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stdlib.hfa @ ffac259

Last change on this file since ffac259 was 24d6572, checked in by Fangren Yu <f37yu@…>, 17 months ago
Merge branch 'master' into ast-experimental
Property mode set to `100644`
File size: 20.3 KB

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1	//
2	// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
3	//
4	// The contents of this file are covered under the licence agreement in the
5	// file "LICENCE" distributed with Cforall.
6	//
7	// stdlib --
8	//
9	// Author : Peter A. Buhr
10	// Created On : Thu Jan 28 17:12:35 2016
11	// Last Modified By : Peter A. Buhr
12	// Last Modified On : Thu Feb 2 11:30:04 2023
13	// Update Count : 766
14	//
15
16	#pragma once
17
18	#include "bits/defs.hfa" // OPTIONAL_THREAD
19	#include "bits/align.hfa" // libAlign
20	#include "bits/random.hfa" // prng
21
22	#include <stdlib.h> // alloc, strto, ato*
23	#include <heap.hfa>
24
25
26	// Reduce includes by explicitly defining these routines.
27	extern "C" {
28	void * memalign( size_t alignment, size_t size ); // malloc.h
29	void * pvalloc( size_t size ); // malloc.h
30	void * memset( void * dest, int fill, size_t size ); // string.h
31	void * memcpy( void * dest, const void * src, size_t size ); // string.h
32	} // extern "C"
33
34	//---------------------------------------
35
36	#ifndef EXIT_FAILURE
37	#define EXIT_FAILURE 1 // failing exit status
38	#define EXIT_SUCCESS 0 // successful exit status
39	#endif // ! EXIT_FAILURE
40
41	//---------------------------------------
42
43	#include "common.hfa"
44
45	//---------------------------------------
46
47	static inline forall( T & \| sized(T) ) {
48	// CFA safe equivalents, i.e., implicit size specification
49
50	T * malloc( void ) {
51	if ( _Alignof(T) <= libAlign() ) return (T *)malloc( sizeof(T) ); // C allocation
52	else return (T *)memalign( _Alignof(T), sizeof(T) );
53	} // malloc
54
55	T * aalloc( size_t dim ) {
56	if ( _Alignof(T) <= libAlign() ) return (T *)aalloc( dim, sizeof(T) ); // C allocation
57	else return (T *)amemalign( _Alignof(T), dim, sizeof(T) );
58	} // aalloc
59
60	T * calloc( size_t dim ) {
61	if ( _Alignof(T) <= libAlign() ) return (T *)calloc( dim, sizeof(T) ); // C allocation
62	else return (T *)cmemalign( _Alignof(T), dim, sizeof(T) );
63	} // calloc
64
65	T * resize( T * ptr, size_t size ) { // CFA resize, eliminate return-type cast
66	if ( _Alignof(T) <= libAlign() ) return (T )resize( (void )ptr, size ); // CFA resize
67	else return (T )resize( (void )ptr, _Alignof(T), size ); // CFA resize
68	} // resize
69
70	T * realloc( T * ptr, size_t size ) { // CFA realloc, eliminate return-type cast
71	if ( _Alignof(T) <= libAlign() ) return (T )realloc( (void )ptr, size ); // C realloc
72	else return (T )realloc( (void )ptr, _Alignof(T), size ); // CFA realloc
73	} // realloc
74
75	T * memalign( size_t align ) {
76	return (T *)memalign( align, sizeof(T) ); // C memalign
77	} // memalign
78
79	T * amemalign( size_t align, size_t dim ) {
80	return (T *)amemalign( align, dim, sizeof(T) ); // CFA amemalign
81	} // amemalign
82
83	T * cmemalign( size_t align, size_t dim ) {
84	return (T *)cmemalign( align, dim, sizeof(T) ); // CFA cmemalign
85	} // cmemalign
86
87	T * aligned_alloc( size_t align ) {
88	return (T *)aligned_alloc( align, sizeof(T) ); // C aligned_alloc
89	} // aligned_alloc
90
91	int posix_memalign( T ** ptr, size_t align ) {
92	return posix_memalign( (void **)ptr, align, sizeof(T) ); // C posix_memalign
93	} // posix_memalign
94
95	T * valloc( void ) {
96	return (T *)valloc( sizeof(T) ); // C valloc
97	} // valloc
98
99	T * pvalloc( void ) {
100	return (T *)pvalloc( sizeof(T) ); // C pvalloc
101	} // pvalloc
102	} // distribution
103
104	/*
105	FIX ME : fix alloc interface after Ticker Number 214 is resolved, define and add union to S_fill. Then, modify postfix-fill functions to support T * with nmemb, char, and T object of any size. Finally, change alloc_internal.
