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1 | /* |
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2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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3 | * |
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4 | * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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5 | * |
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6 | * Deliantra is free software: you can redistribute it and/or modify |
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7 | * it under the terms of the GNU General Public License as published by |
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8 | * the Free Software Foundation, either version 3 of the License, or |
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9 | * (at your option) any later version. |
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10 | * |
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11 | * This program 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 |
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14 | * GNU 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 General Public License |
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17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 | * |
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19 | * The authors can be reached via e-mail to <support@deliantra.net> |
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20 | */ |
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21 | |
1 | #ifndef UTIL_H__ |
22 | #ifndef UTIL_H__ |
2 | #define UTIL_H__ |
23 | #define UTIL_H__ |
3 | |
24 | |
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25 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
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26 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
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27 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
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28 | |
4 | #if __GNUC__ >= 3 |
29 | #if __GNUC__ >= 3 |
5 | # define is_constant(c) __builtin_constant_p (c) |
30 | # define is_constant(c) __builtin_constant_p (c) |
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31 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
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32 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
6 | #else |
33 | #else |
7 | # define is_constant(c) 0 |
34 | # define is_constant(c) 0 |
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35 | # define expect(expr,value) (expr) |
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36 | # define prefetch(addr,rw,locality) |
8 | #endif |
37 | #endif |
9 | |
38 | |
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39 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
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40 | # define decltype(x) typeof(x) |
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41 | #endif |
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42 | |
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43 | // put into ifs if you are very sure that the expression |
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44 | // is mostly true or mosty false. note that these return |
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45 | // booleans, not the expression. |
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46 | #define expect_false(expr) expect ((expr) != 0, 0) |
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47 | #define expect_true(expr) expect ((expr) != 0, 1) |
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48 | |
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49 | #include <pthread.h> |
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50 | |
10 | #include <cstddef> |
51 | #include <cstddef> |
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52 | #include <cmath> |
11 | #include <new> |
53 | #include <new> |
12 | #include <vector> |
54 | #include <vector> |
13 | |
55 | |
14 | #include <glib.h> |
56 | #include <glib.h> |
15 | |
57 | |
16 | #include <shstr.h> |
58 | #include <shstr.h> |
17 | #include <traits.h> |
59 | #include <traits.h> |
18 | |
60 | |
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61 | #if DEBUG_SALLOC |
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62 | # define g_slice_alloc0(s) debug_slice_alloc0(s) |
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63 | # define g_slice_alloc(s) debug_slice_alloc(s) |
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64 | # define g_slice_free1(s,p) debug_slice_free1(s,p) |
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65 | void *g_slice_alloc (unsigned long size); |
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66 | void *g_slice_alloc0 (unsigned long size); |
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67 | void g_slice_free1 (unsigned long size, void *ptr); |
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68 | #elif PREFER_MALLOC |
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69 | # define g_slice_alloc0(s) calloc (1, (s)) |
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70 | # define g_slice_alloc(s) malloc ((s)) |
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71 | # define g_slice_free1(s,p) free ((p)) |
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72 | #endif |
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73 | |
19 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
74 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
20 | #define AUTODECL(var,expr) typeof(expr) var = (expr) |
75 | #define auto(var,expr) decltype(expr) var = (expr) |
21 | |
76 | |
22 | // very ugly macro that basicaly declares and initialises a variable |
77 | // very ugly macro that basically declares and initialises a variable |
23 | // that is in scope for the next statement only |
78 | // that is in scope for the next statement only |
24 | // works only for stuff that can be assigned 0 and converts to false |
79 | // works only for stuff that can be assigned 0 and converts to false |
25 | // (note: works great for pointers) |
80 | // (note: works great for pointers) |
26 | // most ugly macro I ever wrote |
81 | // most ugly macro I ever wrote |
27 | #define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
82 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
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83 | |
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84 | // in range including end |
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85 | #define IN_RANGE_INC(val,beg,end) \ |
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86 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
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87 | |
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88 | // in range excluding end |
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89 | #define IN_RANGE_EXC(val,beg,end) \ |
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90 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
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91 | |
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92 | void cleanup (const char *cause, bool make_core = false); |
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93 | void fork_abort (const char *msg); |
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94 | |
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95 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
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96 | // as a is often a constant while b is the variable. it is still a bug, though. |
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97 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
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98 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
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99 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? (T)a : v >(T)b ? (T)b : v; } |
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100 | |
