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Prevent priority inversion in locking by checking for existing locks
before going into queue behind person with higher piority.
This commit is contained in:
Bruce Momjian
parent
7d62e9c719
commit
52f1b2f3b6
7
HISTORY
7
HISTORY
@ -1,3 +1,10 @@
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PostgreSQL 6.5 Fri Apr 23 17:40:19 EDT 1999
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=========================================================
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A dump/restore is required.
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PLACE HOLDER
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PostgreSQL 6.4.2 Sat Jan 2 11:04:05 EST 1999
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=========================================================
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@ -4,7 +4,7 @@
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<Abstract>
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<Para>
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Complete installation instructions for
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<ProductName>Postgres</ProductName> v6.4.
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<ProductName>Postgres</ProductName> v6.5.
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</Para>
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</Abstract>
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@ -167,8 +167,8 @@ remaining steps in the installation will happen in this account.
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<Step Performance="required">
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<Para>
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Ftp file
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<ulink url="ftp://ftp.postgresql.org/pub/postgresql-v6.4.tar.gz">
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<filename>ftp://ftp.postgresql.org/pub/postgresql-v6.4.tar.gz</filename></ulink>
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<ulink url="ftp://ftp.postgresql.org/pub/postgresql-v6.5.tar.gz">
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<filename>ftp://ftp.postgresql.org/pub/postgresql-v6.5.tar.gz</filename></ulink>
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from the Internet. Store it in your home directory.
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</Para>
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</Step>
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@ -268,7 +268,7 @@ from the new distribution:
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<ProgramListing>
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$ cd
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$ gunzip -c postgresql-v6.4.tar.gz \
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$ gunzip -c postgresql-v6.5.tar.gz \
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| tar xvf - src/bin/pg_dump/pg_dumpall
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$ chmod a+x src/bin/pg_dump/pg_dumpall
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$ src/bin/pg_dump/pg_dumpall -z > db.out
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@ -411,7 +411,7 @@ $ exit
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Unzip and untar the new source file. Type
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<ProgramListing>
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$ cd /usr/src/pgsql
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$ gunzip -c ~/postgresql-v6.4.tar.gz | tar xvf -
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$ gunzip -c ~/postgresql-v6.5.tar.gz | tar xvf -
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</ProgramListing>
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</Para>
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</Step>
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@ -989,17 +989,7 @@ For example,
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<listitem>
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<Para>
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For a i686/Linux-ELF platform, no tests failed since this is the
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v6.4 regression testing reference platform.
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</Para>
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</listitem>
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<listitem>
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<Para>
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For the SPARC/Linux-ELF platform, using the 970525 beta version of
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<ProductName>Postgres</ProductName> v6.2 the following tests "failed":
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float8 and geometry "failed" due to minor precision differences in
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floating point numbers. select_views produces massively different output,
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but the differences are due to minor floating point differences.
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v6.5 regression testing reference platform.
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</Para>
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</listitem>
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@ -1109,11 +1099,11 @@ VACUUM;
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<Para>
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Clean up after yourself. Type
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<ProgramListing>
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$ rm -rf /usr/src/pgsql_6_0
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$ rm -rf /usr/local/pgsql_6_0
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$ rm -rf /usr/src/pgsql_6_5
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$ rm -rf /usr/local/pgsql_6_5
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# Also delete old database directory tree if it is not in
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# /usr/local/pgsql_6_0/data
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$ rm ~/postgresql-v6.2.1.tar.gz
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# /usr/local/pgsql_6_5/data
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$ rm ~/postgresql-v6.5.tar.gz
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</ProgramListing>
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</Para>
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</Step>
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@ -1160,7 +1150,7 @@ $ lpr -l -s -r manpage.hp
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<itemizedlist>
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<listitem>
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<para>
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The version of <ProductName>Postgres</ProductName> (v6.4, 6.3.2, beta 981014, etc.).
