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51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
/*
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* \brief Utility to execute a function repeatedly
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* \author Norman Feske
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* \author Stefan Kalkowski
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* \date 2015-04-29
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*/
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/*
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* Copyright (C) 2015-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__UTIL__RETRY_H_
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#define _INCLUDE__UTIL__RETRY_H_
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namespace Genode {
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template <typename EXC>
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auto retry(auto const &fn, auto const &,
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unsigned attempts = ~0U) -> decltype(fn());
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}
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/**
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* Repeatedly try to execute a function 'func'
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*
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* If the function 'func' throws an exception of type 'EXC', the 'handler'
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* is called and the function call is retried.
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*
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* \param EXC exception type to handle
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* \param fn functor to execute
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* \param exc_fn exception handler executed if 'fn' raised an exception
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* of type 'EXC'
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* \param attempts number of attempts to execute 'func' before giving up
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* and reflecting the exception 'EXC' to the caller. If not
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* specified, attempt infinitely.
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*/
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template <typename EXC>
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auto Genode::retry(auto const &fn, auto const &exc_fn,
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unsigned attempts) -> decltype(fn())
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{
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for (unsigned i = 0; attempts == ~0U || i < attempts; i++)
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try { return fn(); }
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catch (EXC) { exc_fn(); }
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throw EXC();
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}
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#endif /* _INCLUDE__UTIL__RETRY_H_ */
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