|
|
1 | /* |
|
|
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
|
|
3 | * |
|
|
4 | * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
|
|
5 | * |
|
|
6 | * Deliantra is free software: you can redistribute it and/or modify |
|
|
7 | * it under the terms of the GNU General Public License as published by |
|
|
8 | * the Free Software Foundation, either version 3 of the License, or |
|
|
9 | * (at your option) any later version. |
|
|
10 | * |
|
|
11 | * This program is distributed in the hope that it will be useful, |
|
|
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
|
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|
|
14 | * GNU General Public License for more details. |
|
|
15 | * |
|
|
16 | * You should have received a copy of the GNU General Public License |
|
|
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
|
|
18 | * |
|
|
19 | * The authors can be reached via e-mail to <support@deliantra.net> |
|
|
20 | */ |
|
|
21 | |
1 | #ifndef UTIL_H__ |
22 | #ifndef UTIL_H__ |
2 | #define UTIL_H__ |
23 | #define UTIL_H__ |
3 | |
24 | |
|
|
25 | #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 |
|
|
26 | #define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs |
|
|
27 | #define PREFER_MALLOC 0 // use malloc and not the slice allocator |
|
|
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) |
|
|
31 | # define expect(expr,value) __builtin_expect ((expr),(value)) |
|
|
32 | # define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
|
|
33 | # define noinline __attribute__((__noinline__)) |
6 | #else |
34 | #else |
7 | # define is_constant(c) 0 |
35 | # define is_constant(c) 0 |
|
|
36 | # define expect(expr,value) (expr) |
|
|
37 | # define prefetch(addr,rw,locality) |
|
|
38 | # define noinline |
8 | #endif |
39 | #endif |
|
|
40 | |
|
|
41 | #if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4) |
|
|
42 | # define decltype(x) typeof(x) |
|
|
43 | #endif |
|
|
44 | |
|
|
45 | // put into ifs if you are very sure that the expression |
|
|
46 | // is mostly true or mosty false. note that these return |
|
|
47 | // booleans, not the expression. |
|
|
48 | #define expect_false(expr) expect ((expr) ? 1 : 0, 0) |
|
|
49 | #define expect_true(expr) expect ((expr) ? 1 : 0, 1) |
|
|
50 | |
|
|
51 | #include <pthread.h> |
9 | |
52 | |
10 | #include <cstddef> |
53 | #include <cstddef> |
11 | #include <cmath> |
54 | #include <cmath> |
12 | #include <new> |
55 | #include <new> |
13 | #include <vector> |
56 | #include <vector> |
… | |
… | |
15 | #include <glib.h> |
58 | #include <glib.h> |
16 | |
59 | |
17 | #include <shstr.h> |
60 | #include <shstr.h> |
18 | #include <traits.h> |
61 | #include <traits.h> |
19 | |
62 | |
|
|
63 | #if DEBUG_SALLOC |
|
|
64 | # define g_slice_alloc0(s) debug_slice_alloc0(s) |
|
|
65 | # define g_slice_alloc(s) debug_slice_alloc(s) |
|
|
66 | # define g_slice_free1(s,p) debug_slice_free1(s,p) |
|
|
67 | void *g_slice_alloc (unsigned long size); |
|
|
68 | void *g_slice_alloc0 (unsigned long size); |
|
|
69 | void g_slice_free1 (unsigned long size, void *ptr); |
|
|
70 | #elif PREFER_MALLOC |
|
|
71 | # define g_slice_alloc0(s) calloc (1, (s)) |
|
|
72 | # define g_slice_alloc(s) malloc ((s)) |
|
|
73 | # define g_slice_free1(s,p) free ((p)) |
|
|
74 | #endif |
|
|
75 | |
20 | // use a gcc extension for auto declarations until ISO C++ sanctifies them |
76 | // use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever) |
21 | #define AUTODECL(var,expr) typeof(expr) var = (expr) |
77 | #define auto(var,expr) decltype(expr) var = (expr) |
22 | |
78 | |
23 | // very ugly macro that basicaly declares and initialises a variable |
