File: mp_region.c

package info (click to toggle)
htdig 1%3A3.2.0b6-16
  • links: PTS
  • area: main
  • in suites: stretch
  • size: 15,624 kB
  • ctags: 9,630
  • sloc: ansic: 49,630; cpp: 46,470; sh: 17,400; xml: 4,180; perl: 2,543; makefile: 886; php: 79; asm: 14
file content (333 lines) | stat: -rw-r--r-- 9,144 bytes parent folder | download | duplicates (9)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997, 1998, 1999
 *	Sleepycat Software.  All rights reserved.
 */
#include "db_config.h"

#ifndef lint
static const char sccsid[] = "@(#)mp_region.c	11.4 (Sleepycat) 10/19/99";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#include <errno.h>
#include <string.h>
#endif

#include "db_int.h"
#include "db_shash.h"
#include "mp.h"

static int CDB___mcache_init __P((DB_ENV *, DB_MPOOL *, int, int));
static int CDB___mpool_init __P((DB_ENV *, DB_MPOOL *, int));

/*
 * CDB___memp_open --
 *	Internal version of memp_open: only called from DB_ENV->open.
 *
 * PUBLIC: int CDB___memp_open __P((DB_ENV *));
 */
int
CDB___memp_open(dbenv)
	DB_ENV *dbenv;
{
	DB_MPOOL *dbmp;
	MPOOL *mp;
	roff_t mpr_size, reg_size, *regids;
	int i, htab_buckets, ret;

	/* Figure out how big each cache region is. */
	reg_size = dbenv->mp_gbytes / dbenv->mp_ncache;
	reg_size += (dbenv->mp_gbytes % dbenv->mp_ncache) / dbenv->mp_ncache;
	reg_size += dbenv->mp_bytes / dbenv->mp_ncache;

	/*
	 * Figure out how many hash buckets each region will have.  Assume we
	 * want to keep the hash chains with under 10 pages on each chain.  We
	 * don't know the pagesize in advance, and it may differ for different
	 * files.  Use a pagesize of 1K for the calculation -- we walk these
	 * chains a lot, they must be kept short.
	 */
	htab_buckets = CDB___db_tablesize((reg_size / (1 * 1024)) / 10);

	/* Create and initialize the DB_MPOOL structure. */
	if ((ret = CDB___os_calloc(1, sizeof(*dbmp), &dbmp)) != 0)
		return (ret);
	LIST_INIT(&dbmp->dbregq);
	TAILQ_INIT(&dbmp->dbmfq);
	dbmp->dbenv = dbenv;

	/* Clear locking for avoiding mp_alloc recursion */
	dbmp->recursion_level = 0;

	/*
	 * Join/create the mpool region.  If this is a local region we don't
	 * need much space because the most we'll store there is the pair of
	 * MPOOL and MPOOLFILE structures.  If we're creating a full-blown
	 * database environment, be generous -- I'd rather not fail because
	 * we ran out of space.
	 */
	dbmp->reginfo.id = REG_ID_MPOOL;
	dbmp->reginfo.mode = dbenv->db_mode;
	if (F_ISSET(dbenv, DB_ENV_DBLOCAL))
		mpr_size = sizeof(MPOOL) + sizeof(MPOOLFILE) + 5 * 1024;
	else
		mpr_size = sizeof(MPOOL) +
		    DB_MPOOLFILE_DEF * sizeof(MPOOLFILE) + 10 * 1024;
	if (F_ISSET(dbenv, DB_ENV_CREATE))
		F_SET(&dbmp->reginfo, REGION_CREATE_OK);
	if ((ret = CDB___db_r_attach(dbenv, &dbmp->reginfo, mpr_size)) != 0)
		goto err;

	/*
	 * If we created the region, initialize it and any additional regions,
	 * otherwise join any additional regions.
	 */
	if (F_ISSET(&dbmp->reginfo, REGION_CREATE)) {
		/* Initialize the primary region. */
		if ((ret = CDB___mpool_init(dbenv, dbmp, dbenv->mp_ncache)) != 0)
			goto err;

		/*
		 * We know how many regions there are going to be, allocate
		 * the REGINFO structures and fill in local copies of that
		 * information.
		 */
		if ((ret = CDB___os_calloc(
		    dbenv->mp_ncache, sizeof(REGINFO), &dbmp->c_reginfo)) != 0)
			goto err;
		dbmp->nc_reg = dbenv->mp_ncache;

		/* Make sure we don't clear the wrong entries on error. */
		for (i = 0; i < dbmp->nc_reg; ++i)
			dbmp->c_reginfo[i].id = REG_ID_INVALID;

