runtime: use futexes with 64-bit time on Linux Linux introduced new syscalls to fix the year 2038 issue. To still be able to use the old ones, the Kconfig option COMPAT_32BIT_TIME would be necessary. Use the new syscall with 64-bit values for futex by default. Define _ENOSYS for detecting if it's not available. Add a fallback to use the older syscall in case the new one is not available, since Go runs on Linux from 2.6.32 on, per https://go.dev/wiki/MinimumRequirements. Updates #75133 Change-Id: I65daff0a3d06b55440ff05d8f5a9aa1c07eb201d GitHub-Last-Rev: 96dd1bd84bd12d898e971157fc83da562cc4f6b4 GitHub-Pull-Request: golang/go#75306 Reviewed-on: https://go-review.googlesource.com/c/go/+/701615 Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Mark Freeman <markfreeman@google.com> Reviewed-by: Jorropo <jorropo.pgm@gmail.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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