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/****************************************************************************
* sched/libc/wqueue.h
*
* Copyright (C) 2014 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 __LIBC_WQUEUE_WQUEUE_H
#define __LIBC_WQUEUE_WQUEUE_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <semaphore.h>
#include <pthread.h>
#include <nuttx/wqueue.h>
#ifdef CONFIG_SCHED_WORKQUEUE
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Public Type Definitions
****************************************************************************/
/* This structure defines the state of one user-modework queue. */
struct usr_wqueue_s
{
uint32_t delay; /* Delay between polling cycles (ticks) */
struct dq_queue_s q; /* The queue of pending work */
pid_t pid; /* The task ID of the worker thread(s) */
};
/****************************************************************************
* Public Data
****************************************************************************/
#if defined(CONFIG_SCHED_USRWORK) && !defined(__KERNEL__)
/* The state of the user mode work queue */
extern struct usr_wqueue_s g_usrwork;
/* This semaphore/mutex supports exclusive access to the user-mode work queue */
#ifdef CONFIG_BUILD_PROTECTED
extern sem_t g_usrsem;
#else
extern pthread_mutex_t g_usrmutex;
#endif
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: work_lock
*
* Description:
* Lock the user-mode work queue.
*
* Input parameters:
* None
*
* Returned Value:
* Zero (OK) on success, a negated errno on failure. This error may be
* reported:
*
* -EINTR - Wait was interrupted by a signal
*
****************************************************************************/
#if defined(CONFIG_SCHED_USRWORK) && !defined(__KERNEL__)
int work_lock(void);
#endif
/****************************************************************************
* Name: work_unlock
*
* Description:
* Unlock the user-mode work queue.
*
* Input parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
#if defined(CONFIG_SCHED_USRWORK) && !defined(__KERNEL__)
void work_unlock(void);
#endif
#endif /* CONFIG_SCHED_WORKQUEUE */
#endif /* __LIBC_WQUEUE_WQUEUE_H */
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