[apple/xnu.git] / bsd / sys / sem_internal.h

/*
 * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
 * support for mandatory and extensible security protections.  This notice
 * is included in support of clause 2.2 (b) of the Apple Public License,
 * Version 2.0.
 */
/*	$NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $	*/

/*
 * SVID compatible sem_internal.h file
 *
 * Author:  Daniel Boulet
 */
/*
 * John Bellardo modified the implementation for Darwin. 12/2000
 */

#ifndef _SYS_SEM__INTERNALH_
#define _SYS_SEM__INTERNALH_

#include <sys/sem.h>
#include <sys/cdefs.h>


/*
 * This structure is variant for 64 bits because of sem_otime and sem_ctime.
 */

#if __DARWIN_ALIGN_NATURAL
#pragma options align=natural
#endif

struct user_semid_ds {
	struct ipc_perm sem_perm;	/* [XSI] operation permission struct */
	struct sem	*sem_base;	/* 32 bit base ptr for semaphore set */
	unsigned short	sem_nsems;	/* [XSI] number of sems in set */
	user_time_t	sem_otime;	/* [XSI] last operation time */
	__int32_t	sem_pad1;	/* RESERVED: DO NOT USE! */
	user_time_t	sem_ctime;	/* [XSI] last change time */
    					/* Times measured in secs since */
    					/* 00:00:00 GMT, Jan. 1, 1970 */
	__int32_t	sem_pad2;	/* RESERVED: DO NOT USE! */
	__int32_t	sem_pad3[4];	/* RESERVED: DO NOT USE! */
};

union user_semun {
	user_addr_t	buf;		/* buffer for IPC_STAT & IPC_SET */
	user_addr_t	array;		/* array for GETALL & SETALL */
};
typedef union user_semun user_semun_t;

#if __DARWIN_ALIGN_NATURAL
#pragma options align=reset
#endif


/*
 * Kernel implementation stuff
 */
#define SEMVMX	32767		/* semaphore maximum value */
#define SEMAEM	16384		/* adjust on exit max value */

/*
 * Configuration parameters.  SEMMNI, SEMMNS, and SEMMNU are hard limits.
 * The code dynamically allocates enough memory to satisfy the current
 * demand in even increments of SEMMNI_INC, SEMMNS_INC, and SEMMNU_INC.
 * The code will never allocate more than the hard limits.  The *_INC's
 * are defined in the kernel section of the header.
 */
/*
 * Configuration parameters
 */
#ifndef SEMMNS			/* # of semaphores in system */
#define SEMMNS	(1048576/sizeof(struct sem))
#endif				/* no more than 1M of semaphore data */
#ifndef SEMMNI			/* # of semaphore identifiers */
#define SEMMNI	SEMMNS		/* max of 1 for each semaphore */
#endif
#ifndef SEMUME
#define SEMUME	10		/* max # of undo entries per process */
#endif
#ifndef SEMMNU			/* # of undo structures in system */
#define SEMMNU	SEMMNS		/* 1 for each semaphore.  This is quite large */
#endif				/* This should be max 1 for each process */

/* shouldn't need tuning */
#ifndef SEMMAP
#define SEMMAP	30		/* # of entries in semaphore map */
#endif
#ifndef SEMMSL
#define SEMMSL	SEMMNS		/* max # of semaphores per id */
#endif
#ifndef SEMOPM
#define SEMOPM	100		/* max # of operations per semop call */
#endif


/*
 * Undo structure (internal: one per process)
 */
struct sem_undo {
	int 	un_next_idx;	/* index of next active undo structure */
	struct	proc *un_proc;		/* owner of this structure */
	short	un_cnt;			/* # of active entries */
	struct undo {
		short	une_adjval;	/* adjust on exit values */
		short	une_num;	/* semaphore # */
		int	une_id;		/* semid */
		struct undo *une_next;	/* next undo entry */
	} *un_ent;			/* undo entries */
};

/*
 * semaphore info struct (internal; for administrative limits and ipcs)
 */
struct seminfo {
	int	semmap,		/* # of entries in semaphore map */
		semmni,		/* # of semaphore identifiers */
		semmns,		/* # of semaphores in system */
		semmnu,		/* # of undo structures in system */
		semmsl,		/* max # of semaphores per id */
		semopm,		/* max # of operations per semop call */
		semume,		/* max # of undo entries per process */
		semusz,		/* size in bytes of undo structure */
		semvmx,		/* semaphore maximum value */
		semaem;		/* adjust on exit max value */
};
extern struct seminfo	seminfo;

/*
 * Kernel wrapper for the user-level structure
 */
struct semid_kernel {
	struct	user_semid_ds u;
	struct	label *label;	/* MAC framework label */
};


/* internal "mode" bits */
#define	SEM_ALLOC	01000	/* semaphore is allocated */
#define	SEM_DEST	02000	/* semaphore will be destroyed on last detach */

