EVS_MCAST_GROUPS(3) Openais Programmer's Manual EVS_MCAST_GROUPS(3)NAME
evs_join - Multicast a message to selected groups
SYNOPSIS
#include <sys/uio.h> #include <openais/evs.h>
int evs_mcast_gruops(evs_handle_t handle, evs_guraantee_t guarantee,
evs_group_t *groups, int group_entries, struct iovec *iovec, int
iov_len);
DESCRIPTION
The evs_mcast_groups(3) function multicasts a message to all the groups
specified in the arguemnt groups. Messages are delivered to all pro‐
cessors in the system that are described by the current configuration.
The argument handle describes a handle created with evs_initialize(3).
The argument guarantee requests a delivery guarantee for the message to
be sent. The evs_guarantee_t type is defined by:
typedef enum {
EVS_TYPE_UNORDERED, /* not implemented */
EVS_TYPE_FIFO, /* same as agreed */
EVS_TYPE_AGREED, /* implemented */
EVS_TYPE_SAFE /* not implemented */
} evs_guarantee_t;
The meanings of the evs_gaurantee_t typedef are:
EVS_GUARANTEE_UNORDERED
Messages are guaranteed to be delivered, but with no particular
order. This mode is unimplemented in the EVS library.
EVS_GUARANTEE_FIFO
Messages are guaranteed to be delivered in first sent first
delivery order from one one. In fact, this guarantee is actu‐
ally the AGREED guarantee.
EVS_GUARANTEE_AGREED
All processors must agree on the order of delivery. If a mes‐
sage is sent from two or more processors at about the same time,
the delivery will occur in the same order to all processors.
EVS_GUARANTEE_SAFE
All processors must agree on the order of delivery. Further all
processors must have a copy of the message before any delivery
takes place. This mode is unimplemented in the EVS library.
The groups argument is of the type evs_group_t which is defined by the
structure:
typedef struct {
char key[32];
} evs_groups_t;
The group_entries argument describes the number of entries in the group
argument.
The iovec argument describes the scatter/gather list which is used to
transmit a message. This is a standard socket structure described by:
struct iovec
{
void *iov_base; /* Pointer to data. */
size_t iov_len; /* Length of data. */
};
The iovlen argument describes the number of entires in the iovec argu‐
ment.
RETURN VALUE
This call returns the EVS_OK value if successful, otherwise an error is
returned.
ERRORS
The errors are undocumented.
SEE ALSOevs_overview(8), evs_initialize(3), evs_finalize(3), evs_fd_get(3),
evs_dispatch(3), evs_leave(3), evs_join(3), evs_mcast_joined(3),
evs_mmembership_get(3)openais Man Page 2004-08-31 EVS_MCAST_GROUPS(3)
