Set name of GC marker threads

Issue #300 (bdwgc).

The threads are named as "GC-marker-<n>".

For now, the detection of pthread_setname_np availability and kind is
implemented in configure only.

On Darwin, the GC mprotect thread name is set too.

* configure.ac [$THREADS==posix] (HAVE_PTHREAD_SETNAME_NP_WITHOUT_TID,
HAVE_PTHREAD_SETNAME_NP_WITH_TID_AND_ARG,
HAVE_PTHREAD_SETNAME_NP_WITH_TID): Check for pthread_setname_np; set
the relevant HAVE_x macro.
* include/private/gc_priv.h [__CYGWIN__ && GC_THREADS && !_GNU_SOURCE]
(_GNU_SOURCE): Define.
* os_dep.c [MPROTECT_VDB && DARWIN
&& HAVE_PTHREAD_SETNAME_NP_WITHOUT_TID] (GC_mprotect_thread): Call
pthread_setname_np().
* pthread_support.c [PARALLEL_MARK] (set_marker_thread_name): Define.
* win32_threads.c [PARALLEL_MARK] (set_marker_thread_name): Likewise.
* pthread_support.c [PARALLEL_MARK] (GC_mark_thread): Call
set_marker_thread_name(id).
* win32_threads.c [PARALLEL_MARK] (GC_mark_thread): Likewise.

1 files changed, 3 insertions, 0 deletions

diff --git a/os_dep.c b/os_dep.c
index 22af1fb5..eb6b3326 100644
--- a/os_dep.c
+++ b/os_dep.c
@@ -4033,6 +4033,9 @@ STATIC void *GC_mprotect_thread(void *arg)
     msg.data[0] = 0;
 # endif
 
+# if defined(HAVE_PTHREAD_SETNAME_NP_WITHOUT_TID)
+    (void)pthread_setname_np("GC-mprotect");
+# endif
 # if defined(THREADS) && !defined(GC_NO_THREADS_DISCOVERY)
     GC_darwin_register_mach_handler_thread(mach_thread_self());
 # endif