This RFE is filed to track the improvement work for Linux sync primitives.

Motivations behind this work include,

+ Better performance. Initial test results are quite favorable for the
  surrogate sync subsystem. In addition to better throughput under
  contention, it has better latency for simple lock-unlock operations.

+ Decouple VM from LinuxThreads a little bit more. LinuxThreads are buggy
  and constantly changing. Controling condvar- and mutex sync primitives
  could help the overall reliability.

+ Make the sync primitives suspend-signal friendly. This would help both
  reliability and performance.