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newlib-cygwin/newlib/libc/reent/impure.c

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import newlib-2000-02-17 snapshot
2000-02-18 03:39:52 +08:00
#include <reent.h>
Add --enable-newlib-reent-thread-local option By default, Newlib uses a huge object of type struct _reent to store thread-specific data. This object is returned by __getreent() if the __DYNAMIC_REENT__ Newlib configuration option is defined. The reentrancy structure contains for example errno and the standard input, output, and error file streams. This means that if an application only uses errno it has a dependency on the file stream support even if it does not use it. This is an issue for lower end targets and applications which need to qualify the software according to safety standards (for example ECSS-E-ST-40C, ECSS-Q-ST-80C, IEC 61508, ISO 26262, DO-178, DO-330, DO-333). If the new _REENT_THREAD_LOCAL configuration option is enabled, then struct _reent is replaced by dedicated thread-local objects for each struct _reent member. The thread-local objects are defined in translation units which use the corresponding object.
2022-05-16 17:51:54 +08:00
#ifndef _REENT_THREAD_LOCAL
2009-04-21 Sandra Loosemore <sandra@codesourcery.com> * libc/reent/impure.c (__sf_fake_stdin, __sf_fake_stdout) (__sf_fake_stderr): Declare locally with weak attribute.
2009-04-22 02:38:53 +08:00
/* Redeclare these symbols locally as weak so that the file containing
their definitions (along with a lot of other stuff) isn't sucked in
unless they are actually used by other compilation units. This is
important to reduce image size for targets with very small amounts
of memory. */
#ifdef _REENT_SMALL
Use weak reference for _REENT_SMALL Avoid a strong reference to __sfp[] for _impure_data. The __sfp[] is linked in if __sinit() is used for example.
2022-05-18 02:39:35 +08:00
extern __FILE __sf[3] _ATTRIBUTE ((weak));
#endif
2009-04-21 Sandra Loosemore <sandra@codesourcery.com> * libc/reent/impure.c (__sf_fake_stdin, __sf_fake_stdout) (__sf_fake_stderr): Declare locally with weak attribute.
2009-04-22 02:38:53 +08:00
Remove _global_impure_ptr indirection Remove the pointer indirection through the read-only _global_impure_ptr and directly use a externally visible _impure_data object of type struct _reent. This enables the static initialization of global data structures in a follow up patch. In addition, we get rid of a machine-specific file.
2022-05-03 20:51:55 +08:00
struct _reent __ATTRIBUTE_IMPURE_DATA__ _impure_data = _REENT_INIT (_impure_data);
2004-09-15 Corinna Vinschen <vinschen@redhat.com> * libc/reent/impure.c (reent_data): Define as alias to impure_data when building for Cygwin. * libc/include/sys/reent.h (_GLOBAL_REENT): Revert definition to _global_impure_ptr.
2004-09-16 05:44:39 +08:00
#ifdef __CYGWIN__
Remove _global_impure_ptr indirection Remove the pointer indirection through the read-only _global_impure_ptr and directly use a externally visible _impure_data object of type struct _reent. This enables the static initialization of global data structures in a follow up patch. In addition, we get rid of a machine-specific file.
2022-05-03 20:51:55 +08:00
extern struct _reent reent_data __attribute__ ((alias("_impure_data")));
2004-09-15 Corinna Vinschen <vinschen@redhat.com> * libc/reent/impure.c (reent_data): Define as alias to impure_data when building for Cygwin. * libc/include/sys/reent.h (_GLOBAL_REENT): Revert definition to _global_impure_ptr.
2004-09-16 05:44:39 +08:00
#endif
Remove _global_impure_ptr indirection Remove the pointer indirection through the read-only _global_impure_ptr and directly use a externally visible _impure_data object of type struct _reent. This enables the static initialization of global data structures in a follow up patch. In addition, we get rid of a machine-specific file.
2022-05-03 20:51:55 +08:00
struct _reent *__ATTRIBUTE_IMPURE_PTR__ _impure_ptr = &_impure_data;
Add --enable-newlib-reent-thread-local option By default, Newlib uses a huge object of type struct _reent to store thread-specific data. This object is returned by __getreent() if the __DYNAMIC_REENT__ Newlib configuration option is defined. The reentrancy structure contains for example errno and the standard input, output, and error file streams. This means that if an application only uses errno it has a dependency on the file stream support even if it does not use it. This is an issue for lower end targets and applications which need to qualify the software according to safety standards (for example ECSS-E-ST-40C, ECSS-Q-ST-80C, IEC 61508, ISO 26262, DO-178, DO-330, DO-333). If the new _REENT_THREAD_LOCAL configuration option is enabled, then struct _reent is replaced by dedicated thread-local objects for each struct _reent member. The thread-local objects are defined in translation units which use the corresponding object.
2022-05-16 17:51:54 +08:00
#endif /* _REENT_THREAD_LOCAL */