barrier mode is set to
RSM_BARRIER_MODE_EXPLICIT. Open and close barrier operations define a
span-of-time interval for error detection. A successful close barrier
guarantees that remote memory access covered between the open barrier
and close barrier have completed successfully. Any individual
failures which may have occurred between the open barrier and close
barrier occur without any notification and the failure is not
reported until the close barrier.
The
rsm_memseg_import_order_barrier() function imposes the order-of-
write completion whereby, with an order barrier, the write operations
issued before the order barrier are all completed before the
operations after the order barrier. Effectively, with the order
barrier call, all writes within one barrier scope are ordered with
respect to those in another barrier scope.
RETURN VALUES
Upon successful completion, these functions return 0. Otherwise, an
error value is returned to indicate the error.
ERRORS
The
rsm_memseg_import_open_barrier(),
rsm_memseg_import_order_barrier(), and
rsm_memseg_import_close_barrier() functions can return the following
errors:
RSMERR_BAD_SEG_HNDL Invalid segment handle
RSMERR_BAD_BARRIER_PTR Invalid barrier pointer.
The
rsm_memseg_close_barrier() and
rsm_memseg_order_barrier() functions can return the following errors:
RSMERR_BARRIER_UNINITIALIZED Barrier not initialized.
RSMERR_BARRIER_NOT_OPENED Barrier not opened.
RSMERR_BARRIER_FAILURE Memory access error.
RSMERR_CONN_ABORTED Connection aborted.
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Evolving |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+
SEE ALSO
rsm_memseg_import_init_barrier(3RSM),
rsm_memseg_import_set_mode(3RSM),
attributes(7) April 9, 2016
RSM_MEMSEG_IMPORT_OPEN_BARRIER(3RSM)
