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nptl: Extend __futex_abstimed_wait_cancelable64 comment
And add a small optimization to avoid setting the operation for the 32-bit time fallback operation. Checked on x86_64-linux-gnu and i686-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
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@ -25,7 +25,7 @@
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#ifndef __ASSUME_TIME64_SYSCALLS
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static int
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__futex_abstimed_wait_cancelable32 (unsigned int* futex_word,
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unsigned int expected, clockid_t clockid,
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unsigned int expected, int op,
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const struct __timespec64* abstime,
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int private)
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{
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@ -39,10 +39,6 @@ __futex_abstimed_wait_cancelable32 (unsigned int* futex_word,
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pts32 = &ts32;
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}
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unsigned int clockbit = (clockid == CLOCK_REALTIME)
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? FUTEX_CLOCK_REALTIME : 0;
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int op = __lll_private_flag (FUTEX_WAIT_BITSET | clockbit, private);
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return INTERNAL_SYSCALL_CANCEL (futex, futex_word, op, expected,
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pts32, NULL /* Unused. */,
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FUTEX_BITSET_MATCH_ANY);
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@ -119,7 +115,7 @@ __futex_abstimed_wait_cancelable64 (unsigned int* futex_word,
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#ifndef __ASSUME_TIME64_SYSCALLS
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if (err == -ENOSYS)
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err = __futex_abstimed_wait_cancelable32 (futex_word, expected,
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clockid, abstime, private);
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op, abstime, private);
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#endif
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switch (err)
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@ -390,9 +390,17 @@ futex_unlock_pi (unsigned int *futex_word, int private)
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}
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}
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/* The futex_abstimed_wait_cancelable64 has been moved to a separate file
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to avoid problems with exhausting available registers on some architectures
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- e.g. on m68k architecture. */
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/* Like futex_wait, but will eventually time out (i.e., stop being blocked)
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after the duration of time provided (i.e., ABSTIME) has passed using the
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clock specified by CLOCKID (currently only CLOCK_REALTIME and
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CLOCK_MONOTONIC, the ones support by lll_futex_supported_clockid). ABSTIME
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can also equal NULL, in which case this function behaves equivalent to
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futex_wait.
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Returns the same values as futex_wait under those same conditions;
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additionally, returns ETIMEDOUT if the timeout expired.
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The call acts as a cancellation entrypoint. */
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int
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__futex_abstimed_wait_cancelable64 (unsigned int* futex_word,
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unsigned int expected, clockid_t clockid,
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