xref: /titanic_51/usr/src/uts/common/sys/semaphore.h (revision 37714ae43602c675f9dc59b070bfdf9fa702872c)
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