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101 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
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102 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
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103 | template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) { v = clamp (v, (T)a, (T)b); } |
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104 | |
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105 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
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106 | |
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107 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
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108 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
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109 | |
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110 | // sign returns -1 or +1 |
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111 | template<typename T> |
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112 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
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113 | // relies on 2c representation |
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114 | template<> |
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115 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
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116 | |
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117 | // sign0 returns -1, 0 or +1 |
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118 | template<typename T> |
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119 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
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120 | |
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121 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
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122 | template<typename T> static inline T div (T val, T div) { return (val + div / 2) / div; } |
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123 | // div, round-up |
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124 | template<typename T> static inline T div_ru (T val, T div) { return (val + div - 1) / div; } |
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125 | // div, round-down |
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126 | template<typename T> static inline T div_rd (T val, T div) { return (val ) / div; } |
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127 | |
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128 | template<typename T> |
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129 | static inline T |
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130 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
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131 | { |
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132 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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133 | } |
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134 | |
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135 | // lerp, round-down |
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136 | template<typename T> |
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137 | static inline T |
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138 | lerp_rd (T val, T min_in, T max_in, T min_out, T max_out) |
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139 | { |
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140 | return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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141 | } |
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142 | |
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143 | // lerp, round-up |
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144 | template<typename T> |
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145 | static inline T |
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146 | lerp_ru (T val, T min_in, T max_in, T min_out, T max_out) |
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147 | { |
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148 | return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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149 | } |
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150 | |
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151 | // lots of stuff taken from FXT |
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152 | |
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153 | /* Rotate right. This is used in various places for checksumming */ |
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154 | //TODO: that sucks, use a better checksum algo |
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155 | static inline uint32_t |
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156 | rotate_right (uint32_t c, uint32_t count = 1) |
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157 | { |
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158 | return (c << (32 - count)) | (c >> count); |
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159 | } |
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160 | |
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161 | static inline uint32_t |
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162 | rotate_left (uint32_t c, uint32_t count = 1) |
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163 | { |
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164 | return (c >> (32 - count)) | (c << count); |
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165 | } |
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166 | |
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167 | // Return abs(a-b) |
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168 | // Both a and b must not have the most significant bit set |
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169 | static inline uint32_t |
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170 | upos_abs_diff (uint32_t a, uint32_t b) |
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171 | { |
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172 | long d1 = b - a; |
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173 | long d2 = (d1 & (d1 >> 31)) << 1; |
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174 | |
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175 | return d1 - d2; // == (b - d) - (a + d); |
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176 | } |
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177 | |
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178 | // Both a and b must not have the most significant bit set |
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179 | static inline uint32_t |
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180 | upos_min (uint32_t a, uint32_t b) |
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181 | { |
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182 | int32_t d = b - a; |
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183 | d &= d >> 31; |
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184 | return a + d; |
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185 | } |
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186 | |
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187 | // Both a and b must not have the most significant bit set |
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188 | static inline uint32_t |
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189 | upos_max (uint32_t a, uint32_t b) |
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190 | { |
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191 | int32_t d = b - a; |
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192 | d &= d >> 31; |
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193 | return b - d; |
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194 | } |
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195 | |