106	Or, just follow the instructions below for that.
107
108	1. Replace the current forall-block that contains defintions of S_fill and S_realloc with following:
109	forall( T & \| sized(T) ) {
110	union U_fill { char c; T * a; T t; };
111	struct S_fill { char tag; U_fill(T) fill; };
112	struct S_realloc { inline T *; };
113	}
114
115	2. Replace all current postfix-fill functions with following for updated S_fill:
116	S_fill(T) ?`fill( char a ) { S_fill(T) ret = {'c'}; ret.fill.c = a; return ret; }
117	S_fill(T) ?`fill( T a ) { S_fill(T) ret = {'t'}; memcpy(&ret.fill.t, &a, sizeof(T)); return ret; }
118	S_fill(T) ?`fill( T a[], size_t nmemb ) { S_fill(T) ret = {'a', nmemb}; ret.fill.a = a; return ret; }
119
120	3. Replace the alloc_internal$ function which is outside ttype forall-block with following function:
121	T * alloc_internal$( void * Resize, T * Realloc, size_t Align, size_t Dim, S_fill(T) Fill) {
122	T * ptr = NULL;
123	size_t size = sizeof(T);
124	size_t copy_end = 0;
125
126	if(Resize) {
127	ptr = (T) (void ) resize( (int )Resize, Align, Dim size );
128	} else if (Realloc) {
129	if (Fill.tag != '0') copy_end = min(malloc_size( Realloc ), Dim * size);
130	ptr = (T) (void ) realloc( (int )Realloc, Align, Dim size );
131	} else {
132	ptr = (T) (void ) memalign( Align, Dim * size );
133	}
134
135	if(Fill.tag == 'c') {
136	memset( (char )ptr + copy_end, (int)Fill.fill.c, Dim size - copy_end );
137	} else if(Fill.tag == 't') {
138	for ( int i = copy_end; i <= Dim * size - size ; i += size ) {
139	memcpy( (char *)ptr + i, &Fill.fill.t, size );
140	}
141	} else if(Fill.tag == 'a') {
142	memcpy( (char )ptr + copy_end, Fill.fill.a, min(Dim size - copy_end, size * Fill.nmemb) );
143	}
144
145	return ptr;
146	} // alloc_internal$
147	*/
148
149	typedef struct S_align { inline size_t; } T_align;
150	typedef struct S_resize { inline void *; } T_resize;
151
152	forall( T & ) {
153	struct S_fill { char tag; char c; size_t size; T * at; char t[50]; };
154	struct S_realloc { inline T *; };
155	}
156
157	static inline T_align ?`align ( size_t a ) { return (T_align){a}; }
158	static inline T_resize ?`resize ( void * a ) { return (T_resize){a}; }
159
160	static inline forall( T & \| sized(T) ) {
161	S_fill(T) ?`fill ( T t ) {
162	S_fill(T) ret = { 't' };
163	size_t size = sizeof(T);
164	if ( size > sizeof(ret.t) ) {
165	abort( "ERROR: const object of size greater than 50 bytes given for dynamic memory fill\n" );
166	} // if
167	memcpy( &ret.t, &t, size );
168	return ret;
169	}
170	S_fill(T) ?`fill ( zero_t ) = void; // FIX ME: remove this once ticket 214 is resolved
171	S_fill(T) ?`fill ( T * a ) { return (S_fill(T)){ 'T', '0', 0, a }; } // FIX ME: remove this once ticket 214 is resolved
172	S_fill(T) ?`fill ( char c ) { return (S_fill(T)){ 'c', c }; }
173	S_fill(T) ?`fill ( T a[], size_t nmemb ) { return (S_fill(T)){ 'a', '0', nmemb * sizeof(T), a }; }
174
175	S_realloc(T) ?`realloc ( T * a ) { return (S_realloc(T)){a}; }
176
177	T * alloc_internal$( void * Resize, T * Realloc, size_t Align, size_t Dim, S_fill(T) Fill ) {
178	T * ptr = NULL;
179	size_t size = sizeof(T);
180	size_t copy_end = 0;
181
182	if ( Resize ) {
183	ptr = (T) (void ) resize( (void )Resize, Align, Dim size );
184	} else if ( Realloc ) {
185	if ( Fill.tag != '0' ) copy_end = min(malloc_size( Realloc ), Dim * size );
186	ptr = (T ) (void ) realloc( (void )Realloc, Align, Dim size );
187	} else {
188	ptr = (T ) (void ) memalign( Align, Dim * size );
189	}
190
191	if ( Fill.tag == 'c' ) {
192	memset( (char )ptr + copy_end, (int)Fill.c, Dim size - copy_end );
193	} else if ( Fill.tag == 't' ) {
