[Issue 20859] New: Add overloads of core.sync.rwmutex.ReadWriteMutex.Reader/Writer.tryLock that take a timeout duration

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20859

          Issue ID: 20859
           Summary: Add overloads of
                    core.sync.rwmutex.ReadWriteMutex.Reader/Writer.tryLock
                    that take a timeout duration
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: n8sh.secondary at hotmail.com

Add overloads of core.sync.rwmutex.ReadWriteMutex.Reader/Writer.tryLock that
take a timeout duration. Efficient implementation requires access to private
fields of ReadWriteMutex.

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