/usr/include/exo-1/exo/exo-utils.h is in libexo-1-dev 0.10.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (c) 2005-2006 Benedikt Meurer <benny@xfce.org>.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#if !defined (EXO_INSIDE_EXO_H) && !defined (EXO_COMPILATION)
#error "Only <exo/exo.h> can be included directly, this file may disappear or change contents."
#endif
#ifndef __EXO_UTILS_H__
#define __EXO_UTILS_H__
#include <glib.h>
G_BEGIN_DECLS
void exo_noop (void) G_GNUC_PURE;
gint exo_noop_one (void) G_GNUC_PURE;
gint exo_noop_zero (void) G_GNUC_PURE;
gpointer exo_noop_null (void) G_GNUC_PURE;
gboolean exo_noop_true (void) G_GNUC_PURE;
gboolean exo_noop_false (void) G_GNUC_PURE;
/* inline function implementations */
#if (defined(G_CAN_INLINE) && defined(__GNUC__) && defined(__i386__) && defined(__OPTIMIZE__)) || defined(__EXO_UTILS_C__)
G_INLINE_FUNC void exo_atomic_inc (gint *value);
G_INLINE_FUNC gboolean exo_atomic_dec (gint *value);
/**
* exo_atomic_inc:
* @value : a pointer to the integer value to increment.
*
* Increments the integer at @value by one in an
* atomic fashion. The advantage over using
* g_atomic_int_inc() is that calls to this
* function can be inlined.
*
* Since : 0.3.1
**/
G_INLINE_FUNC void
exo_atomic_inc (gint *value)
{
#if defined(__GNUC__) && defined(__i386__) && defined(__OPTIMIZE__)
__asm__ __volatile__ ("lock; incl %0"
: "=m" (*value)
: "m" (*value));
#else
g_atomic_int_inc (value);
#endif
}
/**
* exo_atomic_dec:
* @value : a pointer to the integer value to decrement.
*
* Decrements the integer at @value by one in an atomic
* fashion and returns %TRUE if the @value dropped to
* zero by this operation, else %FALSE. The advantage
* over using g_atomic_int_dec() is that calls to this
* function can be inlined.
*
* Returns: %TRUE if @value dropped to zero, else %FALSE.
*
* Since : 0.3.1
**/
G_INLINE_FUNC gboolean
exo_atomic_dec (gint *value)
{
#if defined(__GNUC__) && defined(__i386__) && defined(__OPTIMIZE__)
gint result;
__asm__ __volatile__ ("lock; xaddl %0,%1"
: "=r" (result), "=m" (*value)
: "0" (-1), "m" (*value));
return (result == 1);
#else
return g_atomic_int_dec_and_test (value);
#endif
}
#else /* (G_CAN_INLINE && __GNUC__ && __i386__ && __OPTIMIZE__) || __EXO_UTILS_C__ */
/* We do not use the inline versions of the exo_atomic_* functions, unless we can
* benefit from it. If the compiler is not able to inline it (or won't inline it
* because of any policy) it'd actually cause more overhead than calling the
* g_atomic_int_* counterparts directly.
*/
#define exo_atomic_inc(value) G_STMT_START{ g_atomic_int_inc ((value)); }G_STMT_END
#define exo_atomic_dec(value) (g_atomic_int_dec_and_test ((value)))
#endif /* (G_CAN_INLINE && __GNUC__ && __i386__ && __OPTIMIZE__) || __EXO_UTILS_C__ */
G_END_DECLS
#endif /* !__EXO_UTILS_H__ */
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