diff options
| author | Matt Joyce <matthew.joyce@embedded-brains.de> | 2022-05-16 12:51:54 +0300 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2022-07-13 07:55:46 +0300 |
| commit | ea99f21ce6c8a332845439ea87f792dbaf679d42 (patch) | |
| tree | 94cfcaf461882955f7461b09d6c4c0e2f321e66e /newlib/libc/stdio | |
| parent | 1a0908203606527b6ac0ed438669b5bcd247a5f9 (diff) | |
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.
Diffstat (limited to 'newlib/libc/stdio')
| -rw-r--r-- | newlib/libc/stdio/findfp.c | 7 | ||||
| -rw-r--r-- | newlib/libc/stdio/tmpnam.c | 5 |
2 files changed, 12 insertions, 0 deletions
diff --git a/newlib/libc/stdio/findfp.c b/newlib/libc/stdio/findfp.c index fbdb7f2f2..c43028209 100644 --- a/newlib/libc/stdio/findfp.c +++ b/newlib/libc/stdio/findfp.c @@ -32,6 +32,13 @@ __FILE __sf[3]; struct _glue __sglue = {NULL, 3, &__sf[0]}; +#ifdef _REENT_THREAD_LOCAL +_Thread_local __FILE *_tls_stdin = &__sf[0]; +_Thread_local __FILE *_tls_stdout = &__sf[1]; +_Thread_local __FILE *_tls_stderr = &__sf[2]; +_Thread_local void (*_tls_cleanup)(struct _reent *); +#endif + #ifdef _STDIO_BSD_SEMANTICS /* BSD and Glibc systems only flush streams which have been written to at exit time. Calling flush rather than close for speed, as on diff --git a/newlib/libc/stdio/tmpnam.c b/newlib/libc/stdio/tmpnam.c index 2767b4b20..51dfd1cea 100644 --- a/newlib/libc/stdio/tmpnam.c +++ b/newlib/libc/stdio/tmpnam.c @@ -82,6 +82,11 @@ The global pointer <<environ>> is also required. #include <reent.h> #include <errno.h> +#ifdef _REENT_THREAD_LOCAL +_Thread_local int _tls_inc; +_Thread_local char _tls_emergency; +#endif + /* Try to open the file specified, if it can't be opened then try another one. Return nonzero if successful, otherwise zero. */ |