text: /****************************************************************************
   * sched/task/spawn.h
   *
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.  The
   * ASF licenses this file to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance with the
   * License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
   * License for the specific language governing permissions and limitations
   * under the License.
   *
   ****************************************************************************/
  
  #ifndef __SCHED_TASK_SPAWN_H
  #define __SCHED_TASK_SPAWN_H
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  #include <spawn.h>
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  #ifndef CONFIG_POSIX_SPAWN_PROXY_STACKSIZE
  #  define CONFIG_POSIX_SPAWN_PROXY_STACKSIZE 1024
  #endif
  
  /****************************************************************************
   * Public Type Definitions
   ****************************************************************************/
  
  struct spawn_parms_s
  {
    /* Common parameters */
  
    int result;
    FAR pid_t *pid;
    FAR const posix_spawn_file_actions_t *file_actions;
    FAR const posix_spawnattr_t *attr;
    FAR char * const *argv;
  
    /* Parameters that differ for posix_spawn[p] and task_spawn */
  
    union
    {
      struct
      {
        FAR const char *path;
      } posix;
      struct
      {
        FAR const char *name;
        main_t entry;
      } task;
    } u;
  };
  
  /****************************************************************************
   * Public Data
   ****************************************************************************/
  
  extern sem_t g_spawn_parmsem;
  #ifndef CONFIG_SCHED_WAITPID
  extern sem_t g_spawn_execsem;
  #endif
  extern struct spawn_parms_s g_spawn_parms;
  
  /****************************************************************************
   * Public Function Prototypes
   ****************************************************************************/
  
  /****************************************************************************
   * Name: spawn_semtake and spawn_semgive
   *
   * Description:
   *   Give and take semaphores
   *
   * Input Parameters:
   *
   *   sem - The semaphore to act on.
   *
   * Returned Value:
   *   None
   *
   ****************************************************************************/
  
  int spawn_semtake(FAR sem_t *sem);
  #define spawn_semgive(sem) nxsem_post(sem)
  
  /****************************************************************************
   * Name: spawn_execattrs
   *
   * Description:
   *   Set attributes of the new child task after it has been spawned.
   *
   * Input Parameters:
   *
   *   pid - The pid of the new task.
   *   attr - The attributes to use
   *
   * Returned Value:
   *   Errors are not reported by this function.  This is because errors
   *   cannot occur, but ratther that the new task has already been started
   *   so there is no graceful way to handle errors detected in this context
   *   (unless we delete the new task and recover).
   *
   * Assumptions:
   *   That task has been started but has not yet executed because pre-
   *   emption is disabled.
   *
   ****************************************************************************/
  
  int spawn_execattrs(pid_t pid, FAR const posix_spawnattr_t *attr);
  
  /****************************************************************************
   * Name: spawn_proxyattrs
   *
   * Description:
   *   Set attributes of the proxy task before it has started the new child
   *   task.
   *
   * Input Parameters:
   *
   *   pid - The pid of the new task.
   *   attr - The attributes to use
   *   file_actions - The attributes to use
   *
   * Returned Value:
   *   0 (OK) on success; A negated errno value is returned on failure.
   *
   ****************************************************************************/
  
  int spawn_proxyattrs(FAR const posix_spawnattr_t *attr,
                       FAR const posix_spawn_file_actions_t *file_actions);
  
  #endif /* __SCHED_TASK_SPAWN_H */
  