TMultiReadExclusiveWriteSynchronizer for android/ios

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On all platforms (except windows) TMultiReadExclusiveWriteSynchronizer is a TSimpleRWSync that internally simply use Tmonitor.enter / Tmonitor.exit and this is quite bad because only one read access at a time. Is their any equivalent of TMultiReadExclusiveWriteSynchronizer (windows version) that work on Android/iOS ?

firemonkey delphi
1 Answers

There is TLightweightMREW record in System.SyncObjs fully implemented on all platforms as thin wrapper around native OS implementations. Introduced in 10.4.1 Sydney.

There are some things to keep in mind:

  • Read access can be called recursively from same thread, but write access cannot - it will deadlock on Windows and raise exception on Posix platforms
  • Read access cannot be upgraded to write access.
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