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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright (c) 1993-1998 by Sun Microsystems, Inc.
     24  * All rights reserved.
     25  */
     26 
     27 #ifndef _SYS_SEMAPHORE_H
     28 #define	_SYS_SEMAPHORE_H
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 /*
     33  * Public interface to semaphores.  See semaphore(9F) for details.
     34  */
     35 
     36 #ifndef	_ASM
     37 
     38 #ifdef _KERNEL
     39 #include <sys/thread.h>
     40 #endif
     41 
     42 #ifdef	__cplusplus
     43 extern "C" {
     44 #endif
     45 
     46 typedef enum {
     47 	SEMA_DEFAULT,
     48 	SEMA_DRIVER
     49 } ksema_type_t;
     50 
     51 typedef struct _ksema {
     52 	void	* _opaque[2];	/* 2 words on 4 byte alignment */
     53 } ksema_t;
     54 
     55 #if defined(_KERNEL)
     56 
     57 #define	SEMA_HELD(x)		(sema_held((x)))
     58 
     59 extern	void	sema_init(ksema_t *, uint32_t, char *, ksema_type_t, void *);
     60 extern	void	sema_destroy(ksema_t *);
     61 extern	void	sema_p(ksema_t *);
     62 extern	int	sema_p_sig(ksema_t *);
     63 extern	void	sema_v(ksema_t *);
     64 extern	int	sema_tryp(ksema_t *);
     65 extern	int	sema_held(ksema_t *);
     66 
     67 #endif	/* defined(_KERNEL) */
     68 
     69 #ifdef	__cplusplus
     70 }
     71 #endif
     72 
     73 #endif	/* _ASM */
     74 
     75 #endif	/* _SYS_SEMAPHORE_H */
     76