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The version of <ProductName>Postgres</ProductName> (v6.5, 6.4.2, beta 981014, etc.).
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</para>
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</listitem>
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@ -6,7 +6,7 @@
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# Copyright (c) 1998, Regents of the University of California
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#
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# IDENTIFICATION
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# $Header: /cvsroot/pgsql/src/Makefile.shlib,v 1.7 1999/03/14 16:02:57 momjian Exp $
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# $Header: /cvsroot/pgsql/src/Makefile.shlib,v 1.8 1999/04/30 02:04:49 momjian Exp $
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#
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#-------------------------------------------------------------------------
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lock.c,v 1.46 1999/03/06 21:17:44 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/lock.c,v 1.47 1999/04/30 02:04:50 momjian Exp $
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*
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* NOTES
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* Outside modules can create a lock table and acquire/release
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@ -820,13 +820,17 @@ LockResolveConflicts(LOCKMETHOD lockmethod,
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/* ------------------------
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* If someone with a greater priority is waiting for the lock,
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* do not continue and share the lock, even if we can. bjm
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* Don't do this if the process already has some locks, because
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* this could hold up other people waiting on our locks, causing
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* a priority inversion. bjm
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* ------------------------
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*/
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int myprio = LockMethodTable[lockmethod]->ctl->prio[lockmode];
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PROC_QUEUE *waitQueue = &(lock->waitProcs);
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PROC *topproc = (PROC *) MAKE_PTR(waitQueue->links.prev);
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if (waitQueue->size && topproc->prio > myprio)
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if (SHMQueueEmpty(lockQueue) && waitQueue->size &&
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topproc->prio > myprio)
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{
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XID_PRINT("LockResolveConflicts: higher priority proc waiting",
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result);
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@ -1595,7 +1599,7 @@ DeadLockCheck(SHM_QUEUE *lockQueue, LOCK *findlock, bool skip_check)
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*
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* The lock we are waiting for is already in MyProc->lockQueue so we
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* need to skip it here. We are trying to find it in someone
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* else's lockQueue.
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* else's lockQueue. bjm
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*/
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if (lock == findlock && !skip_check)
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return true;
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@ -1625,7 +1629,7 @@ DeadLockCheck(SHM_QUEUE *lockQueue, LOCK *findlock, bool skip_check)
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*
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* Basically, the test is, "Do we both hold some lock on
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* findlock, and we are both waiting in the lock
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* queue?"
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* queue?" bjm
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*/
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Assert(skip_check);
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@ -1672,7 +1676,7 @@ DeadLockCheck(SHM_QUEUE *lockQueue, LOCK *findlock, bool skip_check)
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* hold locks and are waiting. Now we check for
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* cases where we have two or more tables in a
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* deadlock. We do this by continuing to search
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* for someone holding a lock
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* for someone holding a lock bjm
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*/
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if (DeadLockCheck(&(proc->lockQueue), findlock, false))
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return true;
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.52 1999/03/28 20:32:26 vadim Exp $
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* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.53 1999/04/30 02:04:51 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -46,7 +46,7 @@
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* This is so that we can support more backends. (system-wide semaphore
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* sets run out pretty fast.) -ay 4/95
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*
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* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.52 1999/03/28 20:32:26 vadim Exp $
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* $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.53 1999/04/30 02:04:51 momjian Exp $
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*/
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#include <sys/time.h>
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#include <unistd.h>
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@ -516,8 +516,7 @@ ProcSleep(PROC_QUEUE *waitQueue,/* lock->waitProcs */
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* In a full queue, we would have a reader holding a lock, then a writer
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* gets the lock, then a bunch of readers, made up of readers who
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* could not share the first readlock because a writer was waiting,
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* and new readers arriving while the writer had the lock.
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*
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* and new readers arriving while the writer had the lock. bjm
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*/
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proc = (PROC *) MAKE_PTR(waitQueue->links.prev);
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