92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
/*
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* \brief Fiasco.OC-specific helper functions for the Lock implementation
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* \author Stefan Kalkowski
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* \author Norman Feske
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* \date 2011-02-22
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*
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* This file serves as adapter between the generic lock implementation
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* in 'lock.cc' and the underlying kernel.
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*/
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/*
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* Copyright (C) 2011-2013 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 _INCLUDE__BASE__INTERNAL__LOCK_HELPER_H_
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#define _INCLUDE__BASE__INTERNAL__LOCK_HELPER_H_
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/* Genode includes */
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#include <base/native_types.h>
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#include <base/thread.h>
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/* Fiasco.OC includes */
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namespace Fiasco {
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#include <l4/sys/kdebug.h>
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#include <l4/sys/irq.h>
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#include <l4/sys/thread.h>
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}
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/**
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* Yield CPU time
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*/
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static inline void thread_yield() { Fiasco::l4_thread_yield(); }
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/**
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* Custom ExchangeRegisters wrapper for waking up a thread
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*
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* When waking up an lock applicant, we need to make sure that the thread was
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* stopped beforehand. Therefore, we evaluate the previous thread state as
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* returned by the 'L4_ExchangeRegisters' call.
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*
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* \return true if the thread was in blocking state
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*/
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static inline bool thread_check_stopped_and_restart(Genode::Thread_base *thread_base)
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{
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Genode::Native_thread_id tid = thread_base ?
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thread_base->tid().kcap :
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Fiasco::MAIN_THREAD_CAP;
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Genode::Native_thread_id irq = tid + Fiasco::THREAD_IRQ_CAP;
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Fiasco::l4_irq_trigger(irq);
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return true;
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}
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/**
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* Yield CPU time to the specified thread
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*/
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static inline void thread_switch_to(Genode::Thread_base *thread_base)
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{
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Genode::Native_thread_id tid = thread_base ?
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thread_base->tid().kcap :
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Fiasco::MAIN_THREAD_CAP;
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Fiasco::l4_thread_switch(tid);
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}
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/**
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* Unconditionally block the calling thread
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*/
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/* Build with frame pointer to make GDB backtraces work. See issue #1061. */
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__attribute__((optimize("-fno-omit-frame-pointer")))
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__attribute__((noinline))
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__attribute__((used))
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static void thread_stop_myself()
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{
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using namespace Fiasco;
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Genode::Thread_base *myself = Genode::Thread_base::myself();
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Genode::Native_thread_id tid = myself ?
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myself->tid().kcap :
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Fiasco::MAIN_THREAD_CAP;
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Genode::Native_thread_id irq = tid + THREAD_IRQ_CAP;
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l4_irq_receive(irq, L4_IPC_NEVER);
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}
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#endif /* _INCLUDE__BASE__INTERNAL__LOCK_HELPER_H_ */
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