194	for ( i; copy_end ~ Dim * size ~ size ) {
195	#pragma GCC diagnostic push
196	#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
197	assert( size <= sizeof(Fill.t) );
198	memcpy( (char *)ptr + i, &Fill.t, size );
199	#pragma GCC diagnostic pop
200	}
201	} else if ( Fill.tag == 'a' ) {
202	memcpy( (char )ptr + copy_end, Fill.at, min(Dim size - copy_end, Fill.size) );
203	} else if ( Fill.tag == 'T' ) {
204	memcpy( (char )ptr + copy_end, Fill.at, Dim size );
205	}
206
207	return ptr;
208	} // alloc_internal$
209
210	forall( TT... \| { T * alloc_internal$( void , T , size_t, size_t, S_fill(T), TT ); } ) {
211	T * alloc_internal$( void , T , size_t Align, size_t Dim, S_fill(T) Fill, T_resize Resize, TT rest ) {
212	return alloc_internal$( Resize, (T*)0p, Align, Dim, Fill, rest);
213	}
214
215	T * alloc_internal$( void , T , size_t Align, size_t Dim, S_fill(T) Fill, S_realloc(T) Realloc, TT rest ) {
216	return alloc_internal$( (void*)0p, Realloc, Align, Dim, Fill, rest);
217	}
218
219	T * alloc_internal$( void * Resize, T * Realloc, size_t, size_t Dim, S_fill(T) Fill, T_align Align, TT rest ) {
220	return alloc_internal$( Resize, Realloc, Align, Dim, Fill, rest);
221	}
222
223	T * alloc_internal$( void * Resize, T * Realloc, size_t Align, size_t Dim, S_fill(T), S_fill(T) Fill, TT rest ) {
224	return alloc_internal$( Resize, Realloc, Align, Dim, Fill, rest );
225	}
226
227	T * alloc( TT all ) {
228	return alloc_internal$( (void)0p, (T)0p, (_Alignof(T) > libAlign() ? _Alignof(T) : libAlign()), (size_t)1, (S_fill(T)){'0'}, all );
229	}
230
231	T * alloc( size_t dim, TT all ) {
232	return alloc_internal$( (void)0p, (T)0p, (_Alignof(T) > libAlign() ? _Alignof(T) : libAlign()), dim, (S_fill(T)){'0'}, all );
233	}
234	} // distribution TT
235	} // distribution T
236
237	static inline forall( T & \| sized(T) ) {
238	// CFA safe initialization/copy, i.e., implicit size specification, non-array types
239	T * memset( T * dest, char fill ) {
240	return (T *)memset( dest, fill, sizeof(T) );
241	} // memset
242
243	T * memcpy( T * dest, const T * src ) {
244	return (T *)memcpy( dest, src, sizeof(T) );
245	} // memcpy
246
247	// CFA safe initialization/copy, i.e., implicit size specification, array types
248	T * amemset( T dest[], char fill, size_t dim ) {
249	return (T )(void )memset( dest, fill, dim * sizeof(T) ); // C memset
250	} // amemset
251
252	T * amemcpy( T dest[], const T src[], size_t dim ) {
253	return (T )(void )memcpy( dest, src, dim * sizeof(T) ); // C memcpy
254	} // amemcpy
255	} // distribution
256
257	// CFA deallocation for multiple objects
258	static inline forall( T & ) // FIX ME, problems with 0p in list
259	void free( T * ptr ) {
260	free( (void *)ptr ); // C free
261	} // free
262	static inline forall( T &, TT... \| { void free( TT ); } )
263	void free( T * ptr, TT rest ) {
264	free( ptr );
265	free( rest );
266	} // free
267
268	// CFA allocation/deallocation and constructor/destructor, non-array types
269	static inline forall( T & \| sized(T), TT... \| { void ?{}( T &, TT ); } )
270	T * new( TT p ) {
271	return &((T )malloc()){ p }; // run constructor
272	} // new
273
274	static inline forall( T & \| { void ^?{}( T & ); } )
275	void delete( T * ptr ) {
276	// special case for 0-sized object => always call destructor
277	if ( ptr \|\| sizeof(ptr) == 0 ) { // ignore null but not 0-sized objects
278	^(*ptr){}; // run destructor
279	} // if
280	free( ptr ); // always call free
281	} // delete
282	static inline forall( T &, TT... \| { void ^?{}( T & ); void delete( TT ); } )
283	void delete( T * ptr, TT rest ) {
284	delete( ptr );