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196 | // this is much faster than crossfires original algorithm |
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197 | // on modern cpus |
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198 | inline int |
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199 | isqrt (int n) |
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200 | { |
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201 | return (int)sqrtf ((float)n); |
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202 | } |
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203 | |
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204 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
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205 | #if 0 |
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206 | // and has a max. error of 6 in the range -100..+100. |
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207 | #else |
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208 | // and has a max. error of 9 in the range -100..+100. |
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209 | #endif |
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210 | inline int |
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211 | idistance (int dx, int dy) |
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212 | { |
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213 | unsigned int dx_ = abs (dx); |
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214 | unsigned int dy_ = abs (dy); |
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215 | |
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216 | #if 0 |
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217 | return dx_ > dy_ |
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218 | ? (dx_ * 61685 + dy_ * 26870) >> 16 |
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219 | : (dy_ * 61685 + dx_ * 26870) >> 16; |
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220 | #else |
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221 | return dx_ + dy_ - min (dx_, dy_) * 5 / 8; |
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222 | #endif |
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223 | } |
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224 | |
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225 | /* |
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226 | * absdir(int): Returns a number between 1 and 8, which represent |
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227 | * the "absolute" direction of a number (it actually takes care of |
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228 | * "overflow" in previous calculations of a direction). |
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229 | */ |
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230 | inline int |
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231 | absdir (int d) |
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232 | { |
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233 | return ((d - 1) & 7) + 1; |
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234 | } |
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235 | |
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236 | extern ssize_t slice_alloc; // statistics |
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237 | |
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238 | void *salloc_ (int n) throw (std::bad_alloc); |
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239 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
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240 | |
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241 | // strictly the same as g_slice_alloc, but never returns 0 |
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242 | template<typename T> |
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243 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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244 | |
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245 | // also copies src into the new area, like "memdup" |
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246 | // if src is 0, clears the memory |
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247 | template<typename T> |
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248 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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249 | |
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250 | // clears the memory |
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251 | template<typename T> |
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252 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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253 | |
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254 | // for symmetry |
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255 | template<typename T> |
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256 | inline void sfree (T *ptr, int n = 1) throw () |
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257 | { |
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258 | if (expect_true (ptr)) |
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259 | { |
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260 | slice_alloc -= n * sizeof (T); |
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261 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
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262 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
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263 | assert (slice_alloc >= 0);//D |
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264 | } |
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265 | } |
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266 | |
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267 | // nulls the pointer |
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268 | template<typename T> |
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269 | inline void sfree0 (T *&ptr, int n = 1) throw () |
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270 | { |
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271 | sfree<T> (ptr, n); |
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272 | ptr = 0; |
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273 | } |
28 | |
274 | |
29 | // makes dynamically allocated objects zero-initialised |
275 | // makes dynamically allocated objects zero-initialised |
30 | struct zero_initialised |
276 | struct zero_initialised |
31 | { |
277 | { |
32 | void *operator new (size_t s, void *p) |
278 | void *operator new (size_t s, void *p) |
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35 | return p; |
281 | return p; |
36 | } |
282 | } |
37 | |
283 | |
38 | void *operator new (size_t s) |
284 | void *operator new (size_t s) |
39 | { |
285 | { |
40 | return g_slice_alloc0 (s); |
286 | return salloc0<char> (s); |
41 | } |
287 | } |
42 | |
288 | |
43 | void *operator new[] (size_t s) |
289 | void *operator new[] (size_t s) |
44 | { |
290 | { |
45 | return g_slice_alloc0 (s); |
291 | return salloc0<char> (s); |
46 | } |
292 | } |
47 | |
293 | |
48 | void operator delete (void *p, size_t s) |
294 | void operator delete (void *p, size_t s) |
49 | { |
295 | { |
50 | g_slice_free1 (s, p); |
296 | sfree ((char *)p, s); |
51 | } |
297 | } |
52 | |
298 | |
53 | void operator delete[] (void *p, size_t s) |
299 | void operator delete[] (void *p, size_t s) |
54 | { |
300 | { |
55 | g_slice_free1 (s, p); |
301 | sfree ((char *)p, s); |
56 | } |
302 | } |
57 | }; |
303 | }; |
58 | |
304 | |
59 | void *salloc_ (int n) throw (std::bad_alloc); |
305 | // makes dynamically allocated objects zero-initialised |
60 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
306 | struct slice_allocated |
61 | |
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62 | // strictly the same as g_slice_alloc, but never returns 0 |
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63 | template<typename T> |
