[ViewVC] Diff of: cvs/deliantra/server/include/util.h

Comparing deliantra/server/include/util.h (file contents):
Revision 1.54 by root, Mon Aug 6 10:54:12 2007 UTC vs.
Revision 1.128 by root, Tue Nov 27 18:47:35 2018 UTC

…		…
1	/*	1	/*
2	* This file is part of Crossfire TRT, the Roguelike Realtime MORPG.	2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	*	3	*
4	* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team	4	* Copyright (©) 2017,2018 Marc Alexander Lehmann / the Deliantra team
		5	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5	*	6	*
6	* Crossfire TRT is free software: you can redistribute it and/or modify	7	* 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	8	* 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	9	* Free Software Foundation, either version 3 of the License, or (at your
9	* (at your option) any later version.	10	* option) any later version.
10	*	11	*
11	* This program is distributed in the hope that it will be useful,	12	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.	15	* GNU General Public License for more details.
15	*	16	*
16	* You should have received a copy of the GNU General Public License	17	* 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/>.	18	* and the GNU General Public License along with this program. If not, see
		19	* <http://www.gnu.org/licenses/>.
18	*	20	*
19	* The authors can be reached via e-mail to <crossfire@schmorp.de>	21	* The authors can be reached via e-mail to <support@deliantra.net>
20	*/	22	*/
21		23
22	#ifndef UTIL_H__	24	#ifndef UTIL_H__
23	#define UTIL_H__	25	#define UTIL_H__
24		26
25	//#define PREFER_MALLOC	27	#include <compiler.h>
26		28
27	#if __GNUC__ >= 3	29	#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0
28	# define is_constant(c) __builtin_constant_p (c)	30	#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs
29	# define expect(expr,value) __builtin_expect ((expr),(value))	31	#define PREFER_MALLOC 0 // use malloc and not the slice allocator
30	# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
31	#else
32	# define is_constant(c) 0
33	# define expect(expr,value) (expr)
34	# define prefetch(addr,rw,locality)
35	#endif
36		32
37	#if __GNUC__ < 4 \|\| (__GNUC__ == 4 \|\| __GNUC_MINOR__ < 4)	33	#include <pthread.h>
38	# define decltype(x) typeof(x)
39	#endif
40
41	// put into ifs if you are very sure that the expression
42	// is mostly true or mosty false. note that these return
43	// booleans, not the expression.
44	#define expect_false(expr) expect ((expr) != 0, 0)
45	#define expect_true(expr) expect ((expr) != 0, 1)
46		34
47	#include <cstddef>	35	#include <cstddef>
48	#include <cmath>	36	#include <cmath>
49	#include <new>	37	#include <new>
50	#include <vector>	38	#include <vector>
51		39
52	#include <glib.h>	40	#include <glib.h>
53		41
		42	#include <flat_hash_map.hpp>
		43
54	#include <shstr.h>	44	#include <shstr.h>
55	#include <traits.h>	45	#include <traits.h>
56		46
		47	#if DEBUG_SALLOC
		48	# define g_slice_alloc0(s) debug_slice_alloc0(s)
		49	# define g_slice_alloc(s) debug_slice_alloc(s)
		50	# define g_slice_free1(s,p) debug_slice_free1(s,p)
		51	void *g_slice_alloc (unsigned long size);
		52	void *g_slice_alloc0 (unsigned long size);
		53	void g_slice_free1 (unsigned long size, void *ptr);
		54	#elif PREFER_MALLOC
		55	# define g_slice_alloc0(s) calloc (1, (s))
		56	# define g_slice_alloc(s) malloc ((s))
		57	# define g_slice_free1(s,p) free ((p))
		58	#endif
		59
57	// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)	60	// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
58	#define auto(var,expr) decltype(expr) var = (expr)	61	#define auto(var,expr) decltype(expr) var = (expr)
59		62
		63	#if cplusplus_does_not_suck /* still sucks in codesize with gcc 6, although local types work now */
		64	// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
		65	template<typename T, int N>
		66	static inline int array_length (const T (&arr)[N])
		67	{
		68	return N;
		69	}
		70	#else
		71	#define array_length(name) (sizeof (name) / sizeof (name [0]))
		72	#endif
		73
60	// very ugly macro that basicaly declares and initialises a variable	74	// very ugly macro that basically declares and initialises a variable
61	// that is in scope for the next statement only	75	// that is in scope for the next statement only
62	// works only for stuff that can be assigned 0 and converts to false	76	// works only for stuff that can be assigned 0 and converts to false
63	// (note: works great for pointers)	77	// (note: works great for pointers)
64	// most ugly macro I ever wrote	78	// most ugly macro I ever wrote
65	#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)	79	#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
70		84
71	// in range excluding end	85	// in range excluding end
72	#define IN_RANGE_EXC(val,beg,end) \	86	#define IN_RANGE_EXC(val,beg,end) \
73	((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))	87	((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))
74		88
		89	ecb_cold void cleanup (const char *cause, bool make_core = false);
75	void fork_abort (const char *msg);	90	ecb_cold void fork_abort (const char *msg);
76		91
77	// rationale for using (U) not (T) is to reduce signed/unsigned issues,	92	// rationale for using (U) not (T) is to reduce signed/unsigned issues,
78	// as a is often a constant while b is the variable. it is still a bug, though.	93	// as a is often a constant while b is the variable. it is still a bug, though.
