127 lines
4.5 KiB
C
127 lines
4.5 KiB
C
/****************************************************************************
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* sched/paging/paging.h
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*
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* Copyright (C) 2010 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_PAGING_PAGING_H
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#define __SCHED_PAGING_PAGING_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 <queue.h>
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#ifdef CONFIG_PAGING
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration ************************************************************/
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/* Supply reasonable (but probably non-optimal) default settings if
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* configuration items are omitted.
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*/
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#ifndef CONFIG_PAGING_DEFPRIO
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# define CONFIG_PAGING_DEFPRIO 50
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#endif
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#ifndef CONFIG_PAGING_WORKPERIOD
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# define CONFIG_PAGING_WORKPERIOD (500*1000) /* 1/2 second */
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#endif
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#ifndef CONFIG_PAGING_STACKSIZE
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# define CONFIG_PAGING_STACKSIZE CONFIG_IDLETHREAD_STACKSIZE
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#endif
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#ifdef CONFIG_DISABLE_SIGNALS
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# warning "Page fill support requires signals"
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifndef __ASSEMBLY
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/* This is the task IDof the page fill worker thread. This value was set in
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* os_start when the page fill worker thread was started.
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*/
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extern pid_t g_pgworker;
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/* The page fill worker thread maintains a static variable called g_pftcb.
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* If no page fill is in progress, g_pftcb will be NULL. Otherwise, g_pftcb
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* will point to the TCB of the task which is receiving the fill that is
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* in progess.
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*
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* NOTE: I think that this is the only state in which a TCB does not reside
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* in some list. Here is it in limbo, outside of the normally queuing while
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* the page file is in progress. Where here, it will be marked with
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* TSTATE_TASK_INVALID.
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*/
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extern FAR struct tcb_s *g_pftcb;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: pg_worker
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*
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* Description:
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* This is the entry point of the worker thread that performs the actual
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* page file.
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*
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* Input parameters:
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* argc, argv (not used)
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*
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* Returned Value:
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* Does not return
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*
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****************************************************************************/
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int pg_worker(int argc, char *argv[]);
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_PAGING */
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#endif /* __SCHED_PAGING_PAGING_H */
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