| 1 | /* |
1 | /* |
| 2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
| 3 | * |
3 | * |
| 4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
4 | * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
| 5 | * |
5 | * |
| 6 | * Deliantra is free software: you can redistribute it and/or modify |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
| 7 | * it under the terms of the GNU General Public License as published by |
7 | * the terms of the Affero GNU General Public License as published by the |
| 8 | * the Free Software Foundation, either version 3 of the License, or |
8 | * Free Software Foundation, either version 3 of the License, or (at your |
| 9 | * (at your option) any later version. |
9 | * option) any later version. |
| 10 | * |
10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
14 | * GNU General Public License for more details. |
| 15 | * |
15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
16 | * You should have received a copy of the Affero GNU General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
17 | * and the GNU General Public License along with this program. If not, see |
|
|
18 | * <http://www.gnu.org/licenses/>. |
| 18 | * |
19 | * |
| 19 | * The authors can be reached via e-mail to <support@deliantra.net> |
20 | * The authors can be reached via e-mail to <support@deliantra.net> |
| 20 | */ |
21 | */ |
| 21 | |
22 | |
| 22 | #ifndef UTIL_H__ |
23 | #ifndef UTIL_H__ |
| 23 | #define UTIL_H__ |
24 | #define UTIL_H__ |
| 24 | |
25 | |
| 25 | //#define PREFER_MALLOC |
26 | #include <compiler.h> |
| 26 | #define DEBUG_SALLOC |
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|
| 27 | |
27 | |
| 28 | #if __GNUC__ >= 3 |
28 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
| 29 | # define is_constant(c) __builtin_constant_p (c) |
29 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
| 30 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
30 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
| 31 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
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|
| 32 | #else |
|
|
| 33 | # define is_constant(c) 0 |
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|
| 34 | # define expect(expr,value) (expr) |
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| 35 | # define prefetch(addr,rw,locality) |
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|
| 36 | #endif |
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| 37 | |
31 | |
| 38 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
32 | #include <pthread.h> |
| 39 | # define decltype(x) typeof(x) |
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|
| 40 | #endif |
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| 41 | |
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| 42 | // put into ifs if you are very sure that the expression |
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|
| 43 | // is mostly true or mosty false. note that these return |
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|
| 44 | // booleans, not the expression. |
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|
| 45 | #define expect_false(expr) expect ((expr) != 0, 0) |
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|
| 46 | #define expect_true(expr) expect ((expr) != 0, 1) |
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|
| 47 | |
33 | |
| 48 | #include <cstddef> |
34 | #include <cstddef> |
| 49 | #include <cmath> |
35 | #include <cmath> |
| 50 | #include <new> |
36 | #include <new> |
| 51 | #include <vector> |
37 | #include <vector> |
| … | |
… | |
| 53 | #include <glib.h> |
39 | #include <glib.h> |
| 54 | |
40 | |
| 55 | #include <shstr.h> |
41 | #include <shstr.h> |
| 56 | #include <traits.h> |
42 | #include <traits.h> |
| 57 | |
43 | |
| 58 | #ifdef DEBUG_SALLOC |
44 | #if DEBUG_SALLOC |
| 59 | # define g_slice_alloc0(s) debug_slice_alloc0(s) |
45 | # define g_slice_alloc0(s) debug_slice_alloc0(s) |
| 60 | # define g_slice_alloc(s) debug_slice_alloc(s) |
46 | # define g_slice_alloc(s) debug_slice_alloc(s) |
| 61 | # define g_slice_free1(s,p) debug_slice_free1(s,p) |
47 | # define g_slice_free1(s,p) debug_slice_free1(s,p) |
| 62 | void *g_slice_alloc (unsigned long size); |
48 | void *g_slice_alloc (unsigned long size); |
| 63 | void *g_slice_alloc0 (unsigned long size); |
49 | void *g_slice_alloc0 (unsigned long size); |
| 64 | void g_slice_free1 (unsigned long size, void *ptr); |
50 | void g_slice_free1 (unsigned long size, void *ptr); |
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|
51 | #elif PREFER_MALLOC |
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52 | # define g_slice_alloc0(s) calloc (1, (s)) |
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53 | # define g_slice_alloc(s) malloc ((s)) |
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54 | # define g_slice_free1(s,p) free ((p)) |