79	template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; }	94	template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
80	template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; }	95	template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
81	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; }	96	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		97
		98	template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); }
		99	template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); }
		100	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); }
		101
83	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }	102	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
84		103
		104	template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); }
		105	template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); }
		106
		107	// sign returns -1 or +1
		108	template<typename T>
		109	static inline T sign (T v) { return v < 0 ? -1 : +1; }
		110	// relies on 2c representation
		111	template<>
		112	inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
		113	template<>
		114	inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); }
		115	template<>
		116	inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); }
		117
		118	// sign0 returns -1, 0 or +1
		119	template<typename T>
		120	static inline T sign0 (T v) { return v ? sign (v) : 0; }
		121
		122	//clashes with C++0x
		123	template<typename T, typename U>
		124	static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
		125
		126	// div* only work correctly for div > 0
		127	// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
		128	template<typename T> static inline T div (T val, T div)
		129	{
		130	return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
		131	}
		132
		133	template<> inline float div (float val, float div) { return val / div; }
		134	template<> inline double div (double val, double div) { return val / div; }
		135
		136	// div, round-up
		137	template<typename T> static inline T div_ru (T val, T div)
		138	{
		139	return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
		140	}
		141	// div, round-down
		142	template<typename T> static inline T div_rd (T val, T div)
		143	{
		144	return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div;
		145	}
		146
		147	// lerp* only work correctly for min_in < max_in
		148	// Linear intERPolate, scales val from min_in..max_in to min_out..max_out
85	template<typename T>	149	template<typename T>
86	static inline T	150	static inline T
87	lerp (T val, T min_in, T max_in, T min_out, T max_out)	151	lerp (T val, T min_in, T max_in, T min_out, T max_out)
88	{	152	{
89	return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out;	153	return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		154	}
		155
		156	// lerp, round-down
		157	template<typename T>
		158	static inline T
		159	lerp_rd (T val, T min_in, T max_in, T min_out, T max_out)
		160	{
		161	return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		162	}
		163
		164	// lerp, round-up
		165	template<typename T>
		166	static inline T
		167	lerp_ru (T val, T min_in, T max_in, T min_out, T max_out)
		168	{
		169	return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
90	}	170	}
91		171
92	// lots of stuff taken from FXT	172	// lots of stuff taken from FXT
93		173
94	/* Rotate right. This is used in various places for checksumming */	174	/* Rotate right. This is used in various places for checksumming */
…		…
132	int32_t d = b - a;	212	int32_t d = b - a;
133	d &= d >> 31;	213	d &= d >> 31;
134	return b - d;	214	return b - d;
135	}	215	}
136		216
137	// this is much faster than crossfires original algorithm	217	// this is much faster than crossfire's original algorithm
138	// on modern cpus	218	// on modern cpus
139	inline int	219	inline int
140	isqrt (int n)	220	isqrt (int n)
141	{	221	{
142	return (int)sqrtf ((float)n);	222	return (int)sqrtf ((float)n);
		223	}
		224
		225	// this is kind of like the ^^ operator, if it would exist, without sequence point.
