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| Rev | Author | Line No. | Line |
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| 1111 | jermar | 1 | /* |
| 2680 | jermar | 2 | * Copyright (c) 2008 Jakub Jermar |
| 1111 | jermar | 3 | * All rights reserved. |
| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 1866 | jermar | 29 | /** @addtogroup libc |
| 1653 | cejka | 30 | * @{ |
| 31 | */ |
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| 2680 | jermar | 32 | /** |
| 33 | * @file |
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| 34 | * @brief This file contains rwlock API and provides its fake |
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| 35 | * implementation based on futexes. |
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| 1653 | cejka | 36 | */ |
| 37 | |||
| 2680 | jermar | 38 | #ifndef LIBC_RWLOCK_H_ |
| 39 | #define LIBC_RWLOCK_H_ |
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| 1111 | jermar | 40 | |
| 41 | #include <atomic.h> |
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| 2541 | jermar | 42 | #include <sys/types.h> |
| 2680 | jermar | 43 | #include <futex.h> |
| 1111 | jermar | 44 | |
| 2680 | jermar | 45 | typedef atomic_t rwlock_t; |
| 1143 | palkovsky | 46 | |
| 2681 | jermar | 47 | #define RWLOCK_INITIALIZE(rwlock) \ |
| 48 | rwlock_t rwlock = FUTEX_INITIALIZER |
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| 49 | |||
| 2680 | jermar | 50 | #define rwlock_initialize(rwlock) futex_initialize((rwlock), 1) |
| 2688 | jermar | 51 | #define rwlock_read_lock(rwlock) futex_down((rwlock)) |
| 52 | #define rwlock_write_lock(rwlock) futex_down((rwlock)) |
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| 53 | #define rwlock_read_unlock(rwlock) futex_up((rwlock)) |
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| 54 | #define rwlock_write_unlock(rwlock) futex_up((rwlock)) |
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| 1111 | jermar | 55 | |
| 56 | #endif |
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| 1653 | cejka | 57 | |
| 1866 | jermar | 58 | /** @} |
| 1653 | cejka | 59 | */ |