New file missed in last check-in

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@5135 7fd9a85b-ad96-42d3-883c-3090e2eb8679

nuttx/mm/mm_grancritical.c

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+/****************************************************************************
+ * mm/mm_grancritical.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 <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+
+#include <arch/irq.h>
+#include <nuttx/gran.h>
+
+#include "mm_gran.h"
+
+#ifdef CONFIG_GRAN
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: gran_enter_critical and gran_leave_critical
+ *
+ * Description:
+ *   Critical section management for the granule allocator.
+ *
+ * Input Parameters:
+ *   priv - Pointer to the gran state
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+void gran_enter_critical(FAR struct gran_s *priv)
+{
+#ifdef CONFIG_GRAN_INTR
+  priv->irqstate = irqsave();
+#else
+  int ret;
+
+  /* Continue waiting if we are awakened by a signal */
+
+  do
+    {
+      ret = sem_wait(&priv->exclsem);
+      if (ret < 0)
+        {
+          DEBUGASSERT(errno == EINTR);
+        }
+    }
+  while (ret < 0);
+#endif
+}
+
+void gran_leave_critical(FAR struct gran_s *priv)
+{
+#ifdef CONFIG_GRAN_INTR
+  irqrestore(priv->irqstate);
+#else
+  sem_post(&priv->exclsem);
+#endif
+}
+
+
+#endif /* CONFIG_GRAN */
+
+