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Vector Packet Processing
message_queue.h File Reference

Unidirectional shared-memory multi-ring message queue. More...

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Data Structures

struct  svm_msg_q_ring_
 
struct  svm_msg_q_
 
struct  svm_msg_q_ring_cfg_
 
struct  svm_msg_q_cfg_
 
union  svm_msg_q_msg_t
 

Typedefs

typedef struct svm_msg_q_ring_ svm_msg_q_ring_t
 
typedef struct svm_msg_q_ svm_msg_q_t
 
typedef struct svm_msg_q_ring_cfg_ svm_msg_q_ring_cfg_t
 
typedef struct svm_msg_q_cfg_ svm_msg_q_cfg_t
 

Functions

svm_msg_q_tsvm_msg_q_alloc (svm_msg_q_cfg_t *cfg)
 Allocate message queue. More...
 
void svm_msg_q_free (svm_msg_q_t *mq)
 Free message queue. More...
 
svm_msg_q_msg_t svm_msg_q_alloc_msg (svm_msg_q_t *mq, u32 nbytes)
 Allocate message buffer. More...
 
void svm_msg_q_free_msg (svm_msg_q_t *mq, svm_msg_q_msg_t *msg)
 Free message buffer. More...
 
int svm_msg_q_add (svm_msg_q_t *mq, svm_msg_q_msg_t msg, int nowait)
 Producer enqueue one message to queue. More...
 
int svm_msg_q_sub (svm_msg_q_t *mq, svm_msg_q_msg_t *msg, svm_q_conditional_wait_t cond, u32 time)
 Consumer dequeue one message from queue. More...
 
void * svm_msg_q_msg_data (svm_msg_q_t *mq, svm_msg_q_msg_t *msg)
 Get data for message in queu. More...
 

Detailed Description

Unidirectional shared-memory multi-ring message queue.

Definition in file message_queue.h.

Typedef Documentation

typedef struct svm_msg_q_ svm_msg_q_t

Function Documentation

int svm_msg_q_add ( svm_msg_q_t mq,
svm_msg_q_msg_t  msg,
int  nowait 
)

Producer enqueue one message to queue.

Prior to calling this, the producer should've obtained a message buffer from one of the rings by calling svm_msg_q_alloc_msg.

Parameters
mqmessage queue
msgmessage (pointer to ring position) to be enqueued
nowaitflag to indicate if request is blocking or not
Returns
success status

Definition at line 143 of file message_queue.c.

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svm_msg_q_t* svm_msg_q_alloc ( svm_msg_q_cfg_t cfg)

Allocate message queue.

Allocates a message queue on the heap. Based on the configuration options, apart from the message queue this also allocates (one or multiple) shared-memory rings for the messages.

Parameters
cfgconfiguration options: queue len, consumer pid, ring configs
Returns
message queue

Definition at line 20 of file message_queue.c.

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svm_msg_q_msg_t svm_msg_q_alloc_msg ( svm_msg_q_t mq,
u32  nbytes 
)

Allocate message buffer.

Message is allocated on the first available ring capable of holding the requested number of bytes.

Parameters
mqmessage queue
nbytesnumber of bytes needed for message
Returns
message structure pointing to the ring and position allocated

Definition at line 66 of file message_queue.c.

void svm_msg_q_free ( svm_msg_q_t mq)

Free message queue.

Parameters
mqmessage queue to be freed

Definition at line 53 of file message_queue.c.

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void svm_msg_q_free_msg ( svm_msg_q_t mq,
svm_msg_q_msg_t msg 
)

Free message buffer.

Marks message buffer on ring as free.

Parameters
mqmessage queue
msgmessage to be freed

Definition at line 105 of file message_queue.c.

void* svm_msg_q_msg_data ( svm_msg_q_t mq,
svm_msg_q_msg_t msg 
)

Get data for message in queu.

Parameters
mqmessage queue
msgmessage for which the data is requested
Returns
pointer to data

Definition at line 98 of file message_queue.c.

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int svm_msg_q_sub ( svm_msg_q_t mq,
svm_msg_q_msg_t msg,
svm_q_conditional_wait_t  cond,
u32  time 
)

Consumer dequeue one message from queue.

This returns the message pointing to the data in the message rings. The consumer is expected to call svm_msg_q_free_msg once it finishes processing/copies the message data.

Parameters
mqmessage queue
msgpointer to structure where message is to be received
condflag that indicates if request should block or not
Returns
success status

Definition at line 150 of file message_queue.c.

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