Commit Graph

7 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
a2f0363f81 Add and use new glibc-internal futex API.
This adds new functions for futex operations, starting with wait,
abstimed_wait, reltimed_wait, wake.  They add documentation and error
checking according to the current draft of the Linux kernel futex manpage.

Waiting with absolute or relative timeouts is split into separate functions.
This allows for removing a few cases of code duplication in pthreads code,
which uses absolute timeouts; also, it allows us to put platform-specific
code to go from an absolute to a relative timeout into the platform-specific
futex abstractions..

Futex operations that can be canceled are also split out into separate
functions suffixed by "_cancelable".

There are separate versions for both Linux and NaCl; while they currently
differ only slightly, my expectation is that the separate versions of
lowlevellock-futex.h will eventually be merged into futex-internal.h
when we get to move the lll_ functions over to the new futex API.
2015-07-10 13:47:09 +02:00
Roland McGrath
88ed594f5d BZ#18434: Fix sem_post EOVERFLOW check for [!__HAVE_64B_ATOMICS]. 2015-05-19 15:04:41 -07:00
H.J. Lu
22971c35e2 Use uint64_t and (uint64_t) 1 for 64-bit int
This patch replaces unsigned long int and 1UL with uint64_t and
(uint64_t) 1 to support ILP32 targets like x32.

	[BZ #17870]
	* nptl/sem_post.c (__new_sem_post): Replace unsigned long int
	with uint64_t.
	* nptl/sem_waitcommon.c (__sem_wait_cleanup): Replace 1UL with
	(uint64_t) 1.
	(__new_sem_wait_slow): Replace unsigned long int with uint64_t.
	Replace 1UL with (uint64_t) 1.
	* sysdeps/nptl/internaltypes.h (new_sem): Replace unsigned long
	int with uint64_t.
2015-01-23 14:48:40 -08:00
Carlos O'Donell
042e1521c7 Fix semaphore destruction (bug 12674).
This commit fixes semaphore destruction by either using 64b atomic
operations (where available), or by using two separate fields when only
32b atomic operations are available.  In the latter case, we keep a
conservative estimate of whether there are any waiting threads in one
bit of the field that counts the number of available tokens, thus
allowing sem_post to atomically both add a token and determine whether
it needs to call futex_wake.

See:
https://sourceware.org/ml/libc-alpha/2014-12/msg00155.html
2015-01-21 00:46:16 -05:00
Joseph Myers
b168057aaa Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
Roland McGrath
08192659bb Get rid of nptl/sysdeps/ entirely! 2014-07-07 09:28:38 -07:00