158 lines
3.6 KiB
C++
158 lines
3.6 KiB
C++
/*
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* \brief Platform-independent part of server-side RPC framework
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* \author Norman Feske
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* \date 2006-05-12
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*/
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/*
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* Copyright (C) 2006-2013 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 General Public License version 2.
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*/
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#include <base/rpc_server.h>
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#include <base/rpc_client.h>
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#include <base/blocking.h>
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#include <base/env.h>
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using namespace Genode;
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void Rpc_entrypoint::_dissolve(Rpc_object_base *obj)
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{
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/* make sure nobody is able to find this object */
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remove_locked(obj);
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/*
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* The activation may execute a blocking operation in a dispatch function.
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* Before resolving the corresponding object, we need to ensure that it is
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* no longer used. Therefore, we to need cancel an eventually blocking
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* operation and let the activation leave the context of the object.
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*/
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_leave_server_object(obj);
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/* wait until nobody is inside dispatch */
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obj->acquire();
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_cap_session->free(obj->cap());
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/* now the object may be safely destructed */
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}
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void Rpc_entrypoint::_leave_server_object(Rpc_object_base *obj)
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{
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Lock::Guard lock_guard(_curr_obj_lock);
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if (obj == _curr_obj)
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cancel_blocking();
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}
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void Rpc_entrypoint::_block_until_cap_valid()
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{
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_cap_valid.lock();
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}
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Untyped_capability Rpc_entrypoint::reply_dst()
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{
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return _ipc_server ? _ipc_server->dst() : Untyped_capability();
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}
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void Rpc_entrypoint::omit_reply()
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{
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/* set current destination to an invalid capability */
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if (_ipc_server) _ipc_server->dst(Untyped_capability());
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}
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void Rpc_entrypoint::explicit_reply(Untyped_capability reply_cap, int return_value)
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{
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if (!_ipc_server) return;
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/* backup reply capability of current request */
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Untyped_capability last_reply_cap = _ipc_server->dst();
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/* direct ipc server to the specified reply destination */
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_ipc_server->ret(return_value);
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_ipc_server->dst(reply_cap);
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*_ipc_server << IPC_REPLY;
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/* restore reply capability of the original request */
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_ipc_server->dst(last_reply_cap);
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}
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void Rpc_entrypoint::activate()
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{
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_delay_start.unlock();
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}
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bool Rpc_entrypoint::is_myself() const
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{
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return (Thread_base::myself() == this);
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}
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Rpc_entrypoint::Rpc_entrypoint(Cap_session *cap_session, size_t stack_size,
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char const *name, bool start_on_construction,
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Affinity::Location location)
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:
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Thread_base(name, stack_size),
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_cap(Untyped_capability()),
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_curr_obj(0), _cap_valid(Lock::LOCKED), _delay_start(Lock::LOCKED),
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_delay_exit(Lock::LOCKED),
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_cap_session(cap_session)
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{
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/* set CPU affinity, if specified */
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if (location.valid())
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env()->cpu_session()->affinity(Thread_base::cap(), location);
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Thread_base::start();
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_block_until_cap_valid();
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if (start_on_construction)
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activate();
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_exit_cap = manage(&_exit_handler);
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}
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Rpc_entrypoint::~Rpc_entrypoint()
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{
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typedef Object_pool<Rpc_object_base> Pool;
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/*
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* We have to make sure the server loop is running which is only the case
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* if the Rpc_entrypoint was actived before we execute the RPC call.
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*/
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_delay_start.unlock();
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/* leave server loop */
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_exit_cap.call<Exit::Rpc_exit>();
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dissolve(&_exit_handler);
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if (Pool::first()) {
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PWRN("Object pool not empty in %s", __func__);
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/* dissolve all objects - objects are not destroyed! */
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while (Rpc_object_base *obj = Pool::first())
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_dissolve(obj);
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}
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/*
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* Now that we finished the 'dissolve' steps above (which need a working
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* 'Ipc_server' in the context of the entrypoint thread), we can allow the
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* entrypoint thread to leave the scope. Thereby, the 'Ipc_server' object
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* will get destructed.
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*/
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_delay_exit.unlock();
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join();
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}
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