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

Comparing deliantra/server/include/util.h (file contents):
Revision 1.34 by root, Fri Jan 19 15:15:50 2007 UTC vs.
Revision 1.71 by root, Sun Apr 20 06:20:38 2008 UTC

…		…
		1	/*
		2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
		3	*
		4	* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
		5	*
		6	* Deliantra is free software: you can redistribute it and/or modify
		7	* it under the terms of the GNU General Public License as published by
		8	* the Free Software Foundation, either version 3 of the License, or
		9	* (at your 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 GNU General Public License
		17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
		18	*
		19	* The authors can be reached via e-mail to <support@deliantra.net>
		20	*/
		21
1	#ifndef UTIL_H__	22	#ifndef UTIL_H__
2	#define UTIL_H__	23	#define UTIL_H__
3		24
		25	#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0
		26	#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs
		27	#define PREFER_MALLOC 0 // use malloc and not the slice allocator
		28
4	#if __GNUC__ >= 3	29	#if __GNUC__ >= 3
5	# define is_constant(c) __builtin_constant_p (c)	30	# define is_constant(c) __builtin_constant_p (c)
		31	# define expect(expr,value) __builtin_expect ((expr),(value))
		32	# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
6	#else	33	#else
7	# define is_constant(c) 0	34	# define is_constant(c) 0
		35	# define expect(expr,value) (expr)
		36	# define prefetch(addr,rw,locality)
8	#endif	37	#endif
		38
		39	#if __GNUC__ < 4 \|\| (__GNUC__ == 4 \|\| __GNUC_MINOR__ < 4)
		40	# define decltype(x) typeof(x)
		41	#endif
		42
		43	// put into ifs if you are very sure that the expression
		44	// is mostly true or mosty false. note that these return
		45	// booleans, not the expression.
		46	#define expect_false(expr) expect ((expr) != 0, 0)
		47	#define expect_true(expr) expect ((expr) != 0, 1)
		48
		49	#include <pthread.h>
9		50
10	#include <cstddef>	51	#include <cstddef>
11	#include <cmath>	52	#include <cmath>
12	#include <new>	53	#include <new>
13	#include <vector>	54	#include <vector>
15	#include <glib.h>	56	#include <glib.h>
16		57
17	#include <shstr.h>	58	#include <shstr.h>
18	#include <traits.h>	59	#include <traits.h>
19		60
		61	#if DEBUG_SALLOC
		62	# define g_slice_alloc0(s) debug_slice_alloc0(s)
		63	# define g_slice_alloc(s) debug_slice_alloc(s)
		64	# define g_slice_free1(s,p) debug_slice_free1(s,p)
		65	void *g_slice_alloc (unsigned long size);
		66	void *g_slice_alloc0 (unsigned long size);
		67	void g_slice_free1 (unsigned long size, void *ptr);
		68	#elif PREFER_MALLOC
		69	# define g_slice_alloc0(s) calloc (1, (s))
		70	# define g_slice_alloc(s) malloc ((s))
		71	# define g_slice_free1(s,p) free ((p))
		72	#endif
		73
20	// use a gcc extension for auto declarations until ISO C++ sanctifies them	74	// use C0X decltype for auto declarations until ISO C++ sanctifies them (if ever)
21	#define AUTODECL(var,expr) typeof(expr) var = (expr)	75	#define auto(var,expr) decltype(expr) var = (expr)
22		76
23	// very ugly macro that basicaly declares and initialises a variable	77	// very ugly macro that basicaly declares and initialises a variable
24	// that is in scope for the next statement only	78	// that is in scope for the next statement only
25	// works only for stuff that can be assigned 0 and converts to false	79	// works only for stuff that can be assigned 0 and converts to false
26	// (note: works great for pointers)	80	// (note: works great for pointers)
27	// most ugly macro I ever wrote	81	// most ugly macro I ever wrote
28	#define declvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)	82	#define statementvar(type, name, value) if (type name = 0) { } else if (((name) = (value)), 1)
29		83
30	// in range including end	84	// in range including end
31	#define IN_RANGE_INC(val,beg,end) \	85	#define IN_RANGE_INC(val,beg,end) \
32	((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))	86	((unsigned int)(val) - (unsigned int)(beg) <= (unsigned int)(end) - (unsigned int)(beg))
33		87
34	// in range excluding end	88	// in range excluding end
35	#define IN_RANGE_EXC(val,beg,end) \	89	#define IN_RANGE_EXC(val,beg,end) \
36	((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))	90	((unsigned int)(val) - (unsigned int)(beg) < (unsigned int)(end) - (unsigned int)(beg))
37		91
		92	void cleanup (const char *cause, bool make_core = false);
38	void fork_abort (const char *msg);	93	void fork_abort (const char *msg);
39		94
		95	// rationale for using (U) not (T) is to reduce signed/unsigned issues,
		96	// as a is often a constant while b is the variable. it is still a bug, though.
