stats - Added stack stats api for individual threads

Added the following
- size_t mbed_stats_stack_get_each(mbed_stats_stack_t *, size_t)

platform/mbed_stats.c

@@ -30,8 +30,40 @@ void mbed_stats_stack_get(mbed_stats_stack_t *stats)
 
         stats->stack_cnt += 1;
     }
-#elif MBED_STACK_STATS_ENABLED
-#warning Stack statistics are not supported without the rtos.
 #endif
 }
 
+size_t mbed_stats_stack_get_each(mbed_stats_stack_t *stats, size_t count)
+{
+    memset(stats, 0, count*sizeof(mbed_stats_stack_t));
+    size_t i = 0;
+
+#if MBED_STACK_STATS_ENABLED && MBED_CONF_RTOS_PRESENT
+    osThreadEnumId enumid = _osThreadsEnumStart();
+    osThreadId threadid;
+
+    while ((threadid = _osThreadEnumNext(enumid)) && i < count) {
+        osEvent e;
+
+        e = _osThreadGetInfo(threadid, osThreadInfoStackMax);
+        if (e.status == osOK) {
+           stats[i].max_size = (uint32_t)e.value.p;
+        }
+
+        e = _osThreadGetInfo(threadid, osThreadInfoStackSize);
+        if (e.status == osOK) {
+           stats[i].reserved_size = (uint32_t)e.value.p;
+        }
+
+        stats[i].thread_id = (uint32_t)threadid;
+        stats[i].stack_cnt = 1;
+        i += 1;
+    }
+#endif
+
+    return i;
+}
+
+#if MBED_STACK_STATS_ENABLED && !MBED_CONF_RTOS_PRESENT
+#warning Stack statistics are currently not supported without the rtos.
+#endif

platform/mbed_stats.h

@@ -19,6 +19,7 @@
 #ifndef MBED_STATS_H
 #define MBED_STATS_H
 #include <stdint.h>
+#include <stddef.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -39,6 +40,7 @@ typedef struct {
 void mbed_stats_heap_get(mbed_stats_heap_t *stats);
 
 typedef struct {
+    uint32_t thread_id;         /**< Identifier for thread that owns the stack. */
     uint32_t max_size;          /**< Sum of the maximum number of bytes used in each stack. */
     uint32_t reserved_size;     /**< Current number of bytes allocated for all stacks. */
     uint32_t stack_cnt;         /**< Number of stacks currently allocated. */
@@ -49,6 +51,12 @@ typedef struct {
  */
 void mbed_stats_stack_get(mbed_stats_stack_t *stats);
 
+/**
+ * Fill the passed array of stat structures with the stack stats
+ * for each available stack.
+ */
+size_t mbed_stats_stack_get_each(mbed_stats_stack_t *stats, size_t count);
+
 #ifdef __cplusplus
 }
 #endif