px4-firmware/apps/examples/thttpd/content/tasks/tasks.c

/****************************************************************************
 * examples/thttpd/tasks/tasks.c
 *
 *   Copyright (C) 2009, 2011 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sched.h>

/****************************************************************************
 * Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Types
 ****************************************************************************/

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

static const char *g_statenames[] =
{
  "INVALID ",
  "PENDING ",
  "READY   ", 
  "RUNNING ", 
  "INACTIVE", 
  "WAITSEM ", 
#ifndef CONFIG_DISABLE_MQUEUE
  "WAITSIG ", 
#endif
#ifndef CONFIG_DISABLE_MQUEUE
  "MQNEMPTY", 
  "MQNFULL "
#endif
};

static const char *g_ttypenames[4] =
{
  "TASK   ",
  "PTHREAD",
  "KTHREAD",
  "--?--  "
};

/****************************************************************************
 * Public Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/* NOTEs:
 *
 * 1. One limitation in the use of NXFLAT is that functions that are
 *    referenced as a pointer-to-a-function must have global scope.  Otherwise
 *    ARM GCC will generate some bad logic.
 * 2. In general, when called back, there is no guarantee to that PIC registers
 *    will be valid and, unless you take special precautions, it could be
 *    dangerous to reference global variables in the callback function.
 */

/* static */ void show_task(FAR _TCB *tcb, FAR void *arg)
{
  int i;

  /* Show task status */

  printf("%5d %3d %4s %7s%c%c %8s ",
         tcb->pid, tcb->sched_priority,
         tcb->flags & TCB_FLAG_ROUND_ROBIN ? "RR  " : "FIFO",
         g_ttypenames[(tcb->flags & TCB_FLAG_TTYPE_MASK) >> TCB_FLAG_TTYPE_SHIFT],
         tcb->flags & TCB_FLAG_NONCANCELABLE ? 'N' : ' ',
         tcb->flags & TCB_FLAG_CANCEL_PENDING ? 'P' : ' ',
         g_statenames[tcb->task_state]);

  /* Show task name and arguments */

  printf("%s(", tcb->argv[0]);

  /* Special case 1st argument (no comma) */

  if (tcb->argv[1])
    {
     printf("%p", tcb->argv[1]);
    }

  /* Then any additional arguments */

#if CONFIG_MAX_TASK_ARGS > 2
  for (i = 2; i <= CONFIG_MAX_TASK_ARGS && tcb->argv[i]; i++)
    {
      printf(", %p", tcb->argv[i]);
     }
#endif
  printf(")\n");
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

int main(int argc, char *argv[])
{
  puts(
	"Content-type: text/html\r\n"
	"Status: 200/html\r\n"
	"\r\n"
    "<html>\r\n"
      "<head>\r\n"
        "<title>NuttX Tasks</title>\r\n"
        "<link rel=\"stylesheet\" type=\"text/css\" href=\"/style.css\">\r\n"
      "</head>\r\n"
      "<body bgcolor=\"#fffeec\" text=\"black\">\r\n"
        "<div class=\"menu\">\r\n"
        "<div class=\"menubox\"><a href=\"/index.html\">Front page</a></div>\r\n"
        "<div class=\"menubox\"><a href=\"hello\">Say Hello</a></div>\r\n"
        "<div class=\"menubox\"><a href=\"tasks\">Tasks</a></div>\r\n"
        "<div class=\"menubox\"><a href=\"netstat\">Network status</a></div>\r\n"
        "<br>\r\n"
        "</div>\r\n"
        "<div class=\"contentblock\">\r\n"
        "<pre>\r\n"
        "PID   PRI SCHD TYPE   NP STATE    NAME\r\n");

  sched_foreach(show_task, NULL);

  puts(
        "</pre>\r\n"
      "</body>\r\n"
   "</html>\r\n");
  return 0;
}