diff options
Diffstat (limited to 'nuttx/sched/pg_internal.h')
-rw-r--r-- | nuttx/sched/pg_internal.h | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/nuttx/sched/pg_internal.h b/nuttx/sched/pg_internal.h new file mode 100644 index 000000000..e7bafcd91 --- /dev/null +++ b/nuttx/sched/pg_internal.h @@ -0,0 +1,126 @@ +/**************************************************************************** + * sched/pg_internal.h + * + * Copyright (C) 2010 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_PG_INTERNAL_H +#define __SCHED_PG_INTERNAL_H + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#include <queue.h> + +#ifdef CONFIG_PAGING + +/**************************************************************************** + * Pre-Processor Definitions + ****************************************************************************/ + +/* Configuration ************************************************************/ + +/* Supply reasonable (but probably non-optimal) default settings if + * configuration items are omitted. + */ + +#ifndef CONFIG_PAGING_DEFPRIO +# define CONFIG_PAGING_DEFPRIO 50 +#endif + +#ifndef CONFIG_PAGING_WORKPERIOD +# define CONFIG_PAGING_WORKPERIOD (500*1000) /* 1/2 second */ +#endif + +#ifndef CONFIG_PAGING_STACKSIZE +# define CONFIG_PAGING_STACKSIZE CONFIG_IDLETHREAD_STACKSIZE +#endif + +#ifdef CONFIG_DISABLE_SIGNALS +# warning "Page fill support requires signals" +#endif + +/**************************************************************************** + * Public Types + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +#ifndef __ASSEMBLY + +/* This is the task IDof the page fill worker thread. This value was set in + * os_start when the page fill worker thread was started. + */ + +extern pid_t g_pgworker; + +/* The page fill worker thread maintains a static variable called g_pftcb. + * If no page fill is in progress, g_pftcb will be NULL. Otherwise, g_pftcb + * will point to the TCB of the task which is receiving the fill that is + * in progess. + * + * NOTE: I think that this is the only state in which a TCB does not reside + * in some list. Here is it in limbo, outside of the normally queuing while + * the page file is in progress. Where here, it will be marked with + * TSTATE_TASK_INVALID. + */ + +extern FAR _TCB *g_pftcb; + +/**************************************************************************** + * Public Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Name: pg_worker + * + * Description: + * This is the entry point of the worker thread that performs the actual + * page file. + * + * Input parameters: + * argc, argv (not used) + * + * Returned Value: + * Does not return + * + ****************************************************************************/ + +int pg_worker(int argc, char *argv[]); + +#endif /* __ASSEMBLY__ */ +#endif /* CONFIG_PAGING */ +#endif /* __SCHED_PG_INTERNAL_H */ |