40	template<typename T, typename U> static inline T min (T a, U b) { return a < (T)b ? a : (T)b; }	97	template<typename T, typename U> static inline T min (T a, U b) { return (U)a < b ? (U)a : b; }
41	template<typename T, typename U> static inline T max (T a, U b) { return a > (T)b ? a : (T)b; }	98	template<typename T, typename U> static inline T max (T a, U b) { return (U)a > b ? (U)a : b; }
42	template<typename T, typename U, typename V> static inline T clamp (T v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; }	99	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; }
43		100
44	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }	101	template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
		102
		103	template<typename T, typename U, typename V> static inline T min (T a, U b, V c) { return min (a, min (b, c)); }
		104	template<typename T, typename U, typename V> static inline T max (T a, U b, V c) { return max (a, max (b, c)); }
		105
		106	template<typename T>
		107	static inline T
		108	lerp (T val, T min_in, T max_in, T min_out, T max_out)
		109	{
		110	return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out;
		111	}
		112
		113	// lots of stuff taken from FXT
		114
		115	/* Rotate right. This is used in various places for checksumming */
		116	//TODO: that sucks, use a better checksum algo
		117	static inline uint32_t
		118	rotate_right (uint32_t c, uint32_t count = 1)
		119	{
		120	return (c << (32 - count)) \| (c >> count);
		121	}
		122
		123	static inline uint32_t
		124	rotate_left (uint32_t c, uint32_t count = 1)
		125	{
		126	return (c >> (32 - count)) \| (c << count);
		127	}
		128
		129	// Return abs(a-b)
		130	// Both a and b must not have the most significant bit set
		131	static inline uint32_t
		132	upos_abs_diff (uint32_t a, uint32_t b)
		133	{
		134	long d1 = b - a;
		135	long d2 = (d1 & (d1 >> 31)) << 1;
		136
		137	return d1 - d2; // == (b - d) - (a + d);
		138	}
		139
		140	// Both a and b must not have the most significant bit set
		141	static inline uint32_t
		142	upos_min (uint32_t a, uint32_t b)
		143	{
		144	int32_t d = b - a;
		145	d &= d >> 31;
		146	return a + d;
		147	}
		148
		149	// Both a and b must not have the most significant bit set
		150	static inline uint32_t
		151	upos_max (uint32_t a, uint32_t b)
		152	{
		153	int32_t d = b - a;
		154	d &= d >> 31;
		155	return b - d;
		156	}
45		157
46	// this is much faster than crossfires original algorithm	158	// this is much faster than crossfires original algorithm
47	// on modern cpus	159	// on modern cpus
48	inline int	160	inline int
49	isqrt (int n)	161	isqrt (int n)
…		…
81	absdir (int d)	193	absdir (int d)
82	{	194	{
83	return ((d - 1) & 7) + 1;	195	return ((d - 1) & 7) + 1;
84	}	196	}
85		197
86	// makes dynamically allocated objects zero-initialised	198	extern ssize_t slice_alloc; // statistics
87	struct zero_initialised
88	{
89	void operator new (size_t s, void p)
90	{
91	memset (p, 0, s);
92	return p;
93	}
94
95	void *operator new (size_t s)
96	{
97	return g_slice_alloc0 (s);
98	}
99
100	void *operator new[] (size_t s)
101	{
102	return g_slice_alloc0 (s);
103	}
104
105	void operator delete (void *p, size_t s)
106	{
107	g_slice_free1 (s, p);
108	}
109
110	void operator delete[] (void *p, size_t s)
111	{
112	g_slice_free1 (s, p);
113	}
114	};
115		199
116	void *salloc_ (int n) throw (std::bad_alloc);	200	void *salloc_ (int n) throw (std::bad_alloc);
117	void salloc_ (int n, void src) throw (std::bad_alloc);	201	void salloc_ (int n, void src) throw (std::bad_alloc);
