NAME
cpg_mcast_joined - Multicasts a zero copy buffer to all groups joined
to a handle
SYNOPSIS
#include <sys/uio.h> #include <corosync/cpg.h>
int cpg_zcb_mcast_joined(cpg_handle_t handle, cpg_gurantee_t guarantee,
const void *buffer,int msg_len );
DESCRIPTION
The cpg_zcb_mcast_joined function will multicast a zero copy buffer
message to all the processes that have been joined with the cpg_join(3)
funtion for the same group name. Messages that are sent to any of the
groups joined to the parameter handle will be delivered to all
subscribed processes in the system.
The argument guarantee requests a delivery guarantee for the message to
be sent. The cpg_guarantee_t type is defined by:
typedef enum {
CPG_TYPE_UNORDERED, /* not implemented */
CPG_TYPE_FIFO, /* same as agreed */
CPG_TYPE_AGREED, /* implemented */
CPG_TYPE_SAFE /* not implemented */
} cpg_guarantee_t;
The meanings of the cpg_guarantee_t typedef are:
CPG_TYPE_UNORDERED
Messages are guaranteed to be delivered, but with no particular
order. This mode is unimplemented in the CPG library.
CPG_TYPE_FIFO
Messages are guaranteed to be delivered in first sent first
delivery order. In fact, this guarantee is equivalent to the
CPG_TYPE_AGREED guarantee.
CPG_TYPE_AGREED
All processors must agree on the order of delivery. If a
message is sent from two or more processes at about the same
time, the delivery will occur in the same order to all
processes.
CPG_TYPE_SAFE
All processes must agree on the order of delivery. Further all
processes must have a copy of the message before any delivery
takes place. This mode is unimplemented in the CPG library.
The msg argument describes the zero copy buffer which is used to
transmit a message. this buffer must be allocated by cpg_zcb_alloc(3).
The msg_len argument describes the number of bytes to be transmitted in
the zero copy buffer.
RETURN VALUE
This call returns the CPG_OK value if successful, otherwise an error is
returned.
ERRORS
The errors are undocumented.
SEE ALSO
cpg_overview(8), cpg_initialize(3), cpg_finalize(3), cpg_fd_get(3),
cpg_dispatch(3), cpg_join(3), cpg_leave(3), cpg_mcast_joined(3),
cpg_membership_get(3) cpg_zcb_alloc(3) cpg_zcb_free(3)
cpg_zcb_mcast_joined(3) cpg_context_get(3) cpg_context_set(3)
cpg_local_get(3)