79 | // very ugly macro that basically declares and initialises a variable |
24 | // that is in scope for the next statement only |
80 | // that is in scope for the next statement only |
25 | // works only for stuff that can be assigned 0 and converts to false |
81 | // works only for stuff that can be assigned 0 and converts to false |
26 | // (note: works great for pointers) |
82 | // (note: works great for pointers) |
27 | // most ugly macro I ever wrote |
83 | // most ugly macro I ever wrote |
28 | #define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
84 | #define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1) |
29 | |
85 | |
30 | // in range including end |
86 | // in range including end |
31 | #define IN_RANGE_INC(val,beg,end) \ |
87 | #define IN_RANGE_INC(val,beg,end) \ |
32 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
88 | ((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg)) |
33 | |
89 | |
34 | // in range excluding end |
90 | // in range excluding end |
35 | #define IN_RANGE_EXC(val,beg,end) \ |
91 | #define IN_RANGE_EXC(val,beg,end) \ |
36 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
92 | ((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg)) |
|
|
93 | |
|
|
94 | void cleanup (const char *cause, bool make_core = false); |
|
|
95 | void fork_abort (const char *msg); |
|
|
96 | |
|
|
97 | // rationale for using (U) not (T) is to reduce signed/unsigned issues, |
|
|
98 | // as a is often a constant while b is the variable. it is still a bug, though. |
|
|
99 | template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; } |
|
|
100 | template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; } |
|
|
101 | 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; } |
|
|
102 | |
|
|
103 | template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); } |
|
|
104 | template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); } |
|
|
105 | 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); } |
|
|
106 | |
|
|
107 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
|
|
108 | |
|
|
109 | template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); } |
|
|
110 | template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); } |
|
|
111 | |
|
|
112 | // sign returns -1 or +1 |
|
|
113 | template<typename T> |
|
|
114 | static inline T sign (T v) { return v < 0 ? -1 : +1; } |
|
|
115 | // relies on 2c representation |
|
|
116 | template<> |
|
|
117 | inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); } |
|
|
118 | |
|
|
119 | // sign0 returns -1, 0 or +1 |
|
|
120 | template<typename T> |
|
|
121 | static inline T sign0 (T v) { return v ? sign (v) : 0; } |
|
|
122 | |
|
|
123 | // div, with correct rounding (< 0.5 downwards, >=0.5 upwards) |
|
|
124 | template<typename T> static inline T div (T val, T div) { return (val + div / 2) / div; } |
|
|
125 | // div, round-up |
|
|
126 | template<typename T> static inline T div_ru (T val, T div) { return (val + div - 1) / div; } |
|
|
127 | // div, round-down |
|
|
128 | template<typename T> static inline T div_rd (T val, T div) { return (val ) / div; } |
|
|
129 | |
|
|
130 | template<typename T> |
|
|
131 | static inline T |
|
|
132 | lerp (T val, T min_in, T max_in, T min_out, T max_out) |
|
|
133 | { |
|
|
134 | return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
|
|
135 | } |
|
|
136 | |
|
|
137 | // lerp, round-down |
|
|
138 | template<typename T> |
|
|
139 | static inline T |
|
|
140 | lerp_rd (T val, T min_in, T max_in, T min_out, T max_out) |
|
|
141 | { |
|
|
142 | return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
|
|
143 | } |
|
|
144 | |
|
|
145 | // lerp, round-up |
|
|
146 | template<typename T> |
|
|
