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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.40 by root, Mon Apr 16 15:41:27 2007 UTC vs.
Revision 1.99 by root, Fri Apr 9 02:45:16 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 auto(var,expr) typeof(expr) var = (expr)	58	#define auto(var,expr) decltype(expr) var = (expr)
24		59
25	// very ugly macro that basicaly declares and initialises a variable	60	// very ugly macro that basically declares and initialises a variable
26	// that is in scope for the next statement only	61	// that is in scope for the next statement only
27	// 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
28	// (note: works great for pointers)	63	// (note: works great for pointers)
29	// most ugly macro I ever wrote	64	// most ugly macro I ever wrote
30	#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)
31		66
32	// in range including end	67	// in range including end
33	#define IN_RANGE_INC(val,beg,end) \	68	#define IN_RANGE_INC(val,beg,end) \
34	((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))
35		70
36	// in range excluding end	71	// in range excluding end
37	#define IN_RANGE_EXC(val,beg,end) \	72	#define IN_RANGE_EXC(val,beg,end) \
38	((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))
39		74
		75	void cleanup (const char *cause, bool make_core = false);
40	void fork_abort (const char *msg);	76	void fork_abort (const char *msg);
41		77
42	// 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,
43	// 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.
44	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 (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; }	81	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; }	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; }
47		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
48	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; }
		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
		100	// sign0 returns -1, 0 or +1
		101	template<typename T>
		102	static inline T sign0 (T v) { return v ? sign (v) : 0; }
		103
		104	template<typename T, typename U>
		105	static inline T copysign (T a, U b) { return a > 0 ? b : -b; }
		106
		107	// div* only work correctly for div > 0
		108	// div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
		109	template<typename T> static inline T div (T val, T div)
		110	{
		111	return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
		112	}
		113	// div, round-up
		114	template<typename T> static inline T div_ru (T val, T div)
		115	{
		116	return expect_false (val < 0) ? - ((-val ) / div) : (val + div - 1) / div;
		117	}
		118	// div, round-down
		119	template<typename T> static inline T div_rd (T val, T div)
		120	{
		121	return expect_false (val < 0) ? - ((-val + (div - 1) ) / div) : (val ) / div;
		122	}
		123
		124	// lerp* only work correctly for min_in < max_in
		125	// Linear intERPolate, scales val from min_in..max_in to min_out..max_out
		126	template<typename T>
		127	static inline T
		128	lerp (T val, T min_in, T max_in, T min_out, T max_out)
		129	{
		130	return min_out + div <T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		131	}
		132
		133	// lerp, round-down
		134	template<typename T>
		135	static inline T
		136	lerp_rd (T val, T min_in, T max_in, T min_out, T max_out)
		137	{
		138	return min_out + div_rd<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		139	}
		140
		141	// lerp, round-up
		142	template<typename T>
		143	static inline T
		144	lerp_ru (T val, T min_in, T max_in, T min_out, T max_out)
		145	{
		146	return min_out + div_ru<T> ((val - min_in) * (max_out - min_out), max_in - min_in);
		147	}
49		148
50	// lots of stuff taken from FXT	149	// lots of stuff taken from FXT
51		150
52	/* Rotate right. This is used in various places for checksumming */	151	/* Rotate right. This is used in various places for checksumming */
53	//TODO: that sucks, use a better checksum algo	152	//TODO: that sucks, use a better checksum algo
…		…
90	int32_t d = b - a;	189	int32_t d = b - a;
91	d &= d >> 31;	190	d &= d >> 31;
92	return b - d;	191	return b - d;
93	}	192	}
94		193
95	// this is much faster than crossfires original algorithm	194	// this is much faster than crossfire's original algorithm
96	// on modern cpus	195	// on modern cpus
97	inline int	196	inline int
98	isqrt (int n)	197	isqrt (int n)
99	{	198	{
100	return (int)sqrtf ((float)n);	199	return (int)sqrtf ((float)n);
		200	}
		201
		202	// this is kind of like the ^^ operator, if it would exist, without sequence point.
