163 lines
5.3 KiB
C
163 lines
5.3 KiB
C
/****************************************************************************
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* sched/task/spawn.h
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*
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* Copyright (C) 2013 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_TASK_SPAWN_H
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#define __SCHED_TASK_SPAWN_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 <spawn.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_POSIX_SPAWN_PROXY_STACKSIZE
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# define CONFIG_POSIX_SPAWN_PROXY_STACKSIZE 1024
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#endif
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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struct spawn_parms_s
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{
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/* Common parameters */
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int result;
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FAR pid_t *pid;
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FAR const posix_spawn_file_actions_t *file_actions;
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FAR const posix_spawnattr_t *attr;
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FAR char * const *argv;
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/* Parameters that differ for posix_spawn[p] and task_spawn */
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union
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{
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struct
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{
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FAR const char *path;
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} posix;
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struct
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{
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FAR const char *name;
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main_t entry;
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} task;
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} u;
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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extern sem_t g_spawn_parmsem;
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#ifndef CONFIG_SCHED_WAITPID
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extern sem_t g_spawn_execsem;
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#endif
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extern struct spawn_parms_s g_spawn_parms;
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: spawn_semtake and spawn_semgive
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*
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* Description:
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* Give and take semaphores
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*
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* Input Parameters:
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*
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* sem - The semaphore to act on.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void spawn_semtake(FAR sem_t *sem);
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#define spawn_semgive(sem) nxsem_post(sem)
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/****************************************************************************
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* Name: spawn_execattrs
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*
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* Description:
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* Set attributes of the new child task after it has been spawned.
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*
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* Input Parameters:
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*
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* pid - The pid of the new task.
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* attr - The attributes to use
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*
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* Returned Value:
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* Errors are not reported by this function. This is because errors
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* cannot occur, but ratther that the new task has already been started
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* so there is no graceful way to handle errors detected in this context
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* (unless we delete the new task and recover).
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*
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* Assumptions:
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* That task has been started but has not yet executed because pre-
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* emption is disabled.
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*
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****************************************************************************/
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int spawn_execattrs(pid_t pid, FAR const posix_spawnattr_t *attr);
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/****************************************************************************
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* Name: spawn_proxyattrs
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*
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* Description:
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* Set attributes of the proxy task before it has started the new child
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* task.
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*
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* Input Parameters:
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*
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* pid - The pid of the new task.
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* attr - The attributes to use
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* file_actions - The attributes to use
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*
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* Returned Value:
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* 0 (OK) on successed; A negated errno value is returned on failure.
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*
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****************************************************************************/
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int spawn_proxyattrs(FAR const posix_spawnattr_t *attr,
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FAR const posix_spawn_file_actions_t *file_actions);
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#endif /* __SCHED_TASK_SPAWN_H */
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