165 lines
3.5 KiB
C++
165 lines
3.5 KiB
C++
/*
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* \brief Linux thread facility
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* \author Norman Feske
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* \date 2006-06-13
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*
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* Pretty dumb.
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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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#ifndef _CORE__INCLUDE__LINUX__PLATFORM_THREAD_H_
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#define _CORE__INCLUDE__LINUX__PLATFORM_THREAD_H_
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#include <base/pager.h>
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#include <base/thread_state.h>
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#include <cpu_session/cpu_session.h>
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namespace Genode {
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class Platform_thread;
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/*
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* We hold all Platform_thread objects in a list in order to be able to
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* reflect SIGCHLD as exception signals. When a SIGCHILD occurs, we
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* determine the PID of the terminated child process via 'wait4'. We use
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* the list to find the 'Platform_thread' matching the TID, wherei, in
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* turn, we find the exception handler's 'Signal_context_capability'.
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*/
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class Platform_thread : public List<Platform_thread>::Element
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{
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private:
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struct Registry
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{
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Lock _lock;
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List<Platform_thread> _list;
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void insert(Platform_thread *thread);
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void remove(Platform_thread *thread);
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/**
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* Trigger exception handler for 'Platform_thread' with matching PID.
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*/
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void submit_exception(unsigned long pid);
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};
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/**
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* Return singleton instance of 'Platform_thread::Registry'
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*/
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static Registry *_registry();
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unsigned long _tid;
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unsigned long _pid;
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char _name[32];
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/**
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* Unix-domain socket pair bound to the thread
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*/
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Native_connection_state _ncs;
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/*
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* Dummy pager object that is solely used for storing the
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* 'Signal_context_capability' for the thread's exception handler.
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*/
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Pager_object _pager;
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public:
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/**
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* Constructor
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*/
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Platform_thread(const char *name, unsigned priority, addr_t);
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~Platform_thread();
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/**
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* Cancel currently blocking operation
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*/
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void cancel_blocking();
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/**
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* Pause this thread
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*/
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void pause();
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/**
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* Resume this thread
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*/
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void resume();
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/**
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* Dummy implementation of platform-thread interface
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*/
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Pager_object *pager() { return &_pager; }
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void pager(Pager_object *) { }
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int start(void *ip, void *sp) { return 0; }
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Thread_state state()
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{
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PDBG("Not implemented");
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throw Cpu_session::State_access_failed();
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}
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void state(Thread_state)
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{
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PDBG("Not implemented");
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throw Cpu_session::State_access_failed();
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}
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const char *name() { return _name; }
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/**
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* Set the executing CPU for this thread
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*
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* SMP is currently not directly supported on Genode/Linux
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* (but indirectly by the Linux kernel).
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*/
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void affinity(Affinity::Location) { }
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/**
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* Request the affinity of this thread
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*/
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Affinity::Location affinity() { return Affinity::Location(); }
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/**
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* Register process ID and thread ID of thread
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*/
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void thread_id(int pid, int tid) { _pid = pid, _tid = tid; }
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/**
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* Return client-side socket descriptor
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*
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* For more information, please refer to the comments in
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* 'linux_cpu_session/linux_cpu_session.h'.
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*/
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int client_sd();
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/**
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* Return server-side socket descriptor
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*/
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int server_sd();
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/**
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* Notify Genode::Signal handler about sigchld
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*/
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static void submit_exception(int pid)
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{
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_registry()->submit_exception(pid);
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}
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/**
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* Set CPU quota of the thread to 'quota'
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*/
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void quota(size_t const quota) { /* not supported*/ }
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};
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}
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#endif /* _CORE__INCLUDE__LINUX__PLATFORM_THREAD_H_ */
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