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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.46 by root, Mon May 28 21:15:56 2007 UTC vs.
Revision 1.129 by root, Sat Dec 1 20:22:13 2018 UTC

…		…
1	/*	1	/*
2	* This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game.	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 it	7	* Deliantra is free software: you can redistribute it and/or modify it under
7	* under the terms of the GNU General Public License as published by the Free	8	* the terms of the Affero GNU General Public License as published by the
8	* Software Foundation; either version 2 of the License, or (at your option)	9	* Free Software Foundation, either version 3 of the License, or (at your
9	* any later version.	10	* option) any later version.
10	*	11	*
11	* This program is distributed in the hope that it will be useful, but	12	* This program is distributed in the hope that it will be useful,
12	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* 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 along	17	* You should have received a copy of the Affero GNU General Public License
17	* with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51	18	* and the GNU General Public License along with this program. If not, see
18	* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA	19	* <http://www.gnu.org/licenses/>.
19	*	20	*
20	* 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>
21	*/	22	*/
22		23
23	#ifndef UTIL_H__	24	#ifndef UTIL_H__
24	#define UTIL_H__	25	#define UTIL_H__
25		26
26	//#define PREFER_MALLOC	27	#include <compiler.h>
27		28
28	#if __GNUC__ >= 3	29	#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0
29	# define is_constant(c) __builtin_constant_p (c)	30	#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs
30	# define expect(expr,value) __builtin_expect ((expr),(value))	31	#define PREFER_MALLOC 0 // use malloc and not the slice allocator
31	# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
32	#else
33	# define is_constant(c) 0
34	# define expect(expr,value) (expr)
35	# define prefetch(addr,rw,locality)
36	#endif
37		32
38	// put into ifs if you are very sure that the expression	33	#include <pthread.h>
39	// is mostly true or mosty false. note that these return
40	// booleans, not the expression.
41	#define expect_false(expr) expect ((expr) != 0, 0)
42	#define expect_true(expr) expect ((expr) != 0, 1)
43		34
44	#include <cstddef>	35	#include <cstddef>
45	#include <cmath>	36	#include <cmath>
46	#include <new>	37	#include <new>
47	#include <vector>	38	#include <vector>
48		39
49	#include <glib.h>	40	#include <glib.h>
50		41
		42	#include <flat_hash_map.hpp>
		43
51	#include <shstr.h>	44	#include <shstr.h>
52	#include <traits.h>	45	#include <traits.h>
53		46
54	// use a gcc extension for auto declarations until ISO C++ sanctifies them	47	#if DEBUG_SALLOC
55	#define auto(var,expr) typeof(expr) var = (expr)	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
56		59
57	// very ugly macro that basicaly declares and initialises a variable	60	// very ugly macro that basically declares and initialises a variable
58	// that is in scope for the next statement only	61	// that is in scope for the next statement only
59	// 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
60	// (note: works great for pointers)	63	// (note: works great for pointers)
61	// most ugly macro I ever wrote	64	// most ugly macro I ever wrote
62	#define declvar(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)
63		66
64	// in range including end	67	// in range including end
65	#define IN_RANGE_INC(val,beg,end) \	68	#define IN_RANGE_INC(val,beg,end) \
66	((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))	69	((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
67		70
68	// in range excluding end	71	// in range excluding end
69	#define IN_RANGE_EXC(val,beg,end) \	72	#define IN_RANGE_EXC(val,beg,end) \
70	((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))
71		74
		75	ecb_cold void cleanup (const char *cause, bool make_core = false);
72	void fork_abort (const char *msg);	76	ecb_cold void fork_abort (const char *msg);
73		77
74	// 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,
75	// 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.
