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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.36 by root, Thu Jan 25 03:54:45 2007 UTC vs.
Revision 1.109 by root, Tue Jun 29 16:52:53 2010 UTC

…		…
		1	/*
		2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
		3	*
		4	* Copyright (©) 2005,2006,2007,2008,2009,2010 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	#else	30	#define PREFER_MALLOC 0 // use malloc and not the slice allocator
9	# define is_constant(c) 0	31
10	#endif	32	#include <pthread.h>
11		33
12	#include <cstddef>	34	#include <cstddef>
13	#include <cmath>	35	#include <cmath>
14	#include <new>	36	#include <new>
15	#include <vector>	37	#include <vector>
17	#include <glib.h>	39	#include <glib.h>
18		40
19	#include <shstr.h>	41	#include <shstr.h>
20	#include <traits.h>	42	#include <traits.h>
21		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
22	// 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)
23	#define AUTODECL(var,expr) typeof(expr) var = (expr)	58	#define auto(var,expr) decltype(expr) var = (expr)
24		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
25	// very ugly macro that basicaly declares and initialises a variable	71	// very ugly macro that basically declares and initialises a variable
26	// that is in scope for the next statement only	72	// that is in scope for the next statement only
27	// 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
28	// (note: works great for pointers)	74	// (note: works great for pointers)
29	// most ugly macro I ever wrote	75	// most ugly macro I ever wrote
30	#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)
31		77
32	// in range including end	78	// in range including end
33	#define IN_RANGE_INC(val,beg,end) \	79	#define IN_RANGE_INC(val,beg,end) \
34	((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))
35		81
36	// in range excluding end	82	// in range excluding end
37	#define IN_RANGE_EXC(val,beg,end) \	83	#define IN_RANGE_EXC(val,beg,end) \
38	((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))
39		85
		86	void cleanup (const char *cause, bool make_core = false);
40	void fork_abort (const char *msg);	87	void fork_abort (const char *msg);
41		88
42	// 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,
43	// 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.
44	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 (U)a < b ? (U)a : b; }
45	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 (U)a > b ? (U)a : b; }
46	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; }
47		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
48	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; }
49		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	template<typename T, typename U>
		120	static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
		121
		122	// div* only work correctly for div > 0
		123	// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
		124	template<typename T> static inline T div (T val, T div)
		125	{
		126	return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
		127	}
		128
		129	template<> inline float div (float val, float div) { return val / div; }
		130	template<> inline double div (double val, double div) { return val / div; }
		131
		132	// div, round-up
		133	template<typename T> static inline T div_ru (T val, T div)
		134	{
		135	return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
		136	}
		137	// div, round-down
		138	template<typename T> static inline T div_rd (T val, T div)
		139	{
		140	return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div;
		141	}
		142
		143	// lerp* only work correctly for min_in < max_in
		144	// Linear intERPolate, scales val from min_in..max_in to min_out..max_out
		145	template<typename T>
		146	static inline T
		147	lerp (T val, T min_in, T max_in, T min_out, T max_out)
		148	{
		149	return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		150	}
		151
		152	// lerp, round-down
		153	template<typename T>
		154	static inline T
		155	lerp_rd (T val, T min_in, T max_in, T min_out, T max_out)
		156	{
		157	return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		158	}
		159
		160	// lerp, round-up
		161	template<typename T>
		162	static inline T
		163	lerp_ru (T val, T min_in, T max_in, T min_out, T max_out)
		164	{
		165	return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		166	}
		167
		168	// lots of stuff taken from FXT
		169
		170	/* Rotate right. This is used in various places for checksumming */
		171	//TODO: that sucks, use a better checksum algo
		172	static inline uint32_t
		173	rotate_right (uint32_t c, uint32_t count = 1)
		174	{
		175	return (c << (32 - count)) \| (c >> count);
		176	}
		177
		178	static inline uint32_t
		179	rotate_left (uint32_t c, uint32_t count = 1)
		180	{
		181	return (c >> (32 - count)) \| (c << count);
		182	}
		183
		184	// Return abs(a-b)
		185	// Both a and b must not have the most significant bit set
		186	static inline uint32_t
		187	upos_abs_diff (uint32_t a, uint32_t b)
		188	{
		189	long d1 = b - a;
		190	long d2 = (d1 & (d1 >> 31)) << 1;
		191
		192	return d1 - d2; // == (b - d) - (a + d);
		193	}
		194
		195	// Both a and b must not have the most significant bit set
		196	static inline uint32_t
		197	upos_min (uint32_t a, uint32_t b)
		198	{
		199	int32_t d = b - a;
		200	d &= d >> 31;
		201	return a + d;
		202	}
		203
		204	// Both a and b must not have the most significant bit set
		205	static inline uint32_t
		206	upos_max (uint32_t a, uint32_t b)
		207	{
		208	int32_t d = b - a;
		209	d &= d >> 31;
		210	return b - d;
		211	}
		212
50	// this is much faster than crossfires original algorithm	213	// this is much faster than crossfire's original algorithm
51	// on modern cpus	214	// on modern cpus
52	inline int	215	inline int
53	isqrt (int n)	216	isqrt (int n)
54	{	217	{
55	return (int)sqrtf ((float)n);	218	return (int)sqrtf ((float)n);
		219	}
		220
		221	// this is kind of like the ^^ operator, if it would exist, without sequence point.