118		202
119	// strictly the same as g_slice_alloc, but never returns 0	203	// strictly the same as g_slice_alloc, but never returns 0
…		…
131		215
132	// for symmetry	216	// for symmetry
133	template<typename T>	217	template<typename T>
134	inline void sfree (T *ptr, int n = 1) throw ()	218	inline void sfree (T *ptr, int n = 1) throw ()
135	{	219	{
		220	if (expect_true (ptr))
		221	{
		222	slice_alloc -= n * sizeof (T);
		223	if (DEBUG_POISON) memset (ptr, DEBUG_POISON, n * sizeof (T));
136	g_slice_free1 (n * sizeof (T), (void *)ptr);	224	g_slice_free1 (n * sizeof (T), (void *)ptr);
		225	assert (slice_alloc >= 0);//D
		226	}
137	}	227	}
		228
		229	// makes dynamically allocated objects zero-initialised
		230	struct zero_initialised
		231	{
		232	void operator new (size_t s, void p)
		233	{
		234	memset (p, 0, s);
		235	return p;
		236	}
		237
		238	void *operator new (size_t s)
		239	{
		240	return salloc0<char> (s);
		241	}
		242
		243	void *operator new[] (size_t s)
		244	{
		245	return salloc0<char> (s);
		246	}
		247
		248	void operator delete (void *p, size_t s)
		249	{
		250	sfree ((char *)p, s);
		251	}
		252
		253	void operator delete[] (void *p, size_t s)
		254	{
		255	sfree ((char *)p, s);
		256	}
		257	};
138		258
139	// a STL-compatible allocator that uses g_slice	259	// a STL-compatible allocator that uses g_slice
140	// boy, this is verbose	260	// boy, this is verbose
141	template<typename Tp>	261	template<typename Tp>
142	struct slice_allocator	262	struct slice_allocator
…		…
154	{	274	{
155	typedef slice_allocator<U> other;	275	typedef slice_allocator<U> other;
156	};	276	};
157		277
158	slice_allocator () throw () { }	278	slice_allocator () throw () { }
159	slice_allocator (const slice_allocator &o) throw () { }	279	slice_allocator (const slice_allocator &) throw () { }
160	template<typename Tp2>	280	template<typename Tp2>
161	slice_allocator (const slice_allocator<Tp2> &) throw () { }	281	slice_allocator (const slice_allocator<Tp2> &) throw () { }
162		282
163	~slice_allocator () { }	283	~slice_allocator () { }
164		284
…		…
173	void deallocate (pointer p, size_type n)	293	void deallocate (pointer p, size_type n)
174	{	294	{
175	sfree<Tp> (p, n);	295	sfree<Tp> (p, n);
176	}	296	}
177		297
178	size_type max_size ()const throw ()	298	size_type max_size () const throw ()
179	{	299	{
180	return size_t (-1) / sizeof (Tp);	300	return size_t (-1) / sizeof (Tp);
181	}	301	}
182		302
183	void construct (pointer p, const Tp &val)	303	void construct (pointer p, const Tp &val)
…		…
209		329
210	void seed (uint32_t seed);	330	void seed (uint32_t seed);
211	uint32_t next ();	331	uint32_t next ();
212		332
213	// uniform distribution	333	// uniform distribution
214	uint32_t operator ()(uint32_t r_max)	334	uint32_t operator ()(uint32_t num)
215	{	335	{
216	return is_constant (r_max)	336	return is_constant (num)
217	? this->next () % r_max	337	? (next () * (uint64_t)num) >> 32U
218	: get_range (r_max);	338	: get_range (num);
219	}	339	}
220		340
221	// return a number within (min .. max)	341	// return a number within (min .. max)
222	int operator () (int r_min, int r_max)	342	int operator () (int r_min, int r_max)
223	{	343	{
224	return is_constant (r_min) && is_constant (r_max)	344	return is_constant (r_min) && is_constant (r_max) && r_min <= r_max
225	? r_min + (*this) (max (r_max - r_min + 1, 1))	345	? r_min + operator ()(r_max - r_min + 1)
226	: get_range (r_min, r_max);	346	: get_range (r_min, r_max);