| 65 | #endif |
55 | #endif |
| 66 | |
56 | |
| 67 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
57 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
| 68 | #define auto(var,expr) decltype(expr) var = (expr) |
58 | #define auto(var,expr) decltype(expr) var = (expr) |
| 69 | |
59 | |
| 70 | // very ugly macro that basicaly declares and initialises a variable |
60 | // very ugly macro that basically declares and initialises a variable |
| 71 | // that is in scope for the next statement only |
61 | // that is in scope for the next statement only |
| 72 | // works only for stuff that can be assigned 0 and converts to false |
62 | // works only for stuff that can be assigned 0 and converts to false |
| 73 | // (note: works great for pointers) |
63 | // (note: works great for pointers) |
| 74 | // most ugly macro I ever wrote |
64 | // most ugly macro I ever wrote |
| 75 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
65 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
| … | |
… | |
| 80 | |
70 | |
| 81 | // in range excluding end |
71 | // in range excluding end |
| 82 | #define IN_RANGE_EXC(val,beg,end) \ |
72 | #define IN_RANGE_EXC(val,beg,end) \ |
| 83 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
73 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
| 84 | |
74 | |
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75 | void cleanup (const char *cause, bool make_core = false); |
| 85 | void fork_abort (const char *msg); |
76 | void fork_abort (const char *msg); |
| 86 | |
77 | |
| 87 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
78 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
| 88 | // as a is often a constant while b is the variable. it is still a bug, though. |
79 | // as a is often a constant while b is the variable. it is still a bug, though. |
| 89 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
80 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
| 90 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
81 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
| 91 | 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; } |
82 | 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; } |
| 92 | |
83 | |
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84 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
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85 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
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86 | 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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87 | |
| 93 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
88 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
| 94 | |
89 | |
| 95 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
90 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
| 96 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
91 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
| 97 | |
92 | |
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93 | // sign returns -1 or +1 |
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94 | template<typename T> |
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95 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
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96 | // relies on 2c representation |
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97 | template<> |
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98 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
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99 | |
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100 | // sign0 returns -1, 0 or +1 |
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101 | template<typename T> |
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102 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
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103 | |
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104 | // div* only work correctly for div > 0 |
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105 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
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106 | template<typename T> static inline T div (T val, T div) |
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107 | { |
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108 | return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div; |
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109 | } |
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110 | // div, round-up |
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111 | template<typename T> static inline T div_ru (T val, T div) |
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112 | { |
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113 | return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div; |
