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1 /*
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2 * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
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3 *
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4 * This file is part of FFmpeg.
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5 *
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6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
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8 * License as published by the Free Software Foundation; either
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9 * version 2.1 of the License, or (at your option) any later version.
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10 *
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11 * FFmpeg is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * Lesser General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU Lesser General Public
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17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 */
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20
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21 #ifndef AVUTIL_ATOMIC_H
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22 #define AVUTIL_ATOMIC_H
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23
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24 #include "config.h"
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25
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26 #if HAVE_ATOMICS_NATIVE
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27
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28 #if HAVE_ATOMICS_GCC
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29 #include "atomic_gcc.h"
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30 #elif HAVE_ATOMICS_WIN32
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31 #include "atomic_win32.h"
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32 #elif HAVE_ATOMICS_SUNCC
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33 #include "atomic_suncc.h"
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34 #endif
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35
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36 #else
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37
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38 /**
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39 * Load the current value stored in an atomic integer.
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40 *
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41 * @param ptr atomic integer
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42 * @return the current value of the atomic integer
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43 * @note This acts as a memory barrier.
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44 */
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45 int avpriv_atomic_int_get(volatile int *ptr);
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46
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47 /**
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48 * Store a new value in an atomic integer.
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49 *
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50 * @param ptr atomic integer
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51 * @param val the value to store in the atomic integer
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52 * @note This acts as a memory barrier.
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53 */
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54 void avpriv_atomic_int_set(volatile int *ptr, int val);
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55
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56 /**
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57 * Add a value to an atomic integer.
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58 *
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59 * @param ptr atomic integer
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60 * @param inc the value to add to the atomic integer (may be negative)
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61 * @return the new value of the atomic integer.
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62 * @note This does NOT act as a memory barrier. This is primarily
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63 * intended for reference counting.
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64 */
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65 int avpriv_atomic_int_add_and_fetch(volatile int *ptr, int inc);
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66
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67 /**
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68 * Atomic pointer compare and swap.
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69 *
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70 * @param ptr pointer to the pointer to operate on
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71 * @param oldval do the swap if the current value of *ptr equals to oldval
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72 * @param newval value to replace *ptr with
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73 * @return the value of *ptr before comparison
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74 */
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75 void *avpriv_atomic_ptr_cas(void * volatile *ptr, void *oldval, void *newval);
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76
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77 #endif /* HAVE_ATOMICS_NATIVE */
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78
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79 #endif /* AVUTIL_ATOMIC_H */
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