227	}	347	}
228		348
229	double operator ()()	349	double operator ()()
230	{	350	{
…		…
238		358
239	typedef tausworthe_random_generator rand_gen;	359	typedef tausworthe_random_generator rand_gen;
240		360
241	extern rand_gen rndm;	361	extern rand_gen rndm;
242		362
		363	INTERFACE_CLASS (attachable)
		364	struct refcnt_base
		365	{
		366	typedef int refcnt_t;
		367	mutable refcnt_t ACC (RW, refcnt);
		368
		369	MTH void refcnt_inc () const { ++refcnt; }
		370	MTH void refcnt_dec () const { --refcnt; }
		371
		372	refcnt_base () : refcnt (0) { }
		373	};
		374
		375	// to avoid branches with more advanced compilers
		376	extern refcnt_base::refcnt_t refcnt_dummy;
		377
243	template<class T>	378	template<class T>
244	struct refptr	379	struct refptr
245	{	380	{
		381	// p if not null
		382	refcnt_base::refcnt_t *refcnt_ref () { return p ? &p->refcnt : &refcnt_dummy; }
		383
		384	void refcnt_dec ()
		385	{
		386	if (!is_constant (p))
		387	--*refcnt_ref ();
		388	else if (p)
		389	--p->refcnt;
		390	}
		391
		392	void refcnt_inc ()
		393	{
		394	if (!is_constant (p))
		395	++*refcnt_ref ();
		396	else if (p)
		397	++p->refcnt;
		398	}
		399
246	T *p;	400	T *p;
247		401
248	refptr () : p(0) { }	402	refptr () : p(0) { }
249	refptr (const refptr<T> &p) : p(p.p) { if (p) p->refcnt_inc (); }	403	refptr (const refptr<T> &p) : p(p.p) { refcnt_inc (); }
250	refptr (T *p) : p(p) { if (p) p->refcnt_inc (); }	404	refptr (T *p) : p(p) { refcnt_inc (); }
251	~refptr () { if (p) p->refcnt_dec (); }	405	~refptr () { refcnt_dec (); }
252		406
253	const refptr<T> &operator =(T *o)	407	const refptr<T> &operator =(T *o)
254	{	408	{
		409	// if decrementing ever destroys we need to reverse the order here
255	if (p) p->refcnt_dec ();	410	refcnt_dec ();
256	p = o;	411	p = o;
257	if (p) p->refcnt_inc ();	412	refcnt_inc ();
258
259	return *this;	413	return *this;
260	}	414	}
261		415
262	const refptr<T> &operator =(const refptr<T> o)	416	const refptr<T> &operator =(const refptr<T> &o)
263	{	417	{
264	*this = o.p;	418	*this = o.p;
265	return *this;	419	return *this;
266	}	420	}
267		421
268	T &operator * () const { return *p; }	422	T &operator * () const { return *p; }
269	T *operator ->() const { return p; }	423	T *operator ->() const { return p; }
270		424
271	operator T *() const { return p; }	425	operator T *() const { return p; }
272	};	426	};
273		427
274	typedef refptr<maptile> maptile_ptr;	428	typedef refptr<maptile> maptile_ptr;
…		…
309	{	463	{
310	return !strcmp (a, b);	464	return !strcmp (a, b);
311	}	465	}
312	};	466	};
313		467
		468	// Mostly the same as std::vector, but insert/erase can reorder
		469	// the elements, making append(=insert)/remove O(1) instead of O(n).
		470	//
		471	// NOTE: only some forms of erase are available
314	template<class T>	472	template<class T>
315	struct unordered_vector : std::vector<T, slice_allocator<T> >	473	struct unordered_vector : std::vector<T, slice_allocator<T> >
316	{	474	{
317	typedef typename unordered_vector::iterator iterator;	475	typedef typename unordered_vector::iterator iterator;
318		476
…		…
328	{	486	{
329	erase ((unsigned int )(i - this->begin ()));	487	erase ((unsigned int )(i - this->begin ()));
330	}	488	}
331	};	489	};
332		490
333	template<class T, int T::* index>	491	// This container blends advantages of linked lists
		492	// (efficiency) with vectors (random access) by
		493	// by using an unordered vector and storing the vector
		494	// index inside the object.
