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/****************************************************************************
* libc/wqueue/work_usrthread.c
*
* Copyright (C) 2009-2014 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <errno.h>
#include <queue.h>
#include <debug.h>
#include <nuttx/wqueue.h>
#if defined(CONFIG_SCHED_WORKQUEUE) && defined(CONFIG_SCHED_USRWORK) && \
!defined(__KERNEL__)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* The state of the user mode work queue. */
extern struct wqueue_s g_usrwork;
/****************************************************************************
* Private Type Declarations
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: work_usrthread
*
* Description:
* This is the worker thread that performs the actions placed on the user
* work queue.
*
* This is a user mode work queue. It must be used by applications for
* miscellaneous operations. The user work thread must be started by
* application start-up logic by calling work_usrstart().
*
* Input parameters:
* argc, argv (not used)
*
* Returned Value:
* Does not return
*
****************************************************************************/
static int work_usrthread(int argc, char *argv[])
{
/* Loop forever */
for (;;)
{
/* Then process queued work. We need to keep interrupts disabled while
* we process items in the work list.
*/
work_process(&g_usrwork);
}
return OK; /* To keep some compilers happy */
}
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: work_usrstart
*
* Description:
* Start the user mode work queue.
*
* Input parameters:
* None
*
* Returned Value:
* The task ID of the worker thread is returned on success. A negated
* errno value is returned on failure.
*
****************************************************************************/
int work_usrstart(void)
{
/* Initialize work queue data structures */
dq_init(&g_usrwork.q);
/* Start a user-mode worker thread for use by applications. */
svdbg("Starting user-mode worker thread\n");
g_usrwork.pid = task_create("uwork",
CONFIG_SCHED_USRWORKPRIORITY,
CONFIG_SCHED_USRWORKSTACKSIZE,
(main_t)work_usrthread,
(FAR char * const *)NULL);
DEBUGASSERT(g_usrwork.pid > 0);
if (g_usrwork.pid < 0)
{
int errcode = errno;
DEBUGASSERT(errcode > 0);
sdbg("task_create failed: %d\n", errcode);
return -errcode;
}
return g_usrwork.pid;
}
#endif /* CONFIG_SCHED_WORKQUEUE && CONFIG_SCHED_USRWORK && !__KERNEL__*/
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