147 | static inline T |
|
|
148 | lerp_ru (T val, T min_in, T max_in, T min_out, T max_out) |
|
|
149 | { |
|
|
150 | return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in); |
|
|
151 | } |
|
|
152 | |
|
|
153 | // lots of stuff taken from FXT |
|
|
154 | |
|
|
155 | /* Rotate right. This is used in various places for checksumming */ |
|
|
156 | //TODO: that sucks, use a better checksum algo |
|
|
157 | static inline uint32_t |
|
|
158 | rotate_right (uint32_t c, uint32_t count = 1) |
|
|
159 | { |
|
|
160 | return (c << (32 - count)) | (c >> count); |
|
|
161 | } |
|
|
162 | |
|
|
163 | static inline uint32_t |
|
|
164 | rotate_left (uint32_t c, uint32_t count = 1) |
|
|
165 | { |
|
|
166 | return (c >> (32 - count)) | (c << count); |
|
|
167 | } |
|
|
168 | |
|
|
169 | // Return abs(a-b) |
|
|
170 | // Both a and b must not have the most significant bit set |
|
|
171 | static inline uint32_t |
|
|
172 | upos_abs_diff (uint32_t a, uint32_t b) |
|
|
173 | { |
|
|
174 | long d1 = b - a; |
|
|
175 | long d2 = (d1 & (d1 >> 31)) << 1; |
|
|
176 | |
|
|
177 | return d1 - d2; // == (b - d) - (a + d); |
|
|
178 | } |
|
|
179 | |
|
|
180 | // Both a and b must not have the most significant bit set |
|
|
181 | static inline uint32_t |
|
|
182 | upos_min (uint32_t a, uint32_t b) |
|
|
183 | { |
|
|
184 | int32_t d = b - a; |
|
|
185 | d &= d >> 31; |
|
|
186 | return a + d; |
|
|
187 | } |
|
|
188 | |
|
|
189 | // Both a and b must not have the most significant bit set |
|
|
190 | static inline uint32_t |
|
|
191 | upos_max (uint32_t a, uint32_t b) |
|
|
192 | { |
|
|
193 | int32_t d = b - a; |
|
|
194 | d &= d >> 31; |
|
|
195 | return b - d; |
|
|
196 | } |
37 | |
197 | |
38 | // this is much faster than crossfires original algorithm |
198 | // this is much faster than crossfires original algorithm |
39 | // on modern cpus |
199 | // on modern cpus |
40 | inline int |
200 | inline int |
41 | isqrt (int n) |
201 | isqrt (int n) |
… | |
… | |
73 | absdir (int d) |
233 | absdir (int d) |
74 | { |
234 | { |
75 | return ((d - 1) & 7) + 1; |
235 | return ((d - 1) & 7) + 1; |
76 | } |
236 | } |
77 | |
237 | |
|
|
238 | extern ssize_t slice_alloc; // statistics |
|
|
239 | |
|
|
240 | void *salloc_ (int n) throw (std::bad_alloc); |
|
|
241 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
|
|
242 | |
|
|
243 | // strictly the same as g_slice_alloc, but never returns 0 |
|
|
244 | template<typename T> |
|
|
245 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
|
|
246 | |
|
|
247 | // also copies src into the new area, like "memdup" |
|
|
248 | // if src is 0, clears the memory |
|
|
249 | template<typename T> |
|
|
250 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
|
|
251 | |
|
|
252 | // clears the memory |
|
|
253 | template<typename T> |
|
|
254 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
|
|
255 | |
|
|
256 | // for symmetry |
|
|
257 | template<typename T> |
|
|
258 | inline void sfree (T *ptr, int n = 1) throw () |
|
|
259 | { |
|
|
260 | if (expect_true (ptr)) |
|
|
261 | { |
|
|
262 | slice_alloc -= n * sizeof (T); |
|
|
263 | if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T)); |
|
|
264 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
|
|
265 | assert (slice_alloc >= 0);//D |
|
|
266 | } |
|
|
267 | } |
|
|
268 | |
|
|
269 | // nulls the pointer |
|
|
270 | template<typename T> |
|
|
271 | inline void sfree0 (T *&ptr, int n = 1) throw () |
|
|
272 | { |
|
|
273 | sfree<T> (ptr, n); |
|
|
274 | ptr = 0; |
|
|
275 | } |
|
|
276 | |
78 | // makes dynamically allocated objects zero-initialised |
277 | // makes dynamically allocated objects zero-initialised |
79 | struct zero_initialised |