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64 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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65 | |
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66 | // also copies src into the new area, like "memdup" |
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67 | // if src is 0, clears the memory |
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68 | template<typename T> |
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69 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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70 | |
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71 | // clears the memory |
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72 | template<typename T> |
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73 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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74 | |
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75 | // for symmetry |
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76 | template<typename T> |
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77 | inline void sfree (T *ptr, int n = 1) throw () |
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78 | { |
307 | { |
79 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
308 | void *operator new (size_t s, void *p) |
80 | } |
309 | { |
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310 | return p; |
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311 | } |
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312 | |
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313 | void *operator new (size_t s) |
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314 | { |
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315 | return salloc<char> (s); |
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316 | } |
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317 | |
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318 | void *operator new[] (size_t s) |
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319 | { |
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320 | return salloc<char> (s); |
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321 | } |
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322 | |
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323 | void operator delete (void *p, size_t s) |
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324 | { |
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325 | sfree ((char *)p, s); |
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326 | } |
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327 | |
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328 | void operator delete[] (void *p, size_t s) |
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329 | { |
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330 | sfree ((char *)p, s); |
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331 | } |
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332 | }; |
81 | |
333 | |
82 | // a STL-compatible allocator that uses g_slice |
334 | // a STL-compatible allocator that uses g_slice |
83 | // boy, this is verbose |
335 | // boy, this is verbose |
84 | template<typename Tp> |
336 | template<typename Tp> |
85 | struct slice_allocator |
337 | struct slice_allocator |
… | |
… | |
97 | { |
349 | { |
98 | typedef slice_allocator<U> other; |
350 | typedef slice_allocator<U> other; |
99 | }; |
351 | }; |
100 | |
352 | |
101 | slice_allocator () throw () { } |
353 | slice_allocator () throw () { } |
102 | slice_allocator (const slice_allocator &o) throw () { } |
354 | slice_allocator (const slice_allocator &) throw () { } |
103 | template<typename Tp2> |
355 | template<typename Tp2> |
104 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
356 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
105 | |
357 | |
106 | ~slice_allocator () { } |
358 | ~slice_allocator () { } |
107 | |
359 | |
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… | |
116 | void deallocate (pointer p, size_type n) |
368 | void deallocate (pointer p, size_type n) |
117 | { |
369 | { |
118 | sfree<Tp> (p, n); |
370 | sfree<Tp> (p, n); |
119 | } |
371 | } |
120 | |
372 | |
121 | size_type max_size ()const throw () |
373 | size_type max_size () const throw () |
122 | { |
374 | { |
123 | return size_t (-1) / sizeof (Tp); |
375 | return size_t (-1) / sizeof (Tp); |
124 | } |
376 | } |
125 | |
377 | |
126 | void construct (pointer p, const Tp &val) |
378 | void construct (pointer p, const Tp &val) |
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… | |
131 | void destroy (pointer p) |
383 | void destroy (pointer p) |
132 | { |
384 | { |
133 | p->~Tp (); |
385 | p->~Tp (); |
134 | } |
386 | } |
135 | }; |
387 | }; |
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388 | |
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389 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
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390 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
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391 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
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392 | struct tausworthe_random_generator |
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393 | { |
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394 | // generator |
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395 | uint32_t state [4]; |
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396 | |
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397 | void operator =(const tausworthe_random_generator &src) |
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398 | { |
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399 | state [0] = src.state [0]; |
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400 | state [1] = src.state [1]; |
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401 | state [2] = src.state [2]; |
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402 | state [3] = src.state [3]; |
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403 | } |
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404 | |
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405 | void seed (uint32_t seed); |
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406 | uint32_t next (); |
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407 | |
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408 | // uniform distribution, 0 .. max (0, num - 1) |
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409 | uint32_t operator ()(uint32_t num) |
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410 | { |
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411 | return !is_constant (num) ? get_range (num) // non-constant |
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412 | : num & (num - 1) ? (next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
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413 | : next () & (num - 1); // constant, power-of-two |
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414 | } |
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415 | |
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416 | // return a number within (min .. max) |
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417 | int operator () (int r_min, int r_max) |
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418 | { |
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419 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
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420 | ? r_min + operator ()(r_max - r_min + 1) |
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421 | : get_range (r_min, r_max); |
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422 | } |
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423 | |
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424 | double operator ()() |
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425 | { |
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426 | return this->next () / (double)0xFFFFFFFFU; |
