[jdk11u-dev] RFR: 8252248: __SIGRTMAX is not declared in musl libc

[Aleksei Voitylov]

JDK-8252248 is in the first batch of a chain of backports for Alpine support to 11u as discussed in the mailing list. For the full set of anticipated changes please refer to the jdk-updates mailing list [1].

Compared to original changeset this backport looks cosmetically different in #ifdefs in NativeThread.c because of another code layout due to "8244224: Implementation of JEP 381: Remove the Solaris and SPARC Ports".

Testing: JCK + JTreg on Windows, Linux, Solaris, Mac without regressions.

[1] https://mail.openjdk.java.net/pipermail/jdk-updates-dev/2022-February/012271.html

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Commit messages:
 - backport of JDK-8252248 to 11u

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/850/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=850&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252248
  Stats: 5 lines in 2 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/850.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/850/head:pull/850

PR: https://git.openjdk.java.net/jdk11u-dev/pull/850