d2b2a82171
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@58 42af7a65-404d-4744-a932-0658087f49c3
313 lines
9.0 KiB
C
313 lines
9.0 KiB
C
/************************************************************
|
|
* task_setup.c
|
|
*
|
|
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
*
|
|
* 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 Gregory Nutt 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 <sys/types.h>
|
|
#include <sched.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
#include <nuttx/arch.h>
|
|
#include "os_internal.h"
|
|
|
|
/************************************************************
|
|
* Definitions
|
|
************************************************************/
|
|
|
|
/************************************************************
|
|
* Private Type Declarations
|
|
************************************************************/
|
|
|
|
/************************************************************
|
|
* Global Variables
|
|
************************************************************/
|
|
|
|
/************************************************************
|
|
* Private Variables
|
|
************************************************************/
|
|
|
|
/* This is the name for un-named tasks */
|
|
|
|
static FAR char g_noname[] = "no name";
|
|
|
|
/************************************************************
|
|
* Private Function Prototypes
|
|
************************************************************/
|
|
|
|
static STATUS task_assignpid(FAR _TCB* tcb);
|
|
|
|
/************************************************************
|
|
* Private Functions
|
|
************************************************************/
|
|
|
|
/************************************************************
|
|
* Name: task_assignpid
|
|
*
|
|
* Description:
|
|
* This function assigns the next unique task ID to a task.
|
|
*
|
|
* Inputs:
|
|
* tcb - TCB of task
|
|
*
|
|
* Return:
|
|
* OK on success; ERROR on failure (errno is not set)
|
|
*
|
|
************************************************************/
|
|
|
|
static STATUS task_assignpid(FAR _TCB *tcb)
|
|
{
|
|
pid_t next_pid;
|
|
int hash_ndx;
|
|
int tries = 0;
|
|
|
|
/* Disable pre-emption. This should provide sufficient protection
|
|
* for the following operation.
|
|
*/
|
|
|
|
(void)sched_lock();
|
|
|
|
/* We'll try every allowable pid */
|
|
|
|
for (tries = 0; tries < CONFIG_MAX_TASKS; tries++)
|
|
{
|
|
/* Get the next process ID candidate */
|
|
|
|
next_pid = ++g_lastpid;
|
|
|
|
/* Verify that the next_pid is in the valid range */
|
|
|
|
if (next_pid <= 0)
|
|
{
|
|
g_lastpid = 1;
|
|
next_pid = 1;
|
|
}
|
|
|
|
/* Get the hash_ndx associated with the next_pid */
|
|
|
|
hash_ndx = PIDHASH(next_pid);
|
|
|
|
/* Check if there is a (potential) duplicate of this pid */
|
|
|
|
if (!g_pidhash[hash_ndx].tcb)
|
|
{
|
|
g_pidhash[hash_ndx].tcb = tcb;
|
|
g_pidhash[hash_ndx].pid = next_pid;
|
|
tcb->pid = next_pid;
|
|
(void)sched_unlock();
|
|
return OK;
|
|
}
|
|
}
|
|
|
|
/* If we get here, then the g_pidhash[] table is completely full.
|
|
* We cannot allow another task to be started.
|
|
*/
|
|
|
|
(void)sched_unlock();
|
|
return ERROR;
|
|
}
|
|
|
|
/************************************************************
|
|
* Public Functions
|
|
************************************************************/
|
|
|
|
/************************************************************
|
|
* Name: task_schedsetup
|
|
*
|
|
* Description:
|
|
* This functions initializes a Task Control Block (TCB)
|
|
* in preparation for starting a new thread.
|
|
*
|
|
* task_schedsetup() is called from task_init(),
|
|
* task_start(), and pthread_create();
|
|
*
|
|
* Input Parameters:
|
|
* tcb - Address of the new task's TCB
|
|
* priority - Priority of the new task
|
|
* entry - Entry point of a new task
|
|
* main - Application start point of the new task
|
|
*
|
|
* Return Value:
|
|
* OK on success; ERROR on failure.
|
|
*
|
|
* This function can only failure is it is unable to assign
|
|
* a new, unique task ID to the TCB (errno is not set).