		226	// more handy than it looks like, due to the implicit !! done on its arguments
		227	inline bool
		228	logical_xor (bool a, bool b)
		229	{
		230	return a != b;
		231	}
		232
		233	inline bool
		234	logical_implies (bool a, bool b)
		235	{
		236	return a <= b;
143	}	237	}
144		238
145	// this is only twice as fast as naive sqrtf (dxdy+dydy)	239	// this is only twice as fast as naive sqrtf (dxdy+dydy)
146	#if 0	240	#if 0
147	// and has a max. error of 6 in the range -100..+100.	241	// and has a max. error of 6 in the range -100..+100.
148	#else	242	#else
149	// and has a max. error of 9 in the range -100..+100.	243	// and has a max. error of 9 in the range -100..+100.
150	#endif	244	#endif
151	inline int	245	inline int
152	idistance (int dx, int dy)	246	idistance (int dx, int dy)
153	{	247	{
154	unsigned int dx_ = abs (dx);	248	unsigned int dx_ = abs (dx);
155	unsigned int dy_ = abs (dy);	249	unsigned int dy_ = abs (dy);
156		250
157	#if 0	251	#if 0
158	return dx_ > dy_	252	return dx_ > dy_
…		…
161	#else	255	#else
162	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;	256	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
163	#endif	257	#endif
164	}	258	}
165		259
		260	// can be substantially faster than floor, if your value range allows for it
		261	template<typename T>
		262	inline T
		263	fastfloor (T x)
		264	{
		265	return std::floor (x);
		266	}
		267
		268	inline float
		269	fastfloor (float x)
		270	{
		271	return sint32(x) - (x < 0);
		272	}
		273
		274	inline double
		275	fastfloor (double x)
		276	{
		277	return sint64(x) - (x < 0);
		278	}
		279
166	/*	280	/*
167	* absdir(int): Returns a number between 1 and 8, which represent	281	* absdir(int): Returns a number between 1 and 8, which represent
168	* the "absolute" direction of a number (it actually takes care of	282	* the "absolute" direction of a number (it actually takes care of
169	* "overflow" in previous calculations of a direction).	283	* "overflow" in previous calculations of a direction).
170	*/	284	*/
…		…
172	absdir (int d)	286	absdir (int d)
173	{	287	{
174	return ((d - 1) & 7) + 1;	288	return ((d - 1) & 7) + 1;
175	}	289	}
176		290
		291	#define for_all_bits_sparse_32(mask, idxvar) \
		292	for (uint32_t idxvar, mask_ = mask; \
		293	mask_ && ((idxvar = ecb_ctz32 (mask_)), mask_ &= ~(1 << idxvar), 1);)
		294
		295	extern ssize_t slice_alloc; // statistics
		296
		297	void *salloc_ (int n);
		298	void salloc_ (int n, void src);
		299
		300	// strictly the same as g_slice_alloc, but never returns 0
		301	template<typename T>
		302	inline T salloc (int n = 1) { return (T )salloc_ (n * sizeof (T)); }
		303
		304	// also copies src into the new area, like "memdup"
		305	// if src is 0, clears the memory
		306	template<typename T>
		307	inline T salloc (int n, T src) { return (T )salloc_ (n sizeof (T), (void *)src); }
		308
		309	// clears the memory
		310	template<typename T>
		311	inline T salloc0(int n = 1) { return (T )salloc_ (n * sizeof (T), 0); }
		312
		313	// for symmetry
		314	template<typename T>
		315	inline void sfree (T *ptr, int n = 1) noexcept
		316	{
		317	if (expect_true (ptr))
		318	{
		319	slice_alloc -= n * sizeof (T);
		320	if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
		321	g_slice_free1 (n * sizeof (T), (void *)ptr);
		322	}
		323	}
		324
		325	// nulls the pointer
		326	template<typename T>
		327	inline void sfree0 (T *&ptr, int n = 1) noexcept
		328	{
		329	sfree<T> (ptr, n);
		330	ptr = 0;
		331	}
		332
177	// makes dynamically allocated objects zero-initialised	333	// makes dynamically allocated objects zero-initialised
178	struct zero_initialised	334	struct zero_initialised
179	{	335	{
180	void operator new (size_t s, void p)	336	void operator new (size_t s, void p)
181	{	337	{
…		…
183	return p;	339	return p;
184	}	340	}
185		341
186	void *operator new (size_t s)	342	void *operator new (size_t s)
187	{	343	{
188	return g_slice_alloc0 (s);	344	return salloc0<char> (s);
189	}	345	}
190		346
191	void *operator new[] (size_t s)	347	void *operator new[] (size_t s)
