Sanchayan Maity
8501cb7ed8
This patch adds functionality to request an asynchronous notification if some other process has send a message to it. We currently send a SIGALRM to avoid any changes to core infrastructure of signal handling. Ideally we should implement a separate signal for this. Currently there is an obvious disadvantage of not being able to use SIGALRM with alarm, if we are using this functionality.
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
#ifndef MQUEUE_H
|
|
#define MQUEUE_H
|
|
|
|
/*
|
|
* This header file defines constants and function declarations used for
|
|
* MINIX interprocess message queues. These are used primarily in file
|
|
* mqueue.c
|
|
*/
|
|
|
|
#include <minix/type.h>
|
|
|
|
/*
|
|
* This provides a maximum limit beyond which we do not allow changing
|
|
* number of queues or number of messages in queue.
|
|
*/
|
|
#define MAX_LIMIT 256
|
|
#define MIN_LIMIT 16
|
|
|
|
#define MAX_RECEIVERS 4
|
|
#define MAX_MESSAGES MAX_LIMIT
|
|
#define MAX_QUEUES MAX_LIMIT
|
|
#define MAX_PAYLOAD 32
|
|
#define NAME_SIZE 32
|
|
#define DEFAULT_PRIO 0
|
|
|
|
#define EMPTY -1
|
|
#define NOT_EMPTY 1
|
|
|
|
#define MQ_BLOCKING 0
|
|
#define MQ_NON_BLOCKING 1
|
|
|
|
#define NOTIFY_ON 1
|
|
#define NOTIFY_OFF 0
|
|
|
|
typedef int mqd_t;
|
|
|
|
typedef struct message_entity {
|
|
u64_t timestamp;
|
|
char msg[MAX_PAYLOAD];
|
|
endpoint_t src;
|
|
endpoint_t dst[MAX_RECEIVERS];
|
|
unsigned int priority;
|
|
} message_entity;
|
|
|
|
typedef struct messageq {
|
|
char name[NAME_SIZE];
|
|
int num_msgs;
|
|
int num_users;
|
|
message_entity msge[MAX_MESSAGES];
|
|
int msg_slot_empty[MAX_MESSAGES];
|
|
} messageq;
|
|
|
|
typedef struct message_queue {
|
|
int num_queues;
|
|
messageq msg[MAX_QUEUES];
|
|
int queue_slot_empty[MAX_QUEUES];
|
|
} message_queue;
|
|
|
|
int number_of_messages;
|
|
int number_of_queues;
|
|
int mq_blocking;
|
|
int notify;
|
|
|
|
int initialize_message_queues(void);
|
|
int deinitialize_message_queues(void);
|
|
|
|
mqd_t mq_open(const char *name, int oflag);
|
|
int mq_send(mqd_t mqdes, const char *msg_ptr, unsigned int msg_prio, endpoint_t src, endpoint_t dst[]);
|
|
size_t mq_receive(mqd_t mqdes, char *msg_ptr, unsigned int msg_prio, endpoint_t dst);
|
|
int mq_get_attributes(int *no_of_msgs, int *no_of_queues, int *blocking);
|
|
int mq_set_attributes(int no_of_msgs, int no_of_queues, int blocking);
|
|
int mq_close(mqd_t mqdes);
|
|
int mq_notify(int notify_on_off);
|
|
|
|
int clean_message_queue(mqd_t mqdes);
|
|
int message_index_with_highprio(mqd_t mqdes, endpoint_t dst);
|
|
|
|
#endif /* MQUEUE_H */
|