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114 | } |
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115 | // div, round-down |
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116 | template<typename T> static inline T div_rd (T val, T div) |
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117 | { |
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118 | return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div; |
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119 | } |
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120 | |
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121 | // lerp* only work correctly for min_in < max_in |
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122 | // Linear intERPolate, scales val from min_in..max_in to min_out..max_out |
| 98 | template<typename T> |
123 | template<typename T> |
| 99 | static inline T |
124 | static inline T |
| 100 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
125 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
| 101 | { |
126 | { |
| 102 | return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out; |
127 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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128 | } |
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129 | |
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130 | // lerp, round-down |
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131 | template<typename T> |
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132 | static inline T |
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133 | lerp_rd (T val, T min_in, T max_in, T min_out, T max_out) |
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134 | { |
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135 | return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
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136 | } |
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137 | |
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138 | // lerp, round-up |
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139 | template<typename T> |
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140 | static inline T |
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141 | lerp_ru (T val, T min_in, T max_in, T min_out, T max_out) |
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142 | { |
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143 | return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
| 103 | } |
144 | } |
| 104 | |
145 | |
| 105 | // lots of stuff taken from FXT |
146 | // lots of stuff taken from FXT |
| 106 | |
147 | |
| 107 | /* Rotate right. This is used in various places for checksumming */ |
148 | /* Rotate right. This is used in various places for checksumming */ |
| … | |
… | |
| 145 | int32_t d = b - a; |
186 | int32_t d = b - a; |
| 146 | d &= d >> 31; |
187 | d &= d >> 31; |
| 147 | return b - d; |
188 | return b - d; |
| 148 | } |
189 | } |
| 149 | |
190 | |
| 150 | // this is much faster than crossfires original algorithm |
191 | // this is much faster than crossfire's original algorithm |
| 151 | // on modern cpus |
192 | // on modern cpus |
| 152 | inline int |
193 | inline int |
| 153 | isqrt (int n) |
194 | isqrt (int n) |
| 154 | { |
195 | { |
| 155 | return (int)sqrtf ((float)n); |
196 | return (int)sqrtf ((float)n); |
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197 | } |
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198 | |
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199 | // this is kind of like the ^^ operator, if it would exist, without sequence point. |
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200 | // more handy than it looks like, due to the implicit !! done on its arguments |
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201 | inline bool |
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202 | logical_xor (bool a, bool b) |
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203 | { |
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204 | return a != b; |
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205 | } |
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206 | |
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207 | inline bool |
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208 | logical_implies (bool a, bool b) |
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209 | { |
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210 | return a <= b; |
| 156 | } |
211 | } |
| 157 | |
212 | |
| 158 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
213 | // this is only twice as fast as naive sqrtf (dx*dy+dy*dy) |
| 159 | #if 0 |
214 | #if 0 |
| 160 | // and has a max. error of 6 in the range -100..+100. |
215 | // and has a max. error of 6 in the range -100..+100. |