192	{	348	{
193	return g_slice_alloc0 (s);	349	return salloc0<char> (s);
194	}	350	}
195		351
196	void operator delete (void *p, size_t s)	352	void operator delete (void *p, size_t s)
197	{	353	{
198	g_slice_free1 (s, p);	354	sfree ((char *)p, s);
199	}	355	}
200		356
201	void operator delete[] (void *p, size_t s)	357	void operator delete[] (void *p, size_t s)
202	{	358	{
203	g_slice_free1 (s, p);	359	sfree ((char *)p, s);
204	}	360	}
205	};	361	};
206		362
207	void *salloc_ (int n) throw (std::bad_alloc);	363	// makes dynamically allocated objects zero-initialised
208	void salloc_ (int n, void src) throw (std::bad_alloc);	364	struct slice_allocated
209
210	// strictly the same as g_slice_alloc, but never returns 0
211	template<typename T>
212	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
213
214	// also copies src into the new area, like "memdup"
215	// if src is 0, clears the memory
216	template<typename T>
217	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
218
219	// clears the memory
220	template<typename T>
221	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
222
223	// for symmetry
224	template<typename T>
225	inline void sfree (T *ptr, int n = 1) throw ()
226	{	365	{
227	#ifdef PREFER_MALLOC	366	void operator new (size_t s, void p)
228	free (ptr);	367	{
229	#else	368	return p;
230	g_slice_free1 (n * sizeof (T), (void *)ptr);	369	}
231	#endif	370
232	}	371	void *operator new (size_t s)
		372	{
		373	return salloc<char> (s);
		374	}
		375
		376	void *operator new[] (size_t s)
		377	{
		378	return salloc<char> (s);
		379	}
		380
		381	void operator delete (void *p, size_t s)
		382	{
		383	sfree ((char *)p, s);
		384	}
		385
		386	void operator delete[] (void *p, size_t s)
		387	{
		388	sfree ((char *)p, s);
		389	}
		390	};
233		391
234	// a STL-compatible allocator that uses g_slice	392	// a STL-compatible allocator that uses g_slice
235	// boy, this is verbose	393	// boy, this is verbose
236	template<typename Tp>	394	template<typename Tp>
237	struct slice_allocator	395	struct slice_allocator
…		…
242	typedef const Tp *const_pointer;	400	typedef const Tp *const_pointer;
243	typedef Tp &reference;	401	typedef Tp &reference;
244	typedef const Tp &const_reference;	402	typedef const Tp &const_reference;
245	typedef Tp value_type;	403	typedef Tp value_type;
246		404
247	template <class U>	405	template <class U>
248	struct rebind	406	struct rebind
249	{	407	{
250	typedef slice_allocator<U> other;	408	typedef slice_allocator<U> other;
251	};	409	};
252		410
253	slice_allocator () throw () { }	411	slice_allocator () noexcept { }
254	slice_allocator (const slice_allocator &o) throw () { }	412	slice_allocator (const slice_allocator &) noexcept { }
255	template<typename Tp2>	413	template<typename Tp2>
256	slice_allocator (const slice_allocator<Tp2> &) throw () { }	414	slice_allocator (const slice_allocator<Tp2> &) noexcept { }
257		415
258	~slice_allocator () { }	416	~slice_allocator () { }
259		417
260	pointer address (reference x) const { return &x; }	418	pointer address (reference x) const { return &x; }
261	const_pointer address (const_reference x) const { return &x; }	419	const_pointer address (const_reference x) const { return &x; }
…		…
268	void deallocate (pointer p, size_type n)	426	void deallocate (pointer p, size_type n)
269	{	427	{
270	sfree<Tp> (p, n);	428	sfree<Tp> (p, n);
271	}	429	}
272		430
273	size_type max_size ()const throw ()	431	size_type max_size () const noexcept
274	{	432	{
275	return size_t (-1) / sizeof (Tp);	433	return size_t (-1) / sizeof (Tp);
276	}	434	}
277		435
278	void construct (pointer p, const Tp &val)	436	void construct (pointer p, const Tp &val)
…		…
284	{	442	{
285	p->~Tp ();	443	p->~Tp ();
286	}	444	}
287	};	445	};
288		446
289	// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.	447	// basically a memory area, but refcounted
290	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps	448	struct refcnt_buf
291	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
292	struct tausworthe_random_generator
