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authorUlrich Drepper <drepper@redhat.com>2000-01-02 06:01:06 +0000
committerUlrich Drepper <drepper@redhat.com>2000-01-02 06:01:06 +0000
commit8d6f1731fcd082e4f744ba9cb4bde4be7c08f1b3 (patch)
tree099a250d7366aef2ab028fdb24f0d692cd784b4a /db2/include/mp.h
parent9a6450d578556c11e7c173d2f28362345b8f1258 (diff)
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Update.
	* Makeconfig (all-subdirs): Remove db and db2.
	* db/*: Removed.
	* db2/*: Removed.
Diffstat (limited to 'db2/include/mp.h')
-rw-r--r--db2/include/mp.h299
1 files changed, 0 insertions, 299 deletions
diff --git a/db2/include/mp.h b/db2/include/mp.h
deleted file mode 100644
index 904bccfe98..0000000000
--- a/db2/include/mp.h
+++ /dev/null
@@ -1,299 +0,0 @@
-/*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996, 1997, 1998
- *	Sleepycat Software.  All rights reserved.
- *
- *	@(#)mp.h	10.37 (Sleepycat) 1/1/99
- */
-
-struct __bh;		typedef struct __bh BH;
-struct __db_mpreg;	typedef struct __db_mpreg DB_MPREG;
-struct __mpool;		typedef struct __mpool MPOOL;
-struct __mpoolfile;	typedef struct __mpoolfile MPOOLFILE;
-
-					/* Default mpool name. */
-#define	DB_DEFAULT_MPOOL_FILE	"__db_mpool.share"
-
-/*
- * We default to 256K (32 8K pages) if the user doesn't specify, and
- * require a minimum of 20K.
- */
-#ifndef	DB_CACHESIZE_DEF
-#define	DB_CACHESIZE_DEF	(256 * 1024)
-#endif
-#define	DB_CACHESIZE_MIN	( 20 * 1024)
-
-#define	INVALID		0		/* Invalid shared memory offset. */
-
-/*
- * There are three ways we do locking in the mpool code:
- *
- * Locking a handle mutex to provide concurrency for DB_THREAD operations.
- * Locking the region mutex to provide mutual exclusion while reading and
- *    writing structures in the shared region.
- * Locking buffer header mutexes during I/O.
- *
- * The first will not be further described here.  We use the shared mpool
- * region lock to provide mutual exclusion while reading/modifying all of
- * the data structures, including the buffer headers.  We use a per-buffer
- * header lock to wait on buffer I/O.  The order of locking is as follows:
- *
- * Searching for a buffer:
- *	Acquire the region lock.
- *	Find the buffer header.
- *	Increment the reference count (guarantee the buffer stays).
- *	While the BH_LOCKED flag is set (I/O is going on) {
- *	    Release the region lock.
- *		Explicitly yield the processor if it's not the first pass
- *		through this loop, otherwise, we can simply spin because
- *		we'll be simply switching between the two locks.
- *	    Request the buffer lock.
- *	    The I/O will complete...
- *	    Acquire the buffer lock.
- *	    Release the buffer lock.
- *	    Acquire the region lock.
- *	}
- *	Return the buffer.
- *
- * Reading/writing a buffer:
- *	Acquire the region lock.
- *	Find/create the buffer header.
- *	If reading, increment the reference count (guarantee the buffer stays).
- *	Set the BH_LOCKED flag.
- *	Acquire the buffer lock (guaranteed not to block).
- *	Release the region lock.
- *	Do the I/O and/or initialize the buffer contents.
- *	Release the buffer lock.
- *	    At this point, the buffer lock is available, but the logical
- *	    operation (flagged by BH_LOCKED) is not yet completed.  For
- *	    this reason, among others, threads checking the BH_LOCKED flag
- *	    must loop around their test.
- *	Acquire the region lock.
- *	Clear the BH_LOCKED flag.
- *	Release the region lock.
- *	Return/discard the buffer.
- *
- * Pointers to DB_MPOOL, MPOOL, DB_MPOOLFILE and MPOOLFILE structures are not
- * reacquired when a region lock is reacquired because they couldn't have been
- * closed/discarded and because they never move in memory.