285	delete( rest );
286	} // delete
287
288	// CFA allocation/deallocation and constructor/destructor, array types
289	forall( T & \| sized(T), TT... \| { void ?{}( T &, TT ); } ) T * anew( size_t dim, TT p );
290	forall( T & \| sized(T) \| { void ^?{}( T & ); } ) void adelete( T arr[] );
291	forall( T & \| sized(T) \| { void ^?{}( T & ); }, TT... \| { void adelete( TT ); } ) void adelete( T arr[], TT rest );
292
293	//---------------------------------------
294
295	static inline {
296	int strto( const char sptr[], char ** eptr, int base ) { return (int)strtol( sptr, eptr, base ); }
297	unsigned int strto( const char sptr[], char ** eptr, int base ) { return (unsigned int)strtoul( sptr, eptr, base ); }
298	long int strto( const char sptr[], char ** eptr, int base ) { return strtol( sptr, eptr, base ); }
299	unsigned long int strto( const char sptr[], char ** eptr, int base ) { return strtoul( sptr, eptr, base ); }
300	long long int strto( const char sptr[], char ** eptr, int base ) { return strtoll( sptr, eptr, base ); }
301	unsigned long long int strto( const char sptr[], char ** eptr, int base ) { return strtoull( sptr, eptr, base ); }
302
303	float strto( const char sptr[], char ** eptr ) { return strtof( sptr, eptr ); }
304	double strto( const char sptr[], char ** eptr ) { return strtod( sptr, eptr ); }
305	long double strto( const char sptr[], char ** eptr ) { return strtold( sptr, eptr ); }
306	} // distribution
307
308	float _Complex strto( const char sptr[], char ** eptr );
309	double _Complex strto( const char sptr[], char ** eptr );
310	long double _Complex strto( const char sptr[], char ** eptr );
311
312	static inline {
313	int ato( const char sptr[] ) { return (int)strtol( sptr, 0p, 10 ); }
314	unsigned int ato( const char sptr[] ) { return (unsigned int)strtoul( sptr, 0p, 10 ); }
315	long int ato( const char sptr[] ) { return strtol( sptr, 0p, 10 ); }
316	unsigned long int ato( const char sptr[] ) { return strtoul( sptr, 0p, 10 ); }
317	long long int ato( const char sptr[] ) { return strtoll( sptr, 0p, 10 ); }
318	unsigned long long int ato( const char sptr[] ) { return strtoull( sptr, 0p, 10 ); }
319
320	float ato( const char sptr[] ) { return strtof( sptr, 0p ); }
321	double ato( const char sptr[] ) { return strtod( sptr, 0p ); }
322	long double ato( const char sptr[] ) { return strtold( sptr, 0p ); }
323
324	float _Complex ato( const char sptr[] ) { return strto( sptr, 0p ); }
325	double _Complex ato( const char sptr[] ) { return strto( sptr, 0p ); }
326	long double _Complex ato( const char sptr[] ) { return strto( sptr, 0p ); }
327	} // distribution
328
329	//---------------------------------------
330
331	forall( E \| { int ?<?( E, E ); } ) {
332	E * bsearch( E key, const E * vals, size_t dim );
333	size_t bsearch( E key, const E * vals, size_t dim );
334	E * bsearchl( E key, const E * vals, size_t dim );
335	size_t bsearchl( E key, const E * vals, size_t dim );
336	E * bsearchu( E key, const E * vals, size_t dim );
337	size_t bsearchu( E key, const E * vals, size_t dim );
338	} // distribution
339
340	forall( K, E \| { int ?<?( K, K ); K getKey( const E & ); } ) {
341	E * bsearch( K key, const E * vals, size_t dim );
342	size_t bsearch( K key, const E * vals, size_t dim );
343	E * bsearchl( K key, const E * vals, size_t dim );
344	size_t bsearchl( K key, const E * vals, size_t dim );
345	E * bsearchu( K key, const E * vals, size_t dim );
346	size_t bsearchu( K key, const E * vals, size_t dim );
347	} // distribution
348
349	forall( E \| { int ?<?( E, E ); } ) {
350	void qsort( E * vals, size_t dim );
351	} // distribution
