pst_allocator refactoring, use mutex to access fields

framework/allocator.h

@@ -10,6 +10,7 @@
 
 #include <stdint.h>
 #include <assert.h>
+#include <pthread.h>
 
 // concatenation
 #define CAT(a, ...) CAT2(a, __VA_ARGS__)
@@ -27,26 +28,24 @@
 #define pst_fini(TYPE, NAME) \
     CAT2(TYPE, _fini) (NAME);
 
-typedef struct __pst_allocator pst_allocator;
-
-typedef void* (*pst_alloc_def)(pst_allocator* alloc, uint32_t size);
-typedef void (*pst_free_def)(pst_allocator* alloc, void* buff);
-typedef void* (*pst_realloc_def)(pst_allocator* alloc, void* buff, uint32_t new_size);
-
 typedef enum {
     ALLOC_NONE = 0,     // not initialized
     ALLOC_HEAP = 1,     // use libc memory allocator
     ALLOC_CUSTOM = 2    // use custom allocator in predefined range of memory
 } pst_alloc_type;
 
-typedef struct __pst_allocator {
+typedef struct pst_allocator {
+    // methods
+    void* (*alloc)(pst_allocator* alloc, uint32_t size);
+    void (*free)(pst_allocator* alloc, void* buff);
+    void* (*realloc)(pst_allocator* alloc, void* buff, uint32_t new_size);
+
+    // fields
     int             type;
     void*           base;
     uint32_t        size;
-    // routines
-    pst_alloc_def   alloc;
-    pst_free_def    free;
-    pst_realloc_def realloc;
+    pthread_mutex_t lock;
+
 } pst_allocator;
 
 void pst_alloc_init(pst_allocator* alloc);