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d866b6b053
The 'Thread_creation_failed' error is now reflected as 'Thread::Start_result' return value. This change also removes the use of 'Invalid_thread' within core as this exception is an alias of Cpu_session::Thread_creation_failed. Issue #5245
138 lines
3.6 KiB
C++
138 lines
3.6 KiB
C++
/**
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* \brief Implementations for the start of a thread
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2012-02-12
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*/
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/*
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* Copyright (C) 2012-2017 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/thread.h>
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#include <base/log.h>
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#include <base/sleep.h>
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#include <base/env.h>
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#include <cpu_thread/client.h>
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/* base-internal includes */
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#include <base/internal/stack_allocator.h>
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#include <base/internal/native_utcb.h>
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#include <base/internal/globals.h>
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using namespace Genode;
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namespace Hw {
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extern Ram_dataspace_capability _main_thread_utcb_ds;
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extern Untyped_capability _main_thread_cap;
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}
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static Capability<Pd_session> pd_session_cap(Capability<Pd_session> pd_cap = { })
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{
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static Capability<Pd_session> cap = pd_cap; /* defined once by 'init_thread_start' */
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return cap;
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}
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static Thread_capability main_thread_cap(Thread_capability main_cap = { })
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{
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static Thread_capability cap = main_cap;
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return cap;
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}
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/************
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** Thread **
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************/
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void Thread::_init_platform_thread(size_t weight, Type type)
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{
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_init_cpu_session_and_trace_control();
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if (type == NORMAL) {
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/* create server object */
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addr_t const utcb = (addr_t)&_stack->utcb();
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_thread_cap = _cpu_session->create_thread(pd_session_cap(), name(), _affinity,
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Weight(weight), utcb);
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return;
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}
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/* if we got reinitialized we have to get rid of the old UTCB */
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size_t const utcb_size = sizeof(Native_utcb);
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addr_t const stack_area = stack_area_virtual_base();
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addr_t const utcb_new = (addr_t)&_stack->utcb() - stack_area;
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Region_map * const rm = env_stack_area_region_map;
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/* remap initial main-thread UTCB according to stack-area spec */
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try { rm->attach_at(Hw::_main_thread_utcb_ds, utcb_new, utcb_size); }
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catch(...) {
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error("failed to re-map UTCB");
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while (1) ;
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}
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/* adjust initial object state in case of a main thread */
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native_thread().cap = Hw::_main_thread_cap;
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_thread_cap = main_thread_cap();
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}
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void Thread::_deinit_platform_thread()
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{
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if (!_cpu_session) {
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error("Thread::_cpu_session unexpectedly not defined");
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return;
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}
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_thread_cap.with_result(
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[&] (Thread_capability cap) { _cpu_session->kill_thread(cap); },
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[&] (Cpu_session::Create_thread_error) { });
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/* detach userland stack */
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size_t const size = sizeof(_stack->utcb());
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addr_t utcb = Stack_allocator::addr_to_base(_stack) +
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stack_virtual_size() - size - stack_area_virtual_base();
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env_stack_area_region_map->detach(utcb);
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}
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Thread::Start_result Thread::start()
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{
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return _thread_cap.convert<Start_result>(
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[&] (Thread_capability cap) {
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Cpu_thread_client cpu_thread(cap);
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/* attach UTCB at top of stack */
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size_t const size = sizeof(_stack->utcb());
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addr_t dst = Stack_allocator::addr_to_base(_stack) +
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stack_virtual_size() - size - stack_area_virtual_base();
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try {
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env_stack_area_region_map->attach_at(cpu_thread.utcb(), dst, size);
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} catch (...) {
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error("failed to attach userland stack");
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sleep_forever();
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}
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/* start execution with initial IP and aligned SP */
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cpu_thread.start((addr_t)_thread_start, _stack->top());
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return Start_result::OK;
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},
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[&] (Cpu_session::Create_thread_error) { return Start_result::DENIED; }
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);
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}
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void Genode::init_thread_start(Capability<Pd_session> pd_cap)
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{
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pd_session_cap(pd_cap);
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}
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void Genode::init_thread_bootstrap(Cpu_session &, Thread_capability main_cap)
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{
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main_thread_cap(main_cap);
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}
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