ncurses/ncurses/tinfo/lib_data.c - nest-cam/4320010/ncurses - Git at Google

 /****************************************************************************
  * Copyright (c) 1998-2012,2013 Free Software Foundation, Inc.              *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
  * "Software"), to deal in the Software without restriction, including      *
  * without limitation the rights to use, copy, modify, merge, publish,      *
  * distribute, distribute with modifications, sublicense, and/or sell       *
  * copies of the Software, and to permit persons to whom the Software is    *
  * furnished to do so, subject to the following conditions:                 *
  *                                                                          *
  * The above copyright notice and this permission notice shall be included  *
  * in all copies or substantial portions of the Software.                   *
  *                                                                          *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  *                                                                          *
  * Except as contained in this notice, the name(s) of the above copyright   *
  * holders shall not be used in advertising or otherwise to promote the     *
  * sale, use or other dealings in this Software without prior written       *
  * authorization.                                                           *
  ****************************************************************************/

 /****************************************************************************
  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
  *     and: Thomas E. Dickey                        1996-on                 *
  *     and: Juergen Pfeifer                                                 *
  ****************************************************************************/

 /*
 **	lib_data.c
 **
 **	Common data that may/may not be allocated, but is referenced globally
 **
 */

 #include <curses.priv.h>

 MODULE_ID("$Id: lib_data.c,v 1.66 2013/08/24 17:28:24 tom Exp $")

 /*
  * OS/2's native linker complains if we don't initialize public data when
  * constructing a dll (reported by J.J.G.Ripoll).
  */
 #if USE_REENTRANT
 NCURSES_EXPORT(WINDOW *)
 NCURSES_PUBLIC_VAR(stdscr) (void)
 {
     return CURRENT_SCREEN ? StdScreen(CURRENT_SCREEN) : 0;
 }
 NCURSES_EXPORT(WINDOW *)
 NCURSES_PUBLIC_VAR(curscr) (void)
 {
     return CURRENT_SCREEN ? CurScreen(CURRENT_SCREEN) : 0;
 }
 NCURSES_EXPORT(WINDOW *)
 NCURSES_PUBLIC_VAR(newscr) (void)
 {
     return CURRENT_SCREEN ? NewScreen(CURRENT_SCREEN) : 0;
 }
 #else
 NCURSES_EXPORT_VAR(WINDOW *) stdscr = 0;
 NCURSES_EXPORT_VAR(WINDOW *) curscr = 0;
 NCURSES_EXPORT_VAR(WINDOW *) newscr = 0;
 #endif

 NCURSES_EXPORT_VAR(SCREEN *) _nc_screen_chain = 0;

 /*
  * The variable 'SP' will be defined as a function on systems that cannot link
  * data-only modules, since it is used in a lot of places within ncurses and we
  * cannot guarantee that any application will use any particular function.  We
  * put the WINDOW variables in this module, because it appears that any
  * application that uses them will also use 'SP'.
  *
  * This module intentionally does not reference other ncurses modules, to avoid
  * module coupling that increases the size of the executable.
  */
 #if BROKEN_LINKER
 static SCREEN *my_screen;

 NCURSES_EXPORT(SCREEN *)
 _nc_screen(void)
 {
     return my_screen;
 }

 NCURSES_EXPORT(int)
 _nc_alloc_screen(void)
 {
     return ((my_screen = _nc_alloc_screen_sp()) != 0);
 }

 NCURSES_EXPORT(void)
 _nc_set_screen(SCREEN *sp)
 {
     my_screen = sp;
 }

 #else

 NCURSES_EXPORT_VAR(SCREEN *) SP = NULL; /* Some linkers require initialized data... */
 #endif
 /* *INDENT-OFF* */
 #define CHARS_0s { '\0' }

 #define TGETENT_0 { 0L, FALSE, NULL, NULL, NULL }
 #define TGETENT_0s { TGETENT_0, TGETENT_0, TGETENT_0, TGETENT_0 }

 NCURSES_EXPORT_VAR(NCURSES_GLOBALS) _nc_globals = {
     0,				/* have_sigtstp */
     0,				/* have_sigwinch */
     0,				/* cleanup_nested */