|
|
*
|
|
************************************************************/
|
|
|
|
STATUS task_schedsetup(FAR _TCB *tcb, int priority,
|
|
start_t start, main_t main)
|
|
{
|
|
STATUS ret;
|
|
|
|
/* Assign a unique task ID to the task. */
|
|
|
|
ret = task_assignpid(tcb);
|
|
if (ret == OK)
|
|
{
|
|
/* Save task priority and entry point in the TCB */
|
|
|
|
tcb->init_priority = (ubyte)priority;
|
|
tcb->sched_priority = (ubyte)priority;
|
|
tcb->start = start;
|
|
tcb->entry.main = main;
|
|
|
|
/* Initialize other (non-zero) elements of the TCB */
|
|
|
|
#ifndef CONFIG_DISABLE_SIGNALS
|
|
tcb->sigprocmask = ALL_SIGNAL_SET;
|
|
#endif
|
|
tcb->task_state = TSTATE_TASK_INVALID;
|
|
|
|
/* Initialize the processor-specific portion of the TCB */
|
|
|
|
up_initial_state(tcb);
|
|
|
|
/* Add the task to the inactive task list */
|
|
|
|
sched_lock();
|
|
dq_addfirst((FAR dq_entry_t*)tcb, &g_inactivetasks);
|
|
tcb->task_state = TSTATE_TASK_INACTIVE;
|
|
sched_unlock();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/************************************************************
|
|
* Name: task_argsetup
|
|
*
|
|
* Description:
|
|
* This functions sets up parameters in the Task Control
|
|
* Block (TCB) in preparation for starting a new thread.
|
|
*
|
|
* task_argsetup() is called from task_init() and task_start()
|
|
* to create a new task (with arguments cloned via strdup)
|
|
* or pthread_create() which has one argument passed by
|
|
* value (distinguished by the pthread boolean argument).
|
|
*
|
|
* Input Parameters:
|
|
* tcb - Address of the new task's TCB
|
|
* name - Name of the new task (not used)
|
|
* pthread - TRUE is the task emulates pthread behavior
|
|
* argv - A pointer to an array of input parameters.
|
|
* Up to CONFIG_MAX_TASK_ARG parameters may be
|
|
* provided. If fewer than CONFIG_MAX_TASK_ARG
|
|
* parameters are passed, the list should be
|
|
* terminated with a NULL argv[] value.
|
|
* If no parameters are required, argv may be NULL.
|
|
*
|
|
* Return Value:
|
|
* OK
|
|
*
|
|
************************************************************/
|
|
|
|
STATUS task_argsetup(FAR _TCB *tcb, const char *name,
|
|
boolean pthread, char *argv[])
|
|
{
|
|
int i;
|
|
|
|
#if CONFIG_TASK_NAME_SIZE > 0
|
|
/* Give a name to the unnamed threads */
|
|
|
|
if (!name)
|
|
{
|
|
name = g_noname;
|
|
}
|
|
|
|
/* copy the name into the TCB */
|
|
|
|
strncpy(tcb->name, name, CONFIG_TASK_NAME_SIZE);
|
|
#endif /* CONFIG_TASK_NAME_SIZE */
|
|
|
|
/* Save the arguments in the TCB */
|
|
|
|
#if CONFIG_TASK_NAME_SIZE > 0
|
|
tcb->argv[0] = tcb->name;
|
|
#else
|
|
tcb->argv[0] = g_noname;
|
|
#endif
|
|
|
|
/* For pthreads, args are strictly pass-by-value; the char*
|
|
* arguments wrap some unknown value cast to char*. However,
|
|
* for tasks, the life of the argument must be as long as
|
|
* the life of the task and the arguments must be strings.
|
|
* So for tasks, we have to to dup the strings.
|
|
*/
|
|
|
|
if (!pthread)
|
|
{
|
|
/* The first NULL argument terminates the list of
|
|
* arguments. The argv pointer may be NULL if no
|
|
* parameters are passed.
|
|
*/
|
|
|
|
i = 1;
|
|
if (argv)
|
|
{
|
|
for (; i < CONFIG_MAX_TASK_ARGS+1 && argv[i-1]; i++)
|
|
{
|
|
tcb->argv[i] = strdup(argv[i-1]);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Mark this task as a pthread */
|
|
|
|
tcb->flags |= TCB_FLAG_PTHREAD;
|
|
|
|
/* And just copy the argument. For pthreads, there
|
|
* is really only a single argument, argv[0]. It is
|
|
* copy as a value -- NOT duplicated.
|
|
*/
|
|
|
|
i = 2;
|
|
tcb->argv[1] = argv[0];
|
|
}
|
|
|
|
/* Nullify any unused argument storage */
|
|
|
|
for (; i < CONFIG_MAX_TASK_ARGS+1; i++)
|
|
{
|
|
tcb->argv[i] = NULL;
|
|
}
|
|
|
|
return OK;
|
|
}
|