forked from Archive/PX4-Autopilot
132 lines
4.6 KiB
C
132 lines
4.6 KiB
C
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/****************************************************************************
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* sched/sem_internal.h
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*
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* Copyright (C) 2007, 2009-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __SCHED_SEM_INTERNAL_H
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#define __SCHED_SEM_INTERNAL_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <semaphore.h>
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#include <sched.h>
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#include <queue.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Type Declarations
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****************************************************************************/
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/* This is the named semaphore structure */
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struct nsem_s
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{
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FAR struct nsem_s *flink; /* Forward link */
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FAR struct nsem_s *blink; /* Backward link */
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uint16_t nconnect; /* Number of connections to semaphore */
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FAR char *name; /* Semaphore name (NULL if un-named) */
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bool unlinked; /* true if the semaphore has been unlinked */
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sem_t sem; /* The semaphore itself */
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};
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typedef struct nsem_s nsem_t;
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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/* This is a list of dyanamically allocated named semaphores */
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extern dq_queue_t g_nsems;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C" {
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#else
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#define EXTERN extern
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#endif
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/* Common semaphore logic */
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EXTERN void weak_function sem_initialize(void);
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EXTERN void sem_waitirq(FAR _TCB *wtcb, int errcode);
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EXTERN FAR nsem_t *sem_findnamed(const char *name);
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/* Special logic needed only by priority inheritance to manage collections of
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* holders of semaphores.
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*/
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#ifdef CONFIG_PRIORITY_INHERITANCE
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EXTERN void sem_initholders(void);
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EXTERN void sem_destroyholder(FAR sem_t *sem);
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EXTERN void sem_addholder(FAR sem_t *sem);
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EXTERN void sem_boostpriority(FAR sem_t *sem);
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EXTERN void sem_releaseholder(FAR sem_t *sem);
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EXTERN void sem_restorebaseprio(FAR _TCB *stcb, FAR sem_t *sem);
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# ifndef CONFIG_DISABLE_SIGNALS
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EXTERN void sem_canceled(FAR _TCB *stcb, FAR sem_t *sem);
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# else
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# define sem_canceled(stcb, sem)
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# endif
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#else
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# define sem_initholders()
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# define sem_destroyholder(sem)
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# define sem_addholder(sem)
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# define sem_boostpriority(sem)
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# define sem_releaseholder(sem)
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# define sem_restorebaseprio(stcb,sem)
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# define sem_canceled(stcb, sem)
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#endif
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __SCHED_SEM_INTERNAL_H */
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