re PR c++/13684 (local static object variable constructed once but ctors and dtors called multiple times on same memory when called in multiple threads)

        PR c++/13684
        * cp/decl.c (expand_static_init): Use thread-safety API.
        (register_dtor_fn): Return the call, don't expand it.
        * cp/tree.c (add_stmt_to_compound): New fn.
        (stabilize_call): Use it.
        * gimplify.c (gimplify_cleanup_point_expr): Handle CLEANUP_EH_ONLY.
        (gimple_push_cleanup): Add eh_only parm.
        (gimplify_target_expr): Pass it.
        * c.opt (-fno-threadsafe-statics): New option.
        * c-opts.c (c_common_handle_option): Handle it.
        * c-common.h (flag_threadsafe_statics): Declare it.
        * c-common.c (flag_threadsafe_statics): Record it.
        * doc/invoke.texi: Document it.
        * tsystem.h (_GNU_SOURCE): Define.
        * gthr-posix.h (__gthread_recursive_mutex_t): New typedef.
        (__GTHREAD_RECURSIVE_MUTEX_INIT): New macro.
        (__GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION): New macro.
        (__gthread_recursive_mutex_init_function): New fn.
        (__gthread_recursive_mutex_lock): New fn.
        (__gthread_recursive_mutex_trylock): New fn.
        (__gthread_recursive_mutex_unlock): New fn.
        * gthr-solaris.h, gthr-single.h, gthr-dce.h: Likewise.
        * gthr-win32.h, gthr-vxworks.h: Likewise.
        * gthr.h: Document.

        * libsupc++/guard.cc (static_mutex): Internal class implementing a
        recursive mutex which controls initialization of local statics.
        (__gnu_cxx::recursive_init): New exception class.
        (__cxa_guard_acquire): Deal with locking and recursion detection.
        (acquire_1, __cxa_guard_abort, __cxa_guard_release): Likewise.

From-SVN: r86687

1 files changed, 113 insertions, 0 deletions

diff --git a/gcc/gthr-win32.h b/gcc/gthr-win32.h
index b761804..3e1aac7 100644
--- a/gcc/gthr-win32.h
+++ b/gcc/gthr-win32.h
@@ -343,9 +343,18 @@ typedef struct {
   void *sema;
 } __gthread_mutex_t;
 
+typedef struct {
+  long counter;
+  long depth;
+  DWORD owner;
+  void *sema;
+} __gthread_recursive_mutex_t;
+
 #define __GTHREAD_ONCE_INIT {0, -1}
 #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
 #define __GTHREAD_MUTEX_INIT_DEFAULT {-1, 0}
+#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
+#define __GTHREAD_RECURSIVE_MUTEX_INIT_DEFAULT {-1, 0}
 
 #if __MINGW32_MAJOR_VERSION >= 1 || \
   (__MINGW32_MAJOR_VERSION == 0 && __MINGW32_MINOR_VERSION > 2)
@@ -472,6 +481,33 @@ __gthread_mutex_unlock (__gthread_mutex_t *mutex)
     return 0;
 }
 
+static inline int
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
+{
+  if (__gthread_active_p ())
+    return __gthr_win32_recursive_mutex_lock (mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
+{
+  if (__gthread_active_p ())
+    return __gthr_win32_recursive_mutex_trylock (mutex);
+  else
+    return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
+{
+  if (__gthread_active_p ())
+    return __gthr_win32_recursive_mutex_unlock (mutex);
+  else
+    return 0;
+}
+
 #else /* ! __GTHREAD_HIDE_WIN32API */
 
 #include <windows.h>
@@ -610,6 +646,83 @@ __gthread_mutex_unlock (__gthread_mutex_t *mutex)
   return 0;
 }
 
+static inline void
+__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
+{
+  mutex->counter = -1;
+  mutex->depth = 0;
+  mutex->owner = 0;
+  mutex->sema = CreateSemaphore (NULL, 0, 65535, NULL);
+}
+
+static inline int
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
+{
+  if (__gthread_active_p ())
+    {
+      DWORD me = GetCurrentThreadId();
+      if (InterlockedIncrement (&mutex->counter) == 0)
+	{
+	  mutex->depth = 1;
+	  mutex->owner = me;
+	}
+      else if (mutex->owner == me)
+	{
+	  InterlockedDecrement (&mx->lock_idx);
+	  ++(mutex->depth);
+	}
+      else if (WaitForSingleObject (mutex->sema, INFINITE) == WAIT_OBJECT_0)
+	{
+	  mutex->depth = 1;
+	  mutex->owner = me;
+	}
+      else
+	{
+	  /* WaitForSingleObject returns WAIT_FAILED, and we can only do
+	     some best-effort cleanup here.  */
+	  InterlockedDecrement (&mutex->counter);
+	  return 1;
+	}
+    }
+  return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
+{
+  if (__gthread_active_p ())
+    {
+      DWORD me = GetCurrentThreadId();
+      if (__GTHR_W32_InterlockedCompareExchange (&mutex->counter, 0, -1) < 0)
+	{
+	  mutex->depth = 1;
+	  mutex->owner = me;
+	}
+      else if (mutex->owner == me)
+	++(mutex->depth);
+      else
+	return 1;
+    }
+  return 0;
+}
+
+static inline int
+__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
+{
+  if (__gthread_active_p ())
+    {
+      --(mutex->depth);
+      if (mutex->depth == 0)
+	{
+	  mutex->owner = 0;
+
+	  if (InterlockedDecrement (&mutex->counter) >= 0)
+	    return ReleaseSemaphore (mutex->sema, 1, NULL) ? 0 : 1;
+	}
+    }
+  return 0;
+}
+
 #endif /*  __GTHREAD_HIDE_WIN32API */
 
 #ifdef __cplusplus