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645 lines
16 KiB
645 lines
16 KiB
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 1997, 1998, 1999
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* Sleepycat Software. All rights reserved.
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*/
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#include "db_config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)lock_deadlock.c 11.7 (Sleepycat) 10/19/99";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <errno.h>
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#include <string.h>
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#endif
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#include "db_int.h"
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#include "db_shash.h"
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#include "lock.h"
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#include "txn.h"
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#define ISSET_MAP(M, N) ((M)[(N) / 32] & (1 << (N) % 32))
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#define CLEAR_MAP(M, N) { \
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u_int32_t __i; \
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for (__i = 0; __i < (N); __i++) \
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(M)[__i] = 0; \
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}
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#define SET_MAP(M, B) ((M)[(B) / 32] |= (1 << ((B) % 32)))
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#define CLR_MAP(M, B) ((M)[(B) / 32] &= ~(1 << ((B) % 32)))
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#define OR_MAP(D, S, N) { \
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u_int32_t __i; \
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for (__i = 0; __i < (N); __i++) \
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D[__i] |= S[__i]; \
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}
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#define BAD_KILLID 0xffffffff
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typedef struct {
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int valid;
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u_int32_t id;
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u_int32_t last_lock;
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u_int32_t last_locker_id;
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db_pgno_t pgno;
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} locker_info;
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static int CDB___dd_abort __P((DB_ENV *, locker_info *));
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static int CDB___dd_build
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__P((DB_ENV *, u_int32_t **, u_int32_t *, locker_info **));
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static int CDB___dd_find
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__P((u_int32_t *, locker_info *, u_int32_t, u_int32_t ***));
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#ifdef DIAGNOSTIC
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static void __dd_debug __P((DB_ENV *, locker_info *, u_int32_t *, u_int32_t));
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#endif
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int
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CDB_lock_detect(dbenv, flags, atype, abortp)
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DB_ENV *dbenv;
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u_int32_t flags, atype;
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int *abortp;
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{
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DB_LOCKREGION *region;
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DB_LOCKTAB *lt;
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locker_info *idmap;
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u_int32_t *bitmap, **deadp, **free_me, i, killid, nentries, nlockers;
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int do_pass, ret;
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PANIC_CHECK(dbenv);
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ENV_REQUIRES_CONFIG(dbenv, dbenv->lk_handle, DB_INIT_LOCK);
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lt = dbenv->lk_handle;
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if (abortp != NULL)
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*abortp = 0;
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/* Validate arguments. */
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if ((ret =
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CDB___db_fchk(dbenv, "CDB_lock_detect", flags, DB_LOCK_CONFLICT)) != 0)
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return (ret);
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/* Check if a detector run is necessary. */
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LOCKREGION(dbenv, lt);
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if (LF_ISSET(DB_LOCK_CONFLICT)) {
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/* Make a pass every time a lock waits. */
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MEMORY_LOCK(lt);
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region = lt->reginfo.primary;
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do_pass = region->need_dd != 0;
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MEMORY_UNLOCK(lt);
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if (!do_pass) {
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UNLOCKREGION(dbenv, lt);
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return (0);
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}
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}
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/* Build the waits-for bitmap. */
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ret = CDB___dd_build(dbenv, &bitmap, &nlockers, &idmap);
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UNLOCKREGION(dbenv, lt);
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if (ret != 0)
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return (ret);
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if (nlockers == 0)
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return (0);
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#ifdef DIAGNOSTIC
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if (FLD_ISSET(dbenv->verbose, DB_VERB_WAITSFOR))
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__dd_debug(dbenv, idmap, bitmap, nlockers);
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#endif
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/* Find a deadlock. */
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if ((ret = CDB___dd_find(bitmap, idmap, nlockers, &deadp)) != 0)
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return (ret);
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nentries = ALIGN(nlockers, 32) / 32;
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killid = BAD_KILLID;
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free_me = deadp;
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for (; *deadp != NULL; deadp++) {
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if (abortp != NULL)
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++*abortp;
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switch (atype) { /* Kill someone. */
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case DB_LOCK_OLDEST:
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/*
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* Find the first bit set in the current
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* array and then look for a lower tid in
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* the array.
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*/
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for (i = 0; i < nlockers; i++)
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if (ISSET_MAP(*deadp, i)) {
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killid = i;
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break;
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}
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/*
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* It's conceivable that under XA, the locker could
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* have gone away.
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*/
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if (killid == BAD_KILLID)
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break;
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/*
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* The oldest transaction has the lowest
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* transaction id.
