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/*
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/*
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 * Copyright (c) 2006 Jakub Jermar
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 * Copyright (c) 2008 Jakub Jermar
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 * All rights reserved.
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 * All rights reserved.
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 *
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * are met:
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 */
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 */
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/** @addtogroup libc
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/** @addtogroup libc
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 * @{
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 * @{
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 */
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 */
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/**
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/** @file
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 * @file
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 * @brief   This file contains rwlock API and provides its fake
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 *      implementation based on futexes.
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 */
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 */
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#ifndef LIBC_FUTEX_H_
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#ifndef LIBC_RWLOCK_H_
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#define LIBC_FUTEX_H_
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#define LIBC_RWLOCK_H_
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#include <atomic.h>
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#include <atomic.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <futex.h>
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#define FUTEX_INITIALIZER     {1}
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typedef atomic_t rwlock_t;
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extern void futex_initialize(atomic_t *futex, int value);
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#define rwlock_initialize(rwlock)   futex_initialize((rwlock), 1)
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extern int futex_down(atomic_t *futex);
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#define rwlock_reader_lock(rwlock)  futex_down((rwlock))
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extern int futex_trydown(atomic_t *futex);
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#define rwlock_writer_lock(rwlock)  futex_down((rwlock))
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extern int futex_down_timeout(atomic_t *futex, uint32_t usec, int flags);
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#define rwlock_reader_unlock(rwlock)    futex_up((rwlock))
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extern int futex_up(atomic_t *futex);
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#define rwlock_writer_unlock(rwlock)    futex_up((rwlock))
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#endif
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#endif
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/** @}
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/** @}
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 */
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 */