		222	// more handy than it looks like, due to the implicit !! done on its arguments
		223	inline bool
		224	logical_xor (bool a, bool b)
		225	{
		226	return a != b;
		227	}
		228
		229	inline bool
		230	logical_implies (bool a, bool b)
		231	{
		232	return a <= b;
56	}	233	}
57		234
58	// this is only twice as fast as naive sqrtf (dxdy+dydy)	235	// this is only twice as fast as naive sqrtf (dxdy+dydy)
59	#if 0	236	#if 0
60	// and has a max. error of 6 in the range -100..+100.	237	// and has a max. error of 6 in the range -100..+100.
…		…
85	absdir (int d)	262	absdir (int d)
86	{	263	{
87	return ((d - 1) & 7) + 1;	264	return ((d - 1) & 7) + 1;
88	}	265	}
89		266
		267	// avoid ctz name because netbsd or freebsd spams it's namespace with it
		268	#if GCC_VERSION(3,4)
		269	static inline int least_significant_bit (uint32_t x)
		270	{
		271	return __builtin_ctz (x);
		272	}
		273	#else
		274	int least_significant_bit (uint32_t x);
		275	#endif
		276
		277	#define for_all_bits_sparse_32(mask, idxvar) \
		278	for (uint32_t idxvar, mask_ = mask; \
		279	mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);)
		280
		281	extern ssize_t slice_alloc; // statistics
		282
		283	void *salloc_ (int n) throw (std::bad_alloc);
		284	void salloc_ (int n, void src) throw (std::bad_alloc);
		285
		286	// strictly the same as g_slice_alloc, but never returns 0
		287	template<typename T>
		288	inline T salloc (int n = 1) throw (std::bad_alloc) { 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) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
		294
		295	// clears the memory
		296	template<typename T>
		297	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
		298
		299	// for symmetry
		300	template<typename T>
		301	inline void sfree (T *ptr, int n = 1) throw ()
		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	assert (slice_alloc >= 0);//D
		309	}
		310	}
		311
		312	// nulls the pointer
		313	template<typename T>
		314	inline void sfree0 (T *&ptr, int n = 1) throw ()
		315	{
		316	sfree<T> (ptr, n);
		317	ptr = 0;
		318	}
		319
90	// makes dynamically allocated objects zero-initialised	320	// makes dynamically allocated objects zero-initialised
91	struct zero_initialised	321	struct zero_initialised
92	{	322	{
93	void operator new (size_t s, void p)	323	void operator new (size_t s, void p)
94	{	324	{
…		…
96	return p;	326	return p;
97	}	327	}
98		328
99	void *operator new (size_t s)	329	void *operator new (size_t s)
100	{	330	{
101	return g_slice_alloc0 (s);	331	return salloc0<char> (s);
102	}	332	}
103		333
104	void *operator new[] (size_t s)	334	void *operator new[] (size_t s)
105	{	335	{
106	return g_slice_alloc0 (s);	336	return salloc0<char> (s);
107	}	337	}
108		338
109	void operator delete (void *p, size_t s)	339	void operator delete (void *p, size_t s)
110	{	340	{
111	g_slice_free1 (s, p);	341	sfree ((char *)p, s);
112	}	342	}
113		343
114	void operator delete[] (void *p, size_t s)	344	void operator delete[] (void *p, size_t s)
115	{	345	{
116	g_slice_free1 (s, p);	346	sfree ((char *)p, s);
117	}	347	}
118	};	348	};
119		349
120	void *salloc_ (int n) throw (std::bad_alloc);	350	// makes dynamically allocated objects zero-initialised
121	void salloc_ (int n, void src) throw (std::bad_alloc);	351	struct slice_allocated
122
123	// strictly the same as g_slice_alloc, but never returns 0
124	template<typename T>
125	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
126