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*/
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for (i = killid + 1; i < nlockers; i++)
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if (ISSET_MAP(*deadp, i) &&
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idmap[i].id < idmap[killid].id)
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killid = i;
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break;
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case DB_LOCK_DEFAULT:
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case DB_LOCK_RANDOM:
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/*
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* We are trying to calculate the id of the
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* locker whose entry is indicated by deadlock.
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*/
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killid = (*deadp - bitmap) / nentries;
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break;
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case DB_LOCK_YOUNGEST:
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/*
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* Find the first bit set in the current
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* array and then look for a lower tid in
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* the array.
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*/
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for (i = 0; i < nlockers; i++)
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if (ISSET_MAP(*deadp, i)) {
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killid = i;
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break;
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}
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/*
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* It's conceivable that under XA, the locker could
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* have gone away.
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*/
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if (killid == BAD_KILLID)
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break;
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/*
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* The youngest transaction has the highest
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* transaction id.
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*/
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for (i = killid + 1; i < nlockers; i++)
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if (ISSET_MAP(*deadp, i) &&
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idmap[i].id > idmap[killid].id)
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killid = i;
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break;
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default:
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killid = BAD_KILLID;
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ret = EINVAL;
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}
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if (killid == BAD_KILLID)
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continue;
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/* Kill the locker with lockid idmap[killid]. */
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if ((ret = CDB___dd_abort(dbenv, &idmap[killid])) != 0) {
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/*
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* It's possible that the lock was already aborted;
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* this isn't necessarily a problem, so do not treat
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* it as an error.
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*/
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if (ret == EINVAL)
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ret = 0;
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else
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CDB___db_err(dbenv,
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"warning: unable to abort locker %lx",
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(u_long)idmap[killid].id);
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} else if (FLD_ISSET(dbenv->verbose, DB_VERB_DEADLOCK))
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CDB___db_err(dbenv,
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"Aborting locker %lx", (u_long)idmap[killid].id);
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}
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CDB___os_free(free_me, 0);
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CDB___os_free(bitmap, 0);
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CDB___os_free(idmap, 0);
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return (ret);
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}
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/*
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* ========================================================================
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* Utilities
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*/
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# define DD_INVALID_ID ((u_int32_t) -1)
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static int
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CDB___dd_build(dbenv, bmp, nlockers, idmap)
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DB_ENV *dbenv;
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u_int32_t **bmp, *nlockers;
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locker_info **idmap;
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{
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struct __db_lock *lp;
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DB_LOCKER *lip, *lockerp, *child;
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DB_LOCKOBJ *op, *lo;
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DB_LOCKREGION *region;
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DB_LOCKTAB *lt;
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locker_info *id_array;
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u_int32_t *bitmap, count, dd, *entryp, i, id, ndx, nentries, *tmpmap;
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u_int8_t *pptr;
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int is_first, ret;
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lt = dbenv->lk_handle;
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region = lt->reginfo.primary;
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/*
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* We'll check how many lockers there are, add a few more in for
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* good measure and then allocate all the structures. Then we'll
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* verify that we have enough room when we go back in and get the
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* mutex the second time.
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*/
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MEMORY_LOCK(lt);
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retry: count = region->nlockers;
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region->need_dd = 0;
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MEMORY_UNLOCK(lt);
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if (count == 0) {
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*nlockers = 0;
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return (0);
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}
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if (FLD_ISSET(dbenv->verbose, DB_VERB_DEADLOCK))
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CDB___db_err(dbenv, "%lu lockers", (u_long)count);
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count += 40;
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nentries = ALIGN(count, 32) / 32;
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/*
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* Allocate enough space for a count by count bitmap matrix.
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*
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* XXX
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* We can probably save the malloc's between iterations just
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* reallocing if necessary because count grew by too much.
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*/
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if ((ret = CDB___os_calloc((size_t)count,
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sizeof(u_int32_t) * nentries, &bitmap)) != 0)
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return (ret);
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if ((ret = CDB___os_calloc(sizeof(u_int32_t), nentries, &tmpmap)) != 0) {
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CDB___os_free(bitmap, sizeof(u_int32_t) * nentries);
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return (ret);
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}
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if ((ret =
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CDB___os_calloc((size_t)count, sizeof(locker_info), &id_array)) != 0) {
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CDB___os_free(bitmap, count * sizeof(u_int32_t) * nentries);
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CDB___os_free(tmpmap, sizeof(u_int32_t) * nentries);
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return (ret);
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}
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/*
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* Now go back in and actually fill in the matrix.