| … | |
… | |
| 185 | absdir (int d) |
240 | absdir (int d) |
| 186 | { |
241 | { |
| 187 | return ((d - 1) & 7) + 1; |
242 | return ((d - 1) & 7) + 1; |
| 188 | } |
243 | } |
| 189 | |
244 | |
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245 | // avoid ctz name because netbsd or freebsd spams it's namespace with it |
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246 | #if GCC_VERSION(3,4) |
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247 | static inline int least_significant_bit (uint32_t x) |
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248 | { |
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249 | return __builtin_ctz (x); |
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250 | } |
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251 | #else |
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252 | int least_significant_bit (uint32_t x); |
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253 | #endif |
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254 | |
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255 | #define for_all_bits_sparse_32(mask, idxvar) \ |
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256 | for (uint32_t idxvar, mask_ = mask; \ |
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257 | mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);) |
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258 | |
| 190 | extern size_t slice_alloc; // statistics |
259 | extern ssize_t slice_alloc; // statistics |
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260 | |
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261 | void *salloc_ (int n) throw (std::bad_alloc); |
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262 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
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263 | |
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264 | // strictly the same as g_slice_alloc, but never returns 0 |
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265 | template<typename T> |
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266 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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267 | |
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268 | // also copies src into the new area, like "memdup" |
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269 | // if src is 0, clears the memory |
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270 | template<typename T> |
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271 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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272 | |
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273 | // clears the memory |
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274 | template<typename T> |
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275 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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276 | |
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277 | // for symmetry |
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278 | template<typename T> |
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279 | inline void sfree (T *ptr, int n = 1) throw () |
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280 | { |
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281 | if (expect_true (ptr)) |
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282 | { |
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283 | slice_alloc -= n * sizeof (T); |
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284 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
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285 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
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286 | assert (slice_alloc >= 0);//D |
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287 | } |
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288 | } |
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289 | |
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290 | // nulls the pointer |
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291 | template<typename T> |
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292 | inline void sfree0 (T *&ptr, int n = 1) throw () |
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293 | { |
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294 | sfree<T> (ptr, n); |
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295 | ptr = 0; |
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296 | } |
| 191 | |
297 | |
| 192 | // makes dynamically allocated objects zero-initialised |
298 | // makes dynamically allocated objects zero-initialised |
| 193 | struct zero_initialised |
299 | struct zero_initialised |
