commit e73d9fcafbd07bc3714fbaf8a82db71d50015c92
author Ian Lance Taylor <iant@golang.org> Mon Sep 26 15:03:53 2022 -0400
committer Ian Lance Taylor <iant@golang.org> Tue Sep 27 09:30:23 2022 -0700
tree 44d8382e7696a4aa4ecbc6e116b2654775215402
parent f38162977e2b7efaa75233a0cba2a30a2b7f5132

runtime: portable access to sigev_notify_thread_id

Previously, libgo relied on the _sigev_un implementation-specific
field in struct sigevent, which is only available on glibc.
This patch uses the sigev_notify_thread_id macro instead which is
mandated by timer_create(2). In theory, this should work with any libc
implementation for Linux. Unfortunately, there is an open glibc bug
as glibc does not define this macro. For this reason, a glibc-specific
workaround is required. Other libcs (such as musl) define the macro
and don't require the workaround.

See https://sourceware.org/bugzilla/show_bug.cgi?id=27417

This makes libgo compatible with musl libc.

Based on patch by Sören Tempel.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/434755