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cpg_overview(8) [centos man page]

CPG_OVERVIEW(8) 				    Corosync Cluster Engine Programmer's Manual 				   CPG_OVERVIEW(8)

cpg_overview - CPG library overview OVERVIEW
The CPG library is delivered with the corosync project. This library is used to create distributed applications that operate properly dur- ing cluster partitions, merges, and faults. The library provides a mechanism to: * handle abstraction for multiple instances of a CPG library in one application * join one or more groups * leave one or more groups * Deliver messages to members of that group * Deliver configuration changes * Iterate members of groups SECURITY
If encryption is enabled in corosync.conf, the CPG library will encrypt and authenticate message contents. Applications must run as the ais user to be validated by corosync on IPC connection, otherwise they will be unable to access the corosync services. 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_model_initialize(3), cpg_membership_get(3), cpg_zcb_alloc(3), cpg_zcb_free(3), cpg_zcb_mcast_joined(3), cpg_context_get(3), cpg_con- text_set(3), cpg_local_get(3), cpg_iteration_initialize(3), cpg_iteration_next(3), cpg_iteration_finalize(3) corosync Man Page 2009-4-15 CPG_OVERVIEW(8)

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CPG_ZCB_MCAST_JOINED(3) 			    Corosync Cluster Engine Programmer's Manual 			   CPG_ZCB_MCAST_JOINED(3)

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_guarantee_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 sub- scribed 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 CS_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) 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 inturrupted by a signal CS_ERR_NOT_SUPPORTED The requested protocol/functuality not supported CS_ERR_MESSAGE_ERROR Incorrect auth message received CS_ERR_NO_MEMORY Not enough memory to completed the requested task corosync Man Page 3004-08-31 CPG_ZCB_MCAST_JOINED(3)
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