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*/
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MEMORY_LOCK(lt);
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if (region->nlockers > count) {
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CDB___os_free(bitmap, count * sizeof(u_int32_t) * nentries);
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CDB___os_free(tmpmap, sizeof(u_int32_t) * nentries);
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CDB___os_free(id_array, count * sizeof(locker_info));
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goto retry;
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}
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MEMORY_UNLOCK(lt);
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/*
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* First we go through and assign each locker a deadlock detector id.
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*/
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for (id = 0, i = 0; i < region->table_size; i++) {
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LOCKER_LOCK_NDX(lt, i);
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for (lip = SH_TAILQ_FIRST(<->locker_tab[i], __db_locker);
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lip != NULL; lip = SH_TAILQ_NEXT(lip, links, __db_locker))
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if (lip->master_locker == INVALID_ROFF) {
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lip->dd_id = id++;
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id_array[lip->dd_id].id = lip->id;
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} else
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lip->dd_id = DD_INVALID_ID;
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LOCKER_UNLOCK(lt, i);
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}
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/*
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* We go through the hash table and find each object. For each object,
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* we traverse the waiters list and add an entry in the waitsfor matrix
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* for each waiter/holder combination. We acquire the hash bucket
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* locks as we go and then release them all at the end.
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*/
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for (i = 0; i < region->table_size; i++) {
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OBJECT_LOCK_NDX(lt, i);
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for (op = SH_TAILQ_FIRST(<->obj_tab[i], __db_lockobj);
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op != NULL; op = SH_TAILQ_NEXT(op, links, __db_lockobj)) {
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CLEAR_MAP(tmpmap, nentries);
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/*
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* First we go through and create a bit map that
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* represents all the holders of this object.
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*/
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for (lp = SH_TAILQ_FIRST(&op->holders, __db_lock);
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lp != NULL;
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lp = SH_TAILQ_NEXT(lp, links, __db_lock)) {
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LOCKER_LOCK(lt, region, lp->holder, ndx);
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if ((ret = CDB___lock_getlocker(lt,
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lp->holder, ndx, 0, &lockerp)) != 0) {
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LOCKER_UNLOCK(lt, ndx);
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continue;
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}
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if (lockerp->dd_id == DD_INVALID_ID)
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dd = ((DB_LOCKER *)
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R_ADDR(<->reginfo,
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lockerp->master_locker))->dd_id;
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else
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dd = lockerp->dd_id;
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id_array[dd].valid = 1;
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/*
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* If the holder has already been aborted, then
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* we should ignore it for now.
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*/
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if (lp->status == DB_LSTAT_HELD)
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SET_MAP(tmpmap, dd);
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LOCKER_UNLOCK(lt, ndx);
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}
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/*
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* Next, for each waiter, we set its row in the matrix
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* equal to the map of holders we set up above.
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*/
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for (is_first = 1,
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lp = SH_TAILQ_FIRST(&op->waiters, __db_lock);
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lp != NULL;
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is_first = 0,
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lp = SH_TAILQ_NEXT(lp, links, __db_lock)) {
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LOCKER_LOCK(lt, region, lp->holder, ndx);
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if ((ret = CDB___lock_getlocker(lt,
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lp->holder, ndx, 0, &lockerp)) != 0) {
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LOCKER_UNLOCK(lt, ndx);
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continue;
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}
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if (lockerp->dd_id == DD_INVALID_ID)
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dd = ((DB_LOCKER *)
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R_ADDR(<->reginfo,
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lockerp->master_locker))->dd_id;
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else
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dd = lockerp->dd_id;
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id_array[dd].valid = 1;
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LOCKER_UNLOCK(lt, ndx);
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/*
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* If the transaction is pending abortion, then
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* ignore it on this iteration.
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*/
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if (lp->status != DB_LSTAT_WAITING)
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continue;
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entryp = bitmap + (nentries * dd);
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OR_MAP(entryp, tmpmap, nentries);
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/*
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* If this is the first waiter on the queue,
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* then we remove the waitsfor relationship
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* with oneself. However, if it's anywhere
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* else on the queue, then we have to keep
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* it and we have an automatic deadlock.
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*/
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if (is_first)
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CLR_MAP(entryp, dd);
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}
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}
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}
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/*
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* We now have a snapshot of the entire lock table. Release the
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* object mutexes.
