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-@node Reentrancy
-@chapter Reentrancy
-
-@cindex reentrancy
-Reentrancy is a characteristic of library functions which allows multiple
-processes to use the same address space with assurance that the values stored
-in those spaces will remain constant between calls. Cygnus's implementation
-of the library functions ensures that 
-whenever possible, these library functions are reentrant.  However,
-there are some functions that can not be trivially made reentrant.
-Hooks have been provided to allow you to use these functions in a fully
-reentrant fashion.
-
-@findex _reent
-@findex reent.h
-@cindex reentrancy structure
-These hooks use the structure @code{_reent} defined in @file{reent.h}.
-A variable defined as @samp{struct _reent} is called a @dfn{reentrancy
-structure}.  All functions which must manipulate global information are
-available in two versions.  The first version has the usual name, and
-uses a single global instance of the reentrancy structure.  The second
-has a different name, normally formed by prepending @samp{_} and
-appending @samp{_r}, and takes a pointer to the particular reentrancy
-structure to use.
-
-For example, the function @code{fopen} takes two arguments, @var{file}
-and @var{mode}, and uses the global reentrancy structure.  The function
-@code{_fopen_r} takes the arguments, @var{struct_reent}, which is a
-pointer to an instance of the reentrancy structure, @var{file}
-and @var{mode}.	
-
-@cindex global reentrancy structure
-@findex _impure_ptr
-Each function which uses the global reentrancy structure uses the global
-variable @code{_impure_ptr}, which points to a reentrancy structure.
-
-This means that you have two ways to achieve reentrancy.  Both require
-that each thread of execution control initialize a unique global
-variable of type @samp{struct _reent}:
-
-@enumerate
-@item
-@cindex extra argument, reentrant fns
-Use the reentrant versions of the library functions, after initializing
-a global reentrancy structure for each process.  Use the pointer to this
-structure as the extra argument for all library functions.
-
-@item
-Ensure that each thread of execution control has a pointer to its own
-unique reentrancy structure in the global variable @code{_impure_ptr},
-and call the standard library subroutines.
-@end enumerate
-
-@cindex list of reentrant functions
-@cindex reentrant function list
-The following functions are provided in both reentrant
-and non-reentrant versions.
-
-@example
-@exdent @emph{Equivalent for errno variable:}
-_errno_r
-
-@exdent @emph{Locale functions:}
-_localeconv_r  _setlocale_r
-
-@exdent @emph{Equivalents for stdio variables:}
-_stdin_r        _stdout_r       _stderr_r
-
-@page  
-@exdent @emph{Stdio functions:}
-_fdopen_r       _mkstemp_r       _remove_r
-_fopen_r        _mktemp_r        _rename_r
-_getchar_r      _perror_r        _tempnam_r
-_gets_r         _putchar_r       _tmpnam_r 
-_iprintf_r 	_puts_r		 _tmpfile_r
-
-@exdent @emph{Signal functions:}
-_raise_r        _signal_r
-
-@exdent @emph{Stdlib functions:}
-@c FIXME! dtoa undoc; should _dtoa_r be mentioned?
-_dtoa_r         _realloc_r      _strtoul_r
-_free_r         _srand_r        _system_r
-_malloc_r       _strtod_r
-_rand_r         _strtol_r
-
-@exdent @emph{String functions:}
-_strtok_r
-
-@exdent @emph{System functions:}
-_close_r        _lseek_r        _stat_r
-_fork_r         _open_r         _unlink_r
-_fstat_r        _read_r         _wait_r
-_link_r         _sbrk_r         _write_r
-
-@exdent @emph{Time function:}
-_asctime_r
-@end example