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