#define SEMMNI_INC	8	/* increment value for semaphore identifiers */
#define SEMMNS_INC	64	/* increment value for semaphores */
#define SEMMNU_INC	32	/* increment value for undo structures */

/*
 * Due to the way semaphore memory is allocated, we have to ensure that
 * SEMUSZ is properly aligned.
 *
 * We are not doing strange semaphore memory allocation anymore, so
 * these macros are no longer needed.
 */

/*
 * #define SEM_ALIGN(bytes) (((bytes) + (sizeof(long) - 1)) & ~(sizeof(long) - 1))
 */

/* actual size of an undo structure */
/*
 * #define SEMUSZ	SEM_ALIGN(offsetof(struct sem_undo, un_ent[SEMUME]))
 */
#define SEMUSZ		sizeof(struct sem_undo)

extern struct semid_kernel	*sema;		/* semaphore id pool */
extern struct sem		*sem_pool;	/* semaphore pool */
/* This is now a struct sem_undo with the new memory allocation 
 * extern int	*semu;		// undo structure pool
 */
extern struct sem_undo	*semu;		/* undo structure pool */

/*
 * Macro to find a particular sem_undo vector
 */
/* Until we can initialize seminfo.semusz to SEMUSZ, we hard code the size macro
 * in SEMU.  This should be fixed when (if) we implement dynamic pool sizes
 *
 * #define SEMU(ix)     ((struct sem_undo *)(((intptr_t)semu)+ix * seminfo.semusz))
 */
/*
 * This macro doesn't work because we are using a staticly allocated array
 * for semu now.
 * #define SEMU(ix)        ((struct sem_undo *)(((intptr_t)semu)+ix * SEMUSZ)) 
 */
#define SEMU(ix)        (&semu[ix])


/*
 * Process sem_undo vectors at proc exit.
 */
void	semexit(struct proc *p);