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427 | } |
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428 | |
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429 | protected: |
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430 | uint32_t get_range (uint32_t r_max); |
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431 | int get_range (int r_min, int r_max); |
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432 | }; |
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433 | |
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434 | typedef tausworthe_random_generator rand_gen; |
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435 | |
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436 | extern rand_gen rndm, rmg_rndm; |
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437 | |
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438 | INTERFACE_CLASS (attachable) |
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439 | struct refcnt_base |
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440 | { |
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441 | typedef int refcnt_t; |
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442 | mutable refcnt_t ACC (RW, refcnt); |
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443 | |
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444 | MTH void refcnt_inc () const { ++refcnt; } |
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445 | MTH void refcnt_dec () const { --refcnt; } |
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446 | |
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447 | refcnt_base () : refcnt (0) { } |
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448 | }; |
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449 | |
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450 | // to avoid branches with more advanced compilers |
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451 | extern refcnt_base::refcnt_t refcnt_dummy; |
136 | |
452 | |
137 | template<class T> |
453 | template<class T> |
138 | struct refptr |
454 | struct refptr |
139 | { |
455 | { |
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456 | // p if not null |
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457 | refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; } |
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458 | |
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459 | void refcnt_dec () |
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460 | { |
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461 | if (!is_constant (p)) |
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462 | --*refcnt_ref (); |
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463 | else if (p) |
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464 | --p->refcnt; |
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465 | } |
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466 | |
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467 | void refcnt_inc () |
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468 | { |
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469 | if (!is_constant (p)) |
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470 | ++*refcnt_ref (); |
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471 | else if (p) |
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472 | ++p->refcnt; |
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473 | } |
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474 | |
140 | T *p; |
475 | T *p; |
141 | |
476 | |
142 | refptr () : p(0) { } |
477 | refptr () : p(0) { } |
143 | refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); } |
478 | refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); } |
144 | refptr (T *p) : p(p) { if (p) p->refcnt_inc (); } |
479 | refptr (T *p) : p(p) { refcnt_inc (); } |
145 | ~refptr () { if (p) p->refcnt_dec (); } |
480 | ~refptr () { refcnt_dec (); } |
146 | |
481 | |
147 | const refptr<T> &operator =(T *o) |
482 | const refptr<T> &operator =(T *o) |
148 | { |
483 | { |
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484 | // if decrementing ever destroys we need to reverse the order here |
149 | if (p) p->refcnt_dec (); |
485 | refcnt_dec (); |
150 | p = o; |
486 | p = o; |
151 | if (p) p->refcnt_inc (); |
487 | refcnt_inc (); |
152 | |
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153 | return *this; |
488 | return *this; |
154 | } |
489 | } |
155 | |
490 | |
156 | const refptr<T> &operator =(const refptr<T> o) |
491 | const refptr<T> &operator =(const refptr<T> &o) |
157 | { |
492 | { |
158 | *this = o.p; |
493 | *this = o.p; |
159 | return *this; |
494 | return *this; |
160 | } |
495 | } |
161 | |
496 | |
162 | T &operator * () const { return *p; } |
497 | T &operator * () const { return *p; } |
163 | T *operator ->() const { return p; } |
498 | T *operator ->() const { return p; } |
164 | |
499 | |
165 | operator T *() const { return p; } |
500 | operator T *() const { return p; } |
166 | }; |
501 | }; |
167 | |
502 | |
168 | typedef refptr<maptile> maptile_ptr; |
503 | typedef refptr<maptile> maptile_ptr; |
… | |
… | |
203 | { |
538 | { |
204 | return !strcmp (a, b); |
539 | return !strcmp (a, b); |
205 | } |
540 | } |
206 | }; |
541 | }; |
207 | |
542 | |
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543 | // Mostly the same as std::vector, but insert/erase can reorder |
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544 | // the elements, making append(=insert)/remove O(1) instead of O(n). |
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545 | // |
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546 | // NOTE: only some forms of erase are available |
208 | template<class T> |
547 | template<class T> |
209 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
548 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
210 | { |
549 | { |
211 | typedef typename unordered_vector::iterator iterator; |
550 | typedef typename unordered_vector::iterator iterator; |
212 | |
551 | |
… | |
… | |
222 | { |
561 | { |
223 | erase ((unsigned int )(i - this->begin ())); |
562 | erase ((unsigned int )(i - this->begin ())); |
224 | } |
563 | } |
225 | }; |
564 | }; |
226 | |
565 | |
227 | template<class T, int T::* index> |
566 | // This container blends advantages of linked lists |
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567 | // (efficiency) with vectors (random access) by |
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568 | // by using an unordered vector and storing the vector |
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569 | // index inside the object. |
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570 | // |
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571 | // + memory-efficient on most 64 bit archs |
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572 | // + O(1) insert/remove |
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573 | // + free unique (but varying) id for inserted objects |
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574 | // + cache-friendly iteration |
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575 | // - only works for pointers to structs |
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576 | // |
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577 | // NOTE: only some forms of erase/insert are available |
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578 | typedef int object_vector_index; |
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579 | |
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580 | template<class T, object_vector_index T::*indexmember> |
228 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
581 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
229 | { |
582 | { |
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583 | typedef typename object_vector::iterator iterator; |
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584 | |
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585 | bool contains (const T *obj) const |
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586 | { |
