389 lines
10 KiB
C++
389 lines
10 KiB
C++
/*
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* \brief Core implementation of the CPU session/thread interfaces
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* \author Christian Helmuth
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* \date 2006-07-17
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*
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* FIXME arg_string and quota missing
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*/
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/*
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* Copyright (C) 2006-2017 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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/* Genode includes */
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#include <base/log.h>
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#include <util/arg_string.h>
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/* core includes */
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#include <cpu_session_component.h>
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#include <rm_session_component.h>
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#include <pd_session_component.h>
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#include <platform_generic.h>
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using namespace Genode;
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Thread_capability Cpu_session_component::create_thread(Capability<Pd_session> pd_cap,
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Name const &name,
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Affinity::Location affinity,
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Weight weight,
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addr_t utcb)
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{
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Trace::Thread_name thread_name(name.string());
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withdraw(Ram_quota{_utcb_quota_size()});
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Cpu_thread_component *thread = 0;
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if (weight.value == 0) {
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warning("Thread ", name, ": Bad weight 0, using default weight instead.");
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weight = Weight();
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}
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if (weight.value > QUOTA_LIMIT) {
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warning("Thread ", name, ": Oversized weight ", weight.value, ", using limit instead.");
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weight = Weight(QUOTA_LIMIT);
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}
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Mutex::Guard thread_list_lock_guard(_thread_list_lock);
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/*
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* Create thread associated with its protection domain
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*/
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auto create_thread_lambda = [&] (Pd_session_component *pd) {
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if (!pd) {
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error("create_thread: invalid PD argument");
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throw Thread_creation_failed();
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}
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Mutex::Guard slab_lock_guard(_thread_alloc_lock);
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thread = new (&_thread_alloc)
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Cpu_thread_component(
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cap(), _thread_ep, _pager_ep, *pd, _trace_control_area,
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_trace_sources, weight, _weight_to_quota(weight.value),
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_thread_affinity(affinity), _label, thread_name,
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_priority, utcb);
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};
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try {
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_incr_weight(weight.value);
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_thread_ep.apply(pd_cap, create_thread_lambda);
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} catch (Allocator::Out_of_memory) {
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_decr_weight(weight.value);
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throw Out_of_ram();
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} catch (Native_capability::Reference_count_overflow) {
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_decr_weight(weight.value);
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throw Thread_creation_failed();
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} catch (...) {
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_decr_weight(weight.value);
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throw;
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}
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thread->session_exception_sigh(_exception_sigh);
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_thread_list.insert(thread);
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return thread->cap();
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}
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Affinity::Location Cpu_session_component::_thread_affinity(Affinity::Location location) const
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{
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/* convert session-local location to physical location */
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int const x1 = location.xpos() + _location.xpos(),
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y1 = location.ypos() + _location.ypos(),
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x2 = location.xpos() + location.width(),
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y2 = location.ypos() + location.height();
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int const clipped_x1 = max(_location.xpos(), x1),
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clipped_y1 = max(_location.ypos(), y1),
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clipped_x2 = max(_location.xpos() + (int)_location.width() - 1, x2),
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clipped_y2 = max(_location.ypos() + (int)_location.height() - 1, y2);
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return Affinity::Location(clipped_x1, clipped_y1,
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clipped_x2 - clipped_x1 + 1,
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clipped_y2 - clipped_y1 + 1);
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}
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void Cpu_session_component::_unsynchronized_kill_thread(Thread_capability thread_cap)
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{
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Cpu_thread_component *thread = nullptr;
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_thread_ep.apply(thread_cap, [&] (Cpu_thread_component *t) { thread = t; });
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if (!thread) return;
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_thread_list.remove(thread);
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_decr_weight(thread->weight());
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{
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Mutex::Guard lock_guard(_thread_alloc_lock);
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destroy(&_thread_alloc, thread);
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}
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replenish(Ram_quota{_utcb_quota_size()});
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}
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void Cpu_session_component::kill_thread(Thread_capability thread_cap)
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{
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if (!thread_cap.valid())
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return;
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Mutex::Guard lock_guard(_thread_list_lock);
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/* check that cap belongs to this session */
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for (Cpu_thread_component *t = _thread_list.first(); t; t = t->next()) {
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if (t->cap() == thread_cap) {
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_unsynchronized_kill_thread(thread_cap);
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break;
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}
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}
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}
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void Cpu_session_component::exception_sigh(Signal_context_capability sigh)
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{
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_exception_sigh = sigh;
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Mutex::Guard lock_guard(_thread_list_lock);
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for (Cpu_thread_component *t = _thread_list.first(); t; t = t->next())
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t->session_exception_sigh(_exception_sigh);
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}
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Affinity::Space Cpu_session_component::affinity_space() const
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{
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/*
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* Return affinity subspace as constrained by the CPU session
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* affinity.
