Desktop/xinu_mips-1.0.2.tar/xinu_mips-1.0.2/include/semaphore.h

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/* Embedded XINU, Copyright (C) 2007.  All rights reserved. */

#ifndef _SEM_H_
#define _SEM_H_

#include <kernel.h>
#include <queue.h>     
/* Semaphore state definitions */
#define SFREE 0x01     
#define SUSED 0x02     
/* type definition of "semaphore" */
typedef ulong semaphore;

/* Semaphore table entry */
struct sentry
{
        char  state;       
        short count;       
        queue queue;       
};

extern struct sentry semtab[];

#define isbadsem(s) (((ushort)(s) >= NSEM) || (SFREE == semtab[s].state))

/* Semaphore function declarations */
syscall   wait(semaphore);
syscall   signal(semaphore);
syscall   signaln(semaphore, short);
semaphore newsem(short);
syscall   freesem(semaphore);
syscall   scount(semaphore);

#endif

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