		203	// more handy than it looks like, due to the implicit !! done on its arguments
		204	inline bool
		205	logical_xor (bool a, bool b)
		206	{
		207	return a != b;
		208	}
		209
		210	inline bool
		211	logical_implies (bool a, bool b)
		212	{
		213	return a <= b;
101	}	214	}
102		215
103	// this is only twice as fast as naive sqrtf (dxdy+dydy)	216	// this is only twice as fast as naive sqrtf (dxdy+dydy)
104	#if 0	217	#if 0
105	// and has a max. error of 6 in the range -100..+100.	218	// and has a max. error of 6 in the range -100..+100.
…		…
130	absdir (int d)	243	absdir (int d)
131	{	244	{
132	return ((d - 1) & 7) + 1;	245	return ((d - 1) & 7) + 1;
133	}	246	}
134		247
		248	// avoid ctz name because netbsd or freebsd spams it's namespace with it
		249	#if GCC_VERSION(3,4)
		250	static inline int least_significant_bit (uint32_t x)
		251	{
		252	return __builtin_ctz (x);
		253	}
		254	#else
		255	int least_significant_bit (uint32_t x);
		256	#endif
		257
		258	#define for_all_bits_sparse_32(mask, idxvar) \
		259	for (uint32_t idxvar, mask_ = mask; \
		260	mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);)
		261
		262	extern ssize_t slice_alloc; // statistics
		263
		264	void *salloc_ (int n) throw (std::bad_alloc);
		265	void salloc_ (int n, void src) throw (std::bad_alloc);
		266
		267	// strictly the same as g_slice_alloc, but never returns 0
		268	template<typename T>
		269	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
		270
		271	// also copies src into the new area, like "memdup"
		272	// if src is 0, clears the memory
		273	template<typename T>
		274	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
		275
		276	// clears the memory
		277	template<typename T>
		278	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
		279
		280	// for symmetry
		281	template<typename T>
		282	inline void sfree (T *ptr, int n = 1) throw ()
		283	{
		284	if (expect_true (ptr))
		285	{
		286	slice_alloc -= n * sizeof (T);
		287	if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
		288	g_slice_free1 (n * sizeof (T), (void *)ptr);
		289	assert (slice_alloc >= 0);//D
		290	}
		291	}
		292
		293	// nulls the pointer
		294	template<typename T>
		295	inline void sfree0 (T *&ptr, int n = 1) throw ()
		296	{
		297	sfree<T> (ptr, n);
		298	ptr = 0;
		299	}
		300
135	// makes dynamically allocated objects zero-initialised	301	// makes dynamically allocated objects zero-initialised
136	struct zero_initialised	302	struct zero_initialised
137	{	303	{
138	void operator new (size_t s, void p)	304	void operator new (size_t s, void p)
139	{	305	{
…		…
141	return p;	307	return p;
142	}	308	}
143		309
144	void *operator new (size_t s)	310	void *operator new (size_t s)
145	{	311	{
146	return g_slice_alloc0 (s);	312	return salloc0<char> (s);
147	}	313	}
148		314
149	void *operator new[] (size_t s)	315	void *operator new[] (size_t s)
150	{	316	{
151	return g_slice_alloc0 (s);	317	return salloc0<char> (s);
152	}	318	}
153		319
154	void operator delete (void *p, size_t s)	320	void operator delete (void *p, size_t s)
155	{	321	{
156	g_slice_free1 (s, p);	322	sfree ((char *)p, s);
157	}	323	}
158		324
159	void operator delete[] (void *p, size_t s)	325	void operator delete[] (void *p, size_t s)
160	{	326	{
161	g_slice_free1 (s, p);	327	sfree ((char *)p, s);
162	}	328	}
163	};	329	};
164		330
165	void *salloc_ (int n) throw (std::bad_alloc);	331	// makes dynamically allocated objects zero-initialised
166	void salloc_ (int n, void src) throw (std::bad_alloc);	332	struct slice_allocated
167
168	// strictly the same as g_slice_alloc, but never returns 0
169	template<typename T>
170	inline T salloc (int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T)); }
