181 lines
5.3 KiB
C
181 lines
5.3 KiB
C
/************************************************************************
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* sched/sched_releasetcb.c
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*
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* Copyright (C) 2007, 2009 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 NuttX 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 <errno.h>
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#include <nuttx/arch.h>
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#include "os_internal.h"
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#include "timer_internal.h"
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#include "env_internal.h"
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/************************************************************************
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* Private Functions
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************************************************************************/
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/************************************************************************
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* Name: sched_releasepid
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*
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* Description: When a task is destroyed, this function must
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* be called to make its process ID available for re-use.
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************************************************************************/
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static void sched_releasepid(pid_t pid)
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{
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int hash_ndx = PIDHASH(pid);
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/* Make any pid associated with this hash available. Note:
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* no special precautions need be taken here because the
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* following action is atomic
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*/
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g_pidhash[hash_ndx].tcb = NULL;
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g_pidhash[hash_ndx].pid = INVALID_PROCESS_ID;
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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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* Function: sched_releasetcb
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*
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* Description:
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* Free all resources contained in a TCB
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*
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* Parameters:
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* None
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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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* Assumptions:
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* Interrupts are disabled.
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*
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************************************************************************/
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int sched_releasetcb(FAR _TCB *tcb)
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{
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int ret = OK;
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int i;
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if (tcb)
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{
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/* Relase any timers that the task might hold. We do this
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* before release the PID because it may still be trying to
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* deliver signals (although interrupts are should be
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* disabled here).
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*/
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#ifndef CONFIG_DISABLE_POSIX_TIMERS
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#ifdef CONFIG_HAVE_WEAKFUNCTIONS
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if (timer_deleteall != NULL)
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#endif
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{
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timer_deleteall(tcb->pid);
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}
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#endif
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/* Release the task's process ID if one was assigned. PID
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* zero is reserved for the IDLE task. The TCB of the IDLE
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* task is never release so a value of zero simply means that
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* the process ID was never allocated to this TCB.
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*/
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if (tcb->pid)
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{
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sched_releasepid(tcb->pid);
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}
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/* Delete the thread's stack if one has been allocated */
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#ifndef CONFIG_CUSTOM_STACK
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if (tcb->stack_alloc_ptr)
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{
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up_release_stack(tcb);
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}
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#endif
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/* Delete the tasks's allocated DSpace region (external modules only) */
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#ifdef CONFIG_PIC
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if (tcb->dspace)
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{
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if (tcb->dspace->crefs <= 1)
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{
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sched_free(tcb->dspace);
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}
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else
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{
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tcb->dspace->crefs--;
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}
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}
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#endif
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/* Release command line arguments that were allocated for task
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* start/re-start.
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*/
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if ((tcb->flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_TASK)
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{
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for (i = 1; i < CONFIG_MAX_TASK_ARGS+1 && tcb->argv[i]; i++)
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{
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sched_free((FAR void*)tcb->argv[i]);
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}
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}
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/* Release any allocated file structures */
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ret = sched_releasefiles(tcb);
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/* Release environment variables */
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(void)env_release(tcb);
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/* And, finally, release the TCB itself */
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sched_free(tcb);
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}
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return ret;
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}
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