127	// also copies src into the new area, like "memdup"
128	// if src is 0, clears the memory
129	template<typename T>
130	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
131
132	// clears the memory
133	template<typename T>
134	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
135
136	// for symmetry
137	template<typename T>
138	inline void sfree (T *ptr, int n = 1) throw ()
139	{	352	{
140	#ifdef PREFER_MALLOC	353	void operator new (size_t s, void p)
141	free (ptr);	354	{
142	#else	355	return p;
143	g_slice_free1 (n * sizeof (T), (void *)ptr);	356	}
144	#endif	357
145	}	358	void *operator new (size_t s)
		359	{
		360	return salloc<char> (s);
		361	}
		362
		363	void *operator new[] (size_t s)
		364	{
		365	return salloc<char> (s);
		366	}
		367
		368	void operator delete (void *p, size_t s)
		369	{
		370	sfree ((char *)p, s);
		371	}
		372
		373	void operator delete[] (void *p, size_t s)
		374	{
		375	sfree ((char *)p, s);
		376	}
		377	};
146		378
147	// a STL-compatible allocator that uses g_slice	379	// a STL-compatible allocator that uses g_slice
148	// boy, this is verbose	380	// boy, this is verbose
149	template<typename Tp>	381	template<typename Tp>
150	struct slice_allocator	382	struct slice_allocator
…		…
162	{	394	{
163	typedef slice_allocator<U> other;	395	typedef slice_allocator<U> other;
164	};	396	};
165		397
166	slice_allocator () throw () { }	398	slice_allocator () throw () { }
167	slice_allocator (const slice_allocator &o) throw () { }	399	slice_allocator (const slice_allocator &) throw () { }
168	template<typename Tp2>	400	template<typename Tp2>
169	slice_allocator (const slice_allocator<Tp2> &) throw () { }	401	slice_allocator (const slice_allocator<Tp2> &) throw () { }
170		402
171	~slice_allocator () { }	403	~slice_allocator () { }
172		404
…		…
181	void deallocate (pointer p, size_type n)	413	void deallocate (pointer p, size_type n)
182	{	414	{
183	sfree<Tp> (p, n);	415	sfree<Tp> (p, n);
184	}	416	}
185		417
186	size_type max_size ()const throw ()	418	size_type max_size () const throw ()
187	{	419	{
188	return size_t (-1) / sizeof (Tp);	420	return size_t (-1) / sizeof (Tp);
189	}	421	}
190		422
191	void construct (pointer p, const Tp &val)	423	void construct (pointer p, const Tp &val)
…		…
202	// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.	434	// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.
203	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps	435	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps
204	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps	436	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
205	struct tausworthe_random_generator	437	struct tausworthe_random_generator
206	{	438	{
207	// generator
208	uint32_t state [4];	439	uint32_t state [4];
209		440
210	void operator =(const tausworthe_random_generator &src)	441	void operator =(const tausworthe_random_generator &src)
211	{	442	{
212	state [0] = src.state [0];	443	state [0] = src.state [0];
…		…
215	state [3] = src.state [3];	446	state [3] = src.state [3];
216	}	447	}
217		448
218	void seed (uint32_t seed);	449	void seed (uint32_t seed);
219	uint32_t next ();	450	uint32_t next ();
		451	};
220		452
		453	// Xorshift RNGs, George Marsaglia
		454	// http://www.jstatsoft.org/v08/i14/paper
		455	// this one is about 40% faster than the tausworthe one above (i.e. not much),
		456	// despite the inlining, and has the issue of only creating 2**32-1 numbers.