| 194 | { |
300 | { |
| 195 | void *operator new (size_t s, void *p) |
301 | void *operator new (size_t s, void *p) |
| … | |
… | |
| 198 | return p; |
304 | return p; |
| 199 | } |
305 | } |
| 200 | |
306 | |
| 201 | void *operator new (size_t s) |
307 | void *operator new (size_t s) |
| 202 | { |
308 | { |
| 203 | slice_alloc += s; |
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| 204 | return g_slice_alloc0 (s); |
309 | return salloc0<char> (s); |
| 205 | } |
310 | } |
| 206 | |
311 | |
| 207 | void *operator new[] (size_t s) |
312 | void *operator new[] (size_t s) |
| 208 | { |
313 | { |
| 209 | slice_alloc += s; |
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| 210 | return g_slice_alloc0 (s); |
314 | return salloc0<char> (s); |
| 211 | } |
315 | } |
| 212 | |
316 | |
| 213 | void operator delete (void *p, size_t s) |
317 | void operator delete (void *p, size_t s) |
| 214 | { |
318 | { |
| 215 | slice_alloc -= s; |
319 | sfree ((char *)p, s); |
| 216 | g_slice_free1 (s, p); |
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| 217 | } |
320 | } |
| 218 | |
321 | |
| 219 | void operator delete[] (void *p, size_t s) |
322 | void operator delete[] (void *p, size_t s) |
| 220 | { |
323 | { |
| 221 | slice_alloc -= s; |
324 | sfree ((char *)p, s); |
| 222 | g_slice_free1 (s, p); |
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| 223 | } |
325 | } |
| 224 | }; |
326 | }; |
| 225 | |
327 | |
| 226 | void *salloc_ (int n) throw (std::bad_alloc); |
328 | // makes dynamically allocated objects zero-initialised |
| 227 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
329 | struct slice_allocated |
| 228 | |
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| 229 | // strictly the same as g_slice_alloc, but never returns 0 |
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| 230 | template<typename T> |
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| 231 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
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| 232 | |
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| 233 | // also copies src into the new area, like "memdup" |
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| 234 | // if src is 0, clears the memory |
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| 235 | template<typename T> |
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| 236 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
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| 237 | |
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| 238 | // clears the memory |
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| 239 | template<typename T> |
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| 240 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
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| 241 | |
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| 242 | // for symmetry |
|
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| 243 | template<typename T> |
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| 244 | inline void sfree (T *ptr, int n = 1) throw () |
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| 245 | { |
330 | { |
| 246 | #ifdef PREFER_MALLOC |
331 | void *operator new (size_t s, void *p) |
| 247 | free (ptr); |
332 | { |
| 248 | #else |
333 | return p; |
| 249 | slice_alloc -= n * sizeof (T); |
334 | } |
| 250 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
335 | |
| 251 | #endif |
336 | void *operator new (size_t s) |
| 252 | } |
337 | { |
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338 | return salloc<char> (s); |
|
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339 | } |
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340 | |
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341 | void *operator new[] (size_t s) |
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342 | { |
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343 | return salloc<char> (s); |
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344 | } |
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345 | |
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346 | void operator delete (void *p, size_t s) |
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347 | { |
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348 | sfree ((char *)p, s); |
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349 | } |
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350 | |
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351 | void operator delete[] (void *p, size_t s) |
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352 | { |
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353 | sfree ((char *)p, s); |
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354 | } |
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355 | }; |
