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* [Bug nptl/14304] New: Provide some parts of librt in libc as well
@ 2012-06-27 15:00 ajax at redhat dot com
2013-01-15 14:35 ` [Bug nptl/14304] " schwab@linux-m68k.org
2014-06-18 4:31 ` fweimer at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: ajax at redhat dot com @ 2012-06-27 15:00 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14304
Bug #: 14304
Summary: Provide some parts of librt in libc as well
Product: glibc
Version: 2.13
Status: NEW
Severity: enhancement
Priority: P2
Component: nptl
AssignedTo: unassigned@sourceware.org
ReportedBy: ajax@redhat.com
CC: drepper.fsp@gmail.com
Classification: Unclassified
librt links against libpthread, mostly because aio_* are implemented in threads
instead of in the kernel AFAICT. This is unfortunate, because many libraries
would like to use (for example) clock_gettime, but doing so pulls in pthreads.
Now you have no choice but to hit the more expensive thread-safe paths, because
your library can't know whether multiple threads actually exist, only whether
the pthread symbols are non-zero.
The complementary problem also exists for applications that are unthreaded: if
they link against librt, pthread symbols will be non-zero, and any thread-safe
library beneath that app now has to behave thread-safely.
This is especially comic when reading the clock_gettime implementation, which
goes out of its way to work correctly regardless of whether
__pthread_clock_gettime is available.
Ideally it would be possible to provide most of these symbols from libc
directly (presumably versioned so the app requires a sufficiently new libc).
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* [Bug nptl/14304] Provide some parts of librt in libc as well
2012-06-27 15:00 [Bug nptl/14304] New: Provide some parts of librt in libc as well ajax at redhat dot com
@ 2013-01-15 14:35 ` schwab@linux-m68k.org
2014-06-18 4:31 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: schwab@linux-m68k.org @ 2013-01-15 14:35 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14304
Andreas Schwab <schwab@linux-m68k.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |DUPLICATE
--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> 2013-01-15 14:34:56 UTC ---
The clock_* function have been moved to libc.
*** This bug has been marked as a duplicate of bug 14743 ***
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* [Bug nptl/14304] Provide some parts of librt in libc as well
2012-06-27 15:00 [Bug nptl/14304] New: Provide some parts of librt in libc as well ajax at redhat dot com
2013-01-15 14:35 ` [Bug nptl/14304] " schwab@linux-m68k.org
@ 2014-06-18 4:31 ` fweimer at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: fweimer at redhat dot com @ 2014-06-18 4:31 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=14304
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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2012-06-27 15:00 [Bug nptl/14304] New: Provide some parts of librt in libc as well ajax at redhat dot com
2013-01-15 14:35 ` [Bug nptl/14304] " schwab@linux-m68k.org
2014-06-18 4:31 ` fweimer at redhat dot com
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