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How efficient is locking an unlocked mutex? What is the cost of a mutex?

... it again. The program that I used to investigate this can be found here: https://github.com/CarloWood/ai-statefultask-testsuite/blob/b69b112e2e91d35b56a39f41809d3e3de2f9e4b8/src/mutex_test.cxx Note that it has a few hardcoded values specific for my box (xrange, yrange and rdtsc overhead), so you ...
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Is C++ context-free or context-sensitive?

...possible, and a Type-0 grammar is provided in the answer to this question: https://math.stackexchange.com/questions/163830/context-sensitive-grammar-for-the-copy-language . If one were to attempt to write a context-sensitive (or unrestricted) grammar to parse C++, it would quite possibly fill the u...
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Is there a MySQL option/feature to track history of changes to records?

... fork of MySQL. You can find more on its System Versioning via this link: https://mariadb.com/kb/en/library/system-versioned-tables/ share | improve this answer | follow ...
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Passing Parameters JavaFX FXML

...ch is still valid and tested in March 2016, on Spring Boot v1.3.3.RELEASE: https://stackoverflow.com/a/36310391/1281217 Sometimes, you might want to pass results back to the caller, in which case you can check out the answer to the related question: JavaFX FXML Parameter passing from Controller A ...
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How do I get current date/time on the Windows command line in a suitable format for usage in a file/

...because of the regional settings issue with using date . See @npocmaka's https://stackoverflow.com/a/19799236/8479 28 Ans...
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Makefile经典教程(入门必备) - C/C++ - 清泛网 - 专注IT技能提升

...相信大家对这个人并不比我陌生,这是他的主页:http://www.stallman.org/ 。 第二位是:Roland McGrath 个人主页是:http://www.frob.com/~roland/ ,下面是他的一些事迹: 1) 合作编写了并维护GNU make。 2) 和Thomas Bushnell...
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Makefile经典教程(入门必备) - C/C++ - 清泛网 - 专注IT技能提升

...相信大家对这个人并不比我陌生,这是他的主页:http://www.stallman.org/ 。 第二位是:Roland McGrath 个人主页是:http://www.frob.com/~roland/ ,下面是他的一些事迹: 1) 合作编写了并维护GNU make。 2) 和Thomas Bushnell...
https://www.tsingfun.com/it/cp... 

Makefile经典教程(入门必备) - C/C++ - 清泛网 - 专注IT技能提升

...相信大家对这个人并不比我陌生,这是他的主页:http://www.stallman.org/ 。 第二位是:Roland McGrath 个人主页是:http://www.frob.com/~roland/ ,下面是他的一些事迹: 1) 合作编写了并维护GNU make。 2) 和Thomas Bushnell...
https://www.tsingfun.com/it/cp... 

Makefile经典教程(入门必备) - C/C++ - 清泛网 - 专注IT技能提升

...相信大家对这个人并不比我陌生,这是他的主页:http://www.stallman.org/ 。 第二位是:Roland McGrath 个人主页是:http://www.frob.com/~roland/ ,下面是他的一些事迹: 1) 合作编写了并维护GNU make。 2) 和Thomas Bushnell...
https://www.tsingfun.com/it/cp... 

Makefile经典教程(入门必备) - C/C++ - 清泛网 - 专注IT技能提升

...相信大家对这个人并不比我陌生,这是他的主页:http://www.stallman.org/ 。 第二位是:Roland McGrath 个人主页是:http://www.frob.com/~roland/ ,下面是他的一些事迹: 1) 合作编写了并维护GNU make。 2) 和Thomas Bushnell...