		457	// see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf
		458	struct xorshift_random_generator
		459	{
		460	uint32_t x, y;
		461
		462	void operator =(const xorshift_random_generator &src)
		463	{
		464	x = src.x;
		465	y = src.y;
		466	}
		467
		468	void seed (uint32_t seed)
		469	{
		470	x = seed;
		471	y = seed * 69069U;
		472	}
		473
		474	uint32_t next ()
		475	{
		476	uint32_t t = x ^ (x << 10);
		477	x = y;
		478	y = y ^ (y >> 13) ^ t ^ (t >> 10);
		479	return y;
		480	}
		481	};
		482
		483	template<class generator>
		484	struct random_number_generator : generator
		485	{
221	// uniform distribution	486	// uniform distribution, [0 .. num - 1]
222	uint32_t operator ()(uint32_t r_max)	487	uint32_t operator ()(uint32_t num)
223	{	488	{
224	return is_constant (r_max)	489	return !is_constant (num) ? get_range (num) // non-constant
225	? this->next () % r_max	490	: num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two
226	: get_range (r_max);	491	: this->next () & (num - 1); // constant, power-of-two
227	}	492	}
228		493
229	// return a number within (min .. max)	494	// return a number within the closed interval [min .. max], max can be >, < or == min.
230	int operator () (int r_min, int r_max)	495	int operator () (int r_min, int r_max)
231	{	496	{
232	return is_constant (r_min) && is_constant (r_max)	497	return is_constant (r_min <= r_max) && r_min <= r_max
233	? r_min + (*this) (max (r_max - r_min + 1, 1))	498	? r_min + operator ()(r_max - r_min + 1)
234	: get_range (r_min, r_max);	499	: get_range (r_min, r_max);
235	}	500	}
236		501
		502	// return a number within the half-open interval [0..1[
237	double operator ()()	503	double operator ()()
238	{	504	{
239	return this->next () / (double)0xFFFFFFFFU;	505	return this->next () / (double)0x100000000ULL;
240	}	506	}
241		507
242	protected:	508	protected:
243	uint32_t get_range (uint32_t r_max);	509	uint32_t get_range (uint32_t r_max);
244	int get_range (int r_min, int r_max);	510	int get_range (int r_min, int r_max);
245	};	511	};
246		512
247	typedef tausworthe_random_generator rand_gen;	513	typedef random_number_generator<tausworthe_random_generator> rand_gen;
248		514
249	extern rand_gen rndm;	515	extern rand_gen rndm, rmg_rndm;
		516
		517	INTERFACE_CLASS (attachable)
		518	struct refcnt_base
		519	{
		520	typedef int refcnt_t;
		521	mutable refcnt_t ACC (RW, refcnt);
		522
		523	MTH void refcnt_inc () const { ++refcnt; }
		524	MTH void refcnt_dec () const { --refcnt; }
		525
		526	refcnt_base () : refcnt (0) { }
		527	};
		528
		529	// to avoid branches with more advanced compilers
		530	extern refcnt_base::refcnt_t refcnt_dummy;
250		531
251	template<class T>	532	template<class T>
252	struct refptr	533	struct refptr
253	{	534	{
		535	// p if not null
		536	refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
		537
		538	void refcnt_dec ()
		539	{
		540	if (!is_constant (p))
		541	--*refcnt_ref ();
		542	else if (p)
		543	--p->refcnt;
		544	}
		545
		546	void refcnt_inc ()
		547	{
		548	if (!is_constant (p))
		549	++*refcnt_ref ();
		550	else if (p)
		551	++p->refcnt;
		552	}
		553
254	T *p;	554	T *p;
255		555
256	refptr () : p(0) { }	556	refptr () : p(0) { }
257	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	557	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
258	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	558	refptr (T *p) : p(p) { refcnt_inc (); }
259	~refptr () { if (p) p->refcnt_dec (); }	559	~refptr () { refcnt_dec (); }
260		560
261	const refptr<T> &operator =(T *o)	561	const refptr<T> &operator =(T *o)
262	{	562	{
		563	// if decrementing ever destroys we need to reverse the order here
263	if (p) p->refcnt_dec ();	564	refcnt_dec ();
264	p = o;	565	p = o;
265	if (p) p->refcnt_inc ();	566	refcnt_inc ();
266
267	return *this;	567	return *this;
268	}	568	}
269		569
270	const refptr<T> &operator =(const refptr<T> o)	570	const refptr<T> &operator =(const refptr<T> &o)
271	{	571	{
272	*this = o.p;	572	*this = o.p;
273	return *this;	573	return *this;
274	}	574	}
275		575
276	T &operator * () const { return *p; }	576	T &operator * () const { return *p; }
277	T *operator ->() const { return p; }	577	T *operator ->() const { return p; }
278		578
279	operator T *() const { return p; }	579	operator T *() const { return p; }
280	};	580	};
281		581
282	typedef refptr<maptile> maptile_ptr;	582	typedef refptr<maptile> maptile_ptr;
283	typedef refptr<object> object_ptr;	583	typedef refptr<object> object_ptr;
284	typedef refptr<archetype> arch_ptr;	584	typedef refptr<archetype> arch_ptr;
285	typedef refptr<client> client_ptr;	585	typedef refptr<client> client_ptr;
286	typedef refptr<player> player_ptr;	586	typedef refptr<player> player_ptr;
		587	typedef refptr<region> region_ptr;
		588
		589	#define STRHSH_NULL 2166136261
		590
		591	static inline uint32_t
		592	strhsh (const char *s)
		593	{
		594	// use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
		595	// it is about twice as fast as the one-at-a-time one,
		596	// with good distribution.
