getchar_unlocked—non-thread-safe version of getchar (macro)Synopsis
#include <stdio.h> int getchar_unlocked(void); #include <stdio.h> int _getchar_unlocked_r(struct _reent *ptr);
Description
getchar_unlocked is a non-thread-safe version of getchar
declared in stdio.h. getchar_unlocked may only safely be used
within a scope protected by flockfile() (or ftrylockfile()) and
funlockfile(). These functions may safely be used in a multi-threaded
program if and only if they are called while the invoking thread owns
the ( FILE *) object, as is the case after a successful call to the
flockfile() or ftrylockfile() functions. If threads are disabled,
then getchar_unlocked is equivalent to getchar.
The _getchar_unlocked_r function is simply the reentrant version of
getchar_unlocked which passes an addtional reentrancy structure pointer
argument: ptr.
Returns
See getchar.
Portability
POSIX 1003.1 requires getchar_unlocked. getchar_unlocked may
be implemented as a macro.
Supporting OS subroutines required: close, fstat, isatty,
lseek, read, sbrk, write.