352
353	//---------------------------------------
354
355	extern "C" { // override C version
356	void srandom( unsigned int seed );
357	long int random( void ); // GENERATES POSITIVE AND NEGATIVE VALUES
358	// For positive values, use unsigned int, e.g., unsigned int r = random() % 100U;
359	} // extern "C"
360
361	static inline {
362	long int random( long int l, long int u ) { if ( u < l ) [u, l] = [l, u]; return lrand48() % (u - l + 1) + l; } // [l,u]
363	long int random( long int u ) { return random( 0, u - 1 ); } // [0,u)
364	unsigned long int random( void ) { return lrand48(); }
365	unsigned long int random( unsigned long int u ) { return lrand48() % u; } // [0,u)
366	unsigned long int random( unsigned long int l, unsigned long int u ) { if ( u < l ) [u, l] = [l, u]; return lrand48() % (u - l + 1) + l; } // [l,u]
367
368	char random( void ) { return (unsigned long int)random(); }
369	char random( char u ) { return (unsigned long int)random( (unsigned long int)u ); } // [0,u)
370	char random( char l, char u ) { return random( (unsigned long int)l, (unsigned long int)u ); } // [l,u)
371	int random( void ) { return (long int)random(); }
372	int random( int u ) { return (long int)random( (long int)u ); } // [0,u]
373	int random( int l, int u ) { return random( (long int)l, (long int)u ); } // [l,u)
374	unsigned int random( void ) { return (unsigned long int)random(); }
375	unsigned int random( unsigned int u ) { return (unsigned long int)random( (unsigned long int)u ); } // [0,u]
376	unsigned int random( unsigned int l, unsigned int u ) { return random( (unsigned long int)l, (unsigned long int)u ); } // [l,u)
377	} // distribution
378
379	float random( void ); // [0.0, 1.0)
380	double random( void ); // [0.0, 1.0)
381	float _Complex random( void ); // [0.0, 1.0)+[0.0, 1.0)i
382	double _Complex random( void ); // [0.0, 1.0)+[0.0, 1.0)i
383	long double _Complex random( void ); // [0.0, 1.0)+[0.0, 1.0)i
384
385	//---------------------------------------
386
387	// Sequential Pseudo Random-Number Generator : generate repeatable sequence of values that appear random.
388	//
389	// Declaration :
390	// PRNG sprng = { 1009 } - set starting seed versus random seed
391	//
392	// Interface :
393	// set_seed( sprng, 1009 ) - set starting seed for ALL kernel threads versus random seed
394	// get_seed( sprng ) - read seed
395	// prng( sprng ) - generate random value in range [0,UINT_MAX]
396	// prng( sprng, u ) - generate random value in range [0,u)
397	// prng( sprng, l, u ) - generate random value in range [l,u]
398	// calls( sprng ) - number of generated random value so far
399	//
400	// Examples : generate random number between 5-21
401	// prng( sprng ) % 17 + 5; values 0-16 + 5 = 5-21
402	// prng( sprng, 16 + 1 ) + 5;
403	// prng( sprng, 5, 21 );
404	// calls( sprng );
405
406	forall( PRNG &, R )
407	trait basic_prng {
408	void set_seed( PRNG & prng, R seed ); // set seed
409	R get_seed( PRNG & prng ); // get seed
410	R prng( PRNG & prng );
411	void ?{}( PRNG & prng ); // random seed
412	void ?{}( PRNG & prng, R seed ); // fixed seed
413	}; // basic_prng
414
415	static inline forall( PRNG &, R \| basic_prng( PRNG, R ) \| { R ?%?( R, R ); } ) {
416	R prng( PRNG & prng, R u ) { return prng( prng ) % u; } // [0,u)
417	}
418	static inline forall( PRNG &, R \| basic_prng( PRNG, R ) \| { R ?+?( R, R ); R ?-?( R, R ); R ?%?( R, R ); void ?{}( R &, one_t ); } ) {
419	R prng( PRNG & prng, R l, R u ) { return prng( prng, u - l + (R){1} ) + l; } // [l,u]
420	}
421
422	struct PRNG32 {
423	uint32_t callcnt; // call count
424	uint32_t seed; // current seed