278 | struct zero_initialised |
80 | { |
279 | { |
81 | void *operator new (size_t s, void *p) |
280 | void *operator new (size_t s, void *p) |
82 | { |
281 | { |
… | |
… | |
84 | return p; |
283 | return p; |
85 | } |
284 | } |
86 | |
285 | |
87 | void *operator new (size_t s) |
286 | void *operator new (size_t s) |
88 | { |
287 | { |
89 | return g_slice_alloc0 (s); |
288 | return salloc0<char> (s); |
90 | } |
289 | } |
91 | |
290 | |
92 | void *operator new[] (size_t s) |
291 | void *operator new[] (size_t s) |
93 | { |
292 | { |
94 | return g_slice_alloc0 (s); |
293 | return salloc0<char> (s); |
95 | } |
294 | } |
96 | |
295 | |
97 | void operator delete (void *p, size_t s) |
296 | void operator delete (void *p, size_t s) |
98 | { |
297 | { |
99 | g_slice_free1 (s, p); |
298 | sfree ((char *)p, s); |
100 | } |
299 | } |
101 | |
300 | |
102 | void operator delete[] (void *p, size_t s) |
301 | void operator delete[] (void *p, size_t s) |
103 | { |
302 | { |
104 | g_slice_free1 (s, p); |
303 | sfree ((char *)p, s); |
105 | } |
304 | } |
106 | }; |
305 | }; |
107 | |
306 | |
108 | void *salloc_ (int n) throw (std::bad_alloc); |
307 | // makes dynamically allocated objects zero-initialised |
109 | void *salloc_ (int n, void *src) throw (std::bad_alloc); |
308 | struct slice_allocated |
110 | |
|
|
111 | // strictly the same as g_slice_alloc, but never returns 0 |
|
|
112 | template<typename T> |
|
|
113 | inline T *salloc (int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T)); } |
|
|
114 | |
|
|
115 | // also copies src into the new area, like "memdup" |
|
|
116 | // if src is 0, clears the memory |
|
|
117 | template<typename T> |
|
|
118 | inline T *salloc (int n, T *src) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), (void *)src); } |
|
|
119 | |
|
|
120 | // clears the memory |
|
|
121 | template<typename T> |
|
|
122 | inline T *salloc0(int n = 1) throw (std::bad_alloc) { return (T *)salloc_ (n * sizeof (T), 0); } |
|
|
123 | |
|
|
124 | // for symmetry |
|
|
125 | template<typename T> |
|
|
126 | inline void sfree (T *ptr, int n = 1) throw () |
|
|
127 | { |
309 | { |
128 | g_slice_free1 (n * sizeof (T), (void *)ptr); |
310 | void *operator new (size_t s, void *p) |
129 | } |
311 | { |
|
|
312 | return p; |
|
|
313 | } |
|
|
314 | |
|
|
315 | void *operator new (size_t s) |
|
|
316 | { |
|
|
317 | return salloc<char> (s); |
|
|
318 | } |
|
|
319 | |
|
|
320 | void *operator new[] (size_t s) |
|
|
321 | { |
|
|
322 | return salloc<char> (s); |
|
|
323 | } |
|
|
324 | |
|
|
325 | void operator delete (void *p, size_t s) |
|
|
326 | { |
|
|
327 | sfree ((char *)p, s); |
|
|
328 | } |
|
|
329 | |
|
|
330 | void operator delete[] (void *p, size_t s) |
|
|
331 | { |
|
|
332 | sfree ((char *)p, s); |
|
|
333 | } |
|
|
334 | }; |
130 | |
335 | |
131 | // a STL-compatible allocator that uses g_slice |
336 | // a STL-compatible allocator that uses g_slice |
132 | // boy, this is verbose |
337 | // boy, this is verbose |
133 | template<typename Tp> |
338 | template<typename Tp> |
134 | struct slice_allocator |
339 | struct slice_allocator |
… | |
… | |
146 | { |
351 | { |
147 | typedef slice_allocator<U> other; |
352 | typedef slice_allocator<U> other; |
148 | }; |
353 | }; |
149 | |
354 | |
150 | slice_allocator () throw () { } |
355 | slice_allocator () throw () { } |
151 | slice_allocator (const slice_allocator &o) throw () { } |
356 | slice_allocator (const slice_allocator &) throw () { } |
152 | template<typename Tp2> |
357 | template<typename Tp2> |
153 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
358 | slice_allocator (const slice_allocator<Tp2> &) throw () { } |
154 | |
359 | |