76	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 a < (T)b ? a : (T)b; }
77	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 a > (T)b ? a : (T)b; }
78	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; }
79		83
		84	template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); }
		85	template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); }
		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); }
		87
80	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; }
81		89
		90	template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (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)); }
		92
		93	// sign returns -1 or +1
		94	template<typename T>
		95	static inline T sign (T v) { return v < 0 ? -1 : +1; }
		96	// relies on 2c representation
		97	template<>
		98	inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
		99	template<>
		100	inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); }
		101	template<>
		102	inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); }
		103
		104	// sign0 returns -1, 0 or +1
		105	template<typename T>
		106	static inline T sign0 (T v) { return v ? sign (v) : 0; }
		107
		108	//clashes with C++0x
		109	template<typename T, typename U>
		110	static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
		111
		112	// div* only work correctly for div > 0
		113	// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
		114	template<typename T> static inline T div (T val, T div)
		115	{
		116	return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
		117	}
		118
		119	template<> inline float div (float val, float div) { return val / div; }
		120	template<> inline double div (double val, double div) { return val / div; }
		121
		122	// div, round-up
		123	template<typename T> static inline T div_ru (T val, T div)
		124	{
		125	return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
		126	}
		127	// div, round-down
		128	template<typename T> static inline T div_rd (T val, T div)
		129	{
		130	return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div;
		131	}
		132
		133	// lerp* only work correctly for min_in < max_in
		134	// Linear intERPolate, scales val from min_in..max_in to min_out..max_out
82	template<typename T>	135	template<typename T>
83	static inline T	136	static inline T
84	lerp (T val, T min_in, T max_in, T min_out, T max_out)	137	lerp (T val, T min_in, T max_in, T min_out, T max_out)
85	{	138	{
86	return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out;	139	return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		140	}
		141
		142	// lerp, round-down
		143	template<typename T>
		144	static inline T
		145	lerp_rd (T val, T min_in, T max_in, T min_out, T max_out)
		146	{
		147	return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		148	}
		149
		150	// lerp, round-up
		151	template<typename T>
		152	static inline T
		153	lerp_ru (T val, T min_in, T max_in, T min_out, T max_out)
		154	{
		155	return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
87	}	156	}
88		157
89	// lots of stuff taken from FXT	158	// lots of stuff taken from FXT
90		159
91	/* Rotate right. This is used in various places for checksumming */	160	/* Rotate right. This is used in various places for checksumming */
129	int32_t d = b - a;	198	int32_t d = b - a;
130	d &= d >> 31;	199	d &= d >> 31;
131	return b - d;	200	return b - d;
132	}	201	}
133		202
134	// this is much faster than crossfires original algorithm	203	// this is much faster than crossfire's original algorithm
135	// on modern cpus	204	// on modern cpus
136	inline int	205	inline int
137	isqrt (int n)	206	isqrt (int n)
138	{	207	{
139	return (int)sqrtf ((float)n);	208	return (int)sqrtf ((float)n);
		209	}
		210
		211	// this is kind of like the ^^ operator, if it would exist, without sequence point.
		212	// more handy than it looks like, due to the implicit !! done on its arguments
		213	inline bool
		214	logical_xor (bool a, bool b)
		215	{
		216	return a != b;
		217	}
		218
		219	inline bool
		220	logical_implies (bool a, bool b)
		221	{
		222	return a <= b;
140	}	223	}
141		224
142	// this is only twice as fast as naive sqrtf (dxdy+dydy)	225	// this is only twice as fast as naive sqrtf (dxdy+dydy)
143	#if 0	226	#if 0
144	// and has a max. error of 6 in the range -100..+100.	227	// and has a max. error of 6 in the range -100..+100.
145	#else	228	#else
146	// and has a max. error of 9 in the range -100..+100.	229	// and has a max. error of 9 in the range -100..+100.
147	#endif	230	#endif
148	inline int	231	inline int
149	idistance (int dx, int dy)	232	idistance (int dx, int dy)
150	{	233	{
151	unsigned int dx_ = abs (dx);	234	unsigned int dx_ = abs (dx);
152	unsigned int dy_ = abs (dy);	235	unsigned int dy_ = abs (dy);
153		236
154	#if 0	237	#if 0
155	return dx_ > dy_	238	return dx_ > dy_
…		…
158	#else	241	#else
159	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;	242	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
160	#endif	243	#endif
161	}	244	}
162		245
		246	// can be substantially faster than floor, if your value range allows for it
		247	template<typename T>
		248	inline T
		249	fastfloor (T x)
		250	{
		251	return std::floor (x);
		252	}
		253
		254	inline float
		255	fastfloor (float x)
		256	{
		257	return sint32(x) - (x < 0);
		258	}
		259
		260	inline double
		261	fastfloor (double x)
		262	{
		263	return sint64(x) - (x < 0);
		264	}
		265
163	/*	266	/*
164	* absdir(int): Returns a number between 1 and 8, which represent	267	* absdir(int): Returns a number between 1 and 8, which represent
165	* the "absolute" direction of a number (it actually takes care of	268	* the "absolute" direction of a number (it actually takes care of
166	* "overflow" in previous calculations of a direction).	269	* "overflow" in previous calculations of a direction).
