xref: /illumos-gate/usr/src/uts/common/sys/semaphore.h (revision 2c5ec7a875dcd76853e6618614e990f1e8cdd56d)
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 /*
31  * Public interface to semaphores.  See semaphore(9F) for details.
32  */
33 
34 #ifndef	_ASM
35 
36 #ifdef _KERNEL
37 #include <sys/thread.h>
38 #endif
39 
40 #ifdef	__cplusplus
41 extern "C" {
42 #endif
43 
44 typedef enum {
45 	SEMA_DEFAULT,
46 	SEMA_DRIVER
47 } ksema_type_t;
48 
49 typedef struct _ksema {
50 	void	* _opaque[2];	/* 2 words on 4 byte alignment */
51 } ksema_t;
52 
53 #if defined(_KERNEL)
54 
55 #define	SEMA_HELD(x)		(sema_held((x)))
56 
57 extern	void	sema_init(ksema_t *, uint32_t, char *, ksema_type_t, void *);
58 extern	void	sema_destroy(ksema_t *);
59 extern	void	sema_p(ksema_t *);
60 extern	int	sema_p_sig(ksema_t *);
61 extern	void	sema_v(ksema_t *);
62 extern	int	sema_tryp(ksema_t *);
63 extern	int	sema_held(ksema_t *);
64 
65 #endif	/* defined(_KERNEL) */
66 
67 #ifdef	__cplusplus
68 }
69 #endif
70 
71 #endif	/* _ASM */
72 
73 #endif	/* _SYS_SEMAPHORE_H */
74