[RFA] enable dynamic (thread safe) reents
Fri Jun 13 06:21:00 GMT 2003
Christopher Faylor wrote:
> On Fri, May 16, 2003 at 02:12:16PM +0200, Thomas Pfaff wrote:
>>Thomas Pfaff wrote:
>>>While single threaded apps should keep run without problems (_impure_ptr
>>>is still used for the mainthread) multithreaded apps should be recompiled
>>>to get the full power of the thread safe reents. This is due the
>>>fact that _RRENT is used in some newlib headers directly. Unfortunately
>>>this affects also static libs, therefore this is will be a longer
>>this will only affect stdio
>>stdio.h:147:#define stdin (_REENT->_stdin)
>>stdio.h:148:#define stdout (_REENT->_stdout)
>>stdio.h:149:#define stderr (_REENT->_stderr)
>>and i consider this harmless.
> Does this imply that using a DLL rebuilt like this will require recompilation
> of static libraries using errno?
No. errno is handled differently.
#define errno (*__errno())
extern int *__errno _PARAMS ((void));
and __errno is in newlib implemented as
Therefore threads safe errnos are automatically enabled when newlib is
compiled with __DYNAMIC_REENT__.
Unfortunately stdin, stdout and stderr were defined with _REENT
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