- */
-#define	LOCKINIT(dbmp, mutexp)						\
-	if (F_ISSET(dbmp, MP_LOCKHANDLE | MP_LOCKREGION))		\
-		(void)__db_mutex_init(mutexp,				\
-		    MUTEX_LOCK_OFFSET((dbmp)->reginfo.addr, mutexp))
-
-#define	LOCKHANDLE(dbmp, mutexp)					\
-	if (F_ISSET(dbmp, MP_LOCKHANDLE))				\
-		(void)__db_mutex_lock(mutexp, (dbmp)->reginfo.fd)
-#define	UNLOCKHANDLE(dbmp, mutexp)					\
-	if (F_ISSET(dbmp, MP_LOCKHANDLE))				\
-		(void)__db_mutex_unlock(mutexp, (dbmp)->reginfo.fd)
-
-#define	LOCKREGION(dbmp)						\
-	if (F_ISSET(dbmp, MP_LOCKREGION))				\
-		(void)__db_mutex_lock(&((RLAYOUT *)(dbmp)->mp)->lock,	\
-		    (dbmp)->reginfo.fd)
-#define	UNLOCKREGION(dbmp)						\
-	if (F_ISSET(dbmp, MP_LOCKREGION))				\
-		(void)__db_mutex_unlock(&((RLAYOUT *)(dbmp)->mp)->lock,	\
-		(dbmp)->reginfo.fd)
-
-#define	LOCKBUFFER(dbmp, bhp)						\
-	if (F_ISSET(dbmp, MP_LOCKREGION))				\
-		(void)__db_mutex_lock(&(bhp)->mutex, (dbmp)->reginfo.fd)
-#define	UNLOCKBUFFER(dbmp, bhp)						\
-	if (F_ISSET(dbmp, MP_LOCKREGION))				\
-		(void)__db_mutex_unlock(&(bhp)->mutex, (dbmp)->reginfo.fd)
-
-/* Check for region catastrophic shutdown. */
-#define	MP_PANIC_CHECK(dbmp) {						\
-	if ((dbmp)->mp->rlayout.panic)					\
-		return (DB_RUNRECOVERY);				\
-}
-
-/*
- * DB_MPOOL --
- *	Per-process memory pool structure.
- */
-struct __db_mpool {
-/* These fields need to be protected for multi-threaded support. */
-	db_mutex_t	*mutexp;	/* Structure lock. */
-
-					/* List of pgin/pgout routines. */
-	LIST_HEAD(__db_mpregh, __db_mpreg) dbregq;
-
-					/* List of DB_MPOOLFILE's. */
-	TAILQ_HEAD(__db_mpoolfileh, __db_mpoolfile) dbmfq;
-
-/* These fields are not protected. */
-	DB_ENV     *dbenv;		/* Reference to error information. */
-	REGINFO	    reginfo;		/* Region information. */
-
-	MPOOL	   *mp;			/* Address of the shared MPOOL. */
-
-	void	   *addr;		/* Address of shalloc() region. */
-
-	DB_HASHTAB *htab;		/* Hash table of bucket headers. */
-
-#define	MP_LOCKHANDLE	0x01		/* Threaded, lock handles and region. */
-#define	MP_LOCKREGION	0x02		/* Concurrent access, lock region. */
-	u_int32_t  flags;
-};
-
-/*
- * DB_MPREG --
- *	DB_MPOOL registry of pgin/pgout functions.
- */
-struct __db_mpreg {
-	LIST_ENTRY(__db_mpreg) q;	/* Linked list. */
-
-	int ftype;			/* File type. */
-					/* Pgin, pgout routines. */
-	int (DB_CALLBACK *pgin) __P((db_pgno_t, void *, DBT *));
-	int (DB_CALLBACK *pgout) __P((db_pgno_t, void *, DBT *));
-};
-
-/*
- * DB_MPOOLFILE --
- *	Per-process DB_MPOOLFILE information.
- */
-struct __db_mpoolfile {
-/* These fields need to be protected for multi-threaded support. */
-	db_mutex_t	*mutexp;	/* Structure lock. */
-
-	int	   fd;			/* Underlying file descriptor. */
-
-	u_int32_t ref;			/* Reference count. */
-
-	/*
-	 * !!!
-	 * This field is a special case -- it's protected by the region lock
-	 * NOT the thread lock.  The reason for this is that we always have
-	 * the region lock immediately before or after we modify the field,
-	 * and we don't want to use the structure lock to protect it because
-	 * then I/O (which is done with the structure lock held because of
-	 * the race between the seek and write of the file descriptor) will
-	 * block any other put/get calls using this DB_MPOOLFILE structure.
-	 */
-	u_int32_t pinref;		/* Pinned block reference count. */
-
-/* These fields are not protected. */
-	TAILQ_ENTRY(__db_mpoolfile) q;	/* Linked list of DB_MPOOLFILE's. */
-
-	DB_MPOOL  *dbmp;		/* Overlying DB_MPOOL. */
-	MPOOLFILE *mfp;			/* Underlying MPOOLFILE. */
-
-	void	  *addr;		/* Address of mmap'd region. */
-	size_t	   len;			/* Length of mmap'd region. */
-
-/* These fields need to be protected for multi-threaded support. */
-#define	MP_READONLY	0x01		/* File is readonly. */
-#define	MP_UPGRADE	0x02		/* File descriptor is readwrite. */
-#define	MP_UPGRADE_FAIL	0x04		/* Upgrade wasn't possible. */
-	u_int32_t  flags;
-};
-
-/*
- * MPOOL --
- *	Shared memory pool region.  One of these is allocated in shared
- *	memory, and describes the pool.