		495	//
		496	// + memory-efficient on most 64 bit archs
		497	// + O(1) insert/remove
		498	// + free unique (but varying) id for inserted objects
		499	// + cache-friendly iteration
		500	// - only works for pointers to structs
		501	//
		502	// NOTE: only some forms of erase/insert are available
		503	typedef int object_vector_index;
		504
		505	template<class T, object_vector_index T::*indexmember>
334	struct object_vector : std::vector<T , slice_allocator<T > >	506	struct object_vector : std::vector<T , slice_allocator<T > >
335	{	507	{
		508	typedef typename object_vector::iterator iterator;
		509
		510	bool contains (const T *obj) const
		511	{
		512	return obj->*indexmember;
		513	}
		514
		515	iterator find (const T *obj)
		516	{
		517	return obj->*indexmember
		518	? this->begin () + obj->*indexmember - 1
		519	: this->end ();
		520	}
		521
		522	void push_back (T *obj)
		523	{
		524	std::vector<T , slice_allocator<T > >::push_back (obj);
		525	obj->*indexmember = this->size ();
		526	}
		527
336	void insert (T *obj)	528	void insert (T *obj)
337	{	529	{
338	assert (!(obj->*index));
339	push_back (obj);	530	push_back (obj);
340	obj->*index = this->size ();
341	}	531	}
342		532
343	void insert (T &obj)	533	void insert (T &obj)
344	{	534	{
345	insert (&obj);	535	insert (&obj);
346	}	536	}
347		537
348	void erase (T *obj)	538	void erase (T *obj)
349	{	539	{
350	assert (obj->*index);
351	int pos = obj->*index;	540	unsigned int pos = obj->*indexmember;
352	obj->*index = 0;	541	obj->*indexmember = 0;
353		542
354	if (pos < this->size ())	543	if (pos < this->size ())
355	{	544	{
356	(this)[pos - 1] = (this)[this->size () - 1];	545	(this)[pos - 1] = (this)[this->size () - 1];
357	(this)[pos - 1]->index = pos;	546	(this)[pos - 1]->indexmember = pos;
358	}	547	}
359		548
360	this->pop_back ();	549	this->pop_back ();
361	}	550	}
362		551
363	void erase (T &obj)	552	void erase (T &obj)
364	{	553	{
365	errase (&obj);	554	erase (&obj);
366	}	555	}
367	};	556	};
368		557
369	// basically does what strncpy should do, but appends "..." to strings exceeding length	558	// basically does what strncpy should do, but appends "..." to strings exceeding length
370	void assign (char dst, const char src, int maxlen);	559	void assign (char dst, const char src, int maxlen);
…		…
376	assign ((char *)&dst, src, N);	565	assign ((char *)&dst, src, N);
377	}	566	}
378		567
379	typedef double tstamp;	568	typedef double tstamp;
380		569
381	// return current time as timestampe	570	// return current time as timestamp
382	tstamp now ();	571	tstamp now ();
383		572
384	int similar_direction (int a, int b);	573	int similar_direction (int a, int b);
385		574
		575	// like sprintf, but returns a "static" buffer
		576	const char format (const char format, ...);
		577
		578	/////////////////////////////////////////////////////////////////////////////
		579	// threads, very very thin wrappers around pthreads
		580
		581	struct thread
		582	{
		583	pthread_t id;
		584
		585	void start (void (start_routine)(void ), void arg = 0);
		586
		587	void cancel ()
		588	{
		589	pthread_cancel (id);
		590	}
		591
		592	void *join ()
		593	{
		594	void *ret;
		595
		596	if (pthread_join (id, &ret))
		597	cleanup ("pthread_join failed", 1);
		598
		599	return ret;
		600	}
		601	};
		602
		603	// note that mutexes are not classes
		604	typedef pthread_mutex_t smutex;
		605
		606	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		607	#define SMUTEX_INITIALISER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		608	#else
		609	#define SMUTEX_INITIALISER PTHREAD_MUTEX_INITIALIZER
386	#endif	610	#endif
387		611
		612	#define SMUTEX(name) smutex name = SMUTEX_INITIALISER
		613	#define SMUTEX_LOCK(name) pthread_mutex_lock (&(name))
		614	#define SMUTEX_UNLOCK(name) pthread_mutex_unlock (&(name))
		615
		616	typedef pthread_cond_t scond;
		617
		618	#define SCOND(name) scond name = PTHREAD_COND_INITIALIZER
		619	#define SCOND_SIGNAL(name) pthread_cond_signal (&(name))
		620	#define SCOND_BROADCAST(name) pthread_cond_broadcast (&(name))
		621	#define SCOND_WAIT(name,mutex) pthread_cond_wait (&(name), &(mutex))
		622
		623	#endif
		624

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Comparing deliantra/server/include/util.h (file contents): Revision 1.34 by root, Fri Jan 19 15:15:50 2007 UTC vs. Revision 1.71 by root, Sun Apr 20 06:20:38 2008 UTC

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Comparing deliantra/server/include/util.h (file contents):
Revision 1.34 by root, Fri Jan 19 15:15:50 2007 UTC vs.
Revision 1.71 by root, Sun Apr 20 06:20:38 2008 UTC