hust_hash.h

实现基于ip2022的MPEG2 TS的IP组播接收

/*
 * $Id: hash.h,v 1.3 2000/03/01 03:21:02 evangemh Exp $
 */

#ifndef HASH_H
#define HASH_H

////#include <pthread.h>


/* structure for hashtable entry */
struct htent {
  unsigned long int	hte_key;	/* key; may be pointer	*/
  void	       		*hte_object;	/* pointer to object	*/
  struct htent		*hte_chain;	/* next htent in bucket	*/
};

/* structure for hashtable */
struct ht {
  struct htent		**ht_entries;	/* array of buckets		*/
  int (* ht_hashfcn)(unsigned long int, u8_t);/* ptr to hash function		*/
  int (* ht_cmpfcn)(unsigned long int, unsigned long int);
					/* ptr to comparison function;
					   should return 0 on equal.	*/
///  void (* ht_destroykeyfcn)(unsigned long int);
					/* ptr to function to destroy
					   or free key			*/
/// void (* ht_destroyobjectfcn)(void *);
					/* ptr to function to destroy
					   or free object		*/
					////这里即是rtpdestroystream函数。   
  u8_t			ht_destroy;
  u8_t			ht_size;	/* number of buckets		*/
  					////规定一个哈希表中可含有的最多的bulks
  					////这里他的值为RTP_SSRCHTSZ(27)
  int			ht_count;	/* number of items in table	*/

  ///////pthread_mutex_t	ht_writepend;	/* mutexes and counters to	*/
  ///////pthread_mutex_t 	ht_readblk;	/* implement basic readers	*/
  ///////pthread_mutex_t      	ht_writeblk;	/* writers locking with		*/
  ///////pthread_mutex_t	ht_rdcntmutex;	/* priority given to writers.	*/
  ///////pthread_mutex_t	ht_wrcntmutex;
  int			ht_readcnt;
  int			ht_writecnt;
};

/* API calls */
char*                   htget(struct ht *, unsigned long int);
struct ht*		htnew(u8_t, int(*)(unsigned long int, u8_t), int(*)(unsigned long int, unsigned long int), u8_t);
int			htadd(struct ht *, unsigned long int, void *);
int			htdel(struct ht *, unsigned long int);
int			htdestroy(struct ht *);
int			htcount(struct ht *);
struct htent		**htenum(struct ht *);

/* Internal calls */
struct htent            *htgetent(struct ht *, unsigned long int);
void htreaderbegin(struct ht *);
void htreaderend(struct ht *);
void htwriterbegin(struct ht *);
void htwriterend(struct ht *);

/* Hash and comparison functions */
int			hashstring(unsigned long int, u8_t);
int                     hashunsignedint(unsigned long int, u8_t);
int			unsignedinteq(unsigned long int, unsigned long int);

#endif