percona-discussion team mailing list archive

[Yasufumi Kinoshita <yasufumi.kinoshita@xxxxxxxxxxx>]

I should port the stable rw_lock of XtraDB-1.0.3 to percona-patches.

** Changed in: percona-patches
       Status: Fix Committed => In Progress

-- 
rw_lock still has possibility to hangup
https://bugs.launchpad.net/bugs/333750
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Status in Patches for MySQL by Percona: In Progress
Status in Percona XtraDB Storage Engine for MySQL: Fix Released

Bug description:
rw_lock implementation may still have possibility to hangup

--Thread 1409067328 has waited at ../../storage/innobase/include/btr0btr.ic line 31 for 7.00 seconds the semaphore:
X-lock on RW-latch at 0x7f1b0bf3cab8 created in file buf/buf0buf.c line 810
a writer (thread id 1409067328) has reserved it in mode  wait exclusive
number of readers 0, s_waiters flag 1, x_waiters flag 1
Last time read locked in file not yet reserved line 0
Last time write locked in file btr/btr0cur.c line 467

or

--Thread 1397074240 has waited at btr/btr0cur.c line 418 for 0.00 seconds the semaphore:
S-lock on RW-latch at 0x7f8ef9292138 created in file dict/dict0dict.c line 1541
number of readers 0, s_waiters flag 0, x_waiters flag 0
Last time read locked in file btr/btr0cur.c line 418
Last time write locked in file btr/btr0cur.c line 411