[ruby-core:69526] [Ruby trunk - Bug #11185] [PATCH] openssl: use RB_GC_GUARD instead of volatile

Issue #11185 has been updated by Tomoyuki Chikanaga.

Backport changed from 2.0.0: REQUIRED, 2.1: DONE, 2.2: REQUIRED to 2.0.0: REQUIRED, 2.1: DONE, 2.2: DONE

Backported into `ruby_2_2` branch at r50837.

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Bug #11185: [PATCH] openssl: use RB_GC_GUARD instead of volatile
https://bugs.ruby-lang.org/issues/11185#change-52841

* Author: Eric Wong
* Status: Closed
* Priority: Normal
* Assignee: Eric Wong
* ruby -v: 
* Backport: 2.0.0: REQUIRED, 2.1: DONE, 2.2: DONE
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From doc/extension.rdoc:
>
> Using the RB_GC_GUARD macro is preferable to using the "volatile"
> keyword in C.  RB_GC_GUARD has the following advantages:
>
> 1) the intent of the macro use is clear
>
> 2) RB_GC_GUARD only affects its call site, "volatile" generates some
>    extra code every time the variable is used, hurting optimization.
>
> 3) "volatile" implementations may be buggy/inconsistent in some
>    compilers and architectures. RB_GC_GUARD is customizable for broken
>    systems/compilers without those without negatively affecting other
>    systems.


---Files--------------------------------
0001-openssl-use-RB_GC_GUARD-instead-of-volatile.patch (2.5 KB)


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