[v1,1/6] Linux: Add FUTEX_LOCK_PI2
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Commit Message
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>
---
sysdeps/unix/sysv/linux/kernel-features.h | 8 ++++++++
1 file changed, 8 insertions(+)
Comments
On 25/06/2021 05:10, Kurt Kanzenbach wrote:
> 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>
The __LINUX_KERNEL_VERSION looks fine now.
You will need to check with Carlos O'Donell if this is suitable for 2.34.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
> ---
> sysdeps/unix/sysv/linux/kernel-features.h | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
> index 1680b10ca1b6..af4b2b304715 100644
> --- a/sysdeps/unix/sysv/linux/kernel-features.h
> +++ b/sysdeps/unix/sysv/linux/kernel-features.h
> @@ -218,4 +218,12 @@
> # define __ASSUME_FACCESSAT2 0
> #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 */
>
@@ -218,4 +218,12 @@
# define __ASSUME_FACCESSAT2 0
#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 */