current.h

/*
 * Copyright (C) 2009 Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#ifndef _LIB_COBALT_CURRENT_H
#define _LIB_COBALT_CURRENT_H
 
#include <stdint.h>
#include <pthread.h>
#include <cobalt/uapi/thread.h>
#include <xeno_config.h>
 
extern pthread_key_t cobalt_current_window_key;
 
xnhandle_t cobalt_get_current_slow(void);
 
#ifdef HAVE_TLS
extern __thread __attribute__ ((tls_model (CONFIG_XENO_TLS_MODEL)))
xnhandle_t cobalt_current;
extern __thread __attribute__ ((tls_model (CONFIG_XENO_TLS_MODEL)))
struct xnthread_user_window *cobalt_current_window;
 
static inline xnhandle_t cobalt_get_current(void)
{
        return cobalt_current;
}
 
static inline xnhandle_t cobalt_get_current_fast(void)
{
        return cobalt_get_current();
}
 
static inline int cobalt_get_current_mode(void)
{
        return cobalt_current_window ? cobalt_current_window->state : XNRELAX;
}
 
static inline struct xnthread_user_window *cobalt_get_current_window(void)
{
        return cobalt_current ? cobalt_current_window : NULL;
}
 
#else /* ! HAVE_TLS */
extern pthread_key_t cobalt_current_key;
 
xnhandle_t cobalt_get_current_slow(void);
 
static inline xnhandle_t cobalt_get_current(void)
{
        void *val = pthread_getspecific(cobalt_current_key);
 
        return (xnhandle_t)(uintptr_t)val ?: cobalt_get_current_slow();
}
 
/* syscall-free, but unreliable in TSD destructor context */
static inline xnhandle_t cobalt_get_current_fast(void)
{
        void *val = pthread_getspecific(cobalt_current_key);
 
        return (xnhandle_t)(uintptr_t)val ?: XN_NO_HANDLE;
}
 
static inline int cobalt_get_current_mode(void)
{
        struct xnthread_user_window *window;
 
        window = pthread_getspecific(cobalt_current_window_key);
 
        return window ? window->state : XNRELAX;
}
 
static inline struct xnthread_user_window *cobalt_get_current_window(void)
{
        return pthread_getspecific(cobalt_current_window_key);
}
 
#endif /* ! HAVE_TLS */
 
void cobalt_init_current_keys(void);
 
void cobalt_set_tsd(__u32 u_winoff);
 
void cobalt_clear_tsd(void);
 
#endif /* _LIB_COBALT_CURRENT_H */