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Date: Sun, 3 Jun 2018 13:03:21 -0700 (PDT)
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Subject: Re: Interfaces.C.Strings chars_ptr memory management strategy
From: ytomino <aghia05@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:52890
Date: 2018-06-03T13:03:21-07:00
List-Id: <comp.lang.ada>

On Monday, June 4, 2018 at 4:33:20 AM UTC+9, Dmitry A. Kazakov wrote:
> On 2018-06-03 20:31, ytomino wrote:
> > Perhaps, malloc is better than New_String in this case.
> > 
> >   function malloc (s : Interfaces.C.size_t) return Interfaces.C.Strings.chars_ptr
> >      with Import, Convention => C;
> 
> I had a case when that caused the application crashed.
> 
> I guess it was because of mixed Visual Studio and GCC run-times. The 
> pointer returned by the malloc from one was freed in a third-party C 
> library by another.
> 
> -- 
> Regards,
> Dmitry A. Kazakov
> http://www.dmitry-kazakov.de

What!?

New_String calls malloc in the end, too, in mingw runtime.
(It calls Memory_Alloc, Memory_Alloc is _gnat_malloc, and __gnat_malloc calls malloc.)
https://gcc.gnu.org/svn/gcc/trunk/gcc/ada/libgnat/i-cstrin.adb
https://gcc.gnu.org/svn/gcc/trunk/gcc/ada/libgnat/s-parame.ads
https://gcc.gnu.org/svn/gcc/trunk/gcc/ada/libgnat/s-memory__mingw.adb

If Interfaces.C.Strings.Free (malloc) is crashed, New_String would be same.