64 lines
1.2 KiB
C++
64 lines
1.2 KiB
C++
/*
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* \brief Lock implementation
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* \author Norman Feske
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* \date 2007-10-15
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*/
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/*
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* Copyright (C) 2007-2012 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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/* Genode includes */
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#include <base/cancelable_lock.h>
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#include <base/printf.h>
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#include <cpu/atomic.h>
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/* Codezero includes */
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#include <codezero/syscalls.h>
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using namespace Genode;
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Cancelable_lock::Cancelable_lock(Cancelable_lock::State initial)
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:
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_native_lock(UNLOCKED)
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{
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if (initial == LOCKED)
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lock();
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}
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void Cancelable_lock::lock()
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{
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while (!cmpxchg(&_native_lock, UNLOCKED, LOCKED))
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Codezero::l4_thread_switch(-1);
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}
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void Cancelable_lock::unlock()
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{
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_native_lock = UNLOCKED;
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}
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/*
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* Printf implementation to make Codezero's syscall bindings happy.
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*
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* We need a better place for this function - actually, the best would be not
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* to need this function at all. As of now, 'printf' is referenced by
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* Codezero's libl4, in particular by the mutex implementation.
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*/
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extern "C" void printf(const char *format, ...) __attribute__((weak));
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extern "C" void printf(const char *format, ...)
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{
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va_list list;
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va_start(list, format);
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vprintf(format, list);
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va_end(list);
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}
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