Wed, 05 Jun 2024 19:50:44 +0200
add extra nullptr check in the event loop to handle the case when the finish ptr is set to NULL after it was already scheduled
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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. 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 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | /** |
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30 | * \file utils.h |
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31 | * |
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32 | * \brief General purpose utility functions. |
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33 | * |
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34 | * \author Mike Becker |
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35 | * \author Olaf Wintermann |
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36 | * \version 3.0 |
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37 | * \copyright 2-Clause BSD License |
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38 | */ |
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39 | |
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40 | #ifndef UCX_UTILS_H |
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41 | #define UCX_UTILS_H |
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42 | |
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43 | #include "common.h" |
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44 | |
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45 | #ifdef __cplusplus |
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46 | extern "C" { |
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47 | #endif |
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48 | |
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49 | /** |
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50 | * Convenience macro for a for loop that counts from zero to n-1. |
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51 | */ |
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52 | #define cx_for_n(varname, n) for (size_t varname = 0 ; (varname) < (n) ; (varname)++) |
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53 | |
490 | 54 | /** |
55 | * Convenience macro for swapping two pointers. | |
56 | */ | |
57 | #ifdef __cplusplus | |
58 | #define cx_swap_ptr(left, right) do {auto cx_tmp_swap_var = left; left = right; right = cx_tmp_swap_var;} while(0) | |
59 | #else | |
60 | #define cx_swap_ptr(left, right) do {void *cx_tmp_swap_var = left; left = right; right = cx_tmp_swap_var;} while(0) | |
61 | #endif | |
62 | ||
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63 | // cx_szmul() definition |
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64 | |
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65 | #if (__GNUC__ >= 5 || defined(__clang__)) && !defined(CX_NO_SZMUL_BUILTIN) |
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66 | #define CX_SZMUL_BUILTIN |
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67 | |
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68 | /** |
490 | 69 | * Alias for \c __builtin_mul_overflow. |
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70 | * |
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71 | * Performs a multiplication of size_t values and checks for overflow. |
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72 | * |
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73 | * @param a first operand |
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74 | * @param b second operand |
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75 | * @param result a pointer to a size_t, where the result should |
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76 | * be stored |
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77 | * @return zero, if no overflow occurred and the result is correct, non-zero |
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78 | * otherwise |
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79 | */ |
490 | 80 | #define cx_szmul(a, b, result) __builtin_mul_overflow(a, b, result) |
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81 | |
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82 | #else // no GNUC or clang bultin |
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83 | |
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84 | /** |
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85 | * Performs a multiplication of size_t values and checks for overflow. |
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86 | * |
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87 | * @param a first operand |
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88 | * @param b second operand |
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89 | * @param result a pointer to a size_t, where the result should |
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90 | * be stored |
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91 | * @return zero, if no overflow occurred and the result is correct, non-zero |
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92 | * otherwise |
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93 | */ |
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94 | #define cx_szmul(a, b, result) cx_szmul_impl(a, b, result) |
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95 | |
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96 | /** |
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97 | * Performs a multiplication of size_t values and checks for overflow. |
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98 | * |
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99 | * This is a custom implementation in case there is no compiler builtin |
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100 | * available. |
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101 | * |
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102 | * @param a first operand |
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103 | * @param b second operand |
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104 | * @param result a pointer to a size_t where the result should be stored |
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105 | * @return zero, if no overflow occurred and the result is correct, non-zero |
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106 | * otherwise |
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107 | */ |
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108 | int cx_szmul_impl(size_t a, size_t b, size_t *result); |
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109 | |
490 | 110 | #endif // cx_szmul |
111 | ||
112 | ||
113 | /** | |
114 | * Reads data from a stream and writes it to another stream. | |
115 | * | |
116 | * @param src the source stream | |
117 | * @param dest the destination stream | |
118 | * @param rfnc the read function | |
119 | * @param wfnc the write function | |
120 | * @param buf a pointer to the copy buffer or \c NULL if a buffer | |
121 | * shall be implicitly created on the heap | |
122 | * @param bufsize the size of the copy buffer - if \p buf is \c NULL you can | |
123 | * set this to zero to let the implementation decide | |
124 | * @param n the maximum number of bytes that shall be copied. | |
125 | * If this is larger than \p bufsize, the content is copied over multiple | |
126 | * iterations. | |
127 | * @return the total number of bytes copied | |
128 | */ | |
129 | __attribute__((__nonnull__(1, 2, 3, 4))) | |
130 | size_t cx_stream_bncopy( | |
131 | void *src, | |
132 | void *dest, | |
133 | cx_read_func rfnc, | |
134 | cx_write_func wfnc, | |
135 | char *buf, | |
136 | size_t bufsize, | |
137 | size_t n | |
138 | ); | |
139 | ||
140 | /** | |
141 | * Reads data from a stream and writes it to another stream. | |
142 | * | |
143 | * @param src the source stream | |
144 | * @param dest the destination stream | |
145 | * @param rfnc the read function | |
146 | * @param wfnc the write function | |
147 | * @param buf a pointer to the copy buffer or \c NULL if a buffer | |
148 | * shall be implicitly created on the heap | |
149 | * @param bufsize the size of the copy buffer - if \p buf is \c NULL you can | |
150 | * set this to zero to let the implementation decide | |
151 | * @return total number of bytes copied | |
152 | */ | |
153 | #define cx_stream_bcopy(src, dest, rfnc, wfnc, buf, bufsize) \ | |
154 | cx_stream_bncopy(src, dest, rfnc, wfnc, buf, bufsize, SIZE_MAX) | |
155 | ||
156 | /** | |
157 | * Reads data from a stream and writes it to another stream. | |
158 | * | |
159 | * The data is temporarily stored in a stack allocated buffer. | |
160 | * | |
161 | * @param src the source stream | |
162 | * @param dest the destination stream | |
163 | * @param rfnc the read function | |
164 | * @param wfnc the write function | |
165 | * @param n the maximum number of bytes that shall be copied. | |
166 | * @return total number of bytes copied | |
167 | */ | |
168 | __attribute__((__nonnull__)) | |
169 | size_t cx_stream_ncopy( | |
170 | void *src, | |
171 | void *dest, | |
172 | cx_read_func rfnc, | |
173 | cx_write_func wfnc, | |
174 | size_t n | |
175 | ); | |
176 | ||
177 | /** | |
178 | * Reads data from a stream and writes it to another stream. | |
179 | * | |
180 | * The data is temporarily stored in a stack allocated buffer. | |
181 | * | |
182 | * @param src the source stream | |
183 | * @param dest the destination stream | |
184 | * @param rfnc the read function | |
185 | * @param wfnc the write function | |
186 | * @return total number of bytes copied | |
187 | */ | |
188 | #define cx_stream_copy(src, dest, rfnc, wfnc) \ | |
189 | cx_stream_ncopy(src, dest, rfnc, wfnc, SIZE_MAX) | |
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190 | |
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191 | #ifdef __cplusplus |
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192 | } |
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193 | #endif |
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194 | |
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195 | #endif // UCX_UTILS_H |