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*/
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for (i = 0; i < region->table_size; i++)
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OBJECT_UNLOCK(lt, i);
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/* Now for each locker; record its last lock. */
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for (id = 0; id < count; id++) {
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if (!id_array[id].valid)
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continue;
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LOCKER_LOCK(lt, region, id_array[id].id, ndx);
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if ((ret = CDB___lock_getlocker(lt,
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id_array[id].id, ndx, 0, &lockerp)) != 0) {
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CDB___db_err(dbenv,
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"No locks for locker %lu", (u_long)id_array[id].id);
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LOCKER_UNLOCK(lt, ndx);
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continue;
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}
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/*
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* If this is a master transaction, try to
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* find one of its children's locks first,
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* as they are probably more recent.
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*/
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child = SH_LIST_FIRST(&lockerp->child_locker, __db_locker);
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if (child != NULL) {
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do {
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lp = SH_LIST_FIRST(&child->heldby, __db_lock);
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if (lp != NULL &&
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lp->status == DB_LSTAT_WAITING) {
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id_array[id].last_locker_id = child->id;
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goto get_lock;
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}
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child = SH_LIST_NEXT(
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child, child_link, __db_locker);
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} while (child != NULL);
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}
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lp = SH_LIST_FIRST(&lockerp->heldby, __db_lock);
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if (lp != NULL) {
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id_array[id].last_locker_id = lockerp->id;
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get_lock: id_array[id].last_lock = R_OFFSET(<->reginfo, lp);
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lo = (DB_LOCKOBJ *)((u_int8_t *)lp + lp->obj);
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pptr = SH_DBT_PTR(&lo->lockobj);
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if (lo->lockobj.size >= sizeof(db_pgno_t))
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memcpy(&id_array[id].pgno,
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pptr, sizeof(db_pgno_t));
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else
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id_array[id].pgno = 0;
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}
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LOCKER_UNLOCK(lt, ndx);
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}
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/* Pass complete, reset the deadlock detector bit. */
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MEMORY_LOCK(lt);
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region->need_dd = 0;
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MEMORY_UNLOCK(lt);
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/*
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* Now we can release everything except the bitmap matrix that we
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* created.
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*/
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*nlockers = id;
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*idmap = id_array;
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*bmp = bitmap;
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CDB___os_free(tmpmap, sizeof(u_int32_t) * nentries);
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return (0);
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}
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static int
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CDB___dd_find(bmp, idmap, nlockers, deadp)
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u_int32_t *bmp, nlockers;
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locker_info *idmap;
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u_int32_t ***deadp;
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{
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u_int32_t i, j, k, nentries, *mymap, *tmpmap;
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u_int32_t **retp;
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int ndead, ndeadalloc, ret;
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#undef INITIAL_DEAD_ALLOC
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#define INITIAL_DEAD_ALLOC 8
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ndeadalloc = INITIAL_DEAD_ALLOC;
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ndead = 0;
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if ((ret =
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CDB___os_malloc(ndeadalloc * sizeof(u_int32_t *), NULL, &retp)) != 0)
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return (ret);
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/*
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* For each locker, OR in the bits from the lockers on which that
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* locker is waiting.
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*/
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nentries = ALIGN(nlockers, 32) / 32;
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for (mymap = bmp, i = 0; i < nlockers; i++, mymap += nentries) {
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if (!idmap[i].valid)
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continue;
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for (j = 0; j < nlockers; j++) {
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if (!ISSET_MAP(mymap, j))
|
|
continue;
|
|
|
|
/* Find the map for this bit. */
|
|
tmpmap = bmp + (nentries * j);
|
|
OR_MAP(mymap, tmpmap, nentries);
|
|
if (!ISSET_MAP(mymap, i))
|
|
continue;
|
|
|
|
/* Make sure we leave room for NULL. */
|
|
if (ndead + 2 >= ndeadalloc) {
|
|
ndeadalloc <<= 1;
|
|
/*
|
|
* If the alloc fails, then simply return the
|
|
* deadlocks that we already have.
