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roundmodenotthreadsafe's Introduction

A simple demo project to show that Delphi's SetRoundMode is not thread-safe.

Output:

Delphi non-thread-safe SetRoundMode:

MainThread init                def: 1332   current: 1372  RM: 0
MainThread after rmDown        def: 1772   current: 1772  RM: 1
Thread 00:59:59.999            def: 1772   current: 1772  RM: 1
MainThread after rmNearest     def: 1372   current: 1372  RM: 0
Thread 01:00:00.000            def: 1372   current: 1372  RM: 0

Custom thread-safe SetRoundMode:

MainThread init                def: 1372   current: 1372  RM: 0
MainThread after rmDown        def: 1372   current: 1772  RM: 1
Thread 01:00:00.000            def: 1372   current: 1372  RM: 0
MainThread after rmNearest     def: 1372   current: 1372  RM: 0
Thread 01:00:00.000            def: 1372   current: 1372  RM: 0

roundmodenotthreadsafe's People

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