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base: move retry template function to util header

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Ref #1443
This commit is contained in:
Stefan Kalkowski
2015-05-19 13:57:25 +02:00
committed by Christian Helmuth
parent 64bfe233d7
commit 217f62b89d
2 changed files with 51 additions and 25 deletions
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26
repos/base/src/base/env/platform_env_common.h vendored
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@ -18,6 +18,7 @@
#include <base/env.h>
#include <util/arg_string.h>
#include <util/retry.h>
#include <parent/client.h>
#include <ram_session/client.h>
#include <rm_session/client.h>
@ -35,31 +36,6 @@ namespace Genode {
}
/**
* Repeatedly try to execute a function 'func'
*
* If the function 'func' throws an exception of type 'EXC', the 'handler'
* is called and the function call is retried.
*
* \param EXC exception type to handle
* \param func functor to execute
* \param handler exception handler executed if 'func' raised an exception
* of type 'EXC'
* \param attempts number of attempts to execute 'func' before giving up
* and reflecting the exception 'EXC' to the caller. If not
* specified, attempt infinitely.
*/
template <typename EXC, typename FUNC, typename HANDLER>
auto retry(FUNC func, HANDLER handler, unsigned attempts = ~0U) -> decltype(func())
{
for (unsigned i = 0; attempts == ~0U || i < attempts; i++)
try { return func(); }
catch (EXC) { handler(); }
throw EXC();
}
/**
* Client object for a session that may get its session quota upgraded
*/