		597	// FNV-1a is faster on many cpus because the multiplication
		598	// runs concurrently with the looping logic.
		599	uint32_t hash = STRHSH_NULL;
		600
		601	while (*s)
		602	hash = (hash ^ s++) 16777619U;
		603
		604	return hash;
		605	}
		606
		607	static inline uint32_t
		608	memhsh (const char *s, size_t len)
		609	{
		610	uint32_t hash = STRHSH_NULL;
		611
		612	while (len--)
		613	hash = (hash ^ s++) 16777619U;
		614
		615	return hash;
		616	}
287		617
288	struct str_hash	618	struct str_hash
289	{	619	{
290	std::size_t operator ()(const char *s) const	620	std::size_t operator ()(const char *s) const
291	{	621	{
292	unsigned long hash = 0;
293
294	/* use the one-at-a-time hash function, which supposedly is
295	* better than the djb2-like one used by perl5.005, but
296	* certainly is better then the bug used here before.
297	* see http://burtleburtle.net/bob/hash/doobs.html
298	*/
299	while (*s)
300	{
301	hash += *s++;
302	hash += hash << 10;
303	hash ^= hash >> 6;
304	}
305
306	hash += hash << 3;
307	hash ^= hash >> 11;
308	hash += hash << 15;
309
310	return hash;	622	return strhsh (s);
		623	}
		624
		625	std::size_t operator ()(const shstr &s) const
		626	{
		627	return strhsh (s);
311	}	628	}
312	};	629	};
313		630
314	struct str_equal	631	struct str_equal
315	{	632	{
…		…
317	{	634	{
318	return !strcmp (a, b);	635	return !strcmp (a, b);
319	}	636	}
320	};	637	};
321		638
		639	// Mostly the same as std::vector, but insert/erase can reorder
		640	// the elements, making append(=insert)/remove O(1) instead of O(n).
		641	//
		642	// NOTE: only some forms of erase are available
322	template<class T>	643	template<class T>
323	struct unordered_vector : std::vector<T, slice_allocator<T> >	644	struct unordered_vector : std::vector<T, slice_allocator<T> >
324	{	645	{
325	typedef typename unordered_vector::iterator iterator;	646	typedef typename unordered_vector::iterator iterator;
326		647
…		…
336	{	657	{
337	erase ((unsigned int )(i - this->begin ()));	658	erase ((unsigned int )(i - this->begin ()));
338	}	659	}
339	};	660	};
340		661
341	template<class T, int T::* index>	662	// This container blends advantages of linked lists
		663	// (efficiency) with vectors (random access) by
		664	// by using an unordered vector and storing the vector
		665	// index inside the object.
