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Diffstat (limited to 'nuttx/sched/task_setup.c')
| -rw-r--r-- | nuttx/sched/task_setup.c | 468 |
1 files changed, 0 insertions, 468 deletions
diff --git a/nuttx/sched/task_setup.c b/nuttx/sched/task_setup.c deleted file mode 100644 index b770d46e6..000000000 --- a/nuttx/sched/task_setup.c +++ /dev/null @@ -1,468 +0,0 @@ -/**************************************************************************** - * sched/task_setup.c - * - * Copyright (C) 2007-2013 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 <sys/types.h> -#include <stdint.h> -#include <sched.h> -#include <string.h> -#include <errno.h> -#include <debug.h> - -#include <nuttx/arch.h> - -#include "os_internal.h" -#include "group_internal.h" - -/**************************************************************************** - * Definitions - ****************************************************************************/ - -/**************************************************************************** - * Private Type Declarations - ****************************************************************************/ - -/**************************************************************************** - * Global Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Variables - ****************************************************************************/ - -/* This is the name for un-named tasks */ - -static const char g_noname[] = "<noname>"; - -/**************************************************************************** - * Private Function Prototypes - ****************************************************************************/ - -static int 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 int task_assignpid(FAR _TCB *tcb) -{ - pid_t next_pid; - int hash_ndx; - int tries; - - /* 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; -} - -/**************************************************************************** - * Name: task_saveparent - * - * Description: - * Save the task ID of the parent task in the child task's TCB and allocate - * a child status structure to catch the child task's exit status. - * - * Parameters: - * tcb - The TCB of the new, child task. - * ttype - Type of the new thread: task, pthread, or kernel thread - * - * Returned Value: - * None - * - * Assumptions: - * The parent of the new task is the task at the head of the ready-to-run - * list. - * - ****************************************************************************/ - -#ifdef CONFIG_SCHED_HAVE_PARENT -static inline void task_saveparent(FAR _TCB *tcb, uint8_t ttype) -{ - FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head; - -#if defined(HAVE_GROUP_MEMBERS) || defined(CONFIG_SCHED_CHILD_STATUS) - DEBUGASSERT(tcb && tcb->group && rtcb->group); -#else -#endif - -#ifdef HAVE_GROUP_MEMBERS - /* Save the ID of the parent tasks' task group in the child's task group. - * Do nothing for pthreads. The parent and the child are both members of - * the same task group. - */ - - if ((tcb->flags & TCB_FLAG_TTYPE_MASK) != TCB_FLAG_TTYPE_PTHREAD) - { - /* This is a new task in a new task group, we have to copy the ID from - * the parent's task group structure to child's task group. - */ - - tcb->group->tg_pgid = rtcb->group->tg_gid; - } - -#else - DEBUGASSERT(tcb); - - /* Save the parent task's ID in the child task's TCB. I am not sure if - * this makes sense for the case of pthreads or not, but I don't think it - * is harmful in any event. - */ - - tcb->ppid = rtcb->pid; -#endif - -#ifdef CONFIG_SCHED_CHILD_STATUS - /* Tasks can also suppress retention of their child status by applying - * the SA_NOCLDWAIT flag with sigaction(). - */ - - if ((rtcb->group->tg_flags && GROUP_FLAG_NOCLDWAIT) == 0) - { - FAR struct child_status_s *child; - - /* Make sure that there is not already a structure for this PID in the - * parent TCB. There should not be. - */ - - child = group_findchild(rtcb->group, tcb->pid); - DEBUGASSERT(!child); - if (!child) - { - /* Allocate a new status structure */ - - child = group_allocchild(); - } - - /* Did we successfully find/allocate the child status structure? */ - - DEBUGASSERT(child); - if (child) - { - /* Yes.. Initialize the structure */ - - child->ch_flags = ttype; - child->ch_pid = tcb->pid; - child->ch_status = 0; - - /* Add the entry into the TCB list of children */ - - group_addchild(rtcb->group, child); - } - } -#else - DEBUGASSERT(rtcb->nchildren < UINT16_MAX); - rtcb->nchildren++; -#endif -} -#else -# define task_saveparent(tcb,ttype) -#endif - -/**************************************************************************** - * Name: task_dupdspace - * - * Description: - * When a new task or thread is created from a PIC module, then that - * module (probably) intends the task or thread to execute in the same - * D-Space. This function will duplicate the D-Space for that purpose. - * - * Parameters: - * tcb - The TCB of the new task. - * - * Returned Value: - * None - * - * Assumptions: - * The parent of the new task is the task at the head of the ready-to-run - * list. - * - ****************************************************************************/ - -#ifdef CONFIG_PIC -static inline void task_dupdspace(FAR _TCB *tcb) -{ - FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head; - if (rtcb->dspace != NULL) - { - /* Copy the D-Space structure reference and increment the reference - * count on the memory. The D-Space memory will persist until the - * last thread exits (see sched_releasetcb()). - */ - - tcb->dspace = rtcb->dspace; - tcb->dspace->crefs++; - } -} -#else -# define task_dupdspace(tcb) -#endif - -/**************************************************************************** - * 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 - * ttype - Type of the new thread: task, pthread, or kernel thread - * - * 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). - * - ****************************************************************************/ - -int task_schedsetup(FAR _TCB *tcb, int priority, start_t start, main_t main, - uint8_t ttype) -{ - int 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 = (uint8_t)priority; - tcb->sched_priority = (uint8_t)priority; -#ifdef CONFIG_PRIORITY_INHERITANCE - tcb->base_priority = (uint8_t)priority; -#endif - tcb->start = start; - tcb->entry.main = main; - - /* Save the thrad type. This setting will be needed in - * up_initial_state() is called. - */ - - ttype &= TCB_FLAG_TTYPE_MASK; - tcb->flags &= ~TCB_FLAG_TTYPE_MASK; - tcb->flags |= ttype; - - /* Save the task ID of the parent task in the TCB and allocate - * a child status structure. - */ - - task_saveparent(tcb, ttype); - - /* exec(), pthread_create(), task_create(), and vfork() all - * inherit the signal mask of the parent thread. - */ - -#ifndef CONFIG_DISABLE_SIGNALS - (void)sigprocmask(SIG_SETMASK, NULL, &tcb->sigprocmask); -#endif - - /* Initialize the task state. It does not get a valid state - * until it is activated. - */ - - tcb->task_state = TSTATE_TASK_INVALID; - - /* Clone the parent tasks D-Space (if it was running PIC). This - * must be done before calling up_initial_state() so that the - * state setup will take the PIC address base into account. - */ - - task_dupdspace(tcb); - - /* 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, (dq_queue_t*)&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 only from task_init() and - * task_start() to create a new task. Argumens are - * cloned via strdup. - * - * Input Parameters: - * tcb - Address of the new task's TCB - * name - Name of the new task (not used) - * 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 - * - ****************************************************************************/ - -int task_argsetup(FAR _TCB *tcb, const char *name, const char *argv[]) -{ - int i; - -#if CONFIG_TASK_NAME_SIZE > 0 - /* Give a name to the unnamed tasks */ - - if (!name) - { - name = (char *)g_noname; - } - - /* Copy the name into the TCB */ - - strncpy(tcb->name, name, CONFIG_TASK_NAME_SIZE); - - /* Save the name as the first argument */ - - tcb->argv[0] = tcb->name; -#else - /* Save the name as the first argument */ - - tcb->argv[0] = (char *)g_noname; -#endif /* CONFIG_TASK_NAME_SIZE */ - - /* 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. - * - * 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]); - } - } - - /* Nullify any unused argument storage */ - - for (; i < CONFIG_MAX_TASK_ARGS+1; i++) - { - tcb->argv[i] = NULL; - } - - return OK; -} |