8 Commits

Author	SHA1	Message	Date
Joseph Myers	f7a9f785e5	Update copyright dates with scripts/update-copyrights.	2016-01-04 16:05:18 +00:00
Torvald Riegel	389fdf78b2	Do not violate mutex destruction requirements. ... POSIX and C++11 require that a thread can destroy a mutex if no other thread owns the mutex, is blocked on the mutex, or will try to acquire it in the future. After destroying the mutex, it can reuse or unmap the underlying memory. Thus, we must not access a mutex' memory after releasing it. Currently, we can load the private flag after releasing the mutex, which is fixed by this patch. See https://sourceware.org/bugzilla/show_bug.cgi?id=13690 for more background. We need to call futex_wake on the lock after releasing it, however. This is by design, and can lead to spurious wake-ups on unrelated futex words (e.g., when the mutex memory is reused for another mutex). This behavior is documented in the glibc-internal futex API and in recent drafts of the Linux kernel's futex documentation (see the draft_futex branch of git://git.kernel.org/pub/scm/docs/man-pages/man-pages.git).	2015-12-23 18:44:53 +01:00
Joseph Myers	b168057aaa	Update copyright dates with scripts/update-copyrights.	2015-01-02 16:29:47 +00:00
Torvald Riegel	d52c62df3d	Add comments for the generic lowlevellock implementation. ... Patch by Bernard Ogden <bernie.ogden@linaro.org>.	2014-12-15 22:49:29 +01:00
Bernard Ogden	4e75751cbb	Check value of futex before updating in __lll_timedlock ... 2014-08-12 Bernard Ogden <bernie.ogden@linaro.org> [BZ #16892] * sysdeps/nptl/lowlevellock.h (__lll_timedlock): Use atomic_compare_and_exchange_bool_acq rather than atomic_exchange_acq.	2014-08-12 12:57:27 +01:00
Roland McGrath	3df6f22e5f	Separate Linuxisms from lowlevellock.h, make a generic one	2014-07-15 15:23:06 -07:00
Roland McGrath	f4c4021bc0	Remove old stub lowlevellock.h file. It is not even useful as documentation.	2014-07-07 09:29:34 -07:00
Roland McGrath	08192659bb	Get rid of nptl/sysdeps/ entirely!	2014-07-07 09:28:38 -07:00