| 253 | |
356 | |
| 254 | // a STL-compatible allocator that uses g_slice |
357 | // a STL-compatible allocator that uses g_slice |
| 255 | // boy, this is verbose |
358 | // boy, this is verbose |
| 256 | template<typename Tp> |
359 | template<typename Tp> |
| 257 | struct slice_allocator |
360 | struct slice_allocator |
| … | |
… | |
| 309 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
412 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
| 310 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
413 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
| 311 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
414 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
| 312 | struct tausworthe_random_generator |
415 | struct tausworthe_random_generator |
| 313 | { |
416 | { |
| 314 | // generator |
|
|
| 315 | uint32_t state [4]; |
417 | uint32_t state [4]; |
| 316 | |
418 | |
| 317 | void operator =(const tausworthe_random_generator &src) |
419 | void operator =(const tausworthe_random_generator &src) |
| 318 | { |
420 | { |
| 319 | state [0] = src.state [0]; |
421 | state [0] = src.state [0]; |
| … | |
… | |
| 322 | state [3] = src.state [3]; |
424 | state [3] = src.state [3]; |
| 323 | } |
425 | } |
| 324 | |
426 | |
| 325 | void seed (uint32_t seed); |
427 | void seed (uint32_t seed); |
| 326 | uint32_t next (); |
428 | uint32_t next (); |
|
|
429 | }; |
| 327 | |
430 | |
| 328 | // uniform distribution |
431 | // Xorshift RNGs, George Marsaglia |
|
|
432 | // http://www.jstatsoft.org/v08/i14/paper |
|
|
433 | // this one is about 40% faster than the tausworthe one above (i.e. not much), |
|
|
434 | // despite the inlining, and has the issue of only creating 2**32-1 numbers. |
|
|
435 | // see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf |
|
|
436 | struct xorshift_random_generator |
|
|
437 | { |
|
|
438 | uint32_t x, y; |
|
|
439 | |
|
|
440 | void operator =(const xorshift_random_generator &src) |
|
|
441 | { |
|
|
442 | x = src.x; |
|
|
443 | y = src.y; |
|
|
444 | } |
|
|
445 | |
|
|
446 | void seed (uint32_t seed) |
|
|
447 | { |
|
|
448 | x = seed; |
|
|
449 | y = seed * 69069U; |
|
|
450 | } |
|
|
451 | |
|
|
452 | uint32_t next () |
|
|
453 | { |
|
|
454 | uint32_t t = x ^ (x << 10); |
|
|
455 | x = y; |
|
|
456 | y = y ^ (y >> 13) ^ t ^ (t >> 10); |
|
|
457 | return y; |
|
|
458 | } |
|
|
459 | }; |
|
|
460 | |
|
|
461 | template<class generator> |
|
|
462 | struct random_number_generator : generator |
|
|
463 | { |
|
|
464 | // uniform distribution, 0 .. max (0, num - 1) |
| 329 | uint32_t operator ()(uint32_t num) |
465 | uint32_t operator ()(uint32_t num) |
| 330 | { |
466 | { |
| 331 | return is_constant (num) |
467 | return !is_constant (num) ? get_range (num) // non-constant |
| 332 | ? (next () * (uint64_t)num) >> 32U |
468 | : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
| 333 | : get_range (num); |
469 | : this->next () & (num - 1); // constant, power-of-two |
| 334 | } |
470 | } |
| 335 | |
471 | |
| 336 | // return a number within (min .. max) |
472 | // return a number within (min .. max) |
| 337 | int operator () (int r_min, int r_max) |
473 | int operator () (int r_min, int r_max) |
| 338 | { |
474 | { |
| … | |
… | |
| 349 | protected: |
485 | protected: |
| 350 | uint32_t get_range (uint32_t r_max); |
486 | uint32_t get_range (uint32_t r_max); |
| 351 | int get_range (int r_min, int r_max); |
487 | int get_range (int r_min, int r_max); |
| 352 | }; |
488 | }; |
| 353 | |
489 | |
| 354 | typedef tausworthe_random_generator rand_gen; |
490 | typedef random_number_generator<tausworthe_random_generator> rand_gen; |
| 355 | |
491 | |
| 356 | extern rand_gen rndm; |
492 | extern rand_gen rndm, rmg_rndm; |
| 357 | |
493 | |
| 358 | INTERFACE_CLASS (attachable) |
494 | INTERFACE_CLASS (attachable) |
| 359 | struct refcnt_base |
495 | struct refcnt_base |
| 360 | { |
496 | { |
| 361 | typedef int refcnt_t; |
497 | typedef int refcnt_t; |
| … | |
… | |
| 424 | typedef refptr<object> object_ptr; |
560 | typedef refptr<object> object_ptr; |
| 425 | typedef refptr<archetype> arch_ptr; |
561 | typedef refptr<archetype> arch_ptr; |
| 426 | typedef refptr<client> client_ptr; |
562 | typedef refptr<client> client_ptr; |
| 427 | typedef refptr<player> player_ptr; |
563 | typedef refptr<player> player_ptr; |
| 428 | |
564 | |
|
|
565 | #define STRHSH_NULL 2166136261 |
|
|
566 | |
|
|
567 | static inline uint32_t |
|
|
568 | strhsh (const char *s) |
|
|
569 | { |
|
|
570 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
|
|
571 | // it is about twice as fast as the one-at-a-time one, |
|
|
572 | // with good distribution. |
|
|
573 | // FNV-1a is faster on many cpus because the multiplication |
|
|
574 | // runs concurrently with the looping logic. |
|
|
575 | uint32_t hash = STRHSH_NULL; |
|
|
576 | |
|
|
577 | while (*s) |
|
|