155 | ~slice_allocator () { } |
360 | ~slice_allocator () { } |
156 | |
361 | |
… | |
… | |
165 | void deallocate (pointer p, size_type n) |
370 | void deallocate (pointer p, size_type n) |
166 | { |
371 | { |
167 | sfree<Tp> (p, n); |
372 | sfree<Tp> (p, n); |
168 | } |
373 | } |
169 | |
374 | |
170 | size_type max_size ()const throw () |
375 | size_type max_size () const throw () |
171 | { |
376 | { |
172 | return size_t (-1) / sizeof (Tp); |
377 | return size_t (-1) / sizeof (Tp); |
173 | } |
378 | } |
174 | |
379 | |
175 | void construct (pointer p, const Tp &val) |
380 | void construct (pointer p, const Tp &val) |
… | |
… | |
180 | void destroy (pointer p) |
385 | void destroy (pointer p) |
181 | { |
386 | { |
182 | p->~Tp (); |
387 | p->~Tp (); |
183 | } |
388 | } |
184 | }; |
389 | }; |
|
|
390 | |
|
|
391 | // P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213. |
|
|
392 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps |
|
|
393 | // http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps |
|
|
394 | struct tausworthe_random_generator |
|
|
395 | { |
|
|
396 | uint32_t state [4]; |
|
|
397 | |
|
|
398 | void operator =(const tausworthe_random_generator &src) |
|
|
399 | { |
|
|
400 | state [0] = src.state [0]; |
|
|
401 | state [1] = src.state [1]; |
|
|
402 | state [2] = src.state [2]; |
|
|
403 | state [3] = src.state [3]; |
|
|
404 | } |
|
|
405 | |
|
|
406 | void seed (uint32_t seed); |
|
|
407 | uint32_t next (); |
|
|
408 | }; |
|
|
409 | |
|
|
410 | // Xorshift RNGs, George Marsaglia |
|
|
411 | // http://www.jstatsoft.org/v08/i14/paper |
|
|
412 | // this one is about 40% faster than the tausworthe one above (i.e. not much), |
|
|
413 | // despite the inlining, and has the issue of only creating 2**32-1 numbers. |
|
|
414 | // see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf |
|
|
415 | struct xorshift_random_generator |
|
|
416 | { |
|
|
417 | uint32_t x, y; |
|
|
418 | |
|
|
419 | void operator =(const xorshift_random_generator &src) |
|
|
420 | { |
|
|
421 | x = src.x; |
|
|
422 | y = src.y; |
|
|
423 | } |
|
|
424 | |
|
|
425 | void seed (uint32_t seed) |
|
|
426 | { |
|
|
427 | x = seed; |
|
|
428 | y = seed * 69069U; |
|
|
429 | } |
|
|
430 | |
|
|
431 | uint32_t next () |
|
|
432 | { |
|
|
433 | uint32_t t = x ^ (x << 10); |
|
|
434 | x = y; |
|
|
435 | y = y ^ (y >> 13) ^ t ^ (t >> 10); |
|
|
436 | return y; |
|
|
437 | } |
|
|
438 | }; |
|
|
439 | |
|
|
440 | template<class generator> |
|
|
441 | struct random_number_generator : generator |
|
|
442 | { |
|
|
443 | // uniform distribution, 0 .. max (0, num - 1) |
|
|
444 | uint32_t operator ()(uint32_t num) |
|
|
445 | { |
|
|
446 | return !is_constant (num) ? get_range (num) // non-constant |
|
|
447 | : num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two |
|
|
448 | : this->next () & (num - 1); // constant, power-of-two |
|
|
449 | } |
|
|
450 | |
|
|
451 | // return a number within (min .. max) |
|
|
452 | int operator () (int r_min, int r_max) |
|
|
453 | { |
|
|
454 | return is_constant (r_min) && is_constant (r_max) && r_min <= r_max |
|
|
455 | ? r_min + operator ()(r_max - r_min + 1) |
|
|
456 | : get_range (r_min, r_max); |
|
|
457 | } |
|
|
458 | |
|
|
459 | double operator ()() |
|
|
460 | { |
|
|
461 | return this->next () / (double)0xFFFFFFFFU; |
|
|
462 | } |
|
|
463 | |
|
|
464 | protected: |
|
|
465 | uint32_t get_range (uint32_t r_max); |
|
|
466 | int get_range (int r_min, int r_max); |
|
|
467 | }; |
|
|
468 | |
|
|
469 | typedef random_number_generator<tausworthe_random_generator> rand_gen; |
|
|
470 | |
|
|
471 | extern rand_gen rndm, rmg_rndm; |
|
|
472 | |
|
|
473 | INTERFACE_CLASS (attachable) |
|
|