171
172	// also copies src into the new area, like "memdup"
173	// if src is 0, clears the memory
174	template<typename T>
175	inline T salloc (int n, T src) throw (std::bad_alloc) { return (T )salloc_ (n sizeof (T), (void *)src); }
176
177	// clears the memory
178	template<typename T>
179	inline T salloc0(int n = 1) throw (std::bad_alloc) { return (T )salloc_ (n * sizeof (T), 0); }
180
181	// for symmetry
182	template<typename T>
183	inline void sfree (T *ptr, int n = 1) throw ()
184	{	333	{
185	#ifdef PREFER_MALLOC	334	void operator new (size_t s, void p)
186	free (ptr);	335	{
187	#else	336	return p;
188	g_slice_free1 (n * sizeof (T), (void *)ptr);	337	}
189	#endif	338
190	}	339	void *operator new (size_t s)
		340	{
		341	return salloc<char> (s);
		342	}
		343
		344	void *operator new[] (size_t s)
		345	{
		346	return salloc<char> (s);
		347	}
		348
		349	void operator delete (void *p, size_t s)
		350	{
		351	sfree ((char *)p, s);
		352	}
		353
		354	void operator delete[] (void *p, size_t s)
		355	{
		356	sfree ((char *)p, s);
		357	}
		358	};
191		359
192	// a STL-compatible allocator that uses g_slice	360	// a STL-compatible allocator that uses g_slice
193	// boy, this is verbose	361	// boy, this is verbose
194	template<typename Tp>	362	template<typename Tp>
195	struct slice_allocator	363	struct slice_allocator
…		…
207	{	375	{
208	typedef slice_allocator<U> other;	376	typedef slice_allocator<U> other;
209	};	377	};
210		378
211	slice_allocator () throw () { }	379	slice_allocator () throw () { }
212	slice_allocator (const slice_allocator &o) throw () { }	380	slice_allocator (const slice_allocator &) throw () { }
213	template<typename Tp2>	381	template<typename Tp2>
214	slice_allocator (const slice_allocator<Tp2> &) throw () { }	382	slice_allocator (const slice_allocator<Tp2> &) throw () { }
215		383
216	~slice_allocator () { }	384	~slice_allocator () { }
217		385
…		…
226	void deallocate (pointer p, size_type n)	394	void deallocate (pointer p, size_type n)
227	{	395	{
228	sfree<Tp> (p, n);	396	sfree<Tp> (p, n);
229	}	397	}
230		398
231	size_type max_size ()const throw ()	399	size_type max_size () const throw ()
232	{	400	{
233	return size_t (-1) / sizeof (Tp);	401	return size_t (-1) / sizeof (Tp);
234	}	402	}
235		403
236	void construct (pointer p, const Tp &val)	404	void construct (pointer p, const Tp &val)
…		…
247	// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.	415	// P. L'Ecuyer, “Maximally Equidistributed Combined Tausworthe Generators”, Mathematics of Computation, 65, 213 (1996), 203–213.
248	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps	416	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps
249	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps	417	// http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps
250	struct tausworthe_random_generator	418	struct tausworthe_random_generator
251	{	419	{
252	// generator
253	uint32_t state [4];	420	uint32_t state [4];
254		421
255	void operator =(const tausworthe_random_generator &src)	422	void operator =(const tausworthe_random_generator &src)
256	{	423	{
257	state [0] = src.state [0];	424	state [0] = src.state [0];
…		…
260	state [3] = src.state [3];	427	state [3] = src.state [3];
261	}	428	}
262		429
263	void seed (uint32_t seed);	430	void seed (uint32_t seed);
264	uint32_t next ();	431	uint32_t next ();
		432	};
265		433
266	// uniform distribution	434	// Xorshift RNGs, George Marsaglia
		435	// http://www.jstatsoft.org/v08/i14/paper
		436	// this one is about 40% faster than the tausworthe one above (i.e. not much),
		437	// despite the inlining, and has the issue of only creating 2**32-1 numbers.
