[crac] RFR: Wake up all TIMED_WAITING threads after restore

[Radim Vansa]

This is a fix for an issue found by @jankratochvil when testing #53: Threads that enter sleep or timed parking use absolute monotonic time for pthread_cond_wait(). When the monotonic time changes during C/R we need to wake all threads to readjust the timeout to the new absolute time.

This introduces effectively a spurious wakeup; this is permitted for all the uses of pthread_timed_wait. Implementation either handles that transparently or propagates the wakeup to Java.

This commit does not handle timed waiting in non-Java threads other than WatcherThread.

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Commit messages:
 - Wake up all TIMED_WAITING threads after restore

Changes: https://git.openjdk.org/crac/pull/85/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=85&range=00
  Stats: 236 lines in 2 files changed: 236 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/crac/pull/85.diff
  Fetch: git fetch https://git.openjdk.org/crac.git pull/85/head:pull/85

PR: https://git.openjdk.org/crac/pull/85