474 | struct refcnt_base |
|
|
475 | { |
|
|
476 | typedef int refcnt_t; |
|
|
477 | mutable refcnt_t ACC (RW, refcnt); |
|
|
478 | |
|
|
479 | MTH void refcnt_inc () const { ++refcnt; } |
|
|
480 | MTH void refcnt_dec () const { --refcnt; } |
|
|
481 | |
|
|
482 | refcnt_base () : refcnt (0) { } |
|
|
483 | }; |
|
|
484 | |
|
|
485 | // to avoid branches with more advanced compilers |
|
|
486 | extern refcnt_base::refcnt_t refcnt_dummy; |
185 | |
487 | |
186 | template<class T> |
488 | template<class T> |
187 | struct refptr |
489 | struct refptr |
188 | { |
490 | { |
|
|
491 | // p if not null |
|
|
492 | refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; } |
|
|
493 | |
|
|
494 | void refcnt_dec () |
|
|
495 | { |
|
|
496 | if (!is_constant (p)) |
|
|
497 | --*refcnt_ref (); |
|
|
498 | else if (p) |
|
|
499 | --p->refcnt; |
|
|
500 | } |
|
|
501 | |
|
|
502 | void refcnt_inc () |
|
|
503 | { |
|
|
504 | if (!is_constant (p)) |
|
|
505 | ++*refcnt_ref (); |
|
|
506 | else if (p) |
|
|
507 | ++p->refcnt; |
|
|
508 | } |
|
|
509 | |
189 | T *p; |
510 | T *p; |
190 | |
511 | |
191 | refptr () : p(0) { } |
512 | refptr () : p(0) { } |
192 | refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); } |
513 | refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); } |
193 | refptr (T *p) : p(p) { if (p) p->refcnt_inc (); } |
514 | refptr (T *p) : p(p) { refcnt_inc (); } |
194 | ~refptr () { if (p) p->refcnt_dec (); } |
515 | ~refptr () { refcnt_dec (); } |
195 | |
516 | |
196 | const refptr<T> &operator =(T *o) |
517 | const refptr<T> &operator =(T *o) |
197 | { |
518 | { |
|
|
519 | // if decrementing ever destroys we need to reverse the order here |
198 | if (p) p->refcnt_dec (); |
520 | refcnt_dec (); |
199 | p = o; |
521 | p = o; |
200 | if (p) p->refcnt_inc (); |
522 | refcnt_inc (); |
201 | |
|
|
202 | return *this; |
523 | return *this; |
203 | } |
524 | } |
204 | |
525 | |
205 | const refptr<T> &operator =(const refptr<T> o) |
526 | const refptr<T> &operator =(const refptr<T> &o) |
206 | { |
527 | { |
207 | *this = o.p; |
528 | *this = o.p; |
208 | return *this; |
529 | return *this; |
209 | } |
530 | } |
210 | |
531 | |
211 | T &operator * () const { return *p; } |
532 | T &operator * () const { return *p; } |
212 | T *operator ->() const { return p; } |
533 | T *operator ->() const { return p; } |
213 | |
534 | |
214 | operator T *() const { return p; } |
535 | operator T *() const { return p; } |
215 | }; |
536 | }; |
216 | |
537 | |
217 | typedef refptr<maptile> maptile_ptr; |
538 | typedef refptr<maptile> maptile_ptr; |
… | |
… | |
222 | |
543 | |
223 | struct str_hash |
544 | struct str_hash |
224 | { |
545 | { |
225 | std::size_t operator ()(const char *s) const |
546 | std::size_t operator ()(const char *s) const |
226 | { |
547 | { |
227 | unsigned long hash = 0; |
548 | #if 0 |
|
|
549 | uint32_t hash = 0; |
228 | |
550 | |
229 | /* use the one-at-a-time hash function, which supposedly is |
551 | /* use the one-at-a-time hash function, which supposedly is |
230 | * better than the djb2-like one used by perl5.005, but |
552 | * better than the djb2-like one used by perl5.005, but |
231 | * certainly is better then the bug used here before. |
553 | * certainly is better then the bug used here before. |
232 | * see http://burtleburtle.net/bob/hash/doobs.html |
554 | * see http://burtleburtle.net/bob/hash/doobs.html |
… | |
… | |
239 | } |
561 | } |
240 | |
562 | |
241 | hash += hash << 3; |
563 | hash += hash << 3; |
242 | hash ^= hash >> 11; |
564 | hash ^= hash >> 11; |
243 | hash += hash << 15; |
565 | hash += hash << 15; |
|
|
566 | #else |
|
|
567 | // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/) |
