2009-03-23 Ian Lance Taylor <iant@google.com>

	* gold-threads.h (class Initialize_lock): Define.
	* gold-threads.cc (class Initialize_lock_once): Define.
	(initialize_lock_control): New static variable.
	(initialize_lock_pointer): New static variable.
	(initialize_lock_once): New static function.
	(Initialize_lock::Initialize_lock): Define.
	(Initialize_lock::initialize): Define.
	* target-select.h: Include "gold-threads.h".
	(class Target_selector): Add lock_ and initialize_lock_ fields.
	Don't define instantiate_target, just declare it.
	* target-select.cc (Target_selector::Target_selector): Initialize
	new fields.
	(Target_selector::instantiate_target): Define.
	* descriptors.h: Include "gold-threads.h".
	(class Descriptors): Add initialize_lock_ field.
	* descriptors.cc (Descriptors::Descriptors): Initialize new
	field.
	(Descriptors::open): Use initialize_lock_ field
	* errors.h (class Errors): Add initialize_lock_ field.
	* errors.cc (Errors::Errors): Initialize new field.
	(Errors::initialize_lock): Use initialize_lock_ field.
	* powerpc.cc (class Target_selector_powerpc): Remove
	instantiated_target_ field.  In do_recognize call
	instantiate_target rather than do_instantiate_target.  In
	do_instantiate_target just allocate a new target.
	* sparc.cc (class Target_selector_sparc): Likewise.

1 files changed, 4 insertions, 2 deletions

diff --git a/gold/descriptors.h b/gold/descriptors.h
index 44c2475..8e154a6 100644
--- a/gold/descriptors.h
+++ b/gold/descriptors.h
@@ -25,11 +25,11 @@
 
 #include <vector>
 
+#include "gold-threads.h"
+
 namespace gold
 {
 
-class Lock;
-
 // This class manages file descriptors for gold.
 
 class Descriptors
@@ -78,6 +78,8 @@ class Descriptors
 
   // We need to lock before accessing any fields.
   Lock* lock_;
+  // Used to initialize the lock_ field exactly once.
+  Initialize_lock initialize_lock_;
   // Information for descriptors.
   std::vector<Open_descriptor> open_descriptors_;
   // Top of stack.