From 1f5ff38778862dfbf8b878f9c1dbc89b6764ee65 Mon Sep 17 00:00:00 2001
From: Christopher Faylor <me@cgf.cx>
Date: Tue, 9 Jul 2002 04:37:13 +0000
Subject: * debug.cc: Avoid explicit zeroing of globals. (lock_debug): Make
 locker a static member.  Avoid unlocking when already unlocked (from Conrad
 Scott). (debug_init): Initialize lock_debug::locker here. * fork.cc
 (fork_child): Fix up fdtab earlier to avoid some (but not all) confusion with
 close-on-exec craziness.

---
 winsup/cygwin/debug.cc | 35 +++++++++++++++++++++++++++--------
 1 file changed, 27 insertions(+), 8 deletions(-)

(limited to 'winsup/cygwin/debug.cc')

diff --git a/winsup/cygwin/debug.cc b/winsup/cygwin/debug.cc
index a530c5c34..dc786ff69 100644
--- a/winsup/cygwin/debug.cc
+++ b/winsup/cygwin/debug.cc
@@ -176,27 +176,45 @@ typedef struct _h
     struct _h *next;
   } handle_list;
 
-static NO_COPY handle_list starth = {0, NULL, NULL, NULL, 0, 0, NULL};
-static NO_COPY handle_list *endh = NULL;
+static NO_COPY handle_list starth;
+static NO_COPY handle_list *endh;
 
-static handle_list NO_COPY freeh[1000] = {{0, NULL, NULL, NULL, 0, 0, NULL}};
+static NO_COPY handle_list freeh[1000];
 #define NFREEH (sizeof (freeh) / sizeof (freeh[0]))
 
-static muto NO_COPY *debug_lock = NULL;
+void debug_init ();
 
-struct lock_debug
+class lock_debug
 {
-  lock_debug () {if (debug_lock) debug_lock->acquire (INFINITE);}
-  void unlock () {if (debug_lock) debug_lock->release ();}
+  static muto *locker;
+  bool acquired;
+ public:
+  lock_debug () : acquired (0)
+  {
+    if (locker)
+      acquired = !!locker->acquire (INFINITE);
+  }
+  void unlock ()
+  {
+    if (locker && acquired)
+      {
+	locker->release ();
+	acquired = false;
+      }
+  }
   ~lock_debug () {unlock ();}
+  friend void debug_init ();
 };
 
+muto NO_COPY *lock_debug::locker = NULL;
+
 static bool __stdcall mark_closed (const char *, int, HANDLE, const char *, BOOL);
 
 void
 debug_init ()
 {
-  new_muto (debug_lock);
+  muto *debug_lock_muto;
+  lock_debug::locker = new_muto (debug_lock_muto);
 }
 
 /* Find a registered handle in the linked list of handles. */
@@ -296,6 +314,7 @@ delete_handle (handle_list *hl)
 void
 debug_fixup_after_fork ()
 {
+  /* No lock needed at this point */
   handle_list *hl;
   for (hl = &starth; hl->next != NULL; hl = hl->next)
     if (hl->next->clexec_pid)
-- 
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