		/*
		 * Create/initialize the cache regions and copy their IDs
		 * into the primary region.
		 */
		mp = R_ADDR(&dbmp->reginfo, dbmp->reginfo.rp->primary);
		regids = R_ADDR(&dbmp->reginfo, mp->c_regids);
		for (i = 0; i < dbmp->nc_reg; ++i) {
			dbmp->c_reginfo[i].id = REG_ID_INVALID;
			dbmp->c_reginfo[i].mode = dbenv->db_mode;
			F_SET(&dbmp->c_reginfo[i], REGION_CREATE_OK);
			if ((ret = CDB___db_r_attach(
			    dbenv, &dbmp->c_reginfo[i], reg_size)) != 0)
				goto err;
			if ((ret =
			    CDB___mcache_init(dbenv, dbmp, htab_buckets, i)) != 0)
				goto err;
			R_UNLOCK(dbenv, &dbmp->c_reginfo[i]);

			regids[i] = dbmp->c_reginfo[i].id;
		}
	} else {
		/*
		 * We know how many regions there are going to be, allocate
		 * the REGINFO structures and fill in local copies of that
		 * information.
		 */
		mp = R_ADDR(&dbmp->reginfo, dbmp->reginfo.rp->primary);
		if ((ret = CDB___os_calloc(
		    mp->nc_reg, sizeof(REGINFO), &dbmp->c_reginfo)) != 0)
			goto err;
		dbmp->nc_reg = mp->nc_reg;

		/* Make sure we don't clear the wrong entries on error. */
		for (i = 0; i < dbmp->nc_reg; ++i)
			dbmp->c_reginfo[i].id = REG_ID_INVALID;

		/* Join additional regions. */
		regids = R_ADDR(&dbmp->reginfo, mp->c_regids);
		for (i = 0; i < dbmp->nc_reg; ++i) {
			dbmp->c_reginfo[i].id = regids[i];
			dbmp->c_reginfo[i].mode = 0;
			if ((ret =
			    CDB___db_r_attach(dbenv, &dbmp->c_reginfo[i], 0)) != 0)
				goto err;
			R_UNLOCK(dbenv, &dbmp->c_reginfo[i]);
		}
	}

	/* Set the local addresses for the primary and cache regions. */
	dbmp->reginfo.primary = mp =
	    R_ADDR(&dbmp->reginfo, dbmp->reginfo.rp->primary);
	for (i = 0; i < dbmp->nc_reg; ++i)
		dbmp->c_reginfo[i].primary =
		    R_ADDR(&dbmp->c_reginfo[i], dbmp->c_reginfo[i].rp->primary);

	R_UNLOCK(dbenv, &dbmp->reginfo);

	/* If the region is threaded, allocate a mutex to lock the handles. */
	if (F_ISSET(dbenv, DB_ENV_THREAD)) {
		if ((ret = CDB___db_mutex_alloc(
		    dbenv, &dbmp->reginfo, &dbmp->mutexp)) != 0) {
			goto err;
		}
		if ((ret =
		    __db_mutex_init(dbenv, dbmp->mutexp, 0, MUTEX_THREAD)) != 0)
			goto err;
	}

	dbenv->mp_handle = dbmp;
	return (0);

err:	if (dbmp->reginfo.addr != NULL) {
		if (F_ISSET(&dbmp->reginfo, REGION_CREATE))
			for (i = 0; i < dbmp->nc_reg; ++i)
				if (dbmp->c_reginfo[i].id != REG_ID_INVALID)
					F_SET(dbmp->c_reginfo[i].rp, REG_DEAD);

		R_UNLOCK(dbenv, &dbmp->reginfo);

		for (i = 0; i < dbmp->nc_reg; ++i)
			if (dbmp->c_reginfo[i].id != REG_ID_INVALID)
				(void)CDB___db_r_detach(
				    dbenv, &dbmp->c_reginfo[i], 0);
		CDB___os_free(dbmp->c_reginfo,
		    dbmp->nc_reg * sizeof(*dbmp->c_reginfo));
	}
	CDB___os_free(dbmp, sizeof(*dbmp));
	return (ret);
}

/*
 * CDB___mpool_init --
 *	Initialize a MPOOL structure in shared memory.
 */
static int
CDB___mpool_init(dbenv, dbmp, nc_reg)
	DB_ENV *dbenv;
	DB_MPOOL *dbmp;
	int nc_reg;
{
	MPOOL *mp;
	int ret;
	void *p;

	if ((ret = CDB___db_shalloc(dbmp->reginfo.addr,
	    sizeof(*mp), 0, &dbmp->reginfo.primary)) != 0)
		return (ret);
	dbmp->reginfo.rp->primary =
	    R_OFFSET(&dbmp->reginfo, dbmp->reginfo.primary);
	mp = dbmp->reginfo.primary;
	memset(mp, 0, sizeof(*mp));

