adaint.c (ProcListEvt): Set to NULL.

2015-01-06  Pascal Obry  <obry@adacore.com>

	* adaint.c (ProcListEvt): Set to NULL.
	* rtinit.c: New file.
	(__gnat_rt_init_count): New reference counter set to 0.
	(__gnat_runtime_initialize): Move code here from __gnat_initialize when
	this code is actually needed for the runtime initialization. This
	routine returns immediately if the initialization has already been done.
	* final.c: Revert previous change.
	* rtfinal.c: New file.
	(__gnat_runtime_finalize)[Win32]: Add finalization of the critical
	section and event. The default version of this routine is empty (except
	for the reference counting code). This routine returns immediately if
	some others libraries are referencing the runtime.
	* bindgen.adb (Gen_Adainit): Generate call to Runtime_Initialize
	remove circuitry to initialize the signal handler as this is
	now done by the runtime initialization routine.
	(Gen_Adafinal): Generate call to Runtime_Finalize.
	* gnat_ugn.texi: Update documentation about concurrency and
	initialization/finalization of the run-time.
	* gcc-interface/Makefile.in, gcc-interface/Make-lang.in: Add
	references to rtfinal.o and rtinit.o

From-SVN: r219238

1 files changed, 89 insertions, 0 deletions

diff --git a/gcc/ada/rtfinal.c b/gcc/ada/rtfinal.c
new file mode 100644
index 0000000..0500964
--- /dev/null
+++ b/gcc/ada/rtfinal.c
@@ -0,0 +1,89 @@
+/****************************************************************************
+ *                                                                          *
+ *                         GNAT COMPILER COMPONENTS                         *
+ *                                                                          *
+ *                              R T F I N A L                               *
+ *                                                                          *
+ *                          C Implementation File                           *
+ *                                                                          *
+ *             Copyright (C) 2014-2015, Free Software Foundation, Inc.      *
+ *                                                                          *
+ * GNAT is free software;  you can  redistribute it  and/or modify it under *
+ * terms of the  GNU General Public License as published  by the Free Soft- *
+ * ware  Foundation;  either version 3,  or (at your option) any later ver- *
+ * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
+ * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
+ * or FITNESS FOR A PARTICULAR PURPOSE.                                     *
+ *                                                                          *
+ * As a special exception under Section 7 of GPL version 3, you are granted *
+ * additional permissions described in the GCC Runtime Library Exception,   *
+ * version 3.1, as published by the Free Software Foundation.               *
+ *                                                                          *
+ * You should have received a copy of the GNU General Public License and    *
+ * a copy of the GCC Runtime Library Exception along with this program;     *
+ * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    *
+ * <http://www.gnu.org/licenses/>.                                          *
+ *                                                                          *
+ * GNAT was originally developed  by the GNAT team at  New York University. *
+ * Extensive contributions were provided by Ada Core Technologies Inc.      *
+ *                                                                          *
+ ****************************************************************************/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void __gnat_runtime_finalize (void);
+
+/* This routine is called at the extreme end of execution of an Ada program
+   (the call is generated by the binder). The standard routine does nothing
+   at all, the intention is that this be replaced by system specific code
+   where finalization is required.
+
+   Note that __gnat_runtime_initialize() is called in adafinal()   */
+
+extern int __gnat_rt_init_count;
+/*  see initialize.c  */
+
+#if defined (__MINGW32__)
+#include "mingw32.h"
+#include <windows.h>
+
+extern CRITICAL_SECTION ProcListCS;
+extern HANDLE ProcListEvt;
+
+void
+__gnat_runtime_finalize (void)
+{
+  /*  decrement the reference counter */
+
+  __gnat_rt_init_count--;
+
+  /*  if still some referenced return now */
+  if (__gnat_rt_init_count > 0)
+    return;
+
+  /* delete critical section and event handle used for the
+     processes chain list */
+  DeleteCriticalSection(&ProcListCS);
+  CloseHandle (ProcListEvt);
+}
+
+#else
+
+void
+__gnat_runtime_finalize (void)
+{
+  /*  decrement the reference counter */
+
+  __gnat_rt_init_count--;
+
+  /*  if still some referenced return now */
+  if (__gnat_rt_init_count > 0)
+    return;
+}
+#endif
+
+#ifdef __cplusplus
+}
+#endif