		438	// see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf
		439	struct xorshift_random_generator
		440	{
		441	uint32_t x, y;
		442
		443	void operator =(const xorshift_random_generator &src)
		444	{
		445	x = src.x;
		446	y = src.y;
		447	}
		448
		449	void seed (uint32_t seed)
		450	{
		451	x = seed;
		452	y = seed * 69069U;
		453	}
		454
		455	uint32_t next ()
		456	{
		457	uint32_t t = x ^ (x << 10);
		458	x = y;
		459	y = y ^ (y >> 13) ^ t ^ (t >> 10);
		460	return y;
		461	}
		462	};
		463
		464	template<class generator>
		465	struct random_number_generator : generator
		466	{
		467	// uniform distribution, 0 .. max (0, num - 1)
267	uint32_t operator ()(uint32_t r_max)	468	uint32_t operator ()(uint32_t num)
268	{	469	{
269	return is_constant (r_max)	470	return !is_constant (num) ? get_range (num) // non-constant
270	? this->next () % r_max	471	: num & (num - 1) ? (this->next () * (uint64_t)num) >> 32U // constant, non-power-of-two
271	: get_range (r_max);	472	: this->next () & (num - 1); // constant, power-of-two
272	}	473	}
273		474
274	// return a number within (min .. max)	475	// return a number within (min .. max)
275	int operator () (int r_min, int r_max)	476	int operator () (int r_min, int r_max)
276	{	477	{
277	return is_constant (r_min) && is_constant (r_max)	478	return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
278	? r_min + (*this) (max (r_max - r_min + 1, 1))	479	? r_min + operator ()(r_max - r_min + 1)
279	: get_range (r_min, r_max);	480	: get_range (r_min, r_max);
280	}	481	}
281		482
282	double operator ()()	483	double operator ()()
283	{	484	{
…		…
287	protected:	488	protected:
288	uint32_t get_range (uint32_t r_max);	489	uint32_t get_range (uint32_t r_max);
289	int get_range (int r_min, int r_max);	490	int get_range (int r_min, int r_max);
290	};	491	};
291		492
292	typedef tausworthe_random_generator rand_gen;	493	typedef random_number_generator<tausworthe_random_generator> rand_gen;
293		494
294	extern rand_gen rndm;	495	extern rand_gen rndm, rmg_rndm;
		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;
295		511
296	template<class T>	512	template<class T>
297	struct refptr	513	struct refptr
298	{	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 (!is_constant (p))
		521	--*refcnt_ref ();
		522	else if (p)
		523	--p->refcnt;
		524	}
		525
		526	void refcnt_inc ()
		527	{
		528	if (!is_constant (p))
		529	++*refcnt_ref ();
		530	else if (p)
		531	++p->refcnt;
		532	}
		533
299	T *p;	534	T *p;
300		535
301	refptr () : p(0) { }	536	refptr () : p(0) { }
302	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	537	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
303	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	538	refptr (T *p) : p(p) { refcnt_inc (); }
304	~refptr () { if (p) p->refcnt_dec (); }	539	~refptr () { refcnt_dec (); }
305		540
306	const refptr<T> &operator =(T *o)	541	const refptr<T> &operator =(T *o)
307	{	542	{
		543	// if decrementing ever destroys we need to reverse the order here
308	if (p) p->refcnt_dec ();	544	refcnt_dec ();
309	p = o;	545	p = o;
310	if (p) p->refcnt_inc ();	546	refcnt_inc ();
311
312	return *this;	547	return *this;
313	}	548	}
314		549
315	const refptr<T> &operator =(const refptr<T> o)	550	const refptr<T> &operator =(const refptr<T> &o)
316	{	551	{
317	*this = o.p;	552	*this = o.p;
318	return *this;	553	return *this;
319	}	554	}
320		555
321	T &operator * () const { return *p; }	556	T &operator * () const { return *p; }
322	T *operator ->() const { return p; }	557	T *operator ->() const { return p; }
323		558
324	operator T *() const { return p; }	559	operator T *() const { return p; }
325	};	560	};
326		561
327	typedef refptr<maptile> maptile_ptr;	562	typedef refptr<maptile> maptile_ptr;
328	typedef refptr<object> object_ptr;	563	typedef refptr<object> object_ptr;
329	typedef refptr<archetype> arch_ptr;	564	typedef refptr<archetype> arch_ptr;
330	typedef refptr<client> client_ptr;	565	typedef refptr<client> client_ptr;
331	typedef refptr<player> player_ptr;	566	typedef refptr<player> player_ptr;
332		567
		568	#define STRHSH_NULL 2166136261
		569
		570	static inline uint32_t
		571	strhsh (const char *s)
		572	{
		573	// use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
		574	// it is about twice as fast as the one-at-a-time one,
		575	// with good distribution.