     FALSE,			/* init_signals */
     FALSE,			/* init_screen */

     NULL,			/* comp_sourcename */
     NULL,			/* comp_termtype */

     FALSE,			/* have_tic_directory */
     FALSE,			/* keep_tic_directory */
     0,				/* tic_directory */

     NULL,			/* dbi_list */
     0,				/* dbi_size */

     NULL,			/* first_name */
     NULL,			/* keyname_table */
     0,				/* init_keyname */

     0,				/* slk_format */

     NULL,			/* safeprint_buf */
     0,				/* safeprint_used */

     TGETENT_0s,			/* tgetent_cache */
     0,				/* tgetent_index */
     0,				/* tgetent_sequence */

     0,				/* dbd_blob */
     0,				/* dbd_list */
     0,				/* dbd_size */
     0,				/* dbd_time */
     { { 0, 0 } },		/* dbd_vars */

 #ifndef USE_SP_WINDOWLIST
     0,				/* _nc_windowlist */
 #endif

 #if USE_HOME_TERMINFO
     NULL,			/* home_terminfo */
 #endif

 #if !USE_SAFE_SPRINTF
     0,				/* safeprint_cols */
     0,				/* safeprint_rows */
 #endif

 #ifdef USE_TERM_DRIVER
     0,				/* term_driver */
 #endif

 #ifdef TRACE
     FALSE,			/* init_trace */
     CHARS_0s,			/* trace_fname */
     0,				/* trace_level */
     NULL,			/* trace_fp */

     NULL,			/* tracearg_buf */
     0,				/* tracearg_used */

     NULL,			/* tracebuf_ptr */
     0,				/* tracebuf_used */

     CHARS_0s,			/* tracechr_buf */

     NULL,			/* tracedmp_buf */
     0,				/* tracedmp_used */

     NULL,			/* tracetry_buf */
     0,				/* tracetry_used */

     { CHARS_0s, CHARS_0s },	/* traceatr_color_buf */
     0,				/* traceatr_color_sel */
     -1,				/* traceatr_color_last */
 #if !defined(USE_PTHREADS) && USE_REENTRANT
     0,				/* nested_tracef */
 #endif
 #endif /* TRACE */
 #ifdef USE_PTHREADS
     PTHREAD_MUTEX_INITIALIZER,	/* mutex_curses */
     PTHREAD_MUTEX_INITIALIZER,	/* mutex_tst_tracef */
     PTHREAD_MUTEX_INITIALIZER,	/* mutex_tracef */
     0,				/* nested_tracef */
     0,				/* use_pthreads */
 #endif
 #if USE_PTHREADS_EINTR
     0,				/* read_thread */
 #endif
 };

 #define STACK_FRAME_0	{ { 0 }, 0 }
 #define STACK_FRAME_0s	{ STACK_FRAME_0 }
 #define NUM_VARS_0s	{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }

 #define RIPOFF_0	{ 0,0,0 }
 #define RIPOFF_0s	{ RIPOFF_0 }

 NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen = {
     TRUE,			/* use_env */
     FALSE,			/* filter_mode */
     A_NORMAL,			/* previous_attr */
 #ifndef USE_SP_RIPOFF
     RIPOFF_0s,			/* ripoff */
     NULL,			/* rsp */
 #endif
     {				/* tparm_state */
 #ifdef TRACE
 	NULL,			/* tname */
 #endif
 	NULL,			/* tparam_base */

