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-/*****************************************************************************
-
-Copyright (c) 2014, Oracle and/or its affiliates. All Rights Reserved.
-
-This program is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free Software
-Foundation; version 2 of the License.
-
-This program is distributed in the hope that it will be useful, but WITHOUT
-ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License along with
-this program; if not, write to the Free Software Foundation, Inc.,
-51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
-
-*****************************************************************************/
-
-/**************************************************//**
-@file include/os0once.h
-A class that aids executing a given function exactly once in a multi-threaded
-environment.
-
-Created Feb 20, 2014 Vasil Dimov
-*******************************************************/
-
-#ifndef os0once_h
-#define os0once_h
-
-#include "univ.i"
-
-#include "os0sync.h"
-#include "ut0ut.h"
-
-/** Execute a given function exactly once in a multi-threaded environment
-or wait for the function to be executed by another thread.
-
-Example usage:
-First the user must create a control variable of type os_once::state_t and
-assign it os_once::NEVER_DONE.
-Then the user must pass this variable, together with a function to be
-executed to os_once::do_or_wait_for_done().
-
-Multiple threads can call os_once::do_or_wait_for_done() simultaneously with
-the same (os_once::state_t) control variable. The provided function will be
-called exactly once and when os_once::do_or_wait_for_done() returns then this
-function has completed execution, by this or another thread. In other words
-os_once::do_or_wait_for_done() will either execute the provided function or
-will wait for its execution to complete if it is already called by another
-thread or will do nothing if the function has already completed its execution
-earlier.
-
-This mimics pthread_once(3), but unfortunatelly pthread_once(3) does not
-support passing arguments to the init_routine() function. We should use
-std::call_once() when we start compiling with C++11 enabled. */
-class os_once {
-public:
-	/** Control variables' state type */
-	typedef ib_uint32_t	state_t;
-
-	/** Not yet executed. */
-	static const state_t	NEVER_DONE = 0;
-
-	/** Currently being executed by this or another thread. */
-	static const state_t	IN_PROGRESS = 1;
-
-	/** Finished execution. */
-	static const state_t	DONE = 2;
-
-#ifdef HAVE_ATOMIC_BUILTINS
-	/** Call a given function or wait its execution to complete if it is
-	already called by another thread.
-	@param[in,out]	state		control variable
-	@param[in]	do_func		function to call
-	@param[in,out]	do_func_arg	an argument to pass to do_func(). */
-	static
-	void
-	do_or_wait_for_done(
-		volatile state_t*	state,
-		void			(*do_func)(void*),
-		void*			do_func_arg)
-	{
-		/* Avoid calling os_compare_and_swap_uint32() in the most
-		common case. */
-		if (*state == DONE) {
-			return;
-		}
-
-		if (os_compare_and_swap_uint32(state,
-					       NEVER_DONE, IN_PROGRESS)) {
-			/* We are the first. Call the function. */
-
-			do_func(do_func_arg);
-
-			const bool	swapped = os_compare_and_swap_uint32(
-				state, IN_PROGRESS, DONE);
-
-			ut_a(swapped);
-		} else {
-			/* The state is not NEVER_DONE, so either it is
-			IN_PROGRESS (somebody is calling the function right
-			now or DONE (it has already been called and completed).
-			Wait for it to become DONE. */
-			for (;;) {
-				const state_t	s = *state;
-
-				switch (s) {
-				case DONE:
-					return;
-				case IN_PROGRESS:
-					break;
-				case NEVER_DONE:
-					/* fall through */
-				default:
-					ut_error;
-				}
-
-				UT_RELAX_CPU();
-			}
-		}
-	}
-#endif /* HAVE_ATOMIC_BUILTINS */
-};
-
-#endif /* os0once_h */