578 | hash = (hash ^ *s++) * 16777619; |
|
|
579 | |
|
|
580 | return hash; |
|
|
581 | } |
|
|
582 | |
|
|
583 | static inline uint32_t |
|
|
584 | memhsh (const char *s, size_t len) |
|
|
585 | { |
|
|
586 | uint32_t hash = STRHSH_NULL; |
|
|
587 | |
|
|
588 | while (len--) |
|
|
589 | hash = (hash ^ *s++) * 16777619; |
|
|
590 | |
|
|
591 | return hash; |
|
|
592 | } |
|
|
593 | |
| 429 | struct str_hash |
594 | struct str_hash |
| 430 | { |
595 | { |
| 431 | std::size_t operator ()(const char *s) const |
596 | std::size_t operator ()(const char *s) const |
| 432 | { |
597 | { |
| 433 | unsigned long hash = 0; |
|
|
| 434 | |
|
|
| 435 | /* use the one-at-a-time hash function, which supposedly is |
|
|
| 436 | * better than the djb2-like one used by perl5.005, but |
|
|
| 437 | * certainly is better then the bug used here before. |
|
|
| 438 | * see http://burtleburtle.net/bob/hash/doobs.html |
|
|
| 439 | */ |
|
|
| 440 | while (*s) |
|
|
| 441 | { |
|
|
| 442 | hash += *s++; |
|
|
| 443 | hash += hash << 10; |
|
|
| 444 | hash ^= hash >> 6; |
|
|
| 445 | } |
|
|
| 446 | |
|
|
| 447 | hash += hash << 3; |
|
|
| 448 | hash ^= hash >> 11; |
|
|
| 449 | hash += hash << 15; |
|
|
| 450 | |
|
|
| 451 | return hash; |
598 | return strhsh (s); |
|
|
599 | } |
|
|
600 | |
|
|
601 | std::size_t operator ()(const shstr &s) const |
|
|
602 | { |
|
|
603 | return strhsh (s); |
| 452 | } |
604 | } |
| 453 | }; |
605 | }; |
| 454 | |
606 | |
| 455 | struct str_equal |
607 | struct str_equal |
| 456 | { |
608 | { |
| … | |
… | |
| 549 | erase (&obj); |
701 | erase (&obj); |
| 550 | } |
702 | } |
| 551 | }; |
703 | }; |
| 552 | |
704 | |
| 553 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
705 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
|
|
706 | // returns the number of bytes actually used (including \0) |
| 554 | void assign (char *dst, const char *src, int maxlen); |
707 | int assign (char *dst, const char *src, int maxsize); |
| 555 | |
708 | |
| 556 | // type-safe version of assign |
709 | // type-safe version of assign |
| 557 | template<int N> |
710 | template<int N> |
| 558 | inline void assign (char (&dst)[N], const char *src) |
711 | inline int assign (char (&dst)[N], const char *src) |
| 559 | { |
712 | { |
| 560 | assign ((char *)&dst, src, N); |
713 | return assign ((char *)&dst, src, N); |
| 561 | } |
714 | } |
| 562 | |
715 | |
| 563 | typedef double tstamp; |
716 | typedef double tstamp; |
| 564 | |
717 | |
| 565 | // return current time as timestamp |
718 | // return current time as timestamp |
| 566 | tstamp now (); |
719 | tstamp now (); |
| 567 | |
720 | |
| 568 | int similar_direction (int a, int b); |
721 | int similar_direction (int a, int b); |
| 569 | |
722 | |
| 570 | // like sprintf, but returns a "static" buffer |
723 | // like v?sprintf, but returns a "static" buffer |
| 571 | const char *format (const char *format, ...); |
724 | char *vformat (const char *format, va_list ap); |
|
|
725 | char *format (const char *format, ...) attribute ((format (printf, 1, 2))); |
| 572 | |
726 | |
|
|
727 | // safety-check player input which will become object->msg |
|
|
728 | bool msg_is_safe (const char *msg); |
|
|
729 | |
|
|
730 | ///////////////////////////////////////////////////////////////////////////// |
|
|
731 | // threads, very very thin wrappers around pthreads |
|
|
732 | |
|
|
733 | struct thread |
|
|
734 | { |
|
|
735 | pthread_t id; |
|
|
736 | |
|
|
737 | void start (void *(*start_routine)(void *), void *arg = 0); |
|
|
738 | |
|
|
739 | void cancel () |
|
|
740 | { |
|
|
741 | pthread_cancel (id); |
|
|
742 | } |
|
|
743 | |
|
|
744 | void *join () |
|
|
745 | { |
|
|
746 | void *ret; |
|
|
747 | |
|
|
748 | if (pthread_join (id, &ret)) |
|
|
749 | cleanup ("pthread_join failed", 1); |
|
|
750 | |
|
|
751 | return ret; |
|
|
752 | } |
|
|
753 | }; |
|
|
754 | |
|
|
755 | // note that mutexes are not classes |
|
|
756 | typedef pthread_mutex_t smutex; |
|
|
757 | |
|
|
758 | #if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP) |
|
|
759 | #define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP |
|
|
760 | #else |
|
|
761 | #define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER |
| 573 | #endif |
762 | #endif |
| 574 | |
763 | |
|
|
764 | #define SMUTEX(name) smutex name = SMUTEX_INITIALISER |
|
|
765 | #define SMUTEX_LOCK(name) pthread_mutex_lock (&(name)) |
|
|
766 | #define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name)) |
|
|
767 | |
|
|
768 | typedef pthread_cond_t scond; |
|
|
769 | |
|
|
770 | #define SCOND(name) scond name = PTHREAD_COND_INITIALIZER |
|
|
771 | #define SCOND_SIGNAL(name) pthread_cond_signal (&(name)) |
|
|
772 | #define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name)) |
|
|
773 | #define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex)) |
|
|
774 | |
|
|
775 | #endif |
|
|
776 | |
