gno/include/sys/ports.h

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1997-02-28 04:42:19 +00:00
/*
* Ports IPC
*
* This file is non-BSD.
*/
#ifndef _SYS_PORTS_H_
#define _SYS_PORTS_H_
#ifdef KERNEL
#define NPORTS 30 /* maximum number of ports */
#define MAXMSGS 100 /* maximum messages on all ports*/
#define PTFREE 1 /* port is free */
#define PTLIMBO 2 /* port is being deleted/reset */
#define PTALLOC 3 /* port is allocated */
#define PTEMPTY -1 /* initial semaphore entries */
#define PTUNNAMED NULL /* port has not been bound */
struct ptnode { /* node on list of message ptrs */
long int ptmsg; /* a one-word message */
struct ptnode *ptnext; /* address of next node on list */
};
struct pt { /* entry in the port table */
int ptstate; /* port state (FREE/LIMBO/ALLOC)*/
char *ptname; /* name bound to port */
int ptssem; /* sender semaphore */
int ptrsem; /* receiver semaphore */
int ptmaxcnt; /* max messages to be queued */
int ptseq; /* sequence changed at creation */
struct ptnode *pthead; /* list of message pointers */
struct ptnode *pttail; /* tail of message list */
};
extern struct ptnode *ptfree; /* list of free nodes */
extern struct pt ports[]; /* port table */
extern int ptnextp; /* next port to examine when */
/* looking for a free one */
#define isbadport(portid) ( (portid) < 0 || (portid)>=NPORTS )
#endif /* KERNEL */
#ifndef _SYS_CDEFS_H_
#include <sys/cdefs.h>
#endif
int pcreate __P((int count));
int psend __P((int portid, long msg));
long preceive __P((int portid));
int pdelete __P((int portid, int (*dispose)(long)));
int preset __P((int portid, int (*dispose)(long)));
int pbind __P((int portid, const char *name));
int pgetport __P((const char *name));
int pgetcount __P((int portid));
#endif /* _SYS_PORTS_H_ */