Statically allocate ARMCC required mutex objects

Author: SenRamakri

rtos/TARGET_CORTEX/mbed_boot.c

@@ -423,9 +423,6 @@ void __rt_entry (void) {
     mbed_start_main();
 }
 
-typedef void *mutex;
-mutex _static_mutexes[OS_MUTEX_NUM] = {NULL};
-
 /* ARM toolchain requires dynamically created mutexes to enforce thread safety. There's
    up to 8 static mutexes, protecting atexit, signalinit, stdin, stdout, stderr, stream_list,
    fp_trap_init and the heap. Additionally for each call to fopen one extra mutex will be
@@ -436,6 +433,12 @@ mutex _static_mutexes[OS_MUTEX_NUM] = {NULL};
    worry about freeing the allocated memory as library mutexes are only freed when the
    application finishes executing.
  */
+
+typedef void *mutex;
+#define OS_MUTEX_STATIC_NUM   8
+mutex _static_mutexes[OS_MUTEX_STATIC_NUM] = {NULL};
+mbed_rtos_storage_mutex_t _static_mutexes_mem[OS_MUTEX_STATIC_NUM] = {NULL};
+ 
 int _mutex_initialize(mutex *m)
 {
     osMutexAttr_t attr;
@@ -445,10 +448,13 @@ int _mutex_initialize(mutex *m)
 
     mutex *slot = NULL;
     core_util_critical_section_enter();
-    for (int i = 0; i < OS_MUTEX_NUM; i++) {
+    for (int i = 0; i < OS_MUTEX_STATIC_NUM; i++) {
         if (_static_mutexes[i] == NULL) {
             _static_mutexes[i] = (mutex)-1; // dummy value to reserve slot
             slot = &_static_mutexes[i];
+            //Use the static attrs
+            attr.cb_size = sizeof(mbed_rtos_storage_mutex_t);
+            attr.cb_mem = &_static_mutexes_mem[i];
             break;
         }
     }
@@ -482,7 +488,7 @@ int _mutex_initialize(mutex *m)
 void _mutex_free(mutex *m) {
     mutex *slot = NULL;
     core_util_critical_section_enter();
-    for (int i = 0; i < OS_MUTEX_NUM; i++) {
+    for (int i = 0; i < OS_MUTEX_STATIC_NUM; i++) {
         if (_static_mutexes[i] == *m) {
             slot = &_static_mutexes[i];
             break;

rtos/TARGET_CORTEX/mbed_rtx_conf.h

@@ -45,12 +45,6 @@
 #error "OS Tickrate must be 1000 for system timing"
 #endif
 
-#if defined (__CC_ARM) || (defined (__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050))
-/* ARM toolchain uses up to 8 static mutexes, any further mutexes will be allocated on the heap. */
-#define OS_MUTEX_OBJ_MEM            1
-#define OS_MUTEX_NUM                8
-#endif
-
 #if !defined(OS_STACK_WATERMARK) && (defined(MBED_STACK_STATS_ENABLED) && MBED_STACK_STATS_ENABLED)
 #define OS_STACK_WATERMARK          1
 #endif