297 lines
8.5 KiB
C
297 lines
8.5 KiB
C
/************************************************************
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* task_setup.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 Gregory Nutt 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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/************************************************************
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* Included Files
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************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <sched.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include "os_internal.h"
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/************************************************************
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* Definitions
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************************************************************/
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/************************************************************
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* Private Type Declarations
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************************************************************/
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/************************************************************
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* Global Variables
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************************************************************/
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/************************************************************
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* Private Variables
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************************************************************/
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/* This is the name for un-named tasks */
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static const char g_noname[] = "<noname>";
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/************************************************************
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* Private Function Prototypes
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************************************************************/
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static STATUS task_assignpid(FAR _TCB* tcb);
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/************************************************************
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* Private Functions
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************************************************************/
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/************************************************************
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* Name: task_assignpid
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*
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* Description:
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* This function assigns the next unique task ID to a task.
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*
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* Inputs:
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* tcb - TCB of task
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*
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* Return:
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* OK on success; ERROR on failure (errno is not set)
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*
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************************************************************/
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static STATUS task_assignpid(FAR _TCB *tcb)
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{
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pid_t next_pid;
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int hash_ndx;
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int tries = 0;
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/* Disable pre-emption. This should provide sufficient protection
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* for the following operation.
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*/
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(void)sched_lock();
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/* We'll try every allowable pid */
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for (tries = 0; tries < CONFIG_MAX_TASKS; tries++)
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{
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/* Get the next process ID candidate */
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next_pid = ++g_lastpid;
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/* Verify that the next_pid is in the valid range */
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if (next_pid <= 0)
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{
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g_lastpid = 1;
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next_pid = 1;
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}
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/* Get the hash_ndx associated with the next_pid */
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hash_ndx = PIDHASH(next_pid);
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/* Check if there is a (potential) duplicate of this pid */
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if (!g_pidhash[hash_ndx].tcb)
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{
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g_pidhash[hash_ndx].tcb = tcb;
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g_pidhash[hash_ndx].pid = next_pid;
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tcb->pid = next_pid;
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(void)sched_unlock();
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return OK;
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}
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}
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/* If we get here, then the g_pidhash[] table is completely full.
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* We cannot allow another task to be started.
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*/
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(void)sched_unlock();
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return ERROR;
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}
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/************************************************************
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* Public Functions
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************************************************************/
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/************************************************************
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* Name: task_schedsetup
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*
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* Description:
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* This functions initializes a Task Control Block (TCB)
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* in preparation for starting a new thread.
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*
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* task_schedsetup() is called from task_init(),
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* task_start(), and pthread_create();
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*
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* Input Parameters:
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* tcb - Address of the new task's TCB
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* priority - Priority of the new task
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* entry - Entry point of a new task
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* main - Application start point of the new task
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*
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* Return Value:
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* OK on success; ERROR on failure.
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*
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* This function can only failure is it is unable to assign
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* a new, unique task ID to the TCB (errno is not set).
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*
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************************************************************/
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STATUS task_schedsetup(FAR _TCB *tcb, int priority,
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start_t start, main_t main)
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{
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STATUS ret;
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/* Assign a unique task ID to the task. */
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ret = task_assignpid(tcb);
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if (ret == OK)
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{
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/* Save task priority and entry point in the TCB */
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tcb->init_priority = (ubyte)priority;
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tcb->sched_priority = (ubyte)priority;
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tcb->start = start;
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tcb->entry.main = main;
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/* exec() and pthread_create() inherit the signal mask of the
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* parent thread. I suppose that task_create() should as well.
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*/
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#ifndef CONFIG_DISABLE_SIGNALS
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(void)sigprocmask(SIG_SETMASK, NULL, &tcb->sigprocmask);
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#endif
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/* Initialize the task state. It does not get a valid state
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* until it is activated.
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*/
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tcb->task_state = TSTATE_TASK_INVALID;
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/* Initialize the processor-specific portion of the TCB */
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up_initial_state(tcb);
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/* Add the task to the inactive task list */
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sched_lock();
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dq_addfirst((FAR dq_entry_t*)tcb, (dq_queue_t*)&g_inactivetasks);
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tcb->task_state = TSTATE_TASK_INACTIVE;
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sched_unlock();
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}
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return ret;
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}
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/************************************************************
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* Name: task_argsetup
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*
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* Description:
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* This functions sets up parameters in the Task Control
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* Block (TCB) in preparation for starting a new thread.
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*
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* task_argsetup() is called only from task_init() and
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* task_start() to create a new task. Argumens are
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* cloned via strdup.
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*
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* Input Parameters:
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* tcb - Address of the new task's TCB
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* name - Name of the new task (not used)
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* argv - A pointer to an array of input parameters.
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* Up to CONFIG_MAX_TASK_ARG parameters may be
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* provided. If fewer than CONFIG_MAX_TASK_ARG
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* parameters are passed, the list should be
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* terminated with a NULL argv[] value.
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* If no parameters are required, argv may be NULL.
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*
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* Return Value:
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* OK
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*
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************************************************************/
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STATUS task_argsetup(FAR _TCB *tcb, const char *name, const char *argv[])
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{
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int i;
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#if CONFIG_TASK_NAME_SIZE > 0
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/* Give a name to the unnamed tasks */
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if (!name)
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{
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name = (char *)g_noname;
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}
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/* Copy the name into the TCB */
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strncpy(tcb->name, name, CONFIG_TASK_NAME_SIZE);
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/* Save the name as the first argument */
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tcb->argv[0] = tcb->name;
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#else
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/* Save the name as the first argument */
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tcb->argv[0] = (char *)g_noname;
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#endif /* CONFIG_TASK_NAME_SIZE */
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/* For tasks, the life of the argument must be as long as
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* the life of the task and the arguments must be strings.
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* So for tasks, we have to to dup the strings.
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*
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* The first NULL argument terminates the list of
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* arguments. The argv pointer may be NULL if no
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* parameters are passed.
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*/
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i = 1;
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if (argv)
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{
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for (; i < CONFIG_MAX_TASK_ARGS+1 && argv[i-1]; i++)
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{
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tcb->argv[i] = strdup(argv[i-1]);
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}
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}
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/* Nullify any unused argument storage */
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for (; i < CONFIG_MAX_TASK_ARGS+1; i++)
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{
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tcb->argv[i] = NULL;
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}
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return OK;
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}
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