 	STACK_FRAME_0s,		/* stack */
 	0,			/* stack_ptr */

 	NULL,			/* out_buff */
 	0,			/* out_size */
 	0,			/* out_used */

 	NULL,			/* fmt_buff */
 	0,			/* fmt_size */

 	NUM_VARS_0s,		/* dynamic_var */
 	NUM_VARS_0s,		/* static_vars */
     },
     NULL,			/* saved_tty */
 #if NCURSES_NO_PADDING
     FALSE,			/* flag to set if padding disabled  */
 #endif
     0,				/* _outch */
 #if BROKEN_LINKER || USE_REENTRANT
     NULL,			/* real_acs_map */
     0,				/* LINES */
     0,				/* COLS */
     8,				/* TABSIZE */
     1000,			/* ESCDELAY */
     0,				/* cur_term */
 #ifdef TRACE
     0L,				/* _outchars */
     NULL,			/* _tputs_trace */
 #endif
 #endif
     FALSE,			/* use_tioctl */
 };
 /* *INDENT-ON* */

 /*
  * wgetch() and other functions with a WINDOW* parameter may use a SCREEN*
  * internally, and it is useful to allow those to be invoked without switching
  * SCREEN's, e.g., for multi-threaded applications.
  */
 NCURSES_EXPORT(SCREEN *)
 _nc_screen_of(WINDOW *win)
 {
     SCREEN *sp = 0;

     if (win != 0) {
 	sp = WINDOW_EXT(win, screen);
     }
     return (sp);
 }

 /******************************************************************************/
 #ifdef USE_PTHREADS
 static void
 init_global_mutexes(void)
 {
     static bool initialized = FALSE;

     if (!initialized) {
 	initialized = TRUE;
 	_nc_mutex_init(&_nc_globals.mutex_curses);
 	_nc_mutex_init(&_nc_globals.mutex_tst_tracef);
 	_nc_mutex_init(&_nc_globals.mutex_tracef);
     }
 }

 NCURSES_EXPORT(void)
 _nc_init_pthreads(void)
 {
     if (_nc_use_pthreads)
 	return;
 # if USE_WEAK_SYMBOLS
     if ((pthread_mutex_init) == 0)
 	return;
     if ((pthread_mutex_lock) == 0)
 	return;
     if ((pthread_mutex_unlock) == 0)
 	return;
     if ((pthread_mutex_trylock) == 0)
 	return;
     if ((pthread_mutexattr_settype) == 0)
 	return;
 # endif
     _nc_use_pthreads = 1;
     init_global_mutexes();
 }

 /*
  * Use recursive mutexes if we have them - they're part of Unix98.
  * For the cases where we do not, _nc_mutex_trylock() is used to avoid a
  * deadlock, at the expense of memory leaks and unexpected failures that
  * may not be handled by typical clients.
  *
  * FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to
  * PTHREAD_MUTEX_NORMAL if not supported.
  */
 NCURSES_EXPORT(void)
 _nc_mutex_init(pthread_mutex_t * obj)
 {
     pthread_mutexattr_t recattr;

     if (_nc_use_pthreads) {
 	pthread_mutexattr_init(&recattr);
 	pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE);
 	pthread_mutex_init(obj, &recattr);
     }
 }

 NCURSES_EXPORT(int)
 _nc_mutex_lock(pthread_mutex_t * obj)
 {
     if (_nc_use_pthreads == 0)
 	return 0;
     return pthread_mutex_lock(obj);
 }

 NCURSES_EXPORT(int)
 _nc_mutex_trylock(pthread_mutex_t * obj)
 {
     if (_nc_use_pthreads == 0)
 	return 0;
     return pthread_mutex_trylock(obj);
 }

 NCURSES_EXPORT(int)
 _nc_mutex_unlock(pthread_mutex_t * obj)
 {
     if (_nc_use_pthreads == 0)
 	return 0;
     return pthread_mutex_unlock(obj);
 }
 #endif /* USE_PTHREADS */