|
|
568 | // it is about twice as fast as the one-at-a-time one, |
|
|
569 | // with good distribution. |
|
|
570 | // FNV-1a is faster on many cpus because the multiplication |
|
|
571 | // runs concurrent with the looping logic. |
|
|
572 | uint32_t hash = 2166136261; |
|
|
573 | |
|
|
574 | while (*s) |
|
|
575 | hash = (hash ^ *s++) * 16777619; |
|
|
576 | #endif |
244 | |
577 | |
245 | return hash; |
578 | return hash; |
246 | } |
579 | } |
247 | }; |
580 | }; |
248 | |
581 | |
… | |
… | |
252 | { |
585 | { |
253 | return !strcmp (a, b); |
586 | return !strcmp (a, b); |
254 | } |
587 | } |
255 | }; |
588 | }; |
256 | |
589 | |
|
|
590 | // Mostly the same as std::vector, but insert/erase can reorder |
|
|
591 | // the elements, making append(=insert)/remove O(1) instead of O(n). |
|
|
592 | // |
|
|
593 | // NOTE: only some forms of erase are available |
257 | template<class T> |
594 | template<class T> |
258 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
595 | struct unordered_vector : std::vector<T, slice_allocator<T> > |
259 | { |
596 | { |
260 | typedef typename unordered_vector::iterator iterator; |
597 | typedef typename unordered_vector::iterator iterator; |
261 | |
598 | |
… | |
… | |
271 | { |
608 | { |
272 | erase ((unsigned int )(i - this->begin ())); |
609 | erase ((unsigned int )(i - this->begin ())); |
273 | } |
610 | } |
274 | }; |
611 | }; |
275 | |
612 | |
276 | template<class T, int T::* index> |
613 | // This container blends advantages of linked lists |
|
|
614 | // (efficiency) with vectors (random access) by |
|
|
615 | // by using an unordered vector and storing the vector |
|
|
616 | // index inside the object. |
|
|
617 | // |
|
|
618 | // + memory-efficient on most 64 bit archs |
|
|
619 | // + O(1) insert/remove |
|
|
620 | // + free unique (but varying) id for inserted objects |
|
|
621 | // + cache-friendly iteration |
|
|
622 | // - only works for pointers to structs |
|
|
623 | // |
|
|
624 | // NOTE: only some forms of erase/insert are available |
|
|
625 | typedef int object_vector_index; |
|
|
626 | |
|
|
627 | template<class T, object_vector_index T::*indexmember> |
277 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
628 | struct object_vector : std::vector<T *, slice_allocator<T *> > |
278 | { |
629 | { |
|
|
630 | typedef typename object_vector::iterator iterator; |
|
|
631 | |
|
|
632 | bool contains (const T *obj) const |
|
|
633 | { |
|
|
634 | return obj->*indexmember; |
|
|
635 | } |
|
|
636 | |
|
|
637 | iterator find (const T *obj) |
|
|
638 | { |
|
|
639 | return obj->*indexmember |
|
|
640 | ? this->begin () + obj->*indexmember - 1 |
|
|
641 | : this->end (); |
|
|
642 | } |
|
|
643 | |
|
|
644 | void push_back (T *obj) |
|
|
645 | { |
|
|
646 | std::vector<T *, slice_allocator<T *> >::push_back (obj); |
|
|
647 | obj->*indexmember = this->size (); |
|
|
648 | } |
|
|
649 | |
279 | void insert (T *obj) |
650 | void insert (T *obj) |
280 | { |
651 | { |
281 | assert (!(obj->*index)); |
|
|
282 | push_back (obj); |
652 | push_back (obj); |
283 | obj->*index = this->size (); |
|
|
284 | } |
653 | } |
285 | |
654 | |
286 | void insert (T &obj) |
655 | void insert (T &obj) |
287 | { |
656 | { |
288 | insert (&obj); |
657 | insert (&obj); |
289 | } |
658 | } |
290 | |
659 | |
291 | void erase (T *obj) |
660 | void erase (T *obj) |
292 | { |
661 | { |
293 | assert (obj->*index); |
|
|
294 | int pos = obj->*index; |
662 | unsigned int pos = obj->*indexmember; |
295 | obj->*index = 0; |
663 | obj->*indexmember = 0; |
296 | |
664 | |
297 | if (pos < this->size ()) |
665 | if (pos < this->size ()) |
298 | { |
666 | { |
299 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
