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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-06-24 10:00:25 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-06-26 11:25:11 +0200 |
| commit | 678c99868e1d3668eb290acd55432e3e35d1e122 (patch) | |
| tree | 8c2ead06ba752ed2d9bc79a9fd9e2879c15640de | |
| parent | 6c38ce7f1f52ed566d71426a428efeb12f837c0b (diff) | |
| download | man-pages-678c99868e1d3668eb290acd55432e3e35d1e122.tar.gz | |
futex.2: Describe FUTEX_BITSET_MATCH_ANY
Describe FUTEX_BITSET_MATCH_ANY and FUTEX_WAIT and FUTEX_WAKE
equivalences.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man2/futex.2 | 39 |
1 files changed, 29 insertions, 10 deletions
diff --git a/man2/futex.2 b/man2/futex.2 index 5146a1146c..671b9edb9e 100644 --- a/man2/futex.2 +++ b/man2/futex.2 @@ -761,21 +761,40 @@ including those that are not interested in being woken up .\" for efficiently implementing Pthreads APIs (which use absolute .\" timeouts); FUTEX_WAIT provides only relative timeouts. -The -.I uaddr2 +The constant +.BR FUTEX_BITSET_MATCH_ANY , +which corresponds to all 32 bits set in the bit mask, can be used as the +.I val3 +argument for +.BR FUTEX_WAIT_BITSET and +.BR FUTEX_WAKE_BITSET . +Other than differences in the handling of the .I timeout -arguments are ignored. - -The +argument, the .BR FUTEX_WAIT -and -.BR FUTEX_WAKE -operations correspond to +operation is equivalent to .BR FUTEX_WAIT_BITSET -and +with +.IR val3 +specified as +.BR FUTEX_BITSET_MATCH_ANY ; +that is, allow a wake-up by any waker. +The +.BR FUTEX_WAKE +operation is equivalent to .BR FUTEX_WAKE_BITSET -operations where the bit masks are all ones. +with +.IR val3 +specified as +.BR FUTEX_BITSET_MATCH_ANY ; +that is, wake up any waiter(s). + +The +.I uaddr2 +and +.I timeout +arguments are ignored. .\" .\"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" .\" |