167	*/	270	*/
…		…
169	absdir (int d)	272	absdir (int d)
170	{	273	{
171	return ((d - 1) & 7) + 1;	274	return ((d - 1) & 7) + 1;
172	}	275	}
173		276
		277	#define for_all_bits_sparse_32(mask, idxvar) \
		278	for (uint32_t idxvar, mask_ = mask; \
		279	mask_ && ((idxvar = ecb_ctz32 (mask_)), mask_ &= ~(1 << idxvar), 1);)
		280
		281	extern ssize_t slice_alloc; // statistics
		282
		283	void *salloc_ (int n);
		284	void salloc_ (int n, void src);
		285
		286	// strictly the same as g_slice_alloc, but never returns 0
		287	template<typename T>
		288	inline T salloc (int n = 1) { return (T )salloc_ (n * sizeof (T)); }
		289
		290	// also copies src into the new area, like "memdup"
		291	// if src is 0, clears the memory
		292	template<typename T>
		293	inline T salloc (int n, T src) { return (T )salloc_ (n sizeof (T), (void *)src); }
		294
		295	// clears the memory
		296	template<typename T>
		297	inline T salloc0(int n = 1) { return (T )salloc_ (n * sizeof (T), 0); }
		298
		299	// for symmetry
		300	template<typename T>
		301	inline void sfree (T *ptr, int n = 1) noexcept
		302	{
		303	if (expect_true (ptr))
		304	{
		305	slice_alloc -= n * sizeof (T);
		306	if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
		307	g_slice_free1 (n * sizeof (T), (void *)ptr);
		308	}
		309	}
		310
		311	// nulls the pointer
		312	template<typename T>
		313	inline void sfree0 (T *&ptr, int n = 1) noexcept
		314	{
		315	sfree<T> (ptr, n);
		316	ptr = 0;
		317	}
		318
174	// makes dynamically allocated objects zero-initialised	319	// makes dynamically allocated objects zero-initialised
175	struct zero_initialised	320	struct zero_initialised
176	{	321	{
177	void operator new (size_t s, void p)	322	void operator new (size_t s, void p)
178	{	323	{
…		…
180	return p;	325	return p;
181	}	326	}
182		327
183	void *operator new (size_t s)	328	void *operator new (size_t s)
184	{	329	{
185	return g_slice_alloc0 (s);	330	return salloc0<char> (s);
186	}	331	}
187		332
188	void *operator new[] (size_t s)	333	void *operator new[] (size_t s)
189	{	334	{
190	return g_slice_alloc0 (s);	335	return salloc0<char> (s);
191	}	336	}
192		337
193	void operator delete (void *p, size_t s)	338	void operator delete (void *p, size_t s)
194	{	339	{
195	g_slice_free1 (s, p);	340	sfree ((char *)p, s);
196	}	341	}
197		342
198	void operator delete[] (void *p, size_t s)	343	void operator delete[] (void *p, size_t s)
199	{	344	{
200	g_slice_free1 (s, p);	345	sfree ((char *)p, s);
201	}	346	}
202	};	347	};
203		348
204	void *salloc_ (int n) throw (std::bad_alloc);	349	// makes dynamically allocated objects zero-initialised
205	void salloc_ (int n, void src) throw (std::bad_alloc);	350	struct slice_allocated
206
207	// strictly the same as g_slice_alloc, but never returns 0
208	template<typename T>
209	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
210
211	// also copies src into the new area, like "memdup"
212	// if src is 0, clears the memory
213	template<typename T>
214	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
215
216	// clears the memory
217	template<typename T>
218	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
219
220	// for symmetry
221	template<typename T>
222	inline void sfree (T *ptr, int n = 1) throw ()
223	{	351	{
224	#ifdef PREFER_MALLOC	352	void operator new (size_t s, void p)
225	free (ptr);	353	{
226	#else	354	return p;
227	g_slice_free1 (n * sizeof (T), (void *)ptr);	355	}
228	#endif	356
229	}	357	void *operator new (size_t s)
		358	{
		359	return salloc<char> (s);
		360	}
		361
		362	void *operator new[] (size_t s)
		363	{
		364	return salloc<char> (s);
		365	}
		366
		367	void operator delete (void *p, size_t s)
		368	{
		369	sfree ((char *)p, s);
		370	}
		371
		372	void operator delete[] (void *p, size_t s)
		373	{
		374	sfree ((char *)p, s);
		375	}
		376	};
230		377
231	// a STL-compatible allocator that uses g_slice	378	// a STL-compatible allocator that uses g_slice
