1 files changed, 213 insertions, 0 deletions
diff --git a/databases/db4/patches/patch-bc b/databases/db4/patches/patch-bc
new file mode 100644
index 00000000000..0261251b8e8
--- /dev/null
+++ b/databases/db4/patches/patch-bc
@@ -0,0 +1,213 @@
+$NetBSD: patch-bc,v 1.1 2009/01/21 15:44:32 drochner Exp $
+
+--- lock/lock_deadlock.c.orig	2009-01-16 19:58:12.000000000 +0100
++++ lock/lock_deadlock.c
+@@ -121,7 +121,7 @@ __lock_detect(env, atype, rejectp)
+ 	DB_LOCKTAB *lt;
+ 	db_timespec now;
+ 	locker_info *idmap;
+-	u_int32_t *bitmap, *copymap, **deadp, **free_me, *tmpmap;
++	u_int32_t *bitmap, *copymap, **deadp, **deadlist, *tmpmap;
+ 	u_int32_t i, cid, keeper, killid, limit, nalloc, nlockers;
+ 	u_int32_t lock_max, txn_max;
+ 	int ret, status;
+@@ -133,7 +133,8 @@ __lock_detect(env, atype, rejectp)
+ 	if (IS_REP_CLIENT(env))
+ 		atype = DB_LOCK_MINWRITE;
+ 
+-	free_me = NULL;
++	copymap = tmpmap = NULL;
++	deadlist = NULL;
+ 
+ 	lt = env->lk_handle;
+ 	if (rejectp != NULL)
+@@ -179,11 +180,11 @@ __lock_detect(env, atype, rejectp)
+ 	memcpy(copymap, bitmap, nlockers * sizeof(u_int32_t) * nalloc);
+ 
+ 	if ((ret = __os_calloc(env, sizeof(u_int32_t), nalloc, &tmpmap)) != 0)
+-		goto err1;
++		goto err;
+ 
+ 	/* Find a deadlock. */
+ 	if ((ret =
+-	    __dd_find(env, bitmap, idmap, nlockers, nalloc, &deadp)) != 0)
++	    __dd_find(env, bitmap, idmap, nlockers, nalloc, &deadlist)) != 0)
+ 		return (ret);
+ 
+ 	/*
+@@ -204,8 +205,7 @@ __lock_detect(env, atype, rejectp)
+ 		txn_max = TXN_MAXIMUM;
+ 
+ 	killid = BAD_KILLID;
+-	free_me = deadp;
+-	for (; *deadp != NULL; deadp++) {
++	for (deadp = deadlist; *deadp != NULL; deadp++) {
+ 		if (rejectp != NULL)
+ 			++*rejectp;
+ 		killid = (u_int32_t)(*deadp - bitmap) / nalloc;
+@@ -342,11 +342,12 @@ dokill:		if (killid == BAD_KILLID) {
+ 			__db_msg(env,
+ 			    "Aborting locker %lx", (u_long)idmap[killid].id);
+ 	}
+-	__os_free(env, tmpmap);
+-err1:	__os_free(env, copymap);
+-
+-err:	if (free_me != NULL)
+-		__os_free(env, free_me);
++err:	if(copymap != NULL)
++		__os_free(env, copymap);
++	if (deadlist != NULL)
++		__os_free(env, deadlist);
++	if(tmpmap != NULL)
++		__os_free(env, tmpmap);
+ 	__os_free(env, bitmap);
+ 	__os_free(env, idmap);
+ 
+@@ -360,6 +361,17 @@ err:	if (free_me != NULL)
+ 
+ #define	DD_INVALID_ID	((u_int32_t) -1)
+ 
++/*
++ * __dd_build --
++ *	Build the lock dependency bit maps.
++ * Notes on syncronization:  
++ *	LOCK_SYSTEM_LOCK is used to hold objects locked when we have
++ *		a single partition.
++ *	LOCK_LOCKERS is held while we are walking the lockers list and
++ *		to single thread the use of lockerp->dd_id.
++ *	LOCK_DD protects the DD list of objects.
++ */
++
+ static int
+ __dd_build(env, atype, bmp, nlockers, allocp, idmap, rejectp)
+ 	ENV *env;
+@@ -393,6 +405,7 @@ __dd_build(env, atype, bmp, nlockers, al
+ 	 * In particular we do not build the conflict array and our caller
+ 	 * needs to expect this.
+ 	 */
++	LOCK_SYSTEM_LOCK(lt, region);
+ 	if (atype == DB_LOCK_EXPIRE) {
+ skip:		LOCK_DD(env, region);
+ 		op = SH_TAILQ_FIRST(&region->dd_objs, __db_lockobj);
+@@ -430,17 +443,18 @@ skip:		LOCK_DD(env, region);
+ 			OBJECT_UNLOCK(lt, region, indx);
+ 		}
+ 		UNLOCK_DD(env, region);
++		LOCK_SYSTEM_UNLOCK(lt, region);
+ 		goto done;
+ 	}
+ 
+ 	/*
+-	 * We'll check how many lockers there are, add a few more in for
+-	 * good measure and then allocate all the structures.  Then we'll
+-	 * verify that we have enough room when we go back in and get the
+-	 * mutex the second time.
