Add memory usage monitor to USB storage example

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3817 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 47 insertions, 0 deletions

diff --git a/apps/examples/usbstorage/usbstrg.h b/apps/examples/usbstorage/usbstrg.h
index 4b50dfe77..a179bc054 100644
--- a/apps/examples/usbstorage/usbstrg.h
+++ b/apps/examples/usbstorage/usbstrg.h
@@ -41,6 +41,7 @@
  ****************************************************************************/
 
 #include <nuttx/config.h>
+#include <stdlib.h>
 
 /****************************************************************************
  * Pre-Processor Definitions
@@ -101,6 +102,52 @@
 #endif
 
 /****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/* All global variables used by this example are packed into a structure in
+ * order to avoid name collisions.
+ */
+
+#if defined(CONFIG_EXAMPLES_USBSTRG_BUILTIN) || defined(CONFIG_EXAMPLES_USBSTRG_DEBUGMM)
+struct usbstrg_state_s
+{
+  /* This is the handle that references to this particular USB storage driver
+   * instance.  It is only needed if the USB mass storage device example is
+   * built using CONFIG_EXAMPLES_USBSTRG_BUILTIN.  In this case, the value
+   * of the driver handle must be remembered between the 'msconn' and 'msdis'
+   * commands.
+   */
+
+#ifdef CONFIG_EXAMPLES_USBSTRG_BUILTIN
+  FAR void *mshandle;
+#endif
+
+  /* Heap usage samples.  These are useful for checking USB storage memory
+   * usage and for tracking down memoryh leaks.
+   */
+
+#ifdef CONFIG_EXAMPLES_USBSTRG_DEBUGMM
+  struct mallinfo mmstart;    /* Memory usage before the connection */
+  struct mallinfo mmprevious; /* The last memory usage sample */
+  struct mallinfo mmcurrent;  /* The current memory usage sample */
+#endif
+};
+#endif
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/* All global variables used by this example are packed into a structure in
+ * order to avoid name collisions.
+ */
+
+#if defined(CONFIG_EXAMPLES_USBSTRG_BUILTIN) || defined(CONFIG_EXAMPLES_USBSTRG_DEBUGMM)
+extern struct usbstrg_state_s g_usbstrg;
+#endif
+
+/****************************************************************************
  * Public Functions
  ****************************************************************************/