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Remove homegrown mutex implementation

Marius Gerbershagenrequested to merge
spaghettisalat/ecl:native-mutex into develop

All multithreading synchronization objects have been implemented on top of mutex and condition variable primitives from the operating system.

This merge request also includes

  • better tests (tests no longer use sleep for synchronization purposes, tests should no longer fail due to timing issues)
  • timeouts for condition variables and mutex locking operations (closes #90 (closed))
  • read-write locks are always provided (we use our own implementation if no OS rwlocks are available)
  • removal of spinlocks
  • finalizers for builtin objects are now run only when the object is unreachable from other finalizers. This prevents these finalizers from being run before another user-defined finalizer makes the object reachable again.

Since these changes are rather large, I think it makes sense to make another bugfix release before merging them. @jackdaniel: any progress on the review for !230 (merged) and !222 (closed)?

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