- */
-struct __mpool {
-	RLAYOUT	    rlayout;		/* General region information. */
-
-	SH_TAILQ_HEAD(__bhq) bhq;	/* LRU list of buckets. */
-	SH_TAILQ_HEAD(__bhfq) bhfq;	/* Free buckets. */
-	SH_TAILQ_HEAD(__mpfq) mpfq;	/* List of MPOOLFILEs. */
-
-	/*
-	 * We make the assumption that the early pages of the file are far
-	 * more likely to be retrieved than the later pages, which means
-	 * that the top bits are more interesting for hashing since they're
-	 * less likely to collide.  On the other hand, since 512 4K pages
-	 * represents a 2MB file, only the bottom 9 bits of the page number
-	 * are likely to be set.  We XOR in the offset in the MPOOL of the
-	 * MPOOLFILE that backs this particular page, since that should also
-	 * be unique for the page.
-	 */
-#define	BUCKET(mp, mf_offset, pgno)					\
-	(((pgno) ^ ((mf_offset) << 9)) % (mp)->htab_buckets)
-
-	size_t	    htab;		/* Hash table offset. */
-	size_t	    htab_buckets;	/* Number of hash table entries. */
-
-	DB_LSN	    lsn;		/* Maximum checkpoint LSN. */
-	u_int32_t   lsn_cnt;		/* Checkpoint buffers left to write. */
-
-	DB_MPOOL_STAT stat;		/* Global mpool statistics. */
-
-#define	MP_LSN_RETRY	0x01		/* Retry all BH_WRITE buffers. */
-	u_int32_t  flags;
-};
-
-/*
- * MPOOLFILE --
- *	Shared DB_MPOOLFILE information.
- */
-struct __mpoolfile {
-	SH_TAILQ_ENTRY  q;		/* List of MPOOLFILEs */
-
-	u_int32_t ref;			/* Reference count. */
-
-	int	  ftype;		/* File type. */
-
-	int32_t	  lsn_off;		/* Page's LSN offset. */
-	u_int32_t clear_len;		/* Bytes to clear on page create. */
-
-	size_t	  path_off;		/* File name location. */
-	size_t	  fileid_off;		/* File identification location. */
-
-	size_t	  pgcookie_len;		/* Pgin/pgout cookie length. */
-	size_t	  pgcookie_off;		/* Pgin/pgout cookie location. */
-
-	u_int32_t lsn_cnt;		/* Checkpoint buffers left to write. */
-
-	db_pgno_t last_pgno;		/* Last page in the file. */
-	db_pgno_t orig_last_pgno;	/* Original last page in the file. */
-
-#define	MP_CAN_MMAP	0x01		/* If the file can be mmap'd. */
-#define	MP_TEMP		0x02		/* Backing file is a temporary. */
-	u_int32_t  flags;
-
-	DB_MPOOL_FSTAT stat;		/* Per-file mpool statistics. */
-};
-
-/*
- * BH --
- *	Buffer header.
- */
-struct __bh {
-	db_mutex_t	mutex;		/* Structure lock. */
-
-	u_int16_t	ref;		/* Reference count. */
-
-#define	BH_CALLPGIN	0x001		/* Page needs to be reworked... */
-#define	BH_DIRTY	0x002		/* Page was modified. */
-#define	BH_DISCARD	0x004		/* Page is useless. */
-#define	BH_LOCKED	0x008		/* Page is locked (I/O in progress). */
-#define	BH_TRASH	0x010		/* Page is garbage. */
-#define	BH_WRITE	0x020		/* Page scheduled for writing. */
-	u_int16_t  flags;
-
-	SH_TAILQ_ENTRY	q;		/* LRU queue. */
-	SH_TAILQ_ENTRY	hq;		/* MPOOL hash bucket queue. */
-
-	db_pgno_t pgno;			/* Underlying MPOOLFILE page number. */
-	size_t	  mf_offset;		/* Associated MPOOLFILE offset. */
-
-	/*
-	 * !!!
-	 * This array must be size_t aligned -- the DB access methods put PAGE
-	 * and other structures into it, and expect to be able to access them
-	 * directly.  (We guarantee size_t alignment in the db_mpool(3) manual
-	 * page as well.)
-	 */
-	u_int8_t   buf[1];		/* Variable length data. */
-};
-
-#include "mp_ext.h"