vlShmQueue.h File Reference

This file contains the declaration of DtShmMsgQueueManager. More...

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Classes
struct	Dt_Q_Elmt_Hdr
struct	Dt_Msg_Queue_Element
struct	Dt_Q_Hdr
struct	Dt_Shm_Msg_Queue
class	DtShmMsgQueueManager

Macros
#define	DT_QCONTROL_VALID   0
	BEFORE sys/types.h because of concurrent size_t.
#define	DT_QCONTROL_DEAD_SPACE   1
#define	DT_QCONTROL_END   2
#define	DtSMQFrontLockSem   0
#define	DtSMQPacketCountSem   1
#define	DtSMQByteCountSem   0
	This is a real hack.
#define	DtCsSemaphoresUsed   2
#define	DtSMQDontGoYet   0
#define	DtSMQIAmGoingAway   1
#define	DtSMQYouMustGoAway   2
#define	DtSMQExternal   0
#define	DtSMQInternal   1

Typedefs
typedef struct Dt_Q_Elmt_Hdr	DtQueueElementHdr
typedef struct Dt_Msg_Queue_Element	DtMsgQueueElement
typedef struct Dt_Q_Hdr	DtShmQueueHdr
typedef struct Dt_Shm_Msg_Queue	DtShmMsgQueue

Detailed Description

This file contains the declaration of DtShmMsgQueueManager.

Macro Definition Documentation

#define DT_QCONTROL_DEAD_SPACE   1

#define DT_QCONTROL_END   2

#define DT_QCONTROL_VALID   0

BEFORE sys/types.h because of concurrent size_t.

These are used for the control flag in the header.

#define DtCsSemaphoresUsed   2

#define DtSMQByteCountSem   0

This is a real hack.

Front Lock Sem is used for drop oldest mode, while Byte Count Sem is used for blocking writes. Since these are mutually exclusive, we can reuse the same semaphore, which is a 50% savings on semaphore usage, which is limited to 60 by default on most system.

#define DtSMQDontGoYet   0

#define DtSMQExternal   0

#define DtSMQFrontLockSem   0

#define DtSMQIAmGoingAway   1

#define DtSMQInternal   1

#define DtSMQPacketCountSem   1

#define DtSMQYouMustGoAway   2

Typedef Documentation

typedef struct Dt_Msg_Queue_Element DtMsgQueueElement

typedef struct Dt_Q_Elmt_Hdr DtQueueElementHdr

typedef struct Dt_Shm_Msg_Queue DtShmMsgQueue

typedef struct Dt_Q_Hdr DtShmQueueHdr