[v3,1/4] Linux: Add FUTEX_LOCK_PI2
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Commit Message
From: Kurt Kanzenbach <kurt@linutronix.de>
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>
---
sysdeps/unix/sysv/linux/kernel-features.h | 8 ++++++++
1 file changed, 8 insertions(+)
@@ -220,4 +220,12 @@
# 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 */