/****************************************************************************
* sched/sem_internal.h
*
* Copyright (C) 2007, 2009-2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
#ifndef __SCHED_SEM_INTERNAL_H
#define __SCHED_SEM_INTERNAL_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <stdint.h>
#include <stdbool.h>
#include <semaphore.h>
#include <sched.h>
#include <queue.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Public Type Declarations
****************************************************************************/
/* This is the named semaphore structure */
struct nsem_s
{
FAR struct nsem_s *flink; /* Forward link */
FAR struct nsem_s *blink; /* Backward link */
uint16_t nconnect; /* Number of connections to semaphore */
FAR char *name; /* Semaphore name (NULL if un-named) */
bool unlinked; /* true if the semaphore has been unlinked */
sem_t sem; /* The semaphore itself */
};
typedef struct nsem_s nsem_t;
/****************************************************************************
* Public Variables
****************************************************************************/
/* This is a list of dyanamically allocated named semaphores */
extern dq_queue_t g_nsems;
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/* Common semaphore logic */
void weak_function sem_initialize(void);
void sem_waitirq(FAR struct tcb_s *wtcb, int errcode);
FAR nsem_t *sem_findnamed(const char *name);
/* Special logic needed only by priority inheritance to manage collections of
* holders of semaphores.
*/
#ifdef CONFIG_PRIORITY_INHERITANCE
void sem_initholders(void);
void sem_destroyholder(FAR sem_t *sem);
void sem_addholder(FAR sem_t *sem);
void sem_boostpriority(FAR sem_t *sem);
void sem_releaseholder(FAR sem_t *sem);
void sem_restorebaseprio(FAR struct tcb_s *stcb, FAR sem_t *sem);
# ifndef CONFIG_DISABLE_SIGNALS
void sem_canceled(FAR struct tcb_s *stcb, FAR sem_t *sem);
# else
# define sem_canceled(stcb, sem)
# endif
#else
# define sem_initholders()
# define sem_destroyholder(sem)
# define sem_addholder(sem)
# define sem_boostpriority(sem)
# define sem_releaseholder(sem)
# define sem_restorebaseprio(stcb,sem)
# define sem_canceled(stcb, sem)
#endif
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __SCHED_SEM_INTERNAL_H */
