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| author | Thomas Gleixner <tglx@linutronix.de> | 2008-11-20 10:02:53 -0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-11-24 20:00:40 +0100 |
| commit | 1acdac104668a0834cfa267de9946fac7764d486 (patch) | |
| tree | bae8ffeb2425412c0bffbdf728b45104fe3178f2 /include/linux/futex.h | |
| parent | 3e1d7a6219ab64e13b10b1a77c0625db9a8bd8db (diff) | |
| download | lwn-1acdac104668a0834cfa267de9946fac7764d486.tar.gz lwn-1acdac104668a0834cfa267de9946fac7764d486.zip | |
futex: make clock selectable for FUTEX_WAIT_BITSET
FUTEX_WAIT_BITSET could be used instead of FUTEX_WAIT by setting the
bit set to FUTEX_BITSET_MATCH_ANY, but FUTEX_WAIT uses CLOCK_REALTIME
while FUTEX_WAIT_BITSET uses CLOCK_MONOTONIC.
Add a flag to select CLOCK_REALTIME for FUTEX_WAIT_BITSET so glibc can
replace the FUTEX_WAIT logic which needs to do gettimeofday() calls
before and after the syscall to convert the absolute timeout to a
relative timeout for FUTEX_WAIT.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ulrich Drepper <drepper@redhat.com>
Diffstat (limited to 'include/linux/futex.h')
| -rw-r--r-- | include/linux/futex.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/futex.h b/include/linux/futex.h index 8f627b9ae2b1..3bf5bb5a34f9 100644 --- a/include/linux/futex.h +++ b/include/linux/futex.h @@ -25,7 +25,8 @@ union ktime; #define FUTEX_WAKE_BITSET 10 #define FUTEX_PRIVATE_FLAG 128 -#define FUTEX_CMD_MASK ~FUTEX_PRIVATE_FLAG +#define FUTEX_CLOCK_REALTIME 256 +#define FUTEX_CMD_MASK ~(FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME) #define FUTEX_WAIT_PRIVATE (FUTEX_WAIT | FUTEX_PRIVATE_FLAG) #define FUTEX_WAKE_PRIVATE (FUTEX_WAKE | FUTEX_PRIVATE_FLAG) |