diff options
| 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/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h | |
| parent | 155ee340b875834693fbd1b7401af7fe88ace04d (diff) | |
[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/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h b/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h index 406c290d71..17e63c6901 100644 --- a/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h +++ b/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h @@ -88,6 +88,19 @@ INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \ }) +#define lll_futex_timed_wait_bitset(futexp, val, timespec, clockbit, private) \ + ({ \ + INTERNAL_SYSCALL_DECL (__err); \ + long int __ret; \ + int __op = FUTEX_WAIT_BITSET | clockbit; \ + \ + __ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \ + __lll_private_flag (__op, private), \ + (val), (timespec), NULL /* Unused. */, \ + FUTEX_BITSET_MATCH_ANY); \ + INTERNAL_SYSCALL_ERROR_P (__ret, __err) ? -__ret : __ret; \ + }) + #define lll_futex_wake(futexp, nr, private) \ ({ \ INTERNAL_SYSCALL_DECL (__err); \ |