[PATCH 2/5] score: Add _Heap_Size_with_overhead()

[Sebastian Huber]

---
 cpukit/score/include/rtems/score/heap.h       |   23 +++++++++++++++++++++++
 testsuites/libtests/malloctest/init.c         |   20 ++++++++++++++++++++
 testsuites/libtests/malloctest/malloctest.scn |    1 +
 3 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/cpukit/score/include/rtems/score/heap.h 
b/cpukit/score/include/rtems/score/heap.h
index 80a041c..53b569a 100644
--- a/cpukit/score/include/rtems/score/heap.h
+++ b/cpukit/score/include/rtems/score/heap.h
@@ -464,6 +464,29 @@ RTEMS_INLINE_ROUTINE uintptr_t _Heap_Area_overhead(
   return 2 * (page_size - 1) + HEAP_BLOCK_HEADER_SIZE;
 }
 
+/**
+ * @brief Returns the size with administration and alignment overhead for one
+ * allocation.
+ */
+RTEMS_INLINE_ROUTINE uintptr_t _Heap_Size_with_overhead(
+  uintptr_t page_size,
+  uintptr_t size,
+  uintptr_t alignment
+)
+{
+  if ( page_size != 0 ) {
+    page_size = _Heap_Align_up( page_size, CPU_ALIGNMENT );
+  } else {
+    page_size = CPU_ALIGNMENT;
+  }
+
+  if ( page_size < alignment ) {
+    page_size = alignment;
+  }
+
+  return HEAP_BLOCK_HEADER_SIZE + page_size - 1 + size;
+}
+
 /** @} */
 
 #ifdef __cplusplus
diff --git a/testsuites/libtests/malloctest/init.c 
b/testsuites/libtests/malloctest/init.c
index ace454f..0cdbe84 100644
--- a/testsuites/libtests/malloctest/init.c
+++ b/testsuites/libtests/malloctest/init.c
@@ -1157,6 +1157,25 @@ static void 
test_rtems_heap_allocate_aligned_with_boundary(void)
   rtems_test_assert( p == NULL );
 }
 
+static void test_heap_size_with_overhead(void)
+{
+  uintptr_t s;
+
+  puts( "_Heap_Size_with_overhead" );
+
+  s = _Heap_Size_with_overhead(0, 0, 0);
+  rtems_test_assert(s == HEAP_BLOCK_HEADER_SIZE + CPU_ALIGNMENT - 1);
+
+  s = _Heap_Size_with_overhead(CPU_ALIGNMENT, 0, 0);
+  rtems_test_assert(s == HEAP_BLOCK_HEADER_SIZE + CPU_ALIGNMENT - 1);
+
+  s = _Heap_Size_with_overhead(CPU_ALIGNMENT, 0, 2 * CPU_ALIGNMENT);
+  rtems_test_assert(s == HEAP_BLOCK_HEADER_SIZE + 2 * CPU_ALIGNMENT - 1);
+
+  s = _Heap_Size_with_overhead(CPU_ALIGNMENT, 123, 0);
+  rtems_test_assert(s == HEAP_BLOCK_HEADER_SIZE + CPU_ALIGNMENT - 1 + 123);
+}
+
 /*
  *  A simple test of posix_memalign
  */
@@ -1268,6 +1287,7 @@ rtems_task Init(
   test_heap_extend_allocation_order_with_empty_heap();
   test_heap_no_extend();
   test_heap_info();
+  test_heap_size_with_overhead();
   test_protected_heap_info();
   test_rtems_heap_allocate_aligned_with_boundary();
   test_greedy_allocate();
diff --git a/testsuites/libtests/malloctest/malloctest.scn 
b/testsuites/libtests/malloctest/malloctest.scn
index dcb529d..ec684c6 100644
--- a/testsuites/libtests/malloctest/malloctest.scn
+++ b/testsuites/libtests/malloctest/malloctest.scn
@@ -59,6 +59,7 @@ malloc_info - called with NULL
 
 malloc_info - check free space drops after malloc
 malloc_info - verify free space returns to previous value
+_Heap_Size_with_overhead
 _Protected_heap_Get_information - NULL heap
 _Protected_heap_Get_information - NULL info
 posix_memalign - NULL return pointer -- EINVAL
-- 
1.7.7

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