++	 * Allocate after locking the region
++	 * to make sure the structures are large enough.
+ 	 */
+-retry:	count = region->stat.st_nlockers;
++	LOCK_LOCKERS(env, region);
++	count = region->stat.st_nlockers;
+ 	if (count == 0) {
++		UNLOCK_LOCKERS(env, region);
+ 		*nlockers = 0;
+ 		return (0);
+ 	}
+@@ -448,50 +462,37 @@ retry:	count = region->stat.st_nlockers;
+ 	if (FLD_ISSET(env->dbenv->verbose, DB_VERB_DEADLOCK))
+ 		__db_msg(env, "%lu lockers", (u_long)count);
+ 
+-	count += 20;
+ 	nentries = (u_int32_t)DB_ALIGN(count, 32) / 32;
+ 
+-	/*
+-	 * Allocate enough space for a count by count bitmap matrix.
+-	 *
+-	 * XXX
+-	 * We can probably save the malloc's between iterations just
+-	 * reallocing if necessary because count grew by too much.
+-	 */
++	/* Allocate enough space for a count by count bitmap matrix. */
+ 	if ((ret = __os_calloc(env, (size_t)count,
+-	    sizeof(u_int32_t) * nentries, &bitmap)) != 0)
++	    sizeof(u_int32_t) * nentries, &bitmap)) != 0) {
++		UNLOCK_LOCKERS(env, region);
+ 		return (ret);
++	}
+ 
+ 	if ((ret = __os_calloc(env,
+ 	    sizeof(u_int32_t), nentries, &tmpmap)) != 0) {
++		UNLOCK_LOCKERS(env, region);
+ 		__os_free(env, bitmap);
+ 		return (ret);
+ 	}
+ 
+ 	if ((ret = __os_calloc(env,
+ 	    (size_t)count, sizeof(locker_info), &id_array)) != 0) {
++		UNLOCK_LOCKERS(env, region);
+ 		__os_free(env, bitmap);
+ 		__os_free(env, tmpmap);
+ 		return (ret);
+ 	}
+ 
+ 	/*
+-	 * Now go back in and actually fill in the matrix.
+-	 */
+-	if (region->stat.st_nlockers > count) {
+-		__os_free(env, bitmap);
+-		__os_free(env, tmpmap);
+-		__os_free(env, id_array);
+-		goto retry;
+-	}
+-
+-	/*
+ 	 * First we go through and assign each locker a deadlock detector id.
+ 	 */
+ 	id = 0;
+-	LOCK_LOCKERS(env, region);
+ 	SH_TAILQ_FOREACH(lip, &region->lockers, ulinks, __db_locker) {
+ 		if (lip->master_locker == INVALID_ROFF) {
++			DB_ASSERT(env, id < count);
+ 			lip->dd_id = id++;
+ 			id_array[lip->dd_id].id = lip->id;
+ 			switch (atype) {
+@@ -510,7 +511,6 @@ retry:	count = region->stat.st_nlockers;
+ 			lip->dd_id = DD_INVALID_ID;
+ 
+ 	}
+-	UNLOCK_LOCKERS(env, region);
+ 
+ 	/*
+ 	 * We only need consider objects that have waiters, so we use
+@@ -669,7 +669,6 @@ again:		memset(bitmap, 0, count * sizeof
+ 	 * status after building the bit maps so that we will not detect
+ 	 * a blocked transaction without noting that it is already aborting.
+ 	 */
+-	LOCK_LOCKERS(env, region);
+ 	for (id = 0; id < count; id++) {
+ 		if (!id_array[id].valid)
+ 			continue;
+@@ -738,6 +737,7 @@ get_lock:		id_array[id].last_lock = R_OF
+ 			id_array[id].in_abort = 1;
+ 	}
+ 	UNLOCK_LOCKERS(env, region);
++	LOCK_SYSTEM_UNLOCK(lt, region);
+ 
+ 	/*
+ 	 * Now we can release everything except the bitmap matrix that we
+@@ -839,6 +839,7 @@ __dd_abort(env, info, statusp)
+ 	ret = 0;
+ 
+ 	/* We must lock so this locker cannot go away while we abort it. */
++	LOCK_SYSTEM_LOCK(lt, region);
+ 	LOCK_LOCKERS(env, region);
+ 
+ 	/*
+@@ -895,6 +896,7 @@ __dd_abort(env, info, statusp)
+ done:	OBJECT_UNLOCK(lt, region, info->last_ndx);
+ err:
+ out:	UNLOCK_LOCKERS(env, region);
++	LOCK_SYSTEM_UNLOCK(lt, region);
+ 	return (ret);
+ }
+