|
|
*/
|
|
if (CDB___os_realloc(ndeadalloc * sizeof(u_int32_t),
|
|
NULL, &retp) != 0) {
|
|
retp[ndead] = NULL;
|
|
*deadp = retp;
|
|
return (0);
|
|
}
|
|
}
|
|
retp[ndead++] = mymap;
|
|
|
|
/* Mark all participants in this deadlock invalid. */
|
|
for (k = 0; k < nlockers; k++)
|
|
if (ISSET_MAP(mymap, k))
|
|
idmap[k].valid = 0;
|
|
break;
|
|
}
|
|
}
|
|
retp[ndead] = NULL;
|
|
*deadp = retp;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
CDB___dd_abort(dbenv, info)
|
|
DB_ENV *dbenv;
|
|
locker_info *info;
|
|
{
|
|
struct __db_lock *lockp;
|
|
DB_LOCKER *lockerp;
|
|
DB_LOCKOBJ *sh_obj;
|
|
DB_LOCKREGION *region;
|
|
DB_LOCKTAB *lt;
|
|
u_int32_t ndx;
|
|
int ret;
|
|
|
|
lt = dbenv->lk_handle;
|
|
region = lt->reginfo.primary;
|
|
|
|
LOCKREGION(dbenv, lt);
|
|
/* Find the locker's last lock. */
|
|
LOCKER_LOCK(lt, region, info->last_locker_id, ndx);
|
|
if ((ret = CDB___lock_getlocker(lt,
|
|
info->last_locker_id, ndx, 0, &lockerp)) != 0 || lockerp == NULL) {
|
|
if (ret == 0)
|
|
ret = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
lockp = SH_LIST_FIRST(&lockerp->heldby, __db_lock);
|
|
|
|
/*
|
|
* It's possible that this locker was already aborted. If that's
|
|
* the case, make sure that we remove its locker from the hash table.
|
|
*/
|
|
if (lockp == NULL) {
|
|
if (LOCKER_FREEABLE(lockerp)) {
|
|
CDB___lock_freelocker(lt, region, lockerp, ndx);
|
|
goto out;
|
|
}
|
|
} else if (R_OFFSET(<->reginfo, lockp) != info->last_lock ||
|
|
lockp->status != DB_LSTAT_WAITING) {
|
|
ret = EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
sh_obj = (DB_LOCKOBJ *)((u_int8_t *)lockp + lockp->obj);
|
|
SH_LIST_REMOVE(lockp, locker_links, __db_lock);
|
|
LOCKER_UNLOCK(lt, ndx);
|
|
|
|
/* Abort lock, take it off list, and wake up this lock. */
|
|
SHOBJECT_LOCK(lt, region, sh_obj, ndx);
|
|
lockp->status = DB_LSTAT_ABORTED;
|
|
SH_TAILQ_REMOVE(&sh_obj->waiters, lockp, links, __db_lock);
|
|
ret = CDB___lock_promote(lt, sh_obj);
|
|
OBJECT_UNLOCK(lt, ndx);
|
|
|
|
MUTEX_UNLOCK(&lockp->mutex);
|
|
|
|
MEMORY_LOCK(lt);
|
|
region->ndeadlocks++;
|
|
MEMORY_UNLOCK(lt);
|
|
UNLOCKREGION(dbenv, lt);
|
|
|
|
return (0);
|
|
|
|
out: UNLOCKREGION(dbenv, lt);
|
|
LOCKER_UNLOCK(lt, ndx);
|
|
return (ret);
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
static void
|
|
__dd_debug(dbenv, idmap, bitmap, nlockers)
|
|
DB_ENV *dbenv;
|
|
locker_info *idmap;
|
|
u_int32_t *bitmap, nlockers;
|
|
{
|
|
u_int32_t i, j, *mymap, nentries;
|
|
int ret;
|
|
char *msgbuf;
|
|
|
|
CDB___db_err(dbenv, "Waitsfor array\nWaiter:\tWaiting on:");
|
|
|
|
/* Allocate space to print 10 bytes per item waited on. */
|
|
#undef MSGBUF_LEN
|
|
#define MSGBUF_LEN ((nlockers + 1) * 10 + 64)
|
|
if ((ret = CDB___os_malloc(MSGBUF_LEN, NULL, &msgbuf)) != 0)
|
|
return;
|
|
|
|
nentries = ALIGN(nlockers, 32) / 32;
|
|
for (mymap = bitmap, i = 0; i < nlockers; i++, mymap += nentries) {
|
|
if (!idmap[i].valid)
|
|
continue;
|
|
sprintf(msgbuf, /* Waiter. */
|
|
"%lx/%lu:\t", (u_long)idmap[i].id, (u_long)idmap[i].pgno);
|
|
for (j = 0; j < nlockers; j++)
|
|
if (ISSET_MAP(mymap, j))
|
|
sprintf(msgbuf, "%s %lx", msgbuf,
|
|
(u_long)idmap[j].id);
|
|
(void)sprintf(msgbuf,
|
|
"%s %lu", msgbuf, (u_long)idmap[i].last_lock);
|
|
CDB___db_err(dbenv, msgbuf);
|
|
}
|
|
|
|
CDB___os_free(msgbuf, MSGBUF_LEN);
|
|
}
|
|
#endif
|