add some debug msgs; clean

1 files changed, 35 insertions, 8 deletions

diff --git a/lib/libpthread/uthread/uthread_autoinit.c b/lib/libpthread/uthread/uthread_autoinit.c
index 197b7fb83c6..5ac4592e61c 100644
--- a/lib/libpthread/uthread/uthread_autoinit.c
+++ b/lib/libpthread/uthread/uthread_autoinit.c
@@ -1,52 +1,79 @@
+/*
+ * David Leonard, 1998. Public Domain. <david.leonard@csee.uq.edu.au>
+ *
+ * $OpenBSD: uthread_autoinit.c,v 1.4 1999/01/10 23:07:59 d Exp $
+ */
 
 #include <stdio.h>
 #include <pthread.h>
 #include "pthread_private.h"
 
+__BEGIN_DECLS
 extern void _thread_init __P((void));
+__END_DECLS
+
+#ifdef DEBUG
+#define init_debug(m)	stderr_debug(m)
+#else
+#define init_debug(m)	/* nothing */
+#endif
 
-#ifdef __cplusplus
 /*
- * Use C++ static initialiser
+ * Use C++'s static instance constructor to initialise threads.
  */
+#ifdef __cplusplus
 class Init {
 public:
-	Init() { _thread_init(); }
+	Init() { 
+		init_debug("init: C++\n");
+		_thread_init();
+	}
 };
 Init _thread_initialiser;
 #endif /* C++ */
 
 /*
- * a.out ld.so initialisation
+ * The a.out ld.so dynamic linker calls the function
+ * at symbol ".init" if it exists, just after linkage.
  */
 extern void _thread_dot_init __P((void)) asm(".init");
 void 
 _thread_dot_init()
 { 
+	init_debug("init: a.out .init\n");
 	_thread_init();
 }
 
-#ifdef mips
 /*
- * elf ld.so initialisation
+ * The GNU ELF loader will place a function called _init
+ * found in the .dynamic section into the _INIT field. This then gets
+ * automatically run by GNU ELF's ld.so.
  */
+#ifdef mips
 extern int _init() __attribute__((constructor,section (".dynamic")));
 int 
 _init()
 { 
+	init_debug("init: elf _init\n");
 	_thread_init();
 	return 0; 
 }
 #endif /* mips */
 
-#ifdef _GNUC_
 /*
- * GNU CTOR_LIST constructor
+ * A GNU C installation may know how to automatically run
+ * constructors for other architectures. (It doesn't matter if 
+ * we initialise multiple times.)  This construct places
+ * the function in the __CTOR_LIST__ entry in the object, and later
+ * the collect2 stage of linkage will inform __main (from libgcc.a)
+ * to call it.
  */
+#ifdef _GNUC_
 void _thread_init_constructor __P((void)) __attribute__((constructor));
 void
 _thread_init_constructor()
 {
+	init_debug("init: GNU constructor");
 	_thread_init();
 }
 #endif /* GNU C */