Declare API function and print amount of memory obtained from OS

Public GC_get_obtained_from_os_bytes() is introduced.

* alloc.c [USE_MUNMAP] (GC_stopped_mark): Add assertion that
GC_heapsize is not less than GC_unmapped_bytes.
* alloc.c (GC_stopped_mark): Add assertion that GC_our_mem_bytes is
not less than GC_heapsize; print GC_our_mem_bytes-GC_heapsize value
(using GC_DBGLOG_PRINTF).
* alloc.c [USE_PROC_FOR_LIBRARIES] (GC_add_to_our_memory): Update
comment; increment GC_our_mem_bytes value (by bytes).
* include/private/gc_priv.h (GC_add_to_our_memory): Likewise.
* include/gc.h (GC_get_obtained_from_os_bytes): New API function
declaration.
* include/gc.h (GC_prof_stats_s.obtained_from_os_bytes): Declare new
field.
* include/private/gc_priv.h (_GC_arrays._our_mem_bytes): Likewise.
* misc.c (GC_get_obtained_from_os_bytes): Implement.
* misc.c [!GC_GET_HEAP_USAGE_NOT_NEEDED] (fill_prof_stats): Set
obtained_from_os_bytes field.
* tests/test.c (check_heap_stats): Print value returned by
GC_get_obtained_from_os_bytes().
* tests/test.c [USE_MUNMAP] (check_heap_stats): Print value returned
by GC_get_unmapped_bytes().

1 files changed, 8 insertions, 0 deletions

diff --git a/tests/test.c b/tests/test.c
index ab590fea..5e02b788 100644
--- a/tests/test.c
+++ b/tests/test.c
@@ -1830,6 +1830,14 @@ void check_heap_stats(void)
             (unsigned long)max_heap_sz);
         FAIL;
     }
+#   ifdef USE_MUNMAP
+      GC_printf("Obtained %lu bytes from OS (of which %lu bytes unmapped)\n",
+                (unsigned long)GC_get_obtained_from_os_bytes(),
+                (unsigned long)GC_get_unmapped_bytes());
+#   else
+      GC_printf("Obtained %lu bytes from OS\n",
+                (unsigned long)GC_get_obtained_from_os_bytes());
+#   endif
     GC_printf("Final number of reachable objects is %u\n", obj_count);
 
 #   ifndef GC_GET_HEAP_USAGE_NOT_NEEDED