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authorThomas Gleixner <tglx@linutronix.de>2008-11-20 21:02:53 +0300
committerThomas Gleixner <tglx@linutronix.de>2008-11-24 22:00:40 +0300
commit1acdac104668a0834cfa267de9946fac7764d486 (patch)
treebae8ffeb2425412c0bffbdf728b45104fe3178f2 /include/linux/futex.h
parent3e1d7a6219ab64e13b10b1a77c0625db9a8bd8db (diff)
downloadlinux-1acdac104668a0834cfa267de9946fac7764d486.tar.xz
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.h3
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)