[jdk11u-dev] RFR: 8236177: assert(status == 0) failed: error ETIMEDOUT(60), cond_wait

[Aleksey Shipilev]

Unclean backport: some of `pthread_cond_wait` uses are not present in 11u (added later by JDK-8210832), I ignored them.

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Commit messages:
 - Backport 91ed3fc599583270d180c44efc3f1793dfa69325

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/257/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=257&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8236177
  Stats: 12 lines in 2 files changed: 10 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/257.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/257/head:pull/257

PR: https://git.openjdk.java.net/jdk11u-dev/pull/257