198 lines
4.0 KiB
C++
198 lines
4.0 KiB
C++
/*
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* \brief POSIX thread header
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* \author Christian Prochaska
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* \author Alexander Boettcher
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* \date 2012-03-12
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*
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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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#ifndef _INCLUDE__SRC_LIB_PTHREAD_THREAD_H_
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#define _INCLUDE__SRC_LIB_PTHREAD_THREAD_H_
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/* Genode includes */
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#include <util/reconstructible.h>
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#include <pthread.h>
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/*
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* Used by 'pthread_self()' to find out if the current thread is an alien
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* thread.
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*/
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class Pthread_registry
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{
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private:
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enum { MAX_NUM_PTHREADS = 128 };
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pthread_t _array[MAX_NUM_PTHREADS] = { 0 };
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public:
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void insert(pthread_t thread);
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void remove(pthread_t thread);
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bool contains(pthread_t thread);
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};
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Pthread_registry &pthread_registry();
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extern "C" {
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struct pthread_attr
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{
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pthread_t pthread;
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size_t stack_size;
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pthread_attr() : pthread(0), stack_size(0) { }
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};
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/*
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* This class is named 'struct pthread' because the 'pthread_t' type is
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* defined as 'struct pthread*' in '_pthreadtypes.h'
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*/
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struct pthread;
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void pthread_cleanup();
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}
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struct Genode::Thread::Tls::Base
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{
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/**
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* Register thread-local-storage object at Genode thread
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*/
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static void tls(Genode::Thread &thread, Tls::Base &tls)
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{
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thread._tls = Tls { &tls };
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}
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struct Undefined : Exception { };
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/**
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* Obtain thread-local-storage object for the calling thread
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*
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* \throw Undefined
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*/
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static Tls::Base &tls()
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{
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Thread &myself = *Thread::myself();
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if (!myself._tls.ptr)
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throw Undefined();
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return *myself._tls.ptr;
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}
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};
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struct pthread : Genode::Noncopyable, Genode::Thread::Tls::Base
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{
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typedef void *(*start_routine_t) (void *);
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private:
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struct Thread_object : Genode::Thread
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{
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start_routine_t _start_routine;
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void *_arg;
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enum { WEIGHT = Genode::Cpu_session::Weight::DEFAULT_WEIGHT };
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Thread_object(char const *name, size_t stack_size,
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Genode::Cpu_session *cpu,
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Genode::Affinity::Location location,
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start_routine_t start_routine, void *arg)
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:
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Genode::Thread(WEIGHT, name, stack_size, Type::NORMAL, cpu, location),
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_start_routine(start_routine), _arg(arg)
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{ }
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void entry() override
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{
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void *exit_status = _start_routine(_arg);
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pthread_exit(exit_status);
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}
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};
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Genode::Constructible<Thread_object> _thread_object;
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/*
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* Helper to construct '_thread_object' in class initializer
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*/
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template <typename... ARGS>
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Genode::Thread &_construct_thread_object(ARGS &&... args)
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{
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_thread_object.construct(args...);
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return *_thread_object;
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}
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/*
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* Refers to '_thread_object' or an external 'Genode::Thread' object
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*/
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Genode::Thread &_thread;
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pthread_attr_t _attr;
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void _associate_thread_with_pthread()
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{
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if (_attr)
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_attr->pthread = this;
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Genode::Thread::Tls::Base::tls(_thread, *this);
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pthread_registry().insert(this);
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}
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public:
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/**
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* Constructor for threads created via 'pthread_create'
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*/
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pthread(pthread_attr_t attr, start_routine_t start_routine,
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void *arg, size_t stack_size, char const * name,
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Genode::Cpu_session * cpu, Genode::Affinity::Location location)
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:
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_thread(_construct_thread_object(name, stack_size, cpu, location,
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start_routine, arg)),
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_attr(attr)
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{
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_associate_thread_with_pthread();
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}
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/**
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* Constructor to create pthread object out of existing thread,
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* i.e., the main thread
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*/
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pthread(Genode::Thread &existing_thread, pthread_attr_t attr)
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:
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_thread(existing_thread),
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_attr(attr)
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{
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_associate_thread_with_pthread();
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}
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~pthread()
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{
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pthread_registry().remove(this);
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}
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void start() { _thread.start(); }
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void *stack_top() const { return _thread.stack_top(); }
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void *stack_base() const { return _thread.stack_base(); }
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pthread_attr_t attr() { return _attr; }
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};
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#endif /* _INCLUDE__SRC_LIB_PTHREAD_THREAD_H_ */
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