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| author | Siddhesh Poyarekar <siddhesh@redhat.com> | 2012-11-05 21:12:10 +0530 |
|---|---|---|
| committer | Siddhesh Poyarekar <siddhesh@redhat.com> | 2012-11-05 21:12:52 +0530 |
| commit | 8f861542dd0603bef99e126e509ece89514c1eeb (patch) | |
| tree | 083f3bd20edfa09a2341e0340013c0781b4696ad /nptl/ChangeLog | |
| parent | 155ee340b875834693fbd1b7401af7fe88ace04d (diff) | |
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[S390,PPC] Implement FUTEX_WAIT_BITSET for timedwait functions
Since the FUTEX_WAIT operation takes a relative timeout, the
pthread_cond_timedwait and other timed function implementations have
to get a relative timeout from the absolute timeout parameter it gets
before it makes the futex syscall. This value is then converted back
into an absolute timeout within the kernel. This is a waste and has
hence been improved upon by a FUTEX_WAIT_BITSET operation (OR'd with
FUTEX_CLOCK_REALTIME to make the kernel use the realtime clock instead
of the default monotonic clock). This was implemented only in the x86
and sh assembly code and not in the C code. This patch implements
support for FUTEX_WAIT_BITSET whenever available (since linux-2.6.29)
for s390 and powerpc.
Diffstat (limited to 'nptl/ChangeLog')
| -rw-r--r-- | nptl/ChangeLog | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/nptl/ChangeLog b/nptl/ChangeLog index a7b741f3ee..0e01675290 100644 --- a/nptl/ChangeLog +++ b/nptl/ChangeLog @@ -1,3 +1,20 @@ +2012-11-05 Siddhesh Poyarekar <siddhesh@redhat.com> + + * pthread_cond_timedwait.c (__pthread_cond_timedwait): Time out + if absolute timeout is negative. + [__ASSUME_FUTEX_CLOCK_REALTIME && + lll_futex_timed_wait_bitset]: Use lll_futex_timed_wait_bitset. + * pthread_rwlock_timedrdlock.c (pthread_rwlock_timedrdlock): + Likewise. + * pthread_rwlock_timedwrlock.c (pthread_rwlock_timedwrlock): + Likewise. + * sysdeps/unix/sysv/linux/lowlevelrobustlock.c + (__lll_robust_timedlock_wait): Likewise. + * sysdeps/unix/sysv/linux/powerpc/lowlevellock.h + (lll_futex_timed_wait_bitset): New macro. + * sysdeps/unix/sysv/linux/s390/lowlevellock.h + (lll_futex_timed_wait_bitset): Likewise. + 2012-11-03 David S. Miller <davem@davemloft.net> * sysdeps/unix/sysv/linux/sparc/lowlevellock.h (BUSY_WAIT_NOP): |