	SH_TAILQ_INIT(&mp->mpfq);
	if ((ret = __db_mutex_init(dbenv, &mp->sync_mutex,
	    R_OFFSET(&dbmp->reginfo, &mp->sync_mutex) + DB_FCNTL_OFF_MPOOL,
	    0)) != 0)
		return (ret);

	ZERO_LSN(mp->lsn);
	mp->lsn_cnt = 0;

	mp->nc_reg = nc_reg;
	if ((ret = CDB___db_shalloc(
	    dbmp->reginfo.addr, nc_reg * sizeof(int), 0, &p)) != 0) {
		CDB___db_shalloc_free(dbmp->reginfo.addr, dbmp->reginfo.primary);
		return (ret);
	}
	mp->c_regids = R_OFFSET(&dbmp->reginfo, p);

	return (0);
}

/*
 * CDB___mcache_init --
 *	Initialize a MCACHE structure in shared memory.
 */
static int
CDB___mcache_init(dbenv, dbmp, htab_buckets, reginfo_off)
	DB_ENV *dbenv;
	DB_MPOOL *dbmp;
	int htab_buckets, reginfo_off;
{
	DB_HASHTAB *htab;
	MCACHE *mc;
	MPOOL *mp;
	REGINFO *reginfo;
	int ret;

	COMPQUIET(dbenv, NULL);

	mp = dbmp->reginfo.primary;

	reginfo = &dbmp->c_reginfo[reginfo_off];
	if ((ret = CDB___db_shalloc(reginfo->addr,
	    sizeof(*mc), 0, &reginfo->primary)) != 0)
		return (ret);
	reginfo->rp->primary = R_OFFSET(reginfo, reginfo->primary);
	mc = reginfo->primary;
	memset(mc, 0, sizeof(*mc));

	SH_TAILQ_INIT(&mc->bhq);

	/* Allocate hash table space and initialize it. */
	if ((ret = CDB___db_shalloc(reginfo->addr,
	    htab_buckets * sizeof(DB_HASHTAB), 0, &htab)) != 0) {
		CDB___db_shalloc_free(reginfo->addr, reginfo->primary);
		return (ret);
	}
	CDB___db_hashinit(htab, htab_buckets);
	mc->htab = R_OFFSET(reginfo, htab);
	mc->htab_buckets = htab_buckets;

	return (0);
}

/*
 * CDB___memp_close --
 *	Internal version of memp_close: only called from DB_ENV->close.
 *
 * PUBLIC: int CDB___memp_close __P((DB_ENV *));
 */
int
CDB___memp_close(dbenv)
	DB_ENV *dbenv;
{
	DB_MPOOL *dbmp;
	DB_MPOOLFILE *dbmfp;
	DB_MPREG *mpreg;
	int i, ret, t_ret;

	ret = 0;
	dbmp = dbenv->mp_handle;

	/* Discard DB_MPREGs. */
	while ((mpreg = LIST_FIRST(&dbmp->dbregq)) != NULL) {
		LIST_REMOVE(mpreg, q);
		CDB___os_free(mpreg, sizeof(DB_MPREG));
	}

	/* Discard DB_MPOOLFILEs. */
	while ((dbmfp = TAILQ_FIRST(&dbmp->dbmfq)) != NULL) {
	        if(F_ISSET(dbmfp, MP_CMPR)) {
		  dbmfp->cmpr_context.weakcmpr = 0;
		  F_CLR(dbmfp, MP_CMPR);
	        }
		if ((t_ret = CDB_memp_fclose(dbmfp)) != 0 && ret == 0)
			ret = t_ret;
	}

	/* Discard the thread mutex. */
	if (dbmp->mutexp != NULL)
		CDB___db_mutex_free(dbenv, &dbmp->reginfo, dbmp->mutexp);

	/* Detach from the region(s). */
	for (i = 0; i < dbmp->nc_reg; ++i)
		if ((t_ret = CDB___db_r_detach(
		    dbenv, &dbmp->c_reginfo[i], 0)) != 0 && ret == 0)
			ret = t_ret;
	if ((t_ret = CDB___db_r_detach(dbenv, &dbmp->reginfo, 0)) != 0 && ret == 0)
		ret = t_ret;

	CDB___os_free(dbmp->c_reginfo, dbmp->nc_reg * sizeof(*dbmp->c_reginfo));
	CDB___os_free(dbmp, sizeof(*dbmp));

	return (ret);
}