425	PRNG_STATE_32_T state; // random state
426	}; // PRNG
427
428	static inline {
429	void set_seed( PRNG32 & prng, uint32_t seed_ ) with( prng ) { seed = seed_; PRNG_SET_SEED_32( state, seed ); }
430	uint32_t get_seed( PRNG32 & prng ) __attribute__(( warn_unused_result )) with( prng ) { return seed; }
431	uint32_t prng( PRNG32 & prng ) __attribute__(( warn_unused_result )) with( prng ) { callcnt += 1; return PRNG_NAME_32( state ); } // [0,UINT_MAX]
432	uint32_t prng( PRNG32 & prng, uint32_t u ) __attribute__(( warn_unused_result )) { return prng( prng ) % u; } // [0,u)
433	uint32_t prng( PRNG32 & prng, uint32_t l, uint32_t u ) __attribute__(( warn_unused_result )) { return prng( prng, u - l + 1 ) + l; } // [l,u]
434	uint32_t calls( PRNG32 & prng ) __attribute__(( warn_unused_result )) with( prng ) { return callcnt; }
435	void ?{}( PRNG32 & prng ) with( prng ) { callcnt = 0; set_seed( prng, rdtscl() ); } // random seed
436	void ?{}( PRNG32 & prng, uint32_t seed ) with( prng ) { callcnt = 0; set_seed( prng, seed ); } // fixed seed
437	} // distribution
438
439	struct PRNG64 {
440	uint64_t callcnt; // call count
441	uint64_t seed; // current seed
442	PRNG_STATE_64_T state; // random state
443	}; // PRNG
444
445	static inline {
446	void set_seed( PRNG64 & prng, uint64_t seed_ ) with( prng ) { seed = seed_; PRNG_SET_SEED_64( state, seed ); }
447	uint64_t get_seed( PRNG64 & prng ) __attribute__(( warn_unused_result )) with( prng ) { return seed; }
448	uint64_t prng( PRNG64 & prng ) __attribute__(( warn_unused_result )) with( prng ) { callcnt += 1; return PRNG_NAME_64( state ); } // [0,UINT_MAX]
449	uint64_t prng( PRNG64 & prng, uint64_t u ) __attribute__(( warn_unused_result )) { return prng( prng ) % u; } // [0,u)
450	uint64_t prng( PRNG64 & prng, uint64_t l, uint64_t u ) __attribute__(( warn_unused_result )) { return prng( prng, u - l + 1 ) + l; } // [l,u]
451	uint64_t calls( PRNG64 & prng ) __attribute__(( warn_unused_result )) with( prng ) { return callcnt; }
452	void ?{}( PRNG64 & prng ) with( prng ) { callcnt = 0; set_seed( prng, rdtscl() ); } // random seed
453	void ?{}( PRNG64 & prng, uint64_t seed ) with( prng ) { callcnt = 0; set_seed( prng, seed ); } // fixed seed
454	} // distribution
455
456	// Concurrent Pseudo Random-Number Generator : generate repeatable sequence of values that appear random.
457	//
458	// Interface :
459	// set_seed( 1009 ) - fixed seed for all kernel threads versus random seed
460	// get_seed() - read seed
461	// prng() - generate random value in range [0,UINT_MAX]
462	// prng( u ) - generate random value in range [0,u)
463	// prng( l, u ) - generate random value in range [l,u]
464	//
465	// Examples : generate random number between 5-21
466	// prng() % 17 + 5; values 0-16 + 5 = 5-21
467	// prng( 16 + 1 ) + 5;
468	// prng( 5, 21 );
469
470	// Harmonize with concurrency/thread.hfa.
471	void set_seed( size_t seed_ ) OPTIONAL_THREAD; // set global seed
472	size_t get_seed() __attribute__(( warn_unused_result )); // get global seed
473	size_t prng( void ) __attribute__(( warn_unused_result )) OPTIONAL_THREAD; // [0,UINT_MAX]
474	static inline {
475	size_t prng( size_t u ) __attribute__(( warn_unused_result )) { return prng() % u; } // [0,u)
476	size_t prng( size_t l, size_t u ) __attribute__(( warn_unused_result )) { return prng( u - l + 1 ) + l; } // [l,u]
477	} // distribution
478
479	//---------------------------------------
480
481	extern bool threading_enabled( void ) OPTIONAL_THREAD;
482
483	// Local Variables: //
484	// mode: c //
485	// tab-width: 4 //
486	// End: //

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