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Proper locking for getchar() and putchar() 

Add internal inline functions _getchar_unlocked() and
_putchar_unlocked() if __CUSTOM_FILE_IO__ is not defined.  These
functions get _REENT only once.  Use them for getchar_unlocked() and
putchar_unlocked().  Define getchar() and putchar() to these unlocked
internal functions if __SINGLE_THREAD__ is defined, otherwise use the
external functions to use proper locking of the FILE object.

Assumes that __SINGLE_THREAD__ is not defined if __CYGWIN__ is defined.

Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
This commit is contained in:
Sebastian Huber 2017-08-07 07:35:19 +02:00
parent 65c13851b3
commit b0f271d1db
1 changed files with 32 additions and 7 deletions
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39
newlib/libc/include/stdio.h
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@ -735,14 +735,37 @@ _ELIDABLE_INLINE int __sputc_r(struct _reent *_ptr, int _c, FILE *_p) {
#define fileno(p) __sfileno(p)
#endif
#ifndef __CYGWIN__
#ifndef lint
#define getc(fp) __sgetc_r(_REENT, fp)
#define putc(x, fp) __sputc_r(_REENT, x, fp)
#endif /* lint */
#endif /* __CYGWIN__ */
static __inline int
_getchar_unlocked(void)
{
struct _reent *_ptr;
_ptr = _REENT;
return (__sgetc_r(_ptr, _stdin_r(_ptr)));
}
static __inline int
_putchar_unlocked(int _c)
{
struct _reent *_ptr;
_ptr = _REENT;
return (__sputc_r(_ptr, _c, _stdout_r(_ptr)));
}
#ifdef __SINGLE_THREAD__
#define getc(_p) __sgetc_r(_REENT, _p)
#define putc(_c, _p) __sputc_r(_REENT, _c, _p)
#define getchar() _getchar_unlocked()
#define putchar(_c) _putchar_unlocked(_c)
#endif /* __SINGLE_THREAD__ */
#endif /* __cplusplus */
#if __MISC_VISIBLE || __POSIX_VISIBLE
#define getchar_unlocked() _getchar_unlocked()
#define putchar_unlocked(_c) _putchar_unlocked(_c)
#endif
#if __MISC_VISIBLE
/* fast always-buffered version, true iff error */
#define fast_putc(x,p) (--(p)->_w < 0 ? \
@ -756,7 +779,7 @@ _ELIDABLE_INLINE int __sputc_r(struct _reent *_ptr, int _c, FILE *_p) {
#define L_ctermid 16
#endif
#endif /* !__CUSTOM_FILE_IO__ */
#else /* __CUSTOM_FILE_IO__ */
#define getchar() getc(stdin)
#define putchar(x) putc(x, stdout)
@ -766,6 +789,8 @@ _ELIDABLE_INLINE int __sputc_r(struct _reent *_ptr, int _c, FILE *_p) {
#define putchar_unlocked(x) putc_unlocked(x, stdout)
#endif
#endif /* !__CUSTOM_FILE_IO__ */
_END_STD_C
#endif /* _STDIO_H_ */