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Linux: Add FUTEX_LOCK_PI2

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Linux v5.14.0 introduced a new futex operation called FUTEX_LOCK_PI2.

This kernel feature can be used to implement
pthread_mutex_clocklock(MONOTONIC)/PI.

Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Kurt Kanzenbach
2021-06-25 10:10:59 +02:00
committed by Adhemerval Zanella
parent 01d34e934a
commit dd5adb515c
1 changed files with 8 additions and 0 deletions
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8
sysdeps/unix/sysv/linux/kernel-features.h
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@ -220,4 +220,12 @@
# define __ASSUME_FACCESSAT2 0 # define __ASSUME_FACCESSAT2 0
#endif #endif
/* The FUTEX_LOCK_PI2 operation was introduced across all architectures in Linux
5.14. */
#if __LINUX_KERNEL_VERSION >= 0x050e00
# define __ASSUME_FUTEX_LOCK_PI2 1
#else
# define __ASSUME_FUTEX_LOCK_PI2 0
#endif
#endif /* kernel-features.h */ #endif /* kernel-features.h */