293	{	449	{
294	// generator	450	char *data;
295	uint32_t state [4];
296		451
297	void operator =(const tausworthe_random_generator &src)	452	refcnt_buf (size_t size = 0);
298	{	453	refcnt_buf (void *data, size_t size);
299	state [0] = src.state [0];
300	state [1] = src.state [1];
301	state [2] = src.state [2];
302	state [3] = src.state [3];
303	}
304		454
305	void seed (uint32_t seed);	455	refcnt_buf (const refcnt_buf &src)
306	uint32_t next ();
307
308	// uniform distribution
309	uint32_t operator ()(uint32_t num)
310	{	456	{
311	return is_constant (num)	457	data = src.data;
312	? (next () * (uint64_t)num) >> 32U	458	inc ();
313	: get_range (num);
314	}	459	}
315		460
316	// return a number within (min .. max)	461	~refcnt_buf ();
317	int operator () (int r_min, int r_max)
318	{
319	return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
320	? r_min + operator ()(r_max - r_min + 1)
321	: get_range (r_min, r_max);
322	}
323		462
324	double operator ()()	463	refcnt_buf &operator =(const refcnt_buf &src);
		464
		465	operator char *()
325	{	466	{
326	return this->next () / (double)0xFFFFFFFFU;	467	return data;
		468	}
		469
		470	size_t size () const
		471	{
		472	return _size ();
327	}	473	}
328		474
329	protected:	475	protected:
330	uint32_t get_range (uint32_t r_max);	476	enum {
331	int get_range (int r_min, int r_max);	477	overhead = sizeof (uint32_t) * 2
332	};	478	};
333		479
334	typedef tausworthe_random_generator rand_gen;	480	uint32_t &_size () const
		481	{
		482	return ((unsigned int *)data)[-2];
		483	}
335		484
336	extern rand_gen rndm;	485	uint32_t &_refcnt () const
		486	{
		487	return ((unsigned int *)data)[-1];
		488	}
		489
		490	void _alloc (uint32_t size)
		491	{
		492	data = ((char *)salloc<char> (size + overhead)) + overhead;
		493	_size () = size;
		494	_refcnt () = 1;
		495	}
		496
		497	void _dealloc ();
		498
		499	void inc ()
		500	{
		501	++_refcnt ();
		502	}
		503
		504	void dec ()
		505	{
		506	if (!--_refcnt ())
		507	_dealloc ();
		508	}
		509	};
337		510
338	INTERFACE_CLASS (attachable)	511	INTERFACE_CLASS (attachable)
339	struct refcnt_base	512	struct refcnt_base
340	{	513	{
341	typedef int refcnt_t;	514	typedef int refcnt_t;
…		…
345	MTH void refcnt_dec () const { --refcnt; }	518	MTH void refcnt_dec () const { --refcnt; }
346		519
347	refcnt_base () : refcnt (0) { }	520	refcnt_base () : refcnt (0) { }
348	};	521	};
349		522
		523	// to avoid branches with more advanced compilers
350	extern refcnt_base::refcnt_t refcnt_dummy;	524	extern refcnt_base::refcnt_t refcnt_dummy;
351		525
352	template<class T>	526	template<class T>
353	struct refptr	527	struct refptr
354	{	528	{
355	// p if not null	529	// p if not null
356	refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }	530	refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
357		531
358	void refcnt_dec ()	532	void refcnt_dec ()
359	{	533	{
360	if (!is_constant (p))	534	if (!ecb_is_constant (p))
361	--*refcnt_ref ();	535	--*refcnt_ref ();
362	else if (p)	536	else if (p)
363	--p->refcnt;	537	--p->refcnt;
364	}	538	}
365		539
366	void refcnt_inc ()	540	void refcnt_inc ()
367	{	541	{
368	if (!is_constant (p))	542	if (!ecb_is_constant (p))
369	++*refcnt_ref ();	543	++*refcnt_ref ();
370	else if (p)	544	else if (p)
371	++p->refcnt;	545	++p->refcnt;
372	}	546	}
373		547
…		…
402	typedef refptr<maptile> maptile_ptr;	576	typedef refptr<maptile> maptile_ptr;
403	typedef refptr<object> object_ptr;	577	typedef refptr<object> object_ptr;
404	typedef refptr<archetype> arch_ptr;	578	typedef refptr<archetype> arch_ptr;
405	typedef refptr<client> client_ptr;	579	typedef refptr<client> client_ptr;
406	typedef refptr<player> player_ptr;	580	typedef refptr<player> player_ptr;
		581	typedef refptr<region> region_ptr;
		582
		583	#define STRHSH_NULL 2166136261
		584
		585	static inline uint32_t
		586	strhsh (const char *s)
		587	{
		588	// use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
		589	// it is about twice as fast as the one-at-a-time one,
		590	// with good distribution.
