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#ifndef	__KERNEL__TOID_H__
#define	__KERNEL__TOID_H__

/*
 * This internal header file is intended as the sole point of definition for
 * the DDI/DKI data type 'toid_t'. This type is used as a handle (or 'cookie')
 * for timeout events so that they can be cancelled after being scheduled. The
 * format of the handle data is opaque.
 *
 * Handles are never explicitly released in the DDI/DKI, so using a pointer to
 * an event cell may not be a good idea (that's the theory; in practice, most
 * clients of the DDI/DKI timeout system take care not to use a timeout handle
 * once the timeout has run).
 *
 * Since clients need to pass these items as parameters and assign them to
 * variables, a pointer to an incomplete type would be a natural
 * representation. However, since a pointer is inappropriate here, we use a
 * large scalar type. Clients are cautioned not to perform any operation other
 * than assignment on such items, however.
 */

typedef	unsigned long	toid_t;


/*
 * The maximum-value defined below can't be used without <limits.h>, but we
 * define it here because it depends critically on the type of toid_t.
 */

#define	TOID_MAX	ULONG_MAX

#endif	/* ! defined (__KERNEL__TOID_H__) */

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