NAME
cpg_mcast_joined - Multicasts to all groups joined to a handle
SYNOPSIS
#include
<sys/uio.h>
#include <corosync/cpg.h>
int cpg_mcast_joined(cpg_handle_t handle, cpg_guarantee_t guarantee, struct iovec *iovec, int iov_len);
DESCRIPTION
The cpg_mcast_joined function will multicast a message to all the processes that have been joined with the cpg_join(3) function 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 iovec argument describes the scatter/gather list which is used to transmit a message. This is a iovec described by:
struct iovec
{
void *iov_base; /* Pointer to data. */
unsigned int iov_len; /* Length of data. */
};
The iov_len argument describes the number of entries in the iovec argument.
RETURN VALUE
This call returns the CS_OK value if successful, otherwise an error is returned.
ERRORS
The errors are undocumented.
SEE ALSO
cpg_overview(3), 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)
CS_ERR_TRY_AGAIN Resource temporarily unavailable
CS_ERR_INVALID_PARAM Invalid argument
CS_ERR_ACCESS Permission denied
CS_ERR_LIBRARY The connection failed
CS_ERR_INTERRUPT System call interrupted by a signal
CS_ERR_NOT_SUPPORTED The requested protocol/functionality not supported
CS_ERR_MESSAGE_ERROR Incorrect auth message received
CS_ERR_NO_MEMORY Not enough memory to complete the requested task