232	// boy, this is verbose	379	// boy, this is verbose
233	template<typename Tp>	380	template<typename Tp>
234	struct slice_allocator	381	struct slice_allocator
…		…
239	typedef const Tp *const_pointer;	386	typedef const Tp *const_pointer;
240	typedef Tp &reference;	387	typedef Tp &reference;
241	typedef const Tp &const_reference;	388	typedef const Tp &const_reference;
242	typedef Tp value_type;	389	typedef Tp value_type;
243		390
244	template <class U>	391	template <class U>
245	struct rebind	392	struct rebind
246	{	393	{
247	typedef slice_allocator<U> other;	394	typedef slice_allocator<U> other;
248	};	395	};
249		396
250	slice_allocator () throw () { }	397	slice_allocator () noexcept { }
251	slice_allocator (const slice_allocator &o) throw () { }	398	slice_allocator (const slice_allocator &) noexcept { }
252	template<typename Tp2>	399	template<typename Tp2>
253	slice_allocator (const slice_allocator<Tp2> &) throw () { }	400	slice_allocator (const slice_allocator<Tp2> &) noexcept { }
254		401
255	~slice_allocator () { }	402	~slice_allocator () { }
256		403
257	pointer address (reference x) const { return &x; }	404	pointer address (reference x) const { return &x; }
258	const_pointer address (const_reference x) const { return &x; }	405	const_pointer address (const_reference x) const { return &x; }
…		…
265	void deallocate (pointer p, size_type n)	412	void deallocate (pointer p, size_type n)
266	{	413	{
267	sfree<Tp> (p, n);	414	sfree<Tp> (p, n);
268	}	415	}
269		416
270	size_type max_size ()const throw ()	417	size_type max_size () const noexcept
271	{	418	{
272	return size_t (-1) / sizeof (Tp);	419	return size_t (-1) / sizeof (Tp);
273	}	420	}
274		421
275	void construct (pointer p, const Tp &val)	422	void construct (pointer p, const Tp &val)
…		…
281	{	428	{
282	p->~Tp ();	429	p->~Tp ();
283	}	430	}
284	};	431	};
285		432
286	// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.	433	// basically a memory area, but refcounted
287	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps	434	struct refcnt_buf
288	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
289	struct tausworthe_random_generator
290	{	435	{
291	// generator	436	char *data;
292	uint32_t state [4];
293		437
294	void operator =(const tausworthe_random_generator &src)	438	refcnt_buf (size_t size = 0);
295	{	439	refcnt_buf (void *data, size_t size);
296	state [0] = src.state [0];
297	state [1] = src.state [1];
298	state [2] = src.state [2];
299	state [3] = src.state [3];
300	}
301		440
302	void seed (uint32_t seed);	441	refcnt_buf (const refcnt_buf &src)
303	uint32_t next ();
304
305	// uniform distribution
306	uint32_t operator ()(uint32_t num)
307	{	442	{
308	return is_constant (num)	443	data = src.data;
309	? (next () * (uint64_t)num) >> 32U	444	inc ();
310	: get_range (num);
311	}	445	}
312		446
313	// return a number within (min .. max)	447	~refcnt_buf ();
314	int operator () (int r_min, int r_max)
315	{
316	return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
317	? r_min + operator ()(r_max - r_min + 1)
318	: get_range (r_min, r_max);
319	}
320		448
321	double operator ()()	449	refcnt_buf &operator =(const refcnt_buf &src);
		450
		451	operator char *()
322	{	452	{
323	return this->next () / (double)0xFFFFFFFFU;	453	return data;
		454	}
		455
		456	size_t size () const
		457	{
		458	return _size ();
324	}	459	}
325		460
326	protected:	461	protected:
327	uint32_t get_range (uint32_t r_max);	462	enum {
328	int get_range (int r_min, int r_max);	463	overhead = sizeof (uint32_t) * 2
329	};	464	};
330		465
331	typedef tausworthe_random_generator rand_gen;	466	uint32_t &_size () const
		467	{
		468	return ((unsigned int *)data)[-2];
		469	}
332		470
333	extern rand_gen rndm;	471	uint32_t &_refcnt () const
		472	{
		473	return ((unsigned int *)data)[-1];
		474	}
		475
		476	void _alloc (uint32_t size)
		477	{
		478	data = ((char *)salloc<char> (size + overhead)) + overhead;
		479	_size () = size;
