arqprotocol_rar protocol.txt

ARQ协议实现 c#ARQ协议实现 c#ARQ协议实现 c#

ARQprotocol.rar protocol.hwww.pudn.com > ARQprotocol.rar > protocol.h

#define MAX_PKT 4 /* determines packet size in bytes */ 

typedef enum {false, true} boolean; /* boolean type */ 
typedef unsigned int seq_nr; /* sequence or ack numbers */ 
typedef struct {unsigned char data[MAX_PKT];} packet; /* packet definition */ 
typedef enum {data, ack, nak} frame_kind; /* frame_kind definition */ 

typedef struct { /* frames are transported in this layer */ 
frame_kind kind; /* what kind of a frame is it? */ 
seq_nr seq; /* sequence number */ 
seq_nr ack; /* acknowledgement number */ 
packet info; /* the network layer packet */ 
} frame; 

/* Wait for an event to happen; return its type in event. */ 
void wait_for_event(event_type *event); 

/* Fetch a packet from the network layer for transmission on the channel. */ 
void from_network_layer(packet *p); 

/* Deliver information from an inbound frame to the network layer. */ 
void to_network_layer(packet *p); 

/* Go get an inbound frame from the physical layer and copy it to r. */ 
void from_physical_layer(frame *r); 

/* Pass the frame to the physical layer for transmission. */ 
void to_physical_layer(frame *s); 

/* Start the clock running and enable the timeout event. */ 
void start_timer(seq_nr k); 

/* Stop the clock and disable the timeout event. */ 
void stop_timer(seq_nr k); 

/* Start an auxiliary timer and enable the ack_timeout event. */ 
void start_ack_timer(void); 

/* Stop the auxiliary timer and disable the ack_timeout event. */ 
void stop_ack_timer(void); 

/* Allow the network layer to cause a network_layer_ready event. */ 
void enable_network_layer(void); 

/* Forbid the network layer from causing a network_layer_ready event. */ 
void disable_network_layer(void); 

/* Macro inc is expanded in-line: Increment k circularly. */ 
#define inc(k) if (k < MAX_SEQ) k = k + 1; else k = 0