		591	// FNV-1a is faster on many cpus because the multiplication
		592	// runs concurrently with the looping logic.
		593	// we modify the hash a bit to improve its distribution
		594	uint32_t hash = STRHSH_NULL;
		595
		596	while (*s)
		597	hash = (hash ^ s++) 16777619U;
		598
		599	return hash ^ (hash >> 16);
		600	}
		601
		602	static inline uint32_t
		603	memhsh (const char *s, size_t len)
		604	{
		605	uint32_t hash = STRHSH_NULL;
		606
		607	while (len--)
		608	hash = (hash ^ s++) 16777619U;
		609
		610	return hash;
		611	}
407		612
408	struct str_hash	613	struct str_hash
409	{	614	{
410	std::size_t operator ()(const char *s) const	615	std::size_t operator ()(const char *s) const
411	{	616	{
412	unsigned long hash = 0;
413
414	/* use the one-at-a-time hash function, which supposedly is
415	* better than the djb2-like one used by perl5.005, but
416	* certainly is better then the bug used here before.
417	* see http://burtleburtle.net/bob/hash/doobs.html
418	*/
419	while (*s)
420	{
421	hash += *s++;
422	hash += hash << 10;
423	hash ^= hash >> 6;
424	}
425
426	hash += hash << 3;
427	hash ^= hash >> 11;
428	hash += hash << 15;
429
430	return hash;	617	return strhsh (s);
431	}	618	}
		619
		620	std::size_t operator ()(const shstr &s) const
		621	{
		622	return strhsh (s);
		623	}
		624
		625	typedef ska::power_of_two_hash_policy hash_policy;
432	};	626	};
433		627
434	struct str_equal	628	struct str_equal
435	{	629	{
436	bool operator ()(const char a, const char b) const	630	bool operator ()(const char a, const char b) const
…		…
462	}	656	}
463	};	657	};
464		658
465	// This container blends advantages of linked lists	659	// This container blends advantages of linked lists
466	// (efficiency) with vectors (random access) by	660	// (efficiency) with vectors (random access) by
467	// by using an unordered vector and storing the vector	661	// using an unordered vector and storing the vector
468	// index inside the object.	662	// index inside the object.
