1 files changed, 117 insertions, 0 deletions
diff --git a/nuttx/sched/mq_recover.c b/nuttx/sched/mq_recover.c
new file mode 100644
index 000000000..040ded64c
--- /dev/null
+++ b/nuttx/sched/mq_recover.c
@@ -0,0 +1,117 @@
+/************************************************************************
+ * sched/mq_recover.c
+ *
+ *   Copyright (C) 2012 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 <assert.h>
+
+#include <nuttx/mqueue.h>
+#include <nuttx/sched.h>
+
+#include "mq_internal.h"
+
+/************************************************************************
+ * Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Type Declarations
+ ************************************************************************/
+
+/************************************************************************
+ * Global Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: mq_recover
+ *
+ * Description:
+ *   This function is called when a task is deleted via task_deleted or
+ *   via pthread_cancel. I checks if the task was waiting for a message
+ *   queue event and adjusts counts appropriately.
+ *
+ * Inputs:
+ *   tcb - The TCB of the terminated task or thread
+ *
+ * Return Value:
+ *   None.
+ *
+ * Assumptions:
+ *   This function is called from task deletion logic in a safe context.
+ *
+ ************************************************************************/
+
+void mq_recover(FAR struct tcb_s *tcb)
+{
+  /* TODO:  What if it was waiting for a timed message queue event?
+   * We might need the wdog in the TCB so that we can cancel timeouts.
+   */
+ 
+  /* Was the task waiting for a message queue to become non-empty? */
+
+  if (tcb->task_state == TSTATE_WAIT_MQNOTEMPTY)
+    {
+      /* Decrement the count of waiters */
+
+      DEBUGASSERT(tcb->msgwaitq && tcb->msgwaitq->nwaitnotempty > 0);
+      tcb->msgwaitq->nwaitnotempty--;
+    }
+
+  /* Was the task waiting for a message queue to become non-full? */
+
+  else if (tcb->task_state == TSTATE_WAIT_MQNOTFULL)
+    {
+      /* Decrement the count of waiters */
+
+      DEBUGASSERT(tcb->msgwaitq && tcb->msgwaitq->nwaitnotfull > 0);
+      tcb->msgwaitq->nwaitnotfull--;
+    }
+}