		666	//
		667	// + memory-efficient on most 64 bit archs
		668	// + O(1) insert/remove
		669	// + free unique (but varying) id for inserted objects
		670	// + cache-friendly iteration
		671	// - only works for pointers to structs
		672	//
		673	// NOTE: only some forms of erase/insert are available
		674	typedef int object_vector_index;
		675
		676	template<class T, object_vector_index T::*indexmember>
342	struct object_vector : std::vector<T , slice_allocator<T > >	677	struct object_vector : std::vector<T , slice_allocator<T > >
343	{	678	{
		679	typedef typename object_vector::iterator iterator;
		680
		681	bool contains (const T *obj) const
		682	{
		683	return obj->*indexmember;
		684	}
		685
		686	iterator find (const T *obj)
		687	{
		688	return obj->*indexmember
		689	? this->begin () + obj->*indexmember - 1
		690	: this->end ();
		691	}
		692
		693	void push_back (T *obj)
		694	{
		695	std::vector<T , slice_allocator<T > >::push_back (obj);
		696	obj->*indexmember = this->size ();
		697	}
		698
344	void insert (T *obj)	699	void insert (T *obj)
345	{	700	{
346	assert (!(obj->*index));
347	push_back (obj);	701	push_back (obj);
348	obj->*index = this->size ();
349	}	702	}
350		703
351	void insert (T &obj)	704	void insert (T &obj)
352	{	705	{
353	insert (&obj);	706	insert (&obj);
354	}	707	}
355		708
356	void erase (T *obj)	709	void erase (T *obj)
357	{	710	{
358	assert (obj->*index);
359	int pos = obj->*index;	711	unsigned int pos = obj->*indexmember;
360	obj->*index = 0;	712	obj->*indexmember = 0;
361		713
362	if (pos < this->size ())	714	if (pos < this->size ())
363	{	715	{
364	(this)[pos - 1] = (this)[this->size () - 1];	716	(this)[pos - 1] = (this)[this->size () - 1];
365	(this)[pos - 1]->index = pos;	717	(this)[pos - 1]->indexmember = pos;
366	}	718	}
367		719
368	this->pop_back ();	720	this->pop_back ();
369	}	721	}
370		722
371	void erase (T &obj)	723	void erase (T &obj)
372	{	724	{
373	errase (&obj);	725	erase (&obj);
374	}	726	}
375	};	727	};
376		728
377	// basically does what strncpy should do, but appends "..." to strings exceeding length	729	// basically does what strncpy should do, but appends "..." to strings exceeding length
		730	// returns the number of bytes actually used (including \0)
378	void assign (char dst, const char src, int maxlen);	731	int assign (char dst, const char src, int maxsize);
379		732
380	// type-safe version of assign	733	// type-safe version of assign
381	template<int N>	734	template<int N>
382	inline void assign (char (&dst)[N], const char *src)	735	inline int assign (char (&dst)[N], const char *src)
383	{	736	{
384	assign ((char *)&dst, src, N);	737	return assign ((char *)&dst, src, N);
385	}	738	}
386		739
387	typedef double tstamp;	740	typedef double tstamp;
388		741
389	// return current time as timestampe	742	// return current time as timestamp
390	tstamp now ();	743	tstamp now ();
391		744
392	int similar_direction (int a, int b);	745	int similar_direction (int a, int b);
393		746
		747	// like v?sprintf, but returns a "static" buffer
		748	char vformat (const char format, va_list ap);
		749	char format (const char format, ...) attribute ((format (printf, 1, 2)));
		750
		751	// safety-check player input which will become object->msg
		752	bool msg_is_safe (const char *msg);
		753
		754	/////////////////////////////////////////////////////////////////////////////
		755	// threads, very very thin wrappers around pthreads
		756
		757	struct thread
		758	{
		759	pthread_t id;
		760
		761	void start (void (start_routine)(void ), void arg = 0);
		762
		763	void cancel ()
		764	{
		765	pthread_cancel (id);
		766	}
		767
		768	void *join ()
		769	{
		770	void *ret;
		771
		772	if (pthread_join (id, &ret))
		773	cleanup ("pthread_join failed", 1);
		774
		775	return ret;
		776	}
		777	};
		778
		779	// note that mutexes are not classes
		780	typedef pthread_mutex_t smutex;
		781
		782	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		783	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		784	#else
		785	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
394	#endif	786	#endif
395		787
		788	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		789	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		790	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		791
		792	typedef pthread_cond_t scond;
		793
		794	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		795	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		796	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		797	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		798
		799	#endif
		800

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Comparing deliantra/server/include/util.h (file contents): Revision 1.36 by root, Thu Jan 25 03:54:45 2007 UTC vs. Revision 1.109 by root, Tue Jun 29 16:52:53 2010 UTC

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Comparing deliantra/server/include/util.h (file contents):
Revision 1.36 by root, Thu Jan 25 03:54:45 2007 UTC vs.
Revision 1.109 by root, Tue Jun 29 16:52:53 2010 UTC