469	//	663	//
470	// + memory-efficient on most 64 bit archs	664	// + memory-efficient on most 64 bit archs
471	// + O(1) insert/remove	665	// + O(1) insert/remove
472	// + free unique (but varying) id for inserted objects	666	// + free unique (but varying) id for inserted objects
…		…
509	insert (&obj);	703	insert (&obj);
510	}	704	}
511		705
512	void erase (T *obj)	706	void erase (T *obj)
513	{	707	{
514	unsigned int pos = obj->*indexmember;	708	object_vector_index pos = obj->*indexmember;
515	obj->*indexmember = 0;	709	obj->*indexmember = 0;
516		710
517	if (pos < this->size ())	711	if (pos < this->size ())
518	{	712	{
519	(this)[pos - 1] = (this)[this->size () - 1];	713	(this)[pos - 1] = (this)[this->size () - 1];
…		…
527	{	721	{
528	erase (&obj);	722	erase (&obj);
529	}	723	}
530	};	724	};
531		725
		726	/////////////////////////////////////////////////////////////////////////////
		727
		728	// something like a vector or stack, but without
		729	// out of bounds checking
		730	template<typename T>
		731	struct fixed_stack
		732	{
		733	T *data;
		734	int size;
		735	int max;
		736
		737	fixed_stack ()
		738	: size (0), data (0)
		739	{
		740	}
		741
		742	fixed_stack (int max)
		743	: size (0), max (max)
		744	{
		745	data = salloc<T> (max);
		746	}
		747
		748	void reset (int new_max)
		749	{
		750	sfree (data, max);
		751	size = 0;
		752	max = new_max;
		753	data = salloc<T> (max);
		754	}
		755
		756	void free ()
		757	{
		758	sfree (data, max);
		759	data = 0;
		760	}
		761
		762	~fixed_stack ()
		763	{
		764	sfree (data, max);
		765	}
		766
		767	T &operator[](int idx)
		768	{
		769	return data [idx];
		770	}
		771
		772	void push (T v)
		773	{
		774	data [size++] = v;
		775	}
		776
		777	T &pop ()
		778	{
		779	return data [--size];
		780	}
		781
		782	T remove (int idx)
		783	{
		784	T v = data [idx];
		785
		786	data [idx] = data [--size];
		787
		788	return v;
		789	}
		790	};
		791
		792	/////////////////////////////////////////////////////////////////////////////
		793
532	// basically does what strncpy should do, but appends "..." to strings exceeding length	794	// basically does what strncpy should do, but appends "..." to strings exceeding length
		795	// returns the number of bytes actually used (including \0)
533	void assign (char dst, const char src, int maxlen);	796	int assign (char dst, const char src, int maxsize);
534		797
535	// type-safe version of assign	798	// type-safe version of assign
536	template<int N>	799	template<int N>
537	inline void assign (char (&dst)[N], const char *src)	800	inline int assign (char (&dst)[N], const char *src)
538	{	801	{
539	assign ((char *)&dst, src, N);	802	return assign ((char *)&dst, src, N);
540	}	803	}
541		804
542	typedef double tstamp;	805	typedef double tstamp;
543		806
544	// return current time as timestampe	807	// return current time as timestamp
545	tstamp now ();	808	tstamp now ();
546		809
547	int similar_direction (int a, int b);	810	int similar_direction (int a, int b);
548		811
549	// like printf, but returns a std::string	812	// like v?sprintf, but returns a "static" buffer
550	const std::string format (const char *format, ...);	813	char vformat (const char format, va_list ap);
		814	char format (const char format, ...) ecb_attribute ((format (printf, 1, 2)));
551		815
		816	// safety-check player input which will become object->msg
		817	bool msg_is_safe (const char *msg);
		818
		819	/////////////////////////////////////////////////////////////////////////////
		820	// threads, very very thin wrappers around pthreads
		821
		822	struct thread
		823	{
		824	pthread_t id;
		825
		826	void start (void (start_routine)(void ), void arg = 0);
		827
		828	void cancel ()
		829	{
		830	pthread_cancel (id);
		831	}
		832
		833	void *join ()
		834	{
		835	void *ret;
		836
		837	if (pthread_join (id, &ret))
		838	cleanup ("pthread_join failed", 1);
		839
		840	return ret;
		841	}
		842	};
		843
		844	// note that mutexes are not classes
		845	typedef pthread_mutex_t smutex;
		846
		847	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		848	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		849	#else
		850	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
552	#endif	851	#endif
553		852
		853	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		854	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		855	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		856
		857	typedef pthread_cond_t scond;
		858
		859	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		860	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		861	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		862	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		863
		864	#endif
		865

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing deliantra/server/include/util.h (file contents): Revision 1.54 by root, Mon Aug 6 10:54:12 2007 UTC vs. Revision 1.128 by root, Tue Nov 27 18:47:35 2018 UTC

Diff Legend

Comparing deliantra/server/include/util.h (file contents):
Revision 1.54 by root, Mon Aug 6 10:54:12 2007 UTC vs.
Revision 1.128 by root, Tue Nov 27 18:47:35 2018 UTC