pst_allocator refactoring, use mutex to access fields

framework/allocator.cpp

@@ -14,23 +14,29 @@
 
 void heap_free(pst_allocator* alloc, void* buff)
 {
+    pthread_mutex_lock(&alloc->lock);
     alloc->size -= malloc_usable_size(buff);
+    pthread_mutex_unlock(&alloc->lock);
     free(buff);
 }
 
 void* heap_alloc(pst_allocator* alloc, uint32_t size)
 {
     void* buff = malloc(size);
+    pthread_mutex_lock(&alloc->lock);
     alloc->size += malloc_usable_size(buff);
+    pthread_mutex_unlock(&alloc->lock);
 
     return buff;
 }
 
 void* heap_realloc(pst_allocator* alloc, void* buff, uint32_t new_size)
 {
+    pthread_mutex_lock(&alloc->lock);
     alloc->size -= malloc_usable_size(buff);
     void* new_buff = realloc(buff, new_size);
     alloc->size += malloc_usable_size(new_buff);
+    pthread_mutex_unlock(&alloc->lock);
 
     return new_buff;
 }
@@ -45,6 +51,8 @@ void pst_alloc_init(pst_allocator* alloc)
     alloc->free = heap_free;
     alloc->realloc = heap_realloc;
 
+    pthread_mutex_init(&alloc->lock, NULL);
+
     return;
 }
 
@@ -62,4 +70,6 @@ void pst_alloc_fini(pst_allocator* alloc)
         alloc->base = NULL;
         alloc->size = 0;
     }
+
+    pthread_mutex_destroy(&alloc->lock);
 }