1 files changed, 3 insertions, 18 deletions
diff --git a/os/src/sbrk.c b/os/src/sbrk.c
index 53efe1e..fcb6b7a 100644
--- a/os/src/sbrk.c
+++ b/os/src/sbrk.c
@@ -9,27 +9,15 @@
 
 #include "osdebug.h"
 
-// Mostly stolen from mbed-freertos
-
 extern uintptr_t __heap_start;
 extern uintptr_t __stack_start;
 
-/* Low-level bulk RAM allocator -- used by Newlib's Malloc */
-static void *heap_end = (void *) &__heap_start;
-
-static xSemaphoreHandle sbrk_sem = NULL;
-
-__attribute__((constructor)) static void sbrk_init() {
-    sbrk_sem = xSemaphoreCreateMutex();
-}
+static void * heap_end = (void *) &__heap_start;
 
-void *_sbrk_r(struct _reent *ptr, ptrdiff_t incr) {
+void * sbrk(ptrdiff_t incr) {
     void *prev_heap_end, *next_heap_end, *ret;
     void *stack_min = (void *) &__stack_start;
     
-    if (sbrk_sem)
-        xSemaphoreTake(sbrk_sem, portMAX_DELAY);
-
     prev_heap_end = heap_end;
 
     /* Align to always be on 8-byte boundaries */
@@ -37,15 +25,12 @@ void *_sbrk_r(struct _reent *ptr, ptrdiff_t incr) {
 
     /* Check if this allocation would exceed the end of the ram - would probably get into the stack first however */
     if (next_heap_end > stack_min) {
-        ptr->_errno = ENOMEM;
+        _impure_ptr->_errno = ENOMEM;
         ret = NULL;
     } else {
         heap_end = next_heap_end;
         ret = (void *)prev_heap_end;
     }
 
-    if (sbrk_sem)
-        xSemaphoreGive(sbrk_sem);
-
     return ret;
 }