667 | (*this)[pos - 1] = (*this)[this->size () - 1]; |
300 | (*this)[pos - 1]->*index = pos; |
668 | (*this)[pos - 1]->*indexmember = pos; |
301 | } |
669 | } |
302 | |
670 | |
303 | this->pop_back (); |
671 | this->pop_back (); |
304 | } |
672 | } |
305 | |
673 | |
306 | void erase (T &obj) |
674 | void erase (T &obj) |
307 | { |
675 | { |
308 | errase (&obj); |
676 | erase (&obj); |
309 | } |
677 | } |
310 | }; |
678 | }; |
311 | |
|
|
312 | template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; } |
|
|
313 | template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; } |
|
|
314 | 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; } |
|
|
315 | |
|
|
316 | template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; } |
|
|
317 | |
679 | |
318 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
680 | // basically does what strncpy should do, but appends "..." to strings exceeding length |
|
|
681 | // returns the number of bytes actually used (including \0) |
319 | void assign (char *dst, const char *src, int maxlen); |
682 | int assign (char *dst, const char *src, int maxsize); |
320 | |
683 | |
321 | // type-safe version of assign |
684 | // type-safe version of assign |
322 | template<int N> |
685 | template<int N> |
323 | inline void assign (char (&dst)[N], const char *src) |
686 | inline int assign (char (&dst)[N], const char *src) |
324 | { |
687 | { |
325 | assign ((char *)&dst, src, N); |
688 | return assign ((char *)&dst, src, N); |
326 | } |
689 | } |
327 | |
690 | |
328 | typedef double tstamp; |
691 | typedef double tstamp; |
329 | |
692 | |
330 | // return current time as timestampe |
693 | // return current time as timestamp |
331 | tstamp now (); |
694 | tstamp now (); |
332 | |
695 | |
333 | int similar_direction (int a, int b); |
696 | int similar_direction (int a, int b); |
334 | |
697 | |
|
|
698 | // like sprintf, but returns a "static" buffer |
|
|
699 | const char *format (const char *format, ...); |
|
|
700 | |
|
|
701 | ///////////////////////////////////////////////////////////////////////////// |
|
|
702 | // threads, very very thin wrappers around pthreads |
|
|
703 | |
|
|
704 | struct thread |
|
|
705 | { |
|
|
706 | pthread_t id; |
|
|
707 | |
|
|
708 | void start (void *(*start_routine)(void *), void *arg = 0); |
|
|
709 | |
|
|
710 | void cancel () |
|
|
711 | { |
|
|
712 | pthread_cancel (id); |
|
|
713 | } |
|
|
714 | |
|
|
715 | void *join () |
|
|
716 | { |
|
|
717 | void *ret; |
|
|
718 | |
|
|
719 | if (pthread_join (id, &ret)) |
|
|
720 | cleanup ("pthread_join failed", 1); |
|
|
721 | |
|
|
722 | return ret; |
|
|
723 | } |
|
|
724 | }; |
|
|
725 | |
|
|
726 | // note that mutexes are not classes |
|
|
727 | typedef pthread_mutex_t smutex; |
|
|
728 | |
|
|
729 | #if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP) |
|
|
730 | #define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP |
|
|
731 | #else |
|
|
732 | #define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER |
335 | #endif |
733 | #endif |
336 | |
734 | |
|
|
735 | #define SMUTEX(name) smutex name = SMUTEX_INITIALISER |
|
|
736 | #define SMUTEX_LOCK(name) pthread_mutex_lock (&(name)) |
|
|
737 | #define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name)) |
|
|
738 | |
|
|
739 | typedef pthread_cond_t scond; |
|
|
740 | |
|
|
741 | #define SCOND(name) scond name = PTHREAD_COND_INITIALIZER |
|
|
742 | #define SCOND_SIGNAL(name) pthread_cond_signal (&(name)) |
|
|
743 | #define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name)) |
|
|
744 | #define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex)) |
|
|
745 | |
|
|
746 | #endif |
|
|
747 | |