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Upstream x86_64 uses the generic lll_futex_timed_wait_bitset, but for
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rhel-7 we have not yet backported the larger generic futex cleanups.
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00db10 |
To keep x86_64 using the tested code paths we add a generic
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lll_futex_timed_wait_bitset. We do not do the same for i686, where we
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let the code use the lll_futex_timed_wait fallback. For i686 it would
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be harder to add lll_futex_timed_wait_bitset because it requires more
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complex 6-argument syscall handling backports, so we do not do that.
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00db10 |
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Not needed upstream.
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00db10 |
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00db10 |
Index: glibc-2.17-c758a686/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h
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===================================================================
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--- glibc-2.17-c758a686.orig/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h
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+++ glibc-2.17-c758a686/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h
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@@ -223,6 +223,20 @@ LLL_STUB_UNWIND_INFO_END
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__status; \
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})
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+#define lll_futex_timed_wait_bitset(futexp, val, timespec, clockbit, private) \
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+ ({ \
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+ INTERNAL_SYSCALL_DECL (__err); \
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+ long int __ret; \
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+ int __op = FUTEX_WAIT_BITSET | clockbit; \
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+ \
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+ __ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \
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+ __lll_private_flag (__op, private), \
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+ (val), (timespec), NULL /* Unused. */, \
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+ FUTEX_BITSET_MATCH_ANY); \
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+ (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (__ret, __err)) \
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+ ? -INTERNAL_SYSCALL_ERRNO (__ret, __err) : 0); \
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+ })
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+
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#define lll_futex_wake(futex, nr, private) \
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({ \
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