#endif /* !_SYS_SEM__INTERNALH_ */
Commit	Line	Data
91447636	1	/*
2d21ac55	2	* Copyright (c) 2000-2007 Apple Inc. All rights reserved.
5d5c5d0d	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
91447636	5	*
2d21ac55 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28	/*
	29	* NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
	30	* support for mandatory and extensible security protections. This notice
	31	* is included in support of clause 2.2 (b) of the Apple Public License,
	32	* Version 2.0.
91447636 A	33	*/
	34	/* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */
	35
	36	/*
	37	* SVID compatible sem_internal.h file
	38	*
	39	* Author: Daniel Boulet
	40	*/
	41	/*
	42	* John Bellardo modified the implementation for Darwin. 12/2000
	43	*/
	44
	45	#ifndef _SYS_SEM__INTERNALH_
	46	#define _SYS_SEM__INTERNALH_
	47
	48	#include <sys/sem.h>
	49	#include <sys/cdefs.h>
	50
	51
	52	/*
	53	* This structure is variant for 64 bits because of sem_otime and sem_ctime.
	54	*/
	55
	56	#if __DARWIN_ALIGN_NATURAL
	57	#pragma options align=natural
	58	#endif
	59
	60	struct user_semid_ds {
	61	struct ipc_perm sem_perm; /* [XSI] operation permission struct */
	62	struct sem sem_base; / 32 bit base ptr for semaphore set */
	63	unsigned short sem_nsems; /* [XSI] number of sems in set */
	64	user_time_t sem_otime; /* [XSI] last operation time */
	65	__int32_t sem_pad1; /* RESERVED: DO NOT USE! */
	66	user_time_t sem_ctime; /* [XSI] last change time */
	67	/* Times measured in secs since */
	68	/* 00:00:00 GMT, Jan. 1, 1970 */
	69	__int32_t sem_pad2; /* RESERVED: DO NOT USE! */
	70	__int32_t sem_pad3[4]; /* RESERVED: DO NOT USE! */
	71	};
	72
	73	union user_semun {
	74	user_addr_t buf; /* buffer for IPC_STAT & IPC_SET */
	75	user_addr_t array; /* array for GETALL & SETALL */
	76	};
	77	typedef union user_semun user_semun_t;
	78
	79	#if __DARWIN_ALIGN_NATURAL
	80	#pragma options align=reset
	81	#endif
	82
	83
	84	/*
	85	* Kernel implementation stuff
	86	*/
	87	#define SEMVMX 32767 /* semaphore maximum value */
	88	#define SEMAEM 16384 /* adjust on exit max value */
	89
	90	/*
	91	* Configuration parameters. SEMMNI, SEMMNS, and SEMMNU are hard limits.
	92	* The code dynamically allocates enough memory to satisfy the current
	93	* demand in even increments of SEMMNI_INC, SEMMNS_INC, and SEMMNU_INC.
	94	* The code will never allocate more than the hard limits. The *_INC's
	95	* are defined in the kernel section of the header.
	96	*/
97	/*
98	* Configuration parameters
99	*/
100	#ifndef SEMMNS /* # of semaphores in system */
101	#define SEMMNS (1048576/sizeof(struct sem))
102	#endif /* no more than 1M of semaphore data */
103	#ifndef SEMMNI /* # of semaphore identifiers */
104	#define SEMMNI SEMMNS /* max of 1 for each semaphore */
105	#endif
106	#ifndef SEMUME
107	#define SEMUME 10 /* max # of undo entries per process */
108	#endif
109	#ifndef SEMMNU /* # of undo structures in system */
110	#define SEMMNU SEMMNS /* 1 for each semaphore. This is quite large */
111	#endif /* This should be max 1 for each process */
112
113	/* shouldn't need tuning */
114	#ifndef SEMMAP
115	#define SEMMAP 30 /* # of entries in semaphore map */
116	#endif
117	#ifndef SEMMSL
118	#define SEMMSL SEMMNS /* max # of semaphores per id */
119	#endif
120	#ifndef SEMOPM
121	#define SEMOPM 100 /* max # of operations per semop call */
122	#endif
123
124
125	/*
126	* Undo structure (internal: one per process)
127	*/
128	struct sem_undo {
2d21ac55	129	int un_next_idx; /* index of next active undo structure */
91447636 A	130	struct proc un_proc; / owner of this structure */
	131	short un_cnt; /* # of active entries */
	132	struct undo {
	133	short une_adjval; /* adjust on exit values */
	134	short une_num; /* semaphore # */
	135	int une_id; /* semid */
	136	struct undo une_next; / next undo entry */
	137	} un_ent; / undo entries */
	138	};
	139
	140	/*
	141	* semaphore info struct (internal; for administrative limits and ipcs)
	142	*/
	143	struct seminfo {
	144	int semmap, /* # of entries in semaphore map */
	145	semmni, /* # of semaphore identifiers */
	146	semmns, /* # of semaphores in system */
	147	semmnu, /* # of undo structures in system */
	148	semmsl, /* max # of semaphores per id */
	149	semopm, /* max # of operations per semop call */
	150	semume, /* max # of undo entries per process */
	151	semusz, /* size in bytes of undo structure */
	152	semvmx, /* semaphore maximum value */
	153	semaem; /* adjust on exit max value */
	154	};
	155	extern struct seminfo seminfo;
	156
2d21ac55 A	157	/*
	158	* Kernel wrapper for the user-level structure
	159	*/
	160	struct semid_kernel {
	161	struct user_semid_ds u;
	162	struct label label; / MAC framework label */
	163	};
	164
	165
91447636 A	166	/* internal "mode" bits */
	167	#define SEM_ALLOC 01000 /* semaphore is allocated */
	168	#define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
	169
	170	#define SEMMNI_INC 8 /* increment value for semaphore identifiers */
	171	#define SEMMNS_INC 64 /* increment value for semaphores */
	172	#define SEMMNU_INC 32 /* increment value for undo structures */
	173
	174	/*
	175	* Due to the way semaphore memory is allocated, we have to ensure that
	176	* SEMUSZ is properly aligned.
	177	*
	178	* We are not doing strange semaphore memory allocation anymore, so
	179	* these macros are no longer needed.
	180	*/
	181
	182	/*
	183	* #define SEM_ALIGN(bytes) (((bytes) + (sizeof(long) - 1)) & ~(sizeof(long) - 1))
	184	*/
	185
	186	/* actual size of an undo structure */
	187	/*
	188	* #define SEMUSZ SEM_ALIGN(offsetof(struct sem_undo, un_ent[SEMUME]))
	189	*/
	190	#define SEMUSZ sizeof(struct sem_undo)
	191
2d21ac55	192	extern struct semid_kernel sema; / semaphore id pool */
91447636 A	193	extern struct sem sem_pool; / semaphore pool */
	194	/* This is now a struct sem_undo with the new memory allocation
	195	* extern int *semu; // undo structure pool
	196	*/
	197	extern struct sem_undo semu; / undo structure pool */
	198
	199	/*
	200	* Macro to find a particular sem_undo vector
	201	*/
	202	/* Until we can initialize seminfo.semusz to SEMUSZ, we hard code the size macro
	203	* in SEMU. This should be fixed when (if) we implement dynamic pool sizes
	204	*
	205	* #define SEMU(ix) ((struct sem_undo )(((intptr_t)semu)+ix seminfo.semusz))
	206	*/
	207	/*
	208	* This macro doesn't work because we are using a staticly allocated array
	209	* for semu now.
	210	* #define SEMU(ix) ((struct sem_undo )(((intptr_t)semu)+ix SEMUSZ))
	211	*/
	212	#define SEMU(ix) (&semu[ix])
	213
	214
	215	/*
	216	* Process sem_undo vectors at proc exit.
	217	*/
	218	void semexit(struct proc *p);
	219
91447636	220	#endif /* !_SYS_SEM__INTERNALH_ */