[PATCH] Pthreads cleanup push/pop changes

[Sebastian Huber]

Implementation according to POSIX:

http://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_cleanup_push.html

This change is not conditional to RTEMS since I don't think the previous
approach is useful at all.  To provide binary compatibility systems can
still provide the previous pthread_cleanup_push() and pthread_cleanup_pop()
functions.

newlib/ChangeLog
2013-07-08  Sebastian Huber <sebastian.huber at embedded-brains.de>

	* libc/include/pthread.h (pthread_cleanup_push): Delete prototype
	and add macro of the same name.
	(pthread_cleanup_pop): Likewise.
	(_pthread_cleanup_context): Define.
	(_pthread_cleanup_push): Likewise.
	(_pthread_cleanup_pop): Likewise.
	(pthread_cleanup_push_defer_np): Define if _GNU_SOURCE is defined.
	(pthread_cleanup_pop_restore_np): Likewise.
	(_pthread_cleanup_push_defer): Likewise.
	(_pthread_cleanup_pop_restore): Likewise.
---
 newlib/libc/include/pthread.h |   47 ++++++++++++++++++++++++++++++++++++++--
 1 files changed, 44 insertions(+), 3 deletions(-)

diff --git a/newlib/libc/include/pthread.h b/newlib/libc/include/pthread.h
index ff7f354..9641114 100644
--- a/newlib/libc/include/pthread.h
+++ b/newlib/libc/include/pthread.h
@@ -33,6 +33,13 @@ extern "C" {
 #include <time.h>
 #include <sys/sched.h>
 
+struct _pthread_cleanup_context {
+  void (*_routine)(void *);
+  void *_arg;
+  int _canceltype;
+  struct _pthread_cleanup_context *_previous;
+};
+
 /* Register Fork Handlers */
 int	_EXFUN(pthread_atfork,(void (*prepare)(void), void (*parent)(void),
                    void (*child)(void)));
@@ -280,9 +287,43 @@ void 	_EXFUN(pthread_testcancel, (void));
 
 /* Establishing Cancellation Handlers, P1003.1c/Draft 10, p. 184 */
 
-void 	_EXFUN(pthread_cleanup_push,
-	(void (*__routine)( void * ), void *__arg));
-void 	_EXFUN(pthread_cleanup_pop, (int __execute));
+void	_EXFUN(_pthread_cleanup_push,
+	(struct _pthread_cleanup_context *_context,
+	void (*_routine)(void *), void *_arg));
+
+void	_EXFUN(_pthread_cleanup_pop,
+	(struct _pthread_cleanup_context *_context,
+	int _execute));
+
+/* It is intentional to open and close the scope in two different macros */
+#define pthread_cleanup_push(_routine, _arg) \
+  do { \
+    struct _pthread_cleanup_context _pthread_clup_ctx; \
+    _pthread_cleanup_push(&_pthread_clup_ctx, (_routine), (_arg))
+
+#define pthread_cleanup_pop(_execute) \
+    _pthread_cleanup_pop(&_pthread_clup_ctx, (_execute)); \
+  } while (0)
+
+#if defined(_GNU_SOURCE)
+void	_EXFUN(_pthread_cleanup_push_defer,
+	(struct _pthread_cleanup_context *_context,
+	void (*_routine)(void *), void *_arg));
+
+void	_EXFUN(_pthread_cleanup_pop_restore,
+	(struct _pthread_cleanup_context *_context,
+	int _execute));
+
+/* It is intentional to open and close the scope in two different macros */
+#define pthread_cleanup_push_defer_np(_routine, _arg) \
+  do { \
+    struct _pthread_cleanup_context _pthread_clup_ctx; \
+    _pthread_cleanup_push_defer(&_pthread_clup_ctx, (_routine), (_arg))
+
+#define pthread_cleanup_pop_restore_np(_execute) \
+    _pthread_cleanup_pop_restore(&_pthread_clup_ctx, (_execute)); \
+  } while (0)
+#endif /* defined(_GNU_SOURCE) */
 
 #if defined(_POSIX_THREAD_CPUTIME)
  
-- 
1.7.7