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587 | return obj->*indexmember; |
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588 | } |
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589 | |
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590 | iterator find (const T *obj) |
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591 | { |
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592 | return obj->*indexmember |
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593 | ? this->begin () + obj->*indexmember - 1 |
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594 | : this->end (); |
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595 | } |
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596 | |
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597 | void push_back (T *obj) |
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598 | { |
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599 | std::vector<T *, slice_allocator<T *> >::push_back (obj); |
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600 | obj->*indexmember = this->size (); |
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601 | } |
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602 | |
230 | void insert (T *obj) |
603 | void insert (T *obj) |
231 | { |
604 | { |
232 | assert (!(obj->*index)); |
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233 | push_back (obj); |
605 | push_back (obj); |
234 | obj->*index = this->size (); |
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235 | } |
606 | } |
236 | |
607 | |
237 | void insert (T &obj) |
608 | void insert (T &obj) |
238 | { |
609 | { |
239 | insert (&obj); |
610 | insert (&obj); |
240 | } |
611 | } |
241 | |
612 | |
242 | void erase (T *obj) |
613 | void erase (T *obj) |
243 | { |
614 | { |
244 | assert (obj->*index); |
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245 | int pos = obj->*index; |
615 | unsigned int pos = obj->*indexmember; |
246 | obj->*index = 0; |
616 | obj->*indexmember = 0; |
247 | |
617 | |
248 | if (pos < this->size ()) |
618 | if (pos < this->size ()) |
249 | { |
619 | { |
250 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
620 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
251 | (*this)[pos - 1]->*index = pos; |
621 | (*this)[pos - 1]->*indexmember = pos; |
252 | } |
622 | } |
253 | |
623 | |
254 | this->pop_back (); |
624 | this->pop_back (); |
255 | } |
625 | } |
256 | |
626 | |
257 | void erase (T &obj) |
627 | void erase (T &obj) |
258 | { |
628 | { |
259 | errase (&obj); |
629 | erase (&obj); |
260 | } |
630 | } |
261 | }; |
631 | }; |
262 | |
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263 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
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264 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
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265 | template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; } |
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266 | |
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267 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
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268 | |
632 | |
269 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
633 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
270 | void assign (char *dst, const char *src, int maxlen); |
634 | void assign (char *dst, const char *src, int maxlen); |
271 | |
635 | |
272 | // type-safe version of assign |
636 | // type-safe version of assign |
… | |
… | |
276 | assign ((char *)&dst, src, N); |
640 | assign ((char *)&dst, src, N); |
277 | } |
641 | } |
278 | |
642 | |
279 | typedef double tstamp; |
643 | typedef double tstamp; |
280 | |
644 | |
281 | // return current time as timestampe |
645 | // return current time as timestamp |
282 | tstamp now (); |
646 | tstamp now (); |
283 | |
647 | |
284 | int similar_direction (int a, int b); |
648 | int similar_direction (int a, int b); |
285 | |
649 | |
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650 | // like sprintf, but returns a "static" buffer |
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651 | const char *format (const char *format, ...); |
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652 | |
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653 | ///////////////////////////////////////////////////////////////////////////// |
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654 | // threads, very very thin wrappers around pthreads |
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655 | |
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656 | struct thread |
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657 | { |
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658 | pthread_t id; |
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659 | |
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660 | void start (void *(*start_routine)(void *), void *arg = 0); |
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661 | |
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662 | void cancel () |
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663 | { |
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664 | pthread_cancel (id); |
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665 | } |
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666 | |
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667 | void *join () |
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668 | { |
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669 | void *ret; |
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670 | |
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671 | if (pthread_join (id, &ret)) |
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672 | cleanup ("pthread_join failed", 1); |
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673 | |
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674 | return ret; |
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675 | } |
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676 | }; |
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677 | |
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678 | // note that mutexes are not classes |
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679 | typedef pthread_mutex_t smutex; |
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680 | |
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681 | #if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP) |
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682 | #define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP |
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683 | #else |
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684 | #define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER |
286 | #endif |
685 | #endif |
287 | |
686 | |
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687 | #define SMUTEX(name) smutex name = SMUTEX_INITIALISER |
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688 | #define SMUTEX_LOCK(name) pthread_mutex_lock (&(name)) |
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689 | #define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name)) |
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690 | |
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691 | typedef pthread_cond_t scond; |
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692 | |
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693 | #define SCOND(name) scond name = PTHREAD_COND_INITIALIZER |
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694 | #define SCOND_SIGNAL(name) pthread_cond_signal (&(name)) |
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695 | #define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name)) |
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696 | #define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex)) |
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697 | |
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698 | #endif |
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699 | |