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cpg_zcb_alloc(3) [centos man page]

CPG_ZCB_ALLOC(2009-04-15)												 CPG_ZCB_ALLOC(2009-04-15)

NAME
cpg_zcb_alloc - Allocates a zero copy buffer #include <corosync/cpg.h> int cpg_zcb_alloc(cpg_handle_t handle, size_t size, void **buffer); DESCRIPTION
The cpg_zcb_alloc function will allocate a zero copy buffer for use with the cpg_zcb_mcast_joined(3) funtion. This buffer should not be used in another thread while a cpg_zcb_mcast_joined operation is taking place on the buffer. The buffer is allocated via operating system mechanisms to avoid copying in the IPC layer. The argument handle describes the handle on which the buffer will be allocated. The argument size requests a buffer of size be allocated. The buffer argument is set to the buffer address that is allocated by this operatoin. 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 Cluster Engine Programmer's Manual corosync Man Page CPG_ZCB_ALLOC(2009-04-15)

Check Out this Related Man Page

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

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_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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