		480	_refcnt () = 1;
		481	}
		482
		483	void _dealloc ();
		484
		485	void inc ()
		486	{
		487	++_refcnt ();
		488	}
		489
		490	void dec ()
		491	{
		492	if (!--_refcnt ())
		493	_dealloc ();
		494	}
		495	};
		496
		497	INTERFACE_CLASS (attachable)
		498	struct refcnt_base
		499	{
		500	typedef int refcnt_t;
		501	mutable refcnt_t ACC (RW, refcnt);
		502
		503	MTH void refcnt_inc () const { ++refcnt; }
		504	MTH void refcnt_dec () const { --refcnt; }
		505
		506	refcnt_base () : refcnt (0) { }
		507	};
		508
		509	// to avoid branches with more advanced compilers
		510	extern refcnt_base::refcnt_t refcnt_dummy;
334		511
335	template<class T>	512	template<class T>
336	struct refptr	513	struct refptr
337	{	514	{
		515	// p if not null
		516	refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
		517
		518	void refcnt_dec ()
		519	{
		520	if (!ecb_is_constant (p))
		521	--*refcnt_ref ();
		522	else if (p)
		523	--p->refcnt;
		524	}
		525
		526	void refcnt_inc ()
		527	{
		528	if (!ecb_is_constant (p))
		529	++*refcnt_ref ();
		530	else if (p)
		531	++p->refcnt;
		532	}
		533
338	T *p;	534	T *p;
339		535
340	refptr () : p(0) { }	536	refptr () : p(0) { }
341	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	537	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
342	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	538	refptr (T *p) : p(p) { refcnt_inc (); }
343	~refptr () { if (p) p->refcnt_dec (); }	539	~refptr () { refcnt_dec (); }
344		540
345	const refptr<T> &operator =(T *o)	541	const refptr<T> &operator =(T *o)
346	{	542	{
		543	// if decrementing ever destroys we need to reverse the order here
347	if (p) p->refcnt_dec ();	544	refcnt_dec ();
348	p = o;	545	p = o;
349	if (p) p->refcnt_inc ();	546	refcnt_inc ();
350
351	return *this;	547	return *this;
352	}	548	}
353		549
354	const refptr<T> &operator =(const refptr<T> o)	550	const refptr<T> &operator =(const refptr<T> &o)
355	{	551	{
356	*this = o.p;	552	*this = o.p;
357	return *this;	553	return *this;
358	}	554	}
359		555
360	T &operator * () const { return *p; }	556	T &operator * () const { return *p; }
361	T *operator ->() const { return p; }	557	T *operator ->() const { return p; }
362		558
363	operator T *() const { return p; }	559	operator T *() const { return p; }
364	};	560	};
365		561
366	typedef refptr<maptile> maptile_ptr;	562	typedef refptr<maptile> maptile_ptr;
367	typedef refptr<object> object_ptr;	563	typedef refptr<object> object_ptr;
368	typedef refptr<archetype> arch_ptr;	564	typedef refptr<archetype> arch_ptr;
369	typedef refptr<client> client_ptr;	565	typedef refptr<client> client_ptr;
370	typedef refptr<player> player_ptr;	566	typedef refptr<player> player_ptr;
		567	typedef refptr<region> region_ptr;
		568
		569	#define STRHSH_NULL 2166136261
		570
		571	static inline uint32_t
		572	strhsh (const char *s)
		573	{
		574	// use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
		575	// it is about twice as fast as the one-at-a-time one,
		576	// with good distribution.
		577	// FNV-1a is faster on many cpus because the multiplication
		578	// runs concurrently with the looping logic.
		579	// we modify the hash a bit to improve its distribution
		580	uint32_t hash = STRHSH_NULL;
		581
		582	while (*s)
		583	hash = (hash ^ s++) 16777619U;
		584
		585	return hash ^ (hash >> 16);
		586	}
		587
		588	static inline uint32_t
		589	memhsh (const char *s, size_t len)
		590	{
		591	uint32_t hash = STRHSH_NULL;
		592
		593	while (len--)
		594	hash = (hash ^ s++) 16777619U;
		595
		596	return hash;
		597	}
371		598
372	struct str_hash	599	struct str_hash
373	{	600	{
374	std::size_t operator ()(const char *s) const	601	std::size_t operator ()(const char *s) const
375	{	602	{
376	unsigned long hash = 0;
377
378	/* use the one-at-a-time hash function, which supposedly is
379	* better than the djb2-like one used by perl5.005, but
380	* certainly is better then the bug used here before.
381	* see http://burtleburtle.net/bob/hash/doobs.html
382	*/
383	while (*s)
384	{
385	hash += *s++;
386	hash += hash << 10;
387	hash ^= hash >> 6;
388	}
389
390	hash += hash << 3;
391	hash ^= hash >> 11;
392	hash += hash << 15;
393
394	return hash;	603	return strhsh (s);
395	}	604	}
		605
		606	std::size_t operator ()(const shstr &s) const
		607	{
		608	return strhsh (s);
		609	}
		610
		611	typedef ska::power_of_two_hash_policy hash_policy;
396	};	612	};
397		613
398	struct str_equal	614	struct str_equal
399	{	615	{
400	bool operator ()(const char a, const char b) const	616	bool operator ()(const char a, const char b) const
401	{	617	{
402	return !strcmp (a, b);	618	return !strcmp (a, b);
403	}	619	}
404	};	620	};
405		621
		622	// Mostly the same as std::vector, but insert/erase can reorder
		623	// the elements, making append(=insert)/remove O(1) instead of O(n).
		624	//
		625	// NOTE: only some forms of erase are available
406	template<class T>	626	template<class T>
407	struct unordered_vector : std::vector<T, slice_allocator<T> >	627	struct unordered_vector : std::vector<T, slice_allocator<T> >
408	{	628	{
409	typedef typename unordered_vector::iterator iterator;	629	typedef typename unordered_vector::iterator iterator;
410		630
…		…
420	{	640	{
421	erase ((unsigned int )(i - this->begin ()));	641	erase ((unsigned int )(i - this->begin ()));
422	}	642	}
423	};	643	};
424		644
425	template<class T, int T::* index>	645	// This container blends advantages of linked lists
		646	// (efficiency) with vectors (random access) by
		647	// using an unordered vector and storing the vector
		648	// index inside the object.
		649	//
		650	// + memory-efficient on most 64 bit archs
		651	// + O(1) insert/remove
		652	// + free unique (but varying) id for inserted objects
		653	// + cache-friendly iteration
		654	// - only works for pointers to structs
		655	//
		656	// NOTE: only some forms of erase/insert are available
		657	typedef int object_vector_index;
		658
		659	template<class T, object_vector_index T::*indexmember>
426	struct object_vector : std::vector<T , slice_allocator<T > >	660	struct object_vector : std::vector<T , slice_allocator<T > >
427	{	661	{
		662	typedef typename object_vector::iterator iterator;
		663
		664	bool contains (const T *obj) const
		665	{
		666	return obj->*indexmember;
		667	}
		668
		669	iterator find (const T *obj)
		670	{
		671	return obj->*indexmember
		672	? this->begin () + obj->*indexmember - 1
		673	: this->end ();
		674	}
		675
		676	void push_back (T *obj)
		677	{
		678	std::vector<T , slice_allocator<T > >::push_back (obj);
		679	obj->*indexmember = this->size ();
		680	}
		681
428	void insert (T *obj)	682	void insert (T *obj)
429	{	683	{
430	assert (!(obj->*index));
431	push_back (obj);	684	push_back (obj);
432	obj->*index = this->size ();
433	}	685	}
434		686
435	void insert (T &obj)	687	void insert (T &obj)
436	{	688	{
437	insert (&obj);	689	insert (&obj);
438	}	690	}
439		691
440	void erase (T *obj)	692	void erase (T *obj)
441	{	693	{
442	assert (obj->*index);	694	object_vector_index pos = obj->*indexmember;
443	unsigned int pos = obj->*index;
444	obj->*index = 0;	695	obj->*indexmember = 0;
445		696
446	if (pos < this->size ())	697	if (pos < this->size ())
447	{	698	{
448	(this)[pos - 1] = (this)[this->size () - 1];	699	(this)[pos - 1] = (this)[this->size () - 1];
449	(this)[pos - 1]->index = pos;	700	(this)[pos - 1]->indexmember = pos;
450	}	701	}
451		702
452	this->pop_back ();	703	this->pop_back ();
453	}	704	}
454		705
455	void erase (T &obj)	706	void erase (T &obj)
456	{	707	{
457	errase (&obj);	708	erase (&obj);
458	}	709	}
459	};	710	};
		711
		712	/////////////////////////////////////////////////////////////////////////////
		713
		714	// something like a vector or stack, but without
		715	// out of bounds checking
		716	template<typename T>
		717	struct fixed_stack
		718	{
		719	T *data;
		720	int size;
		721	int max;
		722
		723	fixed_stack ()
		724	: size (0), data (0)