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*/
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return Affinity::Space(_location.width(), _location.height());
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}
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Dataspace_capability Cpu_session_component::trace_control()
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{
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return _trace_control_area.dataspace();
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}
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void Cpu_session_component::_transfer_quota(Cpu_session_component &dst,
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size_t const quota)
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{
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if (!quota) { return; }
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_decr_quota(quota);
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dst._incr_quota(quota);
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}
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int Cpu_session_component::transfer_quota(Cpu_session_capability dst_cap,
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size_t amount)
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{
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/* lookup targeted CPU session */
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auto lambda = [&] (Cpu_session_component *dst) {
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if (!dst) {
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warning("Transfer CPU quota, ", _label, ", targeted session not found");
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return -1;
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}
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/* check reference relationship */
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if (dst->_ref != this && dst != _ref) {
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warning("Transfer CPU quota, ", _label, " -> ", dst->_label, ", "
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"no reference relation");
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return -2;
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}
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/* check quota availability */
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size_t const quota = quota_lim_downscale(_quota, amount);
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if (quota > _quota) {
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warning("Transfer CPU quota, ", _label, " -> ", dst->_label, ", "
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"insufficient quota ", _quota, ", need ", quota);
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return -3;
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}
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/* transfer quota */
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_transfer_quota(*dst, quota);
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return 0;
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};
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return _session_ep.apply(dst_cap, lambda);
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}
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int Cpu_session_component::ref_account(Cpu_session_capability ref_cap)
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{
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/*
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* Ensure that the ref account is set only once
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*
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* FIXME Add check for cycles along the tree of reference accounts
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*/
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if (_ref) {
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warning("set ref account, ", _label, ", set already");
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return -2; }
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/* lookup and check targeted CPU-session */
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auto lambda = [&] (Cpu_session_component *ref) {
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if (!ref) {
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warning("set ref account, ", _label, ", targeted session not found");
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return -1;
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}
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if (ref == this) {
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warning("set ref account, ", _label, ", self reference not allowed");
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return -3;
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}
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/* establish ref-account relation from targeted CPU-session to us */
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_ref = ref;
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_ref->_insert_ref_member(this);
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return 0;
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};
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return _session_ep.apply(ref_cap, lambda);
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}
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Cpu_session_component::Cpu_session_component(Rpc_entrypoint &session_ep,
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Resources const &resources,
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Label const &label,
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Diag const &diag,
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Ram_allocator &ram_alloc,
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Region_map &local_rm,
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Rpc_entrypoint &thread_ep,
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Pager_entrypoint &pager_ep,
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Trace::Source_registry &trace_sources,
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char const *args,
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Affinity const &affinity,
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size_t const quota)
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:
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Session_object(session_ep, resources, label, diag),
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_session_ep(session_ep), _thread_ep(thread_ep), _pager_ep(pager_ep),
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_ram_alloc(ram_alloc, _ram_quota_guard(), _cap_quota_guard()),
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_md_alloc(_ram_alloc, local_rm),
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_thread_alloc(_md_alloc), _priority(0),
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/* map affinity to a location within the physical affinity space */
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_location(affinity.scale_to(platform().affinity_space())),
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_trace_sources(trace_sources),
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_trace_control_area(_ram_alloc, local_rm),
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_quota(quota), _ref(0),
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_native_cpu(*this, args)
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{
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Arg a = Arg_string::find_arg(args, "priority");
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if (a.valid()) {
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_priority = a.ulong_value(0);
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/* clamp priority value to valid range */
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_priority = min((unsigned)PRIORITY_LIMIT - 1, _priority);
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}
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}
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Cpu_session_component::~Cpu_session_component()
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{
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_deinit_threads();
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_deinit_ref_account();
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}
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void Cpu_session_component::_deinit_ref_account()
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{
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/* rewire child ref accounts to this sessions's ref account */
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{
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Mutex::Guard lock_guard(_ref_members_lock);
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for (Cpu_session_component * s; (s = _ref_members.first()); ) {
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_unsync_remove_ref_member(*s);
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if (_ref)
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_ref->_insert_ref_member(s);
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}
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}
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if (_ref) {
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/* give back our remaining quota to our ref account */
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_transfer_quota(*_ref, _quota);
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/* remove ref-account relation between us and our ref-account */
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_ref->_remove_ref_member(*this);
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}
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}
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void Cpu_session_component::_deinit_threads()
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{
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Mutex::Guard lock_guard(_thread_list_lock);
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/*
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* We have to keep the '_thread_list_lock' during the whole destructor to
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* prevent races with incoming calls of the 'create_thread' function,
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* adding new threads while we are destroying them.
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*/
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for (Cpu_thread_component *thread; (thread = _thread_list.first()); )
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_unsynchronized_kill_thread(thread->cap());
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}
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void Cpu_session_component::
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_update_thread_quota(Cpu_thread_component &thread) const
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{
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thread.quota(_weight_to_quota(thread.weight()));
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}
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void Cpu_session_component::_incr_weight(size_t const weight)
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{
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_weight += weight;
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if (_quota) { _update_each_thread_quota(); }
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}
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void Cpu_session_component::_decr_weight(size_t const weight)
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{
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_weight -= weight;
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if (_quota) { _update_each_thread_quota(); }
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}
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void Cpu_session_component::_decr_quota(size_t const quota)
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{
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Mutex::Guard lock_guard(_thread_list_lock);
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_quota -= quota;
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_update_each_thread_quota();
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}
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void Cpu_session_component::_incr_quota(size_t const quota)
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{
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Mutex::Guard lock_guard(_thread_list_lock);
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_quota += quota;
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_update_each_thread_quota();
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}
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void Cpu_session_component::_update_each_thread_quota()
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{
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Cpu_thread_component * thread = _thread_list.first();
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for (; thread; thread = thread->next()) { _update_thread_quota(*thread); }
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}
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size_t Cpu_session_component::_weight_to_quota(size_t const weight) const
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{
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if (_weight == 0) return 0;
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return (weight * _quota) / _weight;
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}
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/****************************
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** Trace::Source_registry **
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****************************/
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unsigned Trace::Source::_alloc_unique_id()
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{
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static Mutex lock;
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static unsigned cnt;
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Mutex::Guard guard(lock);
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return cnt++;
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}
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