140 lines
4.1 KiB
C
140 lines
4.1 KiB
C
/****************************************************************************
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* sched/task/task_start.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <stdlib.h>
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#include <sched.h>
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#include <assert.h>
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#include <debug.h>
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#include <string.h>
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#include <nuttx/arch.h>
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#include <nuttx/sched.h>
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#include "group/group.h"
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#include "sched/sched.h"
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#include "signal/signal.h"
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#include "task/task.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* This is an artificial limit to detect error conditions where an argv[]
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* list is not properly terminated.
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*/
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#define MAX_START_ARGS 256
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/****************************************************************************
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* Private Functions
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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: nxtask_start
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*
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* Description:
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* This function is the low level entry point into the main thread of
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* execution of a task. It receives initial control when the task is
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* started and calls main entry point of the newly started task.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void nxtask_start(void)
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{
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FAR struct task_tcb_s *tcb = (FAR struct task_tcb_s *)this_task();
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int exitcode = EXIT_FAILURE;
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int argc;
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DEBUGASSERT((tcb->cmn.flags & TCB_FLAG_TTYPE_MASK) != \
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TCB_FLAG_TTYPE_PTHREAD);
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#ifdef CONFIG_SIG_DEFAULT
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/* Set up default signal actions */
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nxsig_default_initialize(&tcb->cmn);
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#endif
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/* Execute the start hook if one has been registered */
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#ifdef CONFIG_SCHED_STARTHOOK
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if (tcb->starthook != NULL)
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{
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tcb->starthook(tcb->starthookarg);
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}
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#endif
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/* Count how many non-null arguments we are passing. The first non-null
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* argument terminates the list .
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*/
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argc = 1;
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while (tcb->argv[argc])
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{
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/* Increment the number of args. Here is a sanity check to
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* prevent running away with an unterminated argv[] list.
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* MAX_START_ARGS should be sufficiently large that this never
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* happens in normal usage.
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*/
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if (++argc > MAX_START_ARGS)
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{
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exit(EXIT_FAILURE);
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}
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}
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/* Call the 'main' entry point passing argc and argv. In the kernel build
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* this has to be handled differently if we are starting a user-space task;
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* we have to switch to user-mode before calling the task.
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*/
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if ((tcb->cmn.flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_KERNEL)
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{
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exitcode = tcb->cmn.entry.main(argc, tcb->argv);
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}
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else
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{
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#ifdef CONFIG_BUILD_FLAT
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nxtask_startup(tcb->cmn.entry.main, argc, tcb->argv);
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#else
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up_task_start(tcb->cmn.entry.main, argc, tcb->argv);
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#endif
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}
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/* Call exit() if/when the task returns */
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exit(exitcode);
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}
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