Discussion:
RE24 testing call #3 (2.4.43) LMDB RE0.9 testing call #3 (0.9.17)
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Howard Chu
2015-11-11 09:49:49 UTC
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Content preview: Volker Lendecke wrote: > On Wed, Nov 11, 2015 at 12:09:51AM
+0000, Howard Chu wrote: >> Unfortunately, PTHREAD_MUTEX_ROBUST_NP is an
enum, not a macro, so >> #ifdef won't work to detect it. >> >> The attached
patch should work. Please report back; I won't merge it >> unless we know
it actually helps. > > Not sure you're aware, but there's RHEL5 (and thus
Centos5 I > believe) versions where glibc announces robust mutexes but >
the kernel is buggy: They are just not robust. tdb has a > runtime check for
this. Are you interested? [...]

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Unfortunately, PTHREAD_MUTEX_ROBUST_NP is an enum, not a macro, so
#ifdef won't work to detect it.
The attached patch should work. Please report back; I won't merge it
unless we know it actually helps.
Not sure you're aware, but there's RHEL5 (and thus Centos5 I
believe) versions where glibc announces robust mutexes but
the kernel is buggy: They are just not robust. tdb has a
runtime check for this. Are you interested?
Sure, post a link to more info.

I found this since you mentioned it.

https://bugzilla.redhat.com/show_bug.cgi?id=628608

But it only affects a mutex that was locked in a process that subsequently
forks a child. The LMDB docs already say explicitly that a process must not
fork with an open LMDB environment so this particular issue doesn't affect us.
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/
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