Parallel-marker code refactoring (replace GC_markers with GC_markers_m1)

* include/private/gc_priv.h (GC_markers): Replace with GC_markers_m1
(which is GC_markers minus one); update the comment.
* mark.c (GC_markers): Likewise.
* mark.c (GC_help_marker): Replace GC_markers with GC_markers_m1.
* pthread_support.c (GC_is_mach_marker, start_mark_threads,
GC_segment_is_thread_stack, GC_fork_child_proc, GC_thr_init): Likewise.
* win32_threads.c (GC_get_next_stack, start_mark_threads,
GC_wait_marker, GC_notify_all_marker, GC_thr_init): Likewise.

1 files changed, 2 insertions, 2 deletions

diff --git a/mark.c b/mark.c
index f4197364..c8a63ec7 100644
--- a/mark.c
+++ b/mark.c
@@ -1017,7 +1017,7 @@ STATIC void GC_do_local_mark(mse *local_mark_stack, mse *local_top)
 
 #define ENTRIES_TO_GET 5
 
-GC_INNER int GC_markers = 2;    /* Normally changed by thread-library-  */
+GC_INNER int GC_markers_m1 = 1; /* Normally changed by thread-library-  */
                                 /* -specific code.                      */
 
 /* Mark using the local mark stack until the global mark stack is empty */
@@ -1179,7 +1179,7 @@ GC_INNER void GC_help_marker(word my_mark_no)
       GC_wait_marker();
     }
     my_id = GC_helper_count;
-    if (GC_mark_no != my_mark_no || my_id >= (unsigned)GC_markers) {
+    if (GC_mark_no != my_mark_no || my_id > (unsigned)GC_markers_m1) {
       /* Second test is useful only if original threads can also        */
       /* act as helpers.  Under Linux they can't.                       */
       GC_release_mark_lock();