 #if defined(USE_PTHREADS) || USE_PTHREADS_EINTR
 #if USE_WEAK_SYMBOLS
 /*
  * NB: sigprocmask(2) is global but pthread_sigmask(3p)
  * only for the calling thread.
  */
 NCURSES_EXPORT(int)
 _nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask)
 {
     if ((pthread_sigmask))
 	return pthread_sigmask(how, newmask, oldmask);
     else
 	return sigprocmask(how, newmask, oldmask);
 }
 #endif
 #endif /* USE_PTHREADS */
	/****************************************************************************
	* Copyright (c) 1998-2012,2013 Free Software Foundation, Inc. *
	* *
	* Permission is hereby granted, free of charge, to any person obtaining a *
	* copy of this software and associated documentation files (the *
	* "Software"), to deal in the Software without restriction, including *
	* without limitation the rights to use, copy, modify, merge, publish, *
	* distribute, distribute with modifications, sublicense, and/or sell *
	* copies of the Software, and to permit persons to whom the Software is *
	* furnished to do so, subject to the following conditions: *
	* *
	* The above copyright notice and this permission notice shall be included *
	* in all copies or substantial portions of the Software. *
	* *
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
	* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
	* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
	* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
	* *
	* Except as contained in this notice, the name(s) of the above copyright *
	* holders shall not be used in advertising or otherwise to promote the *
	* sale, use or other dealings in this Software without prior written *
	* authorization. *
	****************************************************************************/

	/****************************************************************************
	* Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
	* and: Eric S. Raymond <esr@snark.thyrsus.com> *
	* and: Thomas E. Dickey 1996-on *
	* and: Juergen Pfeifer *
	****************************************************************************/

	/*
	** lib_data.c
	**
	** Common data that may/may not be allocated, but is referenced globally
	**
	*/

	#include <curses.priv.h>

	MODULE_ID("$Id: lib_data.c,v 1.66 2013/08/24 17:28:24 tom Exp $")

	/*
	* OS/2's native linker complains if we don't initialize public data when
	* constructing a dll (reported by J.J.G.Ripoll).
	*/
	#if USE_REENTRANT
	NCURSES_EXPORT(WINDOW *)
	NCURSES_PUBLIC_VAR(stdscr) (void)
	{
	return CURRENT_SCREEN ? StdScreen(CURRENT_SCREEN) : 0;
	}
	NCURSES_EXPORT(WINDOW *)
	NCURSES_PUBLIC_VAR(curscr) (void)
	{
	return CURRENT_SCREEN ? CurScreen(CURRENT_SCREEN) : 0;
	}
	NCURSES_EXPORT(WINDOW *)
	NCURSES_PUBLIC_VAR(newscr) (void)
	{
	return CURRENT_SCREEN ? NewScreen(CURRENT_SCREEN) : 0;
	}
	#else
	NCURSES_EXPORT_VAR(WINDOW *) stdscr = 0;
	NCURSES_EXPORT_VAR(WINDOW *) curscr = 0;
	NCURSES_EXPORT_VAR(WINDOW *) newscr = 0;
	#endif

	NCURSES_EXPORT_VAR(SCREEN *) _nc_screen_chain = 0;

	/*
	* The variable 'SP' will be defined as a function on systems that cannot link
	* data-only modules, since it is used in a lot of places within ncurses and we
	* cannot guarantee that any application will use any particular function. We
	* put the WINDOW variables in this module, because it appears that any
	* application that uses them will also use 'SP'.
	*
	* This module intentionally does not reference other ncurses modules, to avoid
	* module coupling that increases the size of the executable.
	*/
	#if BROKEN_LINKER
	static SCREEN *my_screen;

	NCURSES_EXPORT(SCREEN *)
	_nc_screen(void)
	{
	return my_screen;
	}

	NCURSES_EXPORT(int)
	_nc_alloc_screen(void)
	{
	return ((my_screen = _nc_alloc_screen_sp()) != 0);
	}

	NCURSES_EXPORT(void)
	_nc_set_screen(SCREEN *sp)
	{
	my_screen = sp;
	}

	#else

	NCURSES_EXPORT_VAR(SCREEN ) SP = NULL; / Some linkers require initialized data... */
	#endif
	/* INDENT-OFF */
	#define CHARS_0s { '\0' }

	#define TGETENT_0 { 0L, FALSE, NULL, NULL, NULL }
	#define TGETENT_0s { TGETENT_0, TGETENT_0, TGETENT_0, TGETENT_0 }

	NCURSES_EXPORT_VAR(NCURSES_GLOBALS) _nc_globals = {
	0, /* have_sigtstp */
	0, /* have_sigwinch */
	0, /* cleanup_nested */

