This is the mail archive of the
newlib@sourceware.org
mailing list for the newlib project.
Re: _REENT
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
That's what I thought, but wanted confirmation!
Thanks for the prompt reply!
Regards,
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)
Comment: http://getfiregpg.org
iD8DBQFIf3r8YcVjciDA62QRAmSrAJ9asKOOHeWOJHYPO3XuLzDUUZDAJACfQV6N
OXOV5/Og5XEdctENWRchpp4=
=wEeG
-----END PGP SIGNATURE-----
2008/7/17 Jeff Johnston <jjohnstn@redhat.com>:
> Raphael Derosso Pereira wrote:
>>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> I'm working with FreeRTOS and want to use _REENT, but I don't know how
>> to setup this in a multithread environment. Is there any function that
>> can be used to specify the current _REENT structure on context switch?
>>
>>
>
> All that is needed is to set the global variable: _impure_ptr to a new
> reentrancy structure you have previously
> initialized via the _REENT_INIT() macro. See libc/reent/impure.c You can
> do this manually in your
> thread switching logic or you can do the following:
>
> If you set the flag __DYNAMIC_REENT__ for your platform, newlib functions
> requiring reentrancy will call __getreent() to get the reentrancy structure
> for the current thread automatically. You need to supply this function and
> how it is implemented is up to you. One way would be using thread-specific
> storage if you support it. Another way would be to use a global hash table
> or array indexed by thread-id. It's up to you. You would register a new
> reentrancy structure on thread creation. Typically you set
> the __DYNAMIC_REENT__ flag in libc/include/sys/config.h.
>
> If you don't use __DYNAMIC_REENT__, then you either have to set _impure_ptr
> manually or else you can use the reentrant versions of the newlib functions
> and call with the appropriate reentrancy structure as a parameter.
>
> -- Jeff J.
>>
>> - --
>> Raphael Derosso Pereira
>> Engenheiro de Computação
>> icq: 4517421
>> msn: rderossopereira@hotmail.com
>> Skype: rderossopereira
>>
>> -----BEGIN PGP SIGNATURE-----
>> Version: GnuPG v1.4.6 (GNU/Linux)
>> Comment: http://getfiregpg.org
>>
>> iD8DBQFIf2EJYcVjciDA62QRAnQKAKDwulaD/g08Hc+HEvtPN/443kSQ6gCfUgYM
>> hadVmX/my9M45A50/FMPUr8=
>> =K8iu
>> -----END PGP SIGNATURE-----
>>
>
>
--
Raphael Derosso Pereira
Engenheiro de Computação
icq: 4517421
msn: rderossopereira@hotmail.com
Skype: rderossopereira