		576	// FNV-1a is faster on many cpus because the multiplication
		577	// runs concurrently with the looping logic.
		578	uint32_t hash = STRHSH_NULL;
		579
		580	while (*s)
		581	hash = (hash ^ s++) 16777619U;
		582
		583	return hash;
		584	}
		585
		586	static inline uint32_t
		587	memhsh (const char *s, size_t len)
		588	{
		589	uint32_t hash = STRHSH_NULL;
		590
		591	while (len--)
		592	hash = (hash ^ s++) 16777619U;
		593
		594	return hash;
		595	}
		596
333	struct str_hash	597	struct str_hash
334	{	598	{
335	std::size_t operator ()(const char *s) const	599	std::size_t operator ()(const char *s) const
336	{	600	{
337	unsigned long hash = 0;
338
339	/* use the one-at-a-time hash function, which supposedly is
340	* better than the djb2-like one used by perl5.005, but
341	* certainly is better then the bug used here before.
342	* see http://burtleburtle.net/bob/hash/doobs.html
343	*/
344	while (*s)
345	{
346	hash += *s++;
347	hash += hash << 10;
348	hash ^= hash >> 6;
349	}
350
351	hash += hash << 3;
352	hash ^= hash >> 11;
353	hash += hash << 15;
354
355	return hash;	601	return strhsh (s);
		602	}
		603
		604	std::size_t operator ()(const shstr &s) const
		605	{
		606	return strhsh (s);
356	}	607	}
357	};	608	};
358		609
359	struct str_equal	610	struct str_equal
360	{	611	{
…		…
362	{	613	{
363	return !strcmp (a, b);	614	return !strcmp (a, b);
364	}	615	}
365	};	616	};
366		617
		618	// Mostly the same as std::vector, but insert/erase can reorder
		619	// the elements, making append(=insert)/remove O(1) instead of O(n).
		620	//
		621	// NOTE: only some forms of erase are available
367	template<class T>	622	template<class T>
368	struct unordered_vector : std::vector<T, slice_allocator<T> >	623	struct unordered_vector : std::vector<T, slice_allocator<T> >
369	{	624	{
370	typedef typename unordered_vector::iterator iterator;	625	typedef typename unordered_vector::iterator iterator;
371		626
…		…
381	{	636	{
382	erase ((unsigned int )(i - this->begin ()));	637	erase ((unsigned int )(i - this->begin ()));
383	}	638	}
384	};	639	};
385		640
386	template<class T, int T::* index>	641	// This container blends advantages of linked lists
		642	// (efficiency) with vectors (random access) by
		643	// by using an unordered vector and storing the vector
		644	// index inside the object.
