[jira] Commented: (STDCXX-20) [Cygwin] madvise() needs a config test

["Farid Zaripov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/STDCXX-20?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12523858 ] 

Farid Zaripov commented on STDCXX-20:
-------------------------------------

Cygwin has posix_madvise() function:

/usr/include/sys/mman.h:
...
extern int posix_madvise (void *__addr, size_t __len, int __advice);
...

Here is the information about the function:
http://www.opengroup.org/onlinepubs/000095399/functions/posix_madvise.html

Interesting that www.opengroup.org knows nothing about madvise(). There no page
http://www.opengroup.org/onlinepubs/000095399/functions/madvise.html and
madvise() not mentioned at page with description of sys/mman.h:
http://www.opengroup.org/onlinepubs/000095399/basedefs/sys/mman.h.html

Below is a part of the mman.h on RedHat Enterprise Linux 4:
------------
#ifdef __USE_BSD
/* Advise the system about particular usage patterns the program follows
   for the region starting at ADDR and extending LEN bytes.  */
extern int madvise (void *__addr, size_t __len, int __advice) __THROW;
#endif
#ifdef __USE_XOPEN2K
/* This is the POSIX name for this function.  */
extern int posix_madvise (void *__addr, size_t __len, int __advice) __THROW;
#endif
------------

By default the both functions are defined.

Since posix_madvise() is always defined (I suppose that is true), perhaps we should use it instead of madvise() ?

> [Cygwin] madvise() needs a config test
> --------------------------------------
>
>                 Key: STDCXX-20
>                 URL: https://issues.apache.org/jira/browse/STDCXX-20
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: Configuration
>    Affects Versions: 4.1.2, 4.1.3, 4.1.4
>         Environment: Cygwin
>            Reporter: Martin Sebor
>            Priority: Minor
>             Fix For: 4.2
>
>
> From http://mail-archives.apache.org/mod_mbox/incubator-stdcxx-dev/200509.mbox/%3c200509111213.j8BCDGMG006690@ms-smtp-03.rdc-nyc.rr.com%3e:
> -------- Original Message --------
> Subject: Cygwin build
> Date: Sun, 11 Sep 2005 08:13:38 -0400
> From: Lance Diduck <la...@nyc.rr.com>
> Reply-To: stdcxx-dev@incubator.apache.org
> To: <st...@incubator.apache.org>
> Notes on  Cygwin build __CYGWIN__ using gcc 3.4.4 BUILDTYPE=11s default modes 
> [...]
> 2. config.h file should have a entry for _RWSTD_NO_MADVISE I modified the build's config file directly, I'm not sre how to modify the things that
> generate the config.h in the first place.
> [...]

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