	FALSE, /* init_signals */
	FALSE, /* init_screen */

	NULL, /* comp_sourcename */
	NULL, /* comp_termtype */

	FALSE, /* have_tic_directory */
	FALSE, /* keep_tic_directory */
	0, /* tic_directory */

	NULL, /* dbi_list */
	0, /* dbi_size */

	NULL, /* first_name */
	NULL, /* keyname_table */
	0, /* init_keyname */

	0, /* slk_format */

	NULL, /* safeprint_buf */
	0, /* safeprint_used */

	TGETENT_0s, /* tgetent_cache */
	0, /* tgetent_index */
	0, /* tgetent_sequence */

	0, /* dbd_blob */
	0, /* dbd_list */
	0, /* dbd_size */
	0, /* dbd_time */
	{ { 0, 0 } }, /* dbd_vars */

	#ifndef USE_SP_WINDOWLIST
	0, /* _nc_windowlist */
	#endif

	#if USE_HOME_TERMINFO
	NULL, /* home_terminfo */
	#endif

	#if !USE_SAFE_SPRINTF
	0, /* safeprint_cols */
	0, /* safeprint_rows */
	#endif

	#ifdef USE_TERM_DRIVER
	0, /* term_driver */
	#endif

	#ifdef TRACE
	FALSE, /* init_trace */
	CHARS_0s, /* trace_fname */
	0, /* trace_level */
	NULL, /* trace_fp */

	NULL, /* tracearg_buf */
	0, /* tracearg_used */

	NULL, /* tracebuf_ptr */
	0, /* tracebuf_used */

	CHARS_0s, /* tracechr_buf */

	NULL, /* tracedmp_buf */
	0, /* tracedmp_used */

	NULL, /* tracetry_buf */
	0, /* tracetry_used */

	{ CHARS_0s, CHARS_0s }, /* traceatr_color_buf */
	0, /* traceatr_color_sel */
	-1, /* traceatr_color_last */
	#if !defined(USE_PTHREADS) && USE_REENTRANT
	0, /* nested_tracef */
	#endif
	#endif /* TRACE */
	#ifdef USE_PTHREADS
	PTHREAD_MUTEX_INITIALIZER, /* mutex_curses */
	PTHREAD_MUTEX_INITIALIZER, /* mutex_tst_tracef */
	PTHREAD_MUTEX_INITIALIZER, /* mutex_tracef */
	0, /* nested_tracef */
	0, /* use_pthreads */
	#endif
	#if USE_PTHREADS_EINTR
	0, /* read_thread */
	#endif
	};

	#define STACK_FRAME_0 { { 0 }, 0 }
	#define STACK_FRAME_0s { STACK_FRAME_0 }
	#define NUM_VARS_0s { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }

	#define RIPOFF_0 { 0,0,0 }
	#define RIPOFF_0s { RIPOFF_0 }

	NCURSES_EXPORT_VAR(NCURSES_PRESCREEN) _nc_prescreen = {
	TRUE, /* use_env */
	FALSE, /* filter_mode */
	A_NORMAL, /* previous_attr */
	#ifndef USE_SP_RIPOFF
	RIPOFF_0s, /* ripoff */
	NULL, /* rsp */
	#endif
	{ /* tparm_state */
	#ifdef TRACE
	NULL, /* tname */
	#endif
	NULL, /* tparam_base */

	STACK_FRAME_0s, /* stack */
	0, /* stack_ptr */

	NULL, /* out_buff */
	0, /* out_size */
	0, /* out_used */

	NULL, /* fmt_buff */
	0, /* fmt_size */

	NUM_VARS_0s, /* dynamic_var */
	NUM_VARS_0s, /* static_vars */
	},
	NULL, /* saved_tty */
	#if NCURSES_NO_PADDING
	FALSE, /* flag to set if padding disabled */
	#endif
	0, /* _outch */
	#if BROKEN_LINKER \|\| USE_REENTRANT
	NULL, /* real_acs_map */
	0, /* LINES */
	0, /* COLS */
	8, /* TABSIZE */
	1000, /* ESCDELAY */
	0, /* cur_term */
	#ifdef TRACE
	0L, /* _outchars */
	NULL, /* _tputs_trace */
	#endif
	#endif
	FALSE, /* use_tioctl */
	};
	/* INDENT-ON */