		645	//
		646	// + memory-efficient on most 64 bit archs
		647	// + O(1) insert/remove
		648	// + free unique (but varying) id for inserted objects
		649	// + cache-friendly iteration
		650	// - only works for pointers to structs
		651	//
		652	// NOTE: only some forms of erase/insert are available
		653	typedef int object_vector_index;
		654
		655	template<class T, object_vector_index T::*indexmember>
387	struct object_vector : std::vector<T , slice_allocator<T > >	656	struct object_vector : std::vector<T , slice_allocator<T > >
388	{	657	{
		658	typedef typename object_vector::iterator iterator;
		659
		660	bool contains (const T *obj) const
		661	{
		662	return obj->*indexmember;
		663	}
		664
		665	iterator find (const T *obj)
		666	{
		667	return obj->*indexmember
		668	? this->begin () + obj->*indexmember - 1
		669	: this->end ();
		670	}
		671
		672	void push_back (T *obj)
		673	{
		674	std::vector<T , slice_allocator<T > >::push_back (obj);
		675	obj->*indexmember = this->size ();
		676	}
		677
389	void insert (T *obj)	678	void insert (T *obj)
390	{	679	{
391	assert (!(obj->*index));
392	push_back (obj);	680	push_back (obj);
393	obj->*index = this->size ();
394	}	681	}
395		682
396	void insert (T &obj)	683	void insert (T &obj)
397	{	684	{
398	insert (&obj);	685	insert (&obj);
399	}	686	}
400		687
401	void erase (T *obj)	688	void erase (T *obj)
402	{	689	{
403	assert (obj->*index);
404	unsigned int pos = obj->*index;	690	unsigned int pos = obj->*indexmember;
405	obj->*index = 0;	691	obj->*indexmember = 0;
406		692
407	if (pos < this->size ())	693	if (pos < this->size ())
408	{	694	{
409	(this)[pos - 1] = (this)[this->size () - 1];	695	(this)[pos - 1] = (this)[this->size () - 1];
410	(this)[pos - 1]->index = pos;	696	(this)[pos - 1]->indexmember = pos;
411	}	697	}
412		698
413	this->pop_back ();	699	this->pop_back ();
414	}	700	}
415		701
416	void erase (T &obj)	702	void erase (T &obj)
417	{	703	{
418	errase (&obj);	704	erase (&obj);
419	}	705	}
420	};	706	};
421		707
422	// basically does what strncpy should do, but appends "..." to strings exceeding length	708	// basically does what strncpy should do, but appends "..." to strings exceeding length
		709	// returns the number of bytes actually used (including \0)
423	void assign (char dst, const char src, int maxlen);	710	int assign (char dst, const char src, int maxsize);
424		711
425	// type-safe version of assign	712	// type-safe version of assign
426	template<int N>	713	template<int N>
427	inline void assign (char (&dst)[N], const char *src)	714	inline int assign (char (&dst)[N], const char *src)
428	{	715	{
429	assign ((char *)&dst, src, N);	716	return assign ((char *)&dst, src, N);
430	}	717	}
431		718
432	typedef double tstamp;	719	typedef double tstamp;
433		720
434	// return current time as timestampe	721	// return current time as timestamp
435	tstamp now ();	722	tstamp now ();
436		723
437	int similar_direction (int a, int b);	724	int similar_direction (int a, int b);
438		725
		726	// like v?sprintf, but returns a "static" buffer
		727	char vformat (const char format, va_list ap);
		728	char format (const char format, ...) attribute ((format (printf, 1, 2)));
		729
		730	// safety-check player input which will become object->msg
		731	bool msg_is_safe (const char *msg);
		732
		733	/////////////////////////////////////////////////////////////////////////////
		734	// threads, very very thin wrappers around pthreads
		735
		736	struct thread
		737	{
		738	pthread_t id;
		739
		740	void start (void (start_routine)(void ), void arg = 0);
		741
		742	void cancel ()
		743	{
		744	pthread_cancel (id);
		745	}
		746
		747	void *join ()
		748	{
		749	void *ret;
		750
		751	if (pthread_join (id, &ret))
		752	cleanup ("pthread_join failed", 1);
		753
		754	return ret;
		755	}
		756	};
		757
		758	// note that mutexes are not classes
		759	typedef pthread_mutex_t smutex;
		760
		761	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		762	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		763	#else
		764	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
439	#endif	765	#endif
440		766
		767	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		768	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		769	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		770
		771	typedef pthread_cond_t scond;
		772
		773	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		774	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		775	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		776	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		777
		778	#endif
		779

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Comparing deliantra/server/include/util.h (file contents): Revision 1.40 by root, Mon Apr 16 15:41:27 2007 UTC vs. Revision 1.99 by root, Fri Apr 9 02:45:16 2010 UTC

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Comparing deliantra/server/include/util.h (file contents):
Revision 1.40 by root, Mon Apr 16 15:41:27 2007 UTC vs.
Revision 1.99 by root, Fri Apr 9 02:45:16 2010 UTC