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
processors 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
actually the AGREED guarantee.
EVS_GUARANTEE_AGREED
All processors must agree on the order of delivery. If a
message 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
argument.
RETURN VALUE
This call returns the EVS_OK value if successful, otherwise an error is
returned.
ERRORS
The errors are undocumented.
SEE ALSO
evs_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)