NuttX RTOS

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 142 insertions, 0 deletions

diff --git a/nuttx/sched/sched_releasetcb.c b/nuttx/sched/sched_releasetcb.c
new file mode 100644
index 000000000..ffbfc6c58
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+++ b/nuttx/sched/sched_releasetcb.c
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+/************************************************************
+ * sched_releasetcb.c
+ *
+ *   Copyright (C) 2007 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 Gregory Nutt 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.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <sched.h>
+#include <errno.h>
+#include <nuttx/arch.h>
+#include "os_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:
+ *
+ ************************************************************/
+
+int sched_releasetcb(_TCB *tcb)
+{
+  int ret = OK;
+  int i;
+
+  if (tcb)
+    {
+      /* 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 */
+
+      if (tcb->stack_alloc_ptr)
+        {
+          up_release_stack(tcb);
+        }
+
+      /* Release command line arguments that were allocated
+       * for task start/re-start.
+       */
+
+      if ((tcb->flags & TCB_FLAG_PTHREAD) == 0)
+        {
+          for (i = 1; i < NUM_TASK_ARGS+1 && tcb->argv[i]; i++)
+            {
+              sched_free(tcb->argv[i]);
+            }
+        }
+
+      /* Release any allocated file structures */
+
+      ret = sched_releasefiles(tcb);
+
+      /* And, finally, release the TCB itself */
+
+      sched_free(tcb);
+    }
+  return ret;
+}
+
+
+