source: tests/exceptions/hotpotato.cfa@ c041d29

Last change on this file since c041d29 was f0c9c9b, checked in by Peter A. Buhr <pabuhr@…>, 21 months ago

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1#include <fstream.hfa> // sin/sout
2#include <stdlib.hfa> // convert
3#include <string.h>
4#include <coroutine.hfa>
5
6struct Potato {
7 PRNG & prng;
8 unsigned int deadline; // when timer goes off
9 unsigned int timer; // up counter to deadline
10}; // Potato
11
12void reset( Potato & potato, unsigned int maxTicks = 10 );
13void ?{}( Potato & potato, PRNG & prng, unsigned int maxTicks = 10 );
14
15void ?{}( Potato & potato, PRNG & prng, unsigned int maxTicks ) with(potato) {
16 &potato.prng = &prng;
17 reset( potato, maxTicks );
18 } // Potato
19
20coroutine Player {
21 PRNG & prng;
22 int id; // player identity
23 Potato & potato; // potato being tossed
24 Player * partner[2]; // left and right player
25}; // Player
26
27void ?{}( Player & player, PRNG & prng, unsigned int id, Potato & potato ) {
28 &player.prng = &prng;
29 player.id = id;
30 &player.potato = &potato;
31 } // Player
32
33Player & umpire;
34
35ExceptionDecl( Explode );
36ExceptionDecl( Terminate, Player * victim; );
37ExceptionDecl( Election );
38ExceptionDecl( cmd_error ); // convert(...) throws out_of_range or invalid_argument
39
40void reset( Potato & potato, unsigned int maxTicks ) with(potato) {
41 if ( maxTicks < 2 ) abort( "Hot Potato initialized with less than 2 ticks" ); // optional
42 deadline = prng( prng, 1, maxTicks );
43 timer = 0;
44 sout | " POTATO goes off after " | deadline | " tick" | nosep | (deadline > 1 ? "s" : "");
45} // reset
46
47void countdown( Potato & potato ) with(potato) {
48 timer += 1;
49 if ( timer == deadline ) throwResume ExceptionInst( Explode );
50} // countdown
51
52static unsigned int rightOf( unsigned int me, unsigned int total ) {
53 return ( me + 1 ) % total;
54} // rightOf
55
56static unsigned int leftOf( unsigned int me, unsigned int total ) {
57 return ( me + total - 1) % total;
58} // leftOf
59
60enum { LEFT = 0, RIGHT = 1 };
61
62static void vote( Player & player, Election & election ) { // cause partner to vote
63 resumeAt( player, election );
64 resume( player );
65} // vote
66
67void init( Player & player, Player & lp, Player & rp ) with(player) { // supply partners
68 partner[LEFT] = &lp;
69 partner[RIGHT] = &rp;
70 resume( player ); // establish main as starter for termination
71} // init
72
73int getId( Player & player ) { // player id
74 return player.id;
75} // getId
76
77void main( Player & player ) with(player) {
78 suspend; // return immediately after establishing starter
79 try {
80 for ( ;; ) {
81 poll(); // check for non-local exceptions before proceeding
82
83 if ( partner[LEFT] == &player ) { // stop when only one player
84 sout | id | " wins the Match!";
85 return;
86 } // exit
87
88 countdown( potato ); // player is eliminated if countdown() returned true
89
90 size_t side = prng( prng, 2 );
91 sout | id | " -> " | nonl;
92 resume( *partner[ side ] ); // random toss left/right
93 } // for
94 } catchResume( Terminate * v ) {
95 v->victim->partner[LEFT]->partner[RIGHT] = v->victim->partner[RIGHT]; // unlink node
96 v->victim->partner[RIGHT]->partner[LEFT] = v->victim->partner[LEFT];
97 delete( v->victim );
98 reset( potato );
99 sout | "U " | nonl; // start new game
100 flush( sout );
101 } catchResume( Election * election ) {
102 sout | "election";
103 sout | " -> " | id | nonl;
104 if ( id > getId( umpire ) ) &umpire = &player; // set umpire to highest id so far
105 vote( *partner[RIGHT], *election );
106 } catchResume ( Explode * ) {
107 sout | id | " is eliminated";
108 if ( &player == &umpire ) {
109 id = -1; // remove from election
110 vote( *partner[RIGHT], ExceptionInst( Election ) ); // start election
111 try { poll(); } catchResume( Election * election ) {} // handle end of election
112 sout | " : umpire " | getId( umpire );
113 } // if
114 resumeAt( umpire, ExceptionInst( Terminate, &player ) );
115 resume( umpire ); // resume umpire to terminate this player
116 assert( false ); // no return
117 } // try
118} // main
119
120
121int main( int argc, char * argv[] ) {
122 enum {
123 MinNoPlayers = 2, // minimum players in the game
124 MaxNoPlayers = 10, // maximum players in the game
125 DefaultGames = 5, // default games to play
126 };
127 intmax_t numGames = DefaultGames; // games to play
128 intmax_t numPlayers = 0; // players for a particular game
129 intmax_t seed = 42; // random-number seed
130 bool playersSet = false;
131 char * nosummary = getenv( "NOSUMMARY" ); // print extra output
132
133 try {
134 choose ( argc ) {
135 case 4:
136 if ( strcmp( argv[3], "d" ) != 0 ) { // default ?
137 seed = convert( argv[3] ); if ( seed < 1 ) throw ExceptionInst( cmd_error ); // invalid ?
138 } // if
139 fallthrough;
140 case 3:
141 if ( strcmp( argv[2], "d" ) != 0 ) { // default ?
142 numPlayers = convert( argv[2] ); if ( numPlayers < 2 ) throw ExceptionInst( cmd_error ); // invalid ?
143 playersSet = true;
144 } // if
145 fallthrough;
146 case 2:
147 if ( strcmp( argv[1], "d" ) != 0 ) { // default ?
148 numGames = convert( argv[1] ); if ( numGames < 0 ) throw ExceptionInst( cmd_error ); // invalid ?
149 } // if
150 fallthrough;
151 case 1: ; // defaults
152 default: // too many arguments
153 throw ExceptionInst( cmd_error );
154 } // choose
155 } catch( exception_t * ) { // catch any
156 exit | "Usage: " | argv[0]
157 | " [ games (>=0) | 'd' (default " | DefaultGames
158 | ") [ players (>=2) | 'd' (random " | MinNoPlayers | "-" | MaxNoPlayers
159 | ") [ seed (>0) | 'd' (random) ] ] ]";
160 } // try
161 sout | numGames | numPlayers | seed;
162
163 PRNG mprng, hprng, pprng;
164 if ( seed != 0 ) { // specified on command line ?
165 set_seed( mprng, seed ); set_seed( hprng, seed ); set_seed( pprng, seed );
166 } // if
167
168 for ( game; 1 ~= numGames ) {
169 if ( ! playersSet ) numPlayers = prng( mprng, MinNoPlayers, MaxNoPlayers );
170 sout | numPlayers | " players in the game";
171 {
172 Potato potato{ hprng }; // hot potato to be tossed
173 Player * players[numPlayers];
174
175 for ( unsigned int i = 0; i < (unsigned int)numPlayers; i += 1 ) { // start the players
176 players[i] = malloc();
177 ?{}( *players[i], pprng, i, potato );
178 } // for
179
180 // Do not swap player[0] with itself.
181 unsigned int rposn