diff options
Diffstat (limited to 'include/systools/win32/retry_if_failed.hxx')
-rw-r--r-- | include/systools/win32/retry_if_failed.hxx | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/include/systools/win32/retry_if_failed.hxx b/include/systools/win32/retry_if_failed.hxx new file mode 100644 index 0000000000..1372843ab8 --- /dev/null +++ b/include/systools/win32/retry_if_failed.hxx @@ -0,0 +1,38 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +#pragma once + +#include <type_traits> +#include <systools/win32/uwinapi.h> + +#pragma comment(lib, "Kernel32.lib") // for Sleep + +namespace sal::systools +{ +// Some system calls (e.g., clipboard access functions) may fail first time, because the resource +// may only be accessed by one process at a time. This function allows to retry failed call up to +// specified number of times with a specified timeout (in ms), until the call succeeds or the limit +// of attempts is exceeded. +// Usage: +// HRESULT hr = sal::systools::RetryIfFailed(10, 100, []{ return OleFlushClipboard(); }); +template <typename Func> +std::enable_if_t<std::is_same_v<std::invoke_result_t<Func>, HRESULT>, HRESULT> +RetryIfFailed(unsigned times, unsigned msTimeout, Func func) +{ + for (unsigned i = 0;; ++i) + { + if (HRESULT hr = func(); SUCCEEDED(hr) || i >= times) + return hr; + Sleep(msTimeout); + } +} +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */ |