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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.45 by root, Sat May 26 15:44:05 2007 UTC vs.
Revision 1.122 by root, Mon Nov 12 02:39:51 2012 UTC

…		…
		1	/*
		2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
		3	*
		4	* Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
		5	*
		6	* Deliantra is free software: you can redistribute it and/or modify it under
		7	* the terms of the Affero GNU General Public License as published by the
		8	* Free Software Foundation, either version 3 of the License, or (at your
		9	* 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 Affero GNU General Public License
		17	* and the GNU General Public License along with this program. If not, see
		18	* <http://www.gnu.org/licenses/>.
		19	*
		20	* The authors can be reached via e-mail to <support@deliantra.net>
		21	*/
		22
1	#ifndef UTIL_H__	23	#ifndef UTIL_H__
2	#define UTIL_H__	24	#define UTIL_H__
3		25
4	//#define PREFER_MALLOC	26	#include <compiler.h>
5		27
6	#if __GNUC__ >= 3	28	#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0
7	# define is_constant(c) __builtin_constant_p (c)	29	#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs
8	# define expect(expr,value) __builtin_expect ((expr),(value))	30	#define PREFER_MALLOC 0 // use malloc and not the slice allocator
9	# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
10	#else
11	# define is_constant(c) 0
12	# define expect(expr,value) (expr)
13	# define prefetch(addr,rw,locality)
14	#endif
15		31
16	// put into ifs if you are very sure that the expression	32	#include <pthread.h>
17	// is mostly true or mosty false. note that these return
18	// booleans, not the expression.
19	#define expect_false(expr) expect ((expr) != 0, 0)
20	#define expect_true(expr) expect ((expr) != 0, 1)
21		33
22	#include <cstddef>	34	#include <cstddef>
23	#include <cmath>	35	#include <cmath>
24	#include <new>	36	#include <new>
25	#include <vector>	37	#include <vector>
27	#include <glib.h>	39	#include <glib.h>
28		40
29	#include <shstr.h>	41	#include <shstr.h>
30	#include <traits.h>	42	#include <traits.h>
31		43
		44	#if DEBUG_SALLOC
		45	# define g_slice_alloc0(s) debug_slice_alloc0(s)
		46	# define g_slice_alloc(s) debug_slice_alloc(s)
		47	# define g_slice_free1(s,p) debug_slice_free1(s,p)
		48	void *g_slice_alloc (unsigned long size);
		49	void *g_slice_alloc0 (unsigned long size);
		50	void g_slice_free1 (unsigned long size, void *ptr);
		51	#elif PREFER_MALLOC
		52	# define g_slice_alloc0(s) calloc (1, (s))
		53	# define g_slice_alloc(s) malloc ((s))
		54	# define g_slice_free1(s,p) free ((p))
		55	#endif
		56
32	// use a gcc extension for auto declarations until ISO C++ sanctifies them	57	// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
33	#define auto(var,expr) typeof(expr) var = (expr)	58	#define auto(var,expr) decltype(expr) var = (expr)
34		59
		60	#if cplusplus_does_not_suck
		61	// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
		62	template<typename T, int N>
		63	static inline int array_length (const T (&arr)[N])
		64	{
		65	return N;
		66	}
		67	#else
		68	#define array_length(name) (sizeof (name) / sizeof (name [0]))
		69	#endif
		70
35	// very ugly macro that basicaly declares and initialises a variable	71	// very ugly macro that basically declares and initialises a variable
36	// that is in scope for the next statement only	72	// that is in scope for the next statement only
37	// works only for stuff that can be assigned 0 and converts to false	73	// works only for stuff that can be assigned 0 and converts to false
38	// (note: works great for pointers)	74	// (note: works great for pointers)
39	// most ugly macro I ever wrote	75	// most ugly macro I ever wrote
40	#define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)	76	#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
41		77
42	// in range including end	78	// in range including end
43	#define IN_RANGE_INC(val,beg,end) \	79	#define IN_RANGE_INC(val,beg,end) \
44	((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))	80	((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
45		81
46	// in range excluding end	82	// in range excluding end
47	#define IN_RANGE_EXC(val,beg,end) \	83	#define IN_RANGE_EXC(val,beg,end) \
48	((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))	84	((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))
49		85
		86	void cleanup (const char *cause, bool make_core = false);
50	void fork_abort (const char *msg);	87	void fork_abort (const char *msg);
51		88
52	// rationale for using (U) not (T) is to reduce signed/unsigned issues,	89	// rationale for using (U) not (T) is to reduce signed/unsigned issues,
53	// as a is often a constant while b is the variable. it is still a bug, though.	90	// as a is often a constant while b is the variable. it is still a bug, though.
54	template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; }	91	template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }
55	template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; }	92	template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }
56	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; }	93	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; }
57		94
		95	template<typename T, typename U> static inline void min_it (T &v, U m) { v = min (v, (T)m); }
		96	template<typename T, typename U> static inline void max_it (T &v, U m) { v = max (v, (T)m); }
		97	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); }
		98
58	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }	99	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
59		100
		101	template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); }
		102	template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); }
		103
		104	// sign returns -1 or +1
		105	template<typename T>
		106	static inline T sign (T v) { return v < 0 ? -1 : +1; }
		107	// relies on 2c representation
		108	template<>
		109	inline sint8 sign (sint8 v) { return 1 - (sint8 (uint8 (v) >> 7) * 2); }
		110	template<>
		111	inline sint16 sign (sint16 v) { return 1 - (sint16 (uint16 (v) >> 15) * 2); }
		112	template<>
		113	inline sint32 sign (sint32 v) { return 1 - (sint32 (uint32 (v) >> 31) * 2); }
		114
		115	// sign0 returns -1, 0 or +1
		116	template<typename T>
		117	static inline T sign0 (T v) { return v ? sign (v) : 0; }
		118
		119	//clashes with C++0x
		120	template<typename T, typename U>
		121	static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
		122
		123	// div* only work correctly for div > 0
		124	// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
		125	template<typename T> static inline T div (T val, T div)
		126	{
		127	return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
		128	}
		129
		130	template<> inline float div (float val, float div) { return val / div; }
		131	template<> inline double div (double val, double div) { return val / div; }
		132
		133	// div, round-up
		134	template<typename T> static inline T div_ru (T val, T div)
		135	{
		136	return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
		137	}
		138	// div, round-down
		139	template<typename T> static inline T div_rd (T val, T div)
		140	{
		141	return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div;
		142	}
		143
		144	// lerp* only work correctly for min_in < max_in
		145	// Linear intERPolate, scales val from min_in..max_in to min_out..max_out
60	template<typename T>	146	template<typename T>
61	static inline T	147	static inline T
62	lerp (T val, T min_in, T max_in, T min_out, T max_out)	148	lerp (T val, T min_in, T max_in, T min_out, T max_out)
63	{	149	{
64	return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out;	150	return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		151	}
		152
		153	// lerp, round-down
		154	template<typename T>
		155	static inline T
		156	lerp_rd (T val, T min_in, T max_in, T min_out, T max_out)
		157	{
		158	return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		159	}
		160
		161	// lerp, round-up
		162	template<typename T>
		163	static inline T
		164	lerp_ru (T val, T min_in, T max_in, T min_out, T max_out)
		165	{
		166	return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
65	}	167	}
66		168
67	// lots of stuff taken from FXT	169	// lots of stuff taken from FXT
68		170
69	/* Rotate right. This is used in various places for checksumming */	171	/* Rotate right. This is used in various places for checksumming */
…		…
107	int32_t d = b - a;	209	int32_t d = b - a;
108	d &= d >> 31;	210	d &= d >> 31;
109	return b - d;	211	return b - d;
110	}	212	}
111		213
112	// this is much faster than crossfires original algorithm	214	// this is much faster than crossfire's original algorithm
113	// on modern cpus	215	// on modern cpus
114	inline int	216	inline int
115	isqrt (int n)	217	isqrt (int n)
116	{	218	{
117	return (int)sqrtf ((float)n);	219	return (int)sqrtf ((float)n);
		220	}
		221
		222	// this is kind of like the ^^ operator, if it would exist, without sequence point.
		223	// more handy than it looks like, due to the implicit !! done on its arguments
		224	inline bool
		225	logical_xor (bool a, bool b)
		226	{
		227	return a != b;
		228	}
		229
		230	inline bool
		231	logical_implies (bool a, bool b)
		232	{
		233	return a <= b;
118	}	234	}
119		235
120	// this is only twice as fast as naive sqrtf (dxdy+dydy)	236	// this is only twice as fast as naive sqrtf (dxdy+dydy)
121	#if 0	237	#if 0
122	// and has a max. error of 6 in the range -100..+100.	238	// and has a max. error of 6 in the range -100..+100.
123	#else	239	#else
124	// and has a max. error of 9 in the range -100..+100.	240	// and has a max. error of 9 in the range -100..+100.
125	#endif	241	#endif
126	inline int	242	inline int
127	idistance (int dx, int dy)	243	idistance (int dx, int dy)
128	{	244	{
129	unsigned int dx_ = abs (dx);	245	unsigned int dx_ = abs (dx);
130	unsigned int dy_ = abs (dy);	246	unsigned int dy_ = abs (dy);
131		247
132	#if 0	248	#if 0
133	return dx_ > dy_	249	return dx_ > dy_
…		…
136	#else	252	#else
137	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;	253	return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
138	#endif	254	#endif
139	}	255	}
140		256
		257	// can be substantially faster than floor, if your value range allows for it
		258	template<typename T>
		259	inline T
		260	fastfloor (T x)
		261	{
		262	return std::floor (x);
		263	}
		264
		265	inline float
		266	fastfloor (float x)
		267	{
		268	return sint32(x) - (x < 0);
		269	}
		270
		271	inline double
		272	fastfloor (double x)
		273	{
		274	return sint64(x) - (x < 0);
		275	}
		276
141	/*	277	/*
142	* absdir(int): Returns a number between 1 and 8, which represent	278	* absdir(int): Returns a number between 1 and 8, which represent
143	* the "absolute" direction of a number (it actually takes care of	279	* the "absolute" direction of a number (it actually takes care of
144	* "overflow" in previous calculations of a direction).	280	* "overflow" in previous calculations of a direction).
145	*/	281	*/
…		…
147	absdir (int d)	283	absdir (int d)
148	{	284	{
149	return ((d - 1) & 7) + 1;	285	return ((d - 1) & 7) + 1;
150	}	286	}
151		287
		288	// avoid ctz name because netbsd or freebsd spams it's namespace with it
		289	#if GCC_VERSION(3,4)
		290	static inline int least_significant_bit (uint32_t x)
		291	{
		292	return __builtin_ctz (x);
		293	}
		294	#else
		295	int least_significant_bit (uint32_t x);
		296	#endif
		297
		298	#define for_all_bits_sparse_32(mask, idxvar) \
		299	for (uint32_t idxvar, mask_ = mask; \
		300	mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);)
		301
		302	extern ssize_t slice_alloc; // statistics
		303
		304	void *salloc_ (int n) throw (std::bad_alloc);
		305	void salloc_ (int n, void src) throw (std::bad_alloc);
		306
		307	// strictly the same as g_slice_alloc, but never returns 0
		308	template<typename T>
		309	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
		310
		311	// also copies src into the new area, like "memdup"
		312	// if src is 0, clears the memory
		313	template<typename T>
		314	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
		315
		316	// clears the memory
		317	template<typename T>
		318	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
		319
		320	// for symmetry
		321	template<typename T>
		322	inline void sfree (T *ptr, int n = 1) throw ()
		323	{
		324	if (expect_true (ptr))
		325	{
		326	slice_alloc -= n * sizeof (T);
		327	if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
		328	g_slice_free1 (n * sizeof (T), (void *)ptr);
		329	}
		330	}
		331
		332	// nulls the pointer
		333	template<typename T>
		334	inline void sfree0 (T *&ptr, int n = 1) throw ()
		335	{
		336	sfree<T> (ptr, n);
		337	ptr = 0;
		338	}
		339
152	// makes dynamically allocated objects zero-initialised	340	// makes dynamically allocated objects zero-initialised
153	struct zero_initialised	341	struct zero_initialised
154	{	342	{
155	void operator new (size_t s, void p)	343	void operator new (size_t s, void p)
156	{	344	{
…		…
158	return p;	346	return p;
159	}	347	}
160		348
161	void *operator new (size_t s)	349	void *operator new (size_t s)
162	{	350	{
163	return g_slice_alloc0 (s);	351	return salloc0<char> (s);
164	}	352	}
165		353
166	void *operator new[] (size_t s)	354	void *operator new[] (size_t s)
167	{	355	{
168	return g_slice_alloc0 (s);	356	return salloc0<char> (s);
169	}	357	}
170		358
171	void operator delete (void *p, size_t s)	359	void operator delete (void *p, size_t s)
172	{	360	{
173	g_slice_free1 (s, p);	361	sfree ((char *)p, s);
174	}	362	}
175		363
176	void operator delete[] (void *p, size_t s)	364	void operator delete[] (void *p, size_t s)
177	{	365	{
178	g_slice_free1 (s, p);	366	sfree ((char *)p, s);
179	}	367	}
180	};	368	};
181		369
182	void *salloc_ (int n) throw (std::bad_alloc);	370	// makes dynamically allocated objects zero-initialised
183	void salloc_ (int n, void src) throw (std::bad_alloc);	371	struct slice_allocated
184
185	// strictly the same as g_slice_alloc, but never returns 0
186	template<typename T>
187	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
188
189	// also copies src into the new area, like "memdup"
190	// if src is 0, clears the memory
191	template<typename T>
192	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
193
194	// clears the memory
195	template<typename T>
196	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
197
198	// for symmetry
199	template<typename T>
200	inline void sfree (T *ptr, int n = 1) throw ()
201	{	372	{
202	#ifdef PREFER_MALLOC	373	void operator new (size_t s, void p)
203	free (ptr);	374	{
204	#else	375	return p;
205	g_slice_free1 (n * sizeof (T), (void *)ptr);	376	}
206	#endif	377
207	}	378	void *operator new (size_t s)
		379	{
		380	return salloc<char> (s);
		381	}
		382
		383	void *operator new[] (size_t s)
		384	{
		385	return salloc<char> (s);
		386	}
		387
		388	void operator delete (void *p, size_t s)
		389	{
		390	sfree ((char *)p, s);
		391	}
		392
		393	void operator delete[] (void *p, size_t s)
		394	{
		395	sfree ((char *)p, s);
		396	}
		397	};
208		398
209	// a STL-compatible allocator that uses g_slice	399	// a STL-compatible allocator that uses g_slice
210	// boy, this is verbose	400	// boy, this is verbose
211	template<typename Tp>	401	template<typename Tp>
212	struct slice_allocator	402	struct slice_allocator
…		…
217	typedef const Tp *const_pointer;	407	typedef const Tp *const_pointer;
218	typedef Tp &reference;	408	typedef Tp &reference;
219	typedef const Tp &const_reference;	409	typedef const Tp &const_reference;
220	typedef Tp value_type;	410	typedef Tp value_type;
221		411
222	template <class U>	412	template <class U>
223	struct rebind	413	struct rebind
224	{	414	{
225	typedef slice_allocator<U> other;	415	typedef slice_allocator<U> other;
226	};	416	};
227		417
228	slice_allocator () throw () { }	418	slice_allocator () throw () { }
229	slice_allocator (const slice_allocator &o) throw () { }	419	slice_allocator (const slice_allocator &) throw () { }
230	template<typename Tp2>	420	template<typename Tp2>
231	slice_allocator (const slice_allocator<Tp2> &) throw () { }	421	slice_allocator (const slice_allocator<Tp2> &) throw () { }
232		422
233	~slice_allocator () { }	423	~slice_allocator () { }
234		424
…		…
243	void deallocate (pointer p, size_type n)	433	void deallocate (pointer p, size_type n)
244	{	434	{
245	sfree<Tp> (p, n);	435	sfree<Tp> (p, n);
246	}	436	}
247		437
248	size_type max_size ()const throw ()	438	size_type max_size () const throw ()
249	{	439	{
250	return size_t (-1) / sizeof (Tp);	440	return size_t (-1) / sizeof (Tp);
251	}	441	}
252		442
253	void construct (pointer p, const Tp &val)	443	void construct (pointer p, const Tp &val)
…		…
259	{	449	{
260	p->~Tp ();	450	p->~Tp ();
261	}	451	}
262	};	452	};
263		453
264	// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.	454	// basically a memory area, but refcounted
265	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps	455	struct refcnt_buf
266	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
267	struct tausworthe_random_generator
268	{	456	{
269	// generator	457	char *data;
270	uint32_t state [4];
271		458
272	void operator =(const tausworthe_random_generator &src)	459	refcnt_buf (size_t size = 0);
273	{	460	refcnt_buf (void *data, size_t size);
274	state [0] = src.state [0];
275	state [1] = src.state [1];
276	state [2] = src.state [2];
277	state [3] = src.state [3];
278	}
279		461
280	void seed (uint32_t seed);	462	refcnt_buf (const refcnt_buf &src)
281	uint32_t next ();
282
283	// uniform distribution
284	uint32_t operator ()(uint32_t num)
285	{	463	{
286	return is_constant (num)	464	data = src.data;
287	? (next () * (uint64_t)num) >> 32U	465	inc ();
288	: get_range (num);
289	}	466	}
290		467
291	// return a number within (min .. max)	468	~refcnt_buf ();
292	int operator () (int r_min, int r_max)
293	{
294	return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
295	? r_min + operator ()(r_max - r_min + 1)
296	: get_range (r_min, r_max);
297	}
298		469
299	double operator ()()	470	refcnt_buf &operator =(const refcnt_buf &src);
		471
		472	operator char *()
300	{	473	{
301	return this->next () / (double)0xFFFFFFFFU;	474	return data;
		475	}
		476
		477	size_t size () const
		478	{
		479	return _size ();
302	}	480	}
303		481
304	protected:	482	protected:
305	uint32_t get_range (uint32_t r_max);	483	enum {
306	int get_range (int r_min, int r_max);	484	overhead = sizeof (uint32_t) * 2
307	};	485	};
308		486
309	typedef tausworthe_random_generator rand_gen;	487	uint32_t &_size () const
		488	{
		489	return ((unsigned int *)data)[-2];
		490	}
310		491
311	extern rand_gen rndm;	492	uint32_t &_refcnt () const
		493	{
		494	return ((unsigned int *)data)[-1];
		495	}
		496
		497	void _alloc (uint32_t size)
		498	{
		499	data = ((char *)salloc<char> (size + overhead)) + overhead;
		500	_size () = size;
		501	_refcnt () = 1;
		502	}
		503
		504	void _dealloc ();
		505
		506	void inc ()
		507	{
		508	++_refcnt ();
		509	}
		510
		511	void dec ()
		512	{
		513	if (!--_refcnt ())
		514	_dealloc ();
		515	}
		516	};
		517
		518	INTERFACE_CLASS (attachable)
		519	struct refcnt_base
		520	{
		521	typedef int refcnt_t;
		522	mutable refcnt_t ACC (RW, refcnt);
		523
		524	MTH void refcnt_inc () const { ++refcnt; }
		525	MTH void refcnt_dec () const { --refcnt; }
		526
		527	refcnt_base () : refcnt (0) { }
		528	};
		529
		530	// to avoid branches with more advanced compilers
		531	extern refcnt_base::refcnt_t refcnt_dummy;
312		532
313	template<class T>	533	template<class T>
314	struct refptr	534	struct refptr
315	{	535	{
		536	// p if not null
		537	refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
		538
		539	void refcnt_dec ()
		540	{
		541	if (!is_constant (p))
		542	--*refcnt_ref ();
		543	else if (p)
		544	--p->refcnt;
		545	}
		546
		547	void refcnt_inc ()
		548	{
		549	if (!is_constant (p))
		550	++*refcnt_ref ();
		551	else if (p)
		552	++p->refcnt;
		553	}
		554
316	T *p;	555	T *p;
317		556
318	refptr () : p(0) { }	557	refptr () : p(0) { }
319	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	558	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
320	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	559	refptr (T *p) : p(p) { refcnt_inc (); }
321	~refptr () { if (p) p->refcnt_dec (); }	560	~refptr () { refcnt_dec (); }
322		561
323	const refptr<T> &operator =(T *o)	562	const refptr<T> &operator =(T *o)
324	{	563	{
		564	// if decrementing ever destroys we need to reverse the order here
325	if (p) p->refcnt_dec ();	565	refcnt_dec ();
326	p = o;	566	p = o;
327	if (p) p->refcnt_inc ();	567	refcnt_inc ();
328
329	return *this;	568	return *this;
330	}	569	}
331		570
332	const refptr<T> &operator =(const refptr<T> o)	571	const refptr<T> &operator =(const refptr<T> &o)
333	{	572	{
334	*this = o.p;	573	*this = o.p;
335	return *this;	574	return *this;
336	}	575	}
337		576
338	T &operator * () const { return *p; }	577	T &operator * () const { return *p; }
339	T *operator ->() const { return p; }	578	T *operator ->() const { return p; }
340		579
341	operator T *() const { return p; }	580	operator T *() const { return p; }
342	};	581	};
343		582
344	typedef refptr<maptile> maptile_ptr;	583	typedef refptr<maptile> maptile_ptr;
345	typedef refptr<object> object_ptr;	584	typedef refptr<object> object_ptr;
346	typedef refptr<archetype> arch_ptr;	585	typedef refptr<archetype> arch_ptr;
347	typedef refptr<client> client_ptr;	586	typedef refptr<client> client_ptr;
348	typedef refptr<player> player_ptr;	587	typedef refptr<player> player_ptr;
		588	typedef refptr<region> region_ptr;
		589
		590	#define STRHSH_NULL 2166136261
		591
		592	static inline uint32_t
		593	strhsh (const char *s)
		594	{
		595	// use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
		596	// it is about twice as fast as the one-at-a-time one,
		597	// with good distribution.
		598	// FNV-1a is faster on many cpus because the multiplication
		599	// runs concurrently with the looping logic.
		600	// we modify the hash a bit to improve its distribution
		601	uint32_t hash = STRHSH_NULL;
		602
		603	while (*s)
		604	hash = (hash ^ s++) 16777619U;
		605
		606	return hash ^ (hash >> 16);
		607	}
		608
		609	static inline uint32_t
		610	memhsh (const char *s, size_t len)
		611	{
		612	uint32_t hash = STRHSH_NULL;
		613
		614	while (len--)
		615	hash = (hash ^ s++) 16777619U;
		616
		617	return hash;
		618	}
349		619
350	struct str_hash	620	struct str_hash
351	{	621	{
352	std::size_t operator ()(const char *s) const	622	std::size_t operator ()(const char *s) const
353	{	623	{
354	unsigned long hash = 0;
355
356	/* use the one-at-a-time hash function, which supposedly is
357	* better than the djb2-like one used by perl5.005, but
358	* certainly is better then the bug used here before.
359	* see http://burtleburtle.net/bob/hash/doobs.html
360	*/
361	while (*s)
362	{
363	hash += *s++;
364	hash += hash << 10;
365	hash ^= hash >> 6;
366	}
367
368	hash += hash << 3;
369	hash ^= hash >> 11;
370	hash += hash << 15;
371
372	return hash;	624	return strhsh (s);
		625	}
		626
		627	std::size_t operator ()(const shstr &s) const
		628	{
		629	return strhsh (s);
373	}	630	}
374	};	631	};
375		632
376	struct str_equal	633	struct str_equal
377	{	634	{
…		…
379	{	636	{
380	return !strcmp (a, b);	637	return !strcmp (a, b);
381	}	638	}
382	};	639	};
383		640
		641	// Mostly the same as std::vector, but insert/erase can reorder
		642	// the elements, making append(=insert)/remove O(1) instead of O(n).
		643	//
		644	// NOTE: only some forms of erase are available
384	template<class T>	645	template<class T>
385	struct unordered_vector : std::vector<T, slice_allocator<T> >	646	struct unordered_vector : std::vector<T, slice_allocator<T> >
386	{	647	{
387	typedef typename unordered_vector::iterator iterator;	648	typedef typename unordered_vector::iterator iterator;
388		649
…		…
398	{	659	{
399	erase ((unsigned int )(i - this->begin ()));	660	erase ((unsigned int )(i - this->begin ()));
400	}	661	}
401	};	662	};
402		663
403	template<class T, int T::* index>	664	// This container blends advantages of linked lists
		665	// (efficiency) with vectors (random access) by
		666	// using an unordered vector and storing the vector
		667	// index inside the object.
		668	//
		669	// + memory-efficient on most 64 bit archs
		670	// + O(1) insert/remove
		671	// + free unique (but varying) id for inserted objects
		672	// + cache-friendly iteration
		673	// - only works for pointers to structs
		674	//
		675	// NOTE: only some forms of erase/insert are available
		676	typedef int object_vector_index;
		677
		678	template<class T, object_vector_index T::*indexmember>
404	struct object_vector : std::vector<T , slice_allocator<T > >	679	struct object_vector : std::vector<T , slice_allocator<T > >
405	{	680	{
		681	typedef typename object_vector::iterator iterator;
		682
		683	bool contains (const T *obj) const
		684	{
		685	return obj->*indexmember;
		686	}
		687
		688	iterator find (const T *obj)
		689	{
		690	return obj->*indexmember
		691	? this->begin () + obj->*indexmember - 1
		692	: this->end ();
		693	}
		694
		695	void push_back (T *obj)
		696	{
		697	std::vector<T , slice_allocator<T > >::push_back (obj);
		698	obj->*indexmember = this->size ();
		699	}
		700
406	void insert (T *obj)	701	void insert (T *obj)
407	{	702	{
408	assert (!(obj->*index));
409	push_back (obj);	703	push_back (obj);
410	obj->*index = this->size ();
411	}	704	}
412		705
413	void insert (T &obj)	706	void insert (T &obj)
414	{	707	{
415	insert (&obj);	708	insert (&obj);
416	}	709	}
417		710
418	void erase (T *obj)	711	void erase (T *obj)
419	{	712	{
420	assert (obj->*index);	713	object_vector_index pos = obj->*indexmember;
421	unsigned int pos = obj->*index;
422	obj->*index = 0;	714	obj->*indexmember = 0;
423		715
424	if (pos < this->size ())	716	if (pos < this->size ())
425	{	717	{
426	(this)[pos - 1] = (this)[this->size () - 1];	718	(this)[pos - 1] = (this)[this->size () - 1];
427	(this)[pos - 1]->index = pos;	719	(this)[pos - 1]->indexmember = pos;
428	}	720	}
429		721
430	this->pop_back ();	722	this->pop_back ();
431	}	723	}
432		724
433	void erase (T &obj)	725	void erase (T &obj)
434	{	726	{
435	errase (&obj);	727	erase (&obj);
436	}	728	}
437	};	729	};
		730
		731	/////////////////////////////////////////////////////////////////////////////
		732
		733	// something like a vector or stack, but without
		734	// out of bounds checking
		735	template<typename T>
		736	struct fixed_stack
		737	{
		738	T *data;
		739	int size;
		740	int max;
		741
		742	fixed_stack ()
		743	: size (0), data (0)
		744	{
		745	}
		746
		747	fixed_stack (int max)
		748	: size (0), max (max)
		749	{
