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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-06-24 09:35:44 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-06-24 09:42:15 +0200 |
| commit | 6c38ce7f1f52ed566d71426a428efeb12f837c0b (patch) | |
| tree | 6f81bdddfd0133980daa6df25adaadae74e6eb5b | |
| parent | 84abf4ba9793d5b8fedd49efbc08bc9f9a644168 (diff) | |
| download | man-pages-6c38ce7f1f52ed566d71426a428efeb12f837c0b.tar.gz | |
futex.2: Note that at least one bit must be set in mask for BITSET operations
At least one bit must be set in the 'val3' mask supplied for the
FUTEX_WAIT_BITSET and FUTEX_WAKE_BITSET operations.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man2/futex.2 | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/man2/futex.2 b/man2/futex.2 index 7e065e7ab6..5146a1146c 100644 --- a/man2/futex.2 +++ b/man2/futex.2 @@ -694,7 +694,8 @@ This operation is like except that .I val3 is used to provide a 32-bit bit mask to the kernel. -This bit mask is stored in the kernel-internal state of the waiter. +This bit mask, in which at least one bit must be set, +is stored in the kernel-internal state of the waiter. See the description of .BR FUTEX_WAKE_BITSET for further details. @@ -722,7 +723,8 @@ This operation is the same as except that the .I val3 argument is used to provide a 32-bit bit mask to the kernel. -This bit mask is used to select which waiters should be woken up. +This bit mask, in which at least one bit must be set, +is used to select which waiters should be woken up. The selection is done by a bit-wise AND of the "wake" bit mask (i.e., the value in .IR val3 ) |