		725	{
		726	}
		727
		728	fixed_stack (int max)
		729	: size (0), max (max)
		730	{
		731	data = salloc<T> (max);
		732	}
		733
		734	void reset (int new_max)
		735	{
		736	sfree (data, max);
		737	size = 0;
		738	max = new_max;
		739	data = salloc<T> (max);
		740	}
		741
		742	void free ()
		743	{
		744	sfree (data, max);
		745	data = 0;
		746	}
		747
		748	~fixed_stack ()
		749	{
		750	sfree (data, max);
		751	}
		752
		753	T &operator[](int idx)
		754	{
		755	return data [idx];
		756	}
		757
		758	void push (T v)
		759	{
		760	data [size++] = v;
		761	}
		762
		763	T &pop ()
		764	{
		765	return data [--size];
		766	}
		767
		768	T remove (int idx)
		769	{
		770	T v = data [idx];
		771
		772	data [idx] = data [--size];
		773
		774	return v;
		775	}
		776	};
		777
		778	/////////////////////////////////////////////////////////////////////////////
460		779
461	// basically does what strncpy should do, but appends "..." to strings exceeding length	780	// basically does what strncpy should do, but appends "..." to strings exceeding length
		781	// returns the number of bytes actually used (including \0)
462	void assign (char dst, const char src, int maxlen);	782	int assign (char dst, const char src, int maxsize);
463		783
464	// type-safe version of assign	784	// type-safe version of assign
465	template<int N>	785	template<int N>
466	inline void assign (char (&dst)[N], const char *src)	786	inline int assign (char (&dst)[N], const char *src)
467	{	787	{
468	assign ((char *)&dst, src, N);	788	return assign ((char *)&dst, src, N);
469	}	789	}
470		790
471	typedef double tstamp;	791	typedef double tstamp;
472		792
473	// return current time as timestampe	793	// return current time as timestamp
474	tstamp now ();	794	tstamp now ();
475		795
476	int similar_direction (int a, int b);	796	int similar_direction (int a, int b);
477		797
478	// like printf, but returns a std::string	798	// like v?sprintf, but returns a "static" buffer
479	const std::string format (const char *format, ...);	799	char vformat (const char format, va_list ap);
		800	char format (const char format, ...) ecb_attribute ((format (printf, 1, 2)));
480		801
		802	// safety-check player input which will become object->msg
		803	bool msg_is_safe (const char *msg);
		804
		805	/////////////////////////////////////////////////////////////////////////////
		806	// threads, very very thin wrappers around pthreads
		807
		808	struct thread
		809	{
		810	pthread_t id;
		811
		812	void start (void (start_routine)(void ), void arg = 0);
		813
		814	void cancel ()
		815	{
		816	pthread_cancel (id);
		817	}
		818
		819	void *join ()
		820	{
		821	void *ret;
		822
		823	if (pthread_join (id, &ret))
		824	cleanup ("pthread_join failed", 1);
		825
		826	return ret;
		827	}
		828	};
		829
		830	// note that mutexes are not classes
		831	typedef pthread_mutex_t smutex;
		832
		833	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		834	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		835	#else
		836	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
481	#endif	837	#endif
482		838
		839	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		840	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		841	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		842
		843	typedef pthread_cond_t scond;
		844
		845	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		846	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		847	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		848	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		849
		850	#endif
		851

Diff Legend

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

Comparing deliantra/server/include/util.h (file contents): Revision 1.46 by root, Mon May 28 21:15:56 2007 UTC vs. Revision 1.129 by root, Sat Dec 1 20:22:13 2018 UTC

Diff Legend

Comparing deliantra/server/include/util.h (file contents):
Revision 1.46 by root, Mon May 28 21:15:56 2007 UTC vs.
Revision 1.129 by root, Sat Dec 1 20:22:13 2018 UTC