Make thread names useful in a debugger

Associate the name with the system thread, so that debuggers
can see it. This is currently only implemented for Linux, using
prctl.

https://bugzilla.gnome.org/show_bug.cgi?id=660635

configure.ac

@@ -907,6 +907,7 @@ AC_CHECK_HEADERS([sys/vfs.h sys/mount.h sys/vmount.h sys/statfs.h sys/statvfs.h]
 AC_CHECK_HEADERS([mntent.h sys/mnttab.h sys/vfstab.h sys/mntctl.h sys/sysctl.h fstab.h])
 AC_CHECK_HEADERS([sys/uio.h sys/mkdev.h])
 AC_CHECK_HEADERS([linux/magic.h])
+AC_CHECK_HEADERS([sys/prctl.h])
 
 # check for structure fields
 AC_CHECK_MEMBERS([struct stat.st_mtimensec, struct stat.st_mtim.tv_nsec, struct stat.st_atimensec, struct stat.st_atim.tv_nsec, struct stat.st_ctimensec, struct stat.st_ctim.tv_nsec])

glib/gthread-posix.c

@@ -63,7 +63,9 @@
 #ifdef HAVE_SCHED_H
 #include <sched.h>
 #endif
-
+#ifdef HAVE_SYS_PRCTL_H
+#include <sys/prctl.h>
+#endif
 
 static void
 g_thread_abort (gint         status,
@@ -1047,5 +1049,13 @@ g_system_thread_equal (gpointer thread1,
   return (pthread_equal (*(pthread_t*)thread1, *(pthread_t*)thread2) != 0);
 }
 
+void
+g_system_thread_set_name (const gchar *name)
+{
+#ifdef HAVE_SYS_PRCTL_H
+  prctl (PR_SET_NAME, name, 0, 0, 0, 0);
+#endif
+}
+
 /* {{{1 Epilogue */
 /* vim:set foldmethod=marker: */

glib/gthread-win32.c

@@ -621,6 +621,12 @@ g_system_thread_equal (gpointer thread1,
    return ((GSystemThread*)thread1)->dummy_pointer == ((GSystemThread*)thread2)->dummy_pointer;
 }
 
+void
+g_system_thread_set_name (const gchar *name)
+{
+  /* FIXME: implement */
+}
+
 /* {{{1 SRWLock and CONDITION_VARIABLE emulation (for Windows XP) */
 
 static CRITICAL_SECTION g_thread_xp_lock;

glib/gthread.c

@@ -1131,6 +1131,9 @@ g_thread_create_proxy (gpointer data)
 
   g_assert (data);
 
+  if (thread->name)
+    g_system_thread_set_name (thread->name);
+
   /* This has to happen before G_LOCK, as that might call g_thread_self */
   g_private_set (&g_thread_specific_private, data);
 

glib/gthreadprivate.h

@@ -46,6 +46,7 @@ G_GNUC_INTERNAL gboolean g_system_thread_equal (gpointer thread1,
                                                 gpointer thread2);
 
 G_GNUC_INTERNAL void     g_system_thread_exit  (void);
+G_GNUC_INTERNAL void     g_system_thread_set_name (const gchar *name);
 
 G_GNUC_INTERNAL GSystemThread zero_thread;
 G_GNUC_INTERNAL GMutex g_once_mutex;