		750	data = salloc<T> (max);
		751	}
		752
		753	void reset (int new_max)
		754	{
		755	sfree (data, max);
		756	size = 0;
		757	max = new_max;
		758	data = salloc<T> (max);
		759	}
		760
		761	void free ()
		762	{
		763	sfree (data, max);
		764	data = 0;
		765	}
		766
		767	~fixed_stack ()
		768	{
		769	sfree (data, max);
		770	}
		771
		772	T &operator[](int idx)
		773	{
		774	return data [idx];
		775	}
		776
		777	void push (T v)
		778	{
		779	data [size++] = v;
		780	}
		781
		782	T &pop ()
		783	{
		784	return data [--size];
		785	}
		786
		787	T remove (int idx)
		788	{
		789	T v = data [idx];
		790
		791	data [idx] = data [--size];
		792
		793	return v;
		794	}
		795	};
		796
		797	/////////////////////////////////////////////////////////////////////////////
438		798
439	// basically does what strncpy should do, but appends "..." to strings exceeding length	799	// basically does what strncpy should do, but appends "..." to strings exceeding length
		800	// returns the number of bytes actually used (including \0)
440	void assign (char dst, const char src, int maxlen);	801	int assign (char dst, const char src, int maxsize);
441		802
442	// type-safe version of assign	803	// type-safe version of assign
443	template<int N>	804	template<int N>
444	inline void assign (char (&dst)[N], const char *src)	805	inline int assign (char (&dst)[N], const char *src)
445	{	806	{
446	assign ((char *)&dst, src, N);	807	return assign ((char *)&dst, src, N);
447	}	808	}
448		809
449	typedef double tstamp;	810	typedef double tstamp;
450		811
451	// return current time as timestampe	812	// return current time as timestamp
452	tstamp now ();	813	tstamp now ();
453		814
454	int similar_direction (int a, int b);	815	int similar_direction (int a, int b);
455		816
456	// like printf, but returns a std::string	817	// like v?sprintf, but returns a "static" buffer
457	const std::string format (const char *format, ...);	818	char vformat (const char format, va_list ap);
		819	char format (const char format, ...) attribute ((format (printf, 1, 2)));
458		820
		821	// safety-check player input which will become object->msg
		822	bool msg_is_safe (const char *msg);
		823
		824	/////////////////////////////////////////////////////////////////////////////
		825	// threads, very very thin wrappers around pthreads
		826
		827	struct thread
		828	{
		829	pthread_t id;
		830
		831	void start (void (start_routine)(void ), void arg = 0);
		832
		833	void cancel ()
		834	{
		835	pthread_cancel (id);
		836	}
		837
		838	void *join ()
		839	{
		840	void *ret;
		841
		842	if (pthread_join (id, &ret))
		843	cleanup ("pthread_join failed", 1);
		844
		845	return ret;
		846	}
		847	};
		848
		849	// note that mutexes are not classes
		850	typedef pthread_mutex_t smutex;
		851
		852	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		853	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		854	#else
		855	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
459	#endif	856	#endif
460		857
		858	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		859	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		860	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		861
		862	typedef pthread_cond_t scond;
		863
		864	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		865	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		866	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		867	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		868
		869	#endif
		870

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Comparing deliantra/server/include/util.h (file contents): Revision 1.45 by root, Sat May 26 15:44:05 2007 UTC vs. Revision 1.122 by root, Mon Nov 12 02:39:51 2012 UTC

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Comparing deliantra/server/include/util.h (file contents):
Revision 1.45 by root, Sat May 26 15:44:05 2007 UTC vs.
Revision 1.122 by root, Mon Nov 12 02:39:51 2012 UTC