	/*
	* wgetch() and other functions with a WINDOW* parameter may use a SCREEN*
	* internally, and it is useful to allow those to be invoked without switching
	* SCREEN's, e.g., for multi-threaded applications.
	*/
	NCURSES_EXPORT(SCREEN *)
	_nc_screen_of(WINDOW *win)
	{
	SCREEN *sp = 0;

	if (win != 0) {
	sp = WINDOW_EXT(win, screen);
	}
	return (sp);
	}

	/******************************************************************************/
	#ifdef USE_PTHREADS
	static void
	init_global_mutexes(void)
	{
	static bool initialized = FALSE;

	if (!initialized) {
	initialized = TRUE;
	_nc_mutex_init(&_nc_globals.mutex_curses);
	_nc_mutex_init(&_nc_globals.mutex_tst_tracef);
	_nc_mutex_init(&_nc_globals.mutex_tracef);
	}
	}

	NCURSES_EXPORT(void)
	_nc_init_pthreads(void)
	{
	if (_nc_use_pthreads)
	return;
	# if USE_WEAK_SYMBOLS
	if ((pthread_mutex_init) == 0)
	return;
	if ((pthread_mutex_lock) == 0)
	return;
	if ((pthread_mutex_unlock) == 0)
	return;
	if ((pthread_mutex_trylock) == 0)
	return;
	if ((pthread_mutexattr_settype) == 0)
	return;
	# endif
	_nc_use_pthreads = 1;
	init_global_mutexes();
	}

	/*
	* Use recursive mutexes if we have them - they're part of Unix98.
	* For the cases where we do not, _nc_mutex_trylock() is used to avoid a
	* deadlock, at the expense of memory leaks and unexpected failures that
	* may not be handled by typical clients.
	*
	* FIXME - need configure check for PTHREAD_MUTEX_RECURSIVE, define it to
	* PTHREAD_MUTEX_NORMAL if not supported.
	*/
	NCURSES_EXPORT(void)
	_nc_mutex_init(pthread_mutex_t * obj)
	{
	pthread_mutexattr_t recattr;

	if (_nc_use_pthreads) {
	pthread_mutexattr_init(&recattr);
	pthread_mutexattr_settype(&recattr, PTHREAD_MUTEX_RECURSIVE);
	pthread_mutex_init(obj, &recattr);
	}
	}

	NCURSES_EXPORT(int)
	_nc_mutex_lock(pthread_mutex_t * obj)
	{
	if (_nc_use_pthreads == 0)
	return 0;
	return pthread_mutex_lock(obj);
	}

	NCURSES_EXPORT(int)
	_nc_mutex_trylock(pthread_mutex_t * obj)
	{
	if (_nc_use_pthreads == 0)
	return 0;
	return pthread_mutex_trylock(obj);
	}

	NCURSES_EXPORT(int)
	_nc_mutex_unlock(pthread_mutex_t * obj)
	{
	if (_nc_use_pthreads == 0)
	return 0;
	return pthread_mutex_unlock(obj);
	}
	#endif /* USE_PTHREADS */

	#if defined(USE_PTHREADS) \|\| USE_PTHREADS_EINTR
	#if USE_WEAK_SYMBOLS
	/*
	* NB: sigprocmask(2) is global but pthread_sigmask(3p)
	* only for the calling thread.
	*/
	NCURSES_EXPORT(int)
	_nc_sigprocmask(int how, const sigset_t * newmask, sigset_t * oldmask)
	{
	if ((pthread_sigmask))
	return pthread_sigmask(how, newmask, oldmask);
	else
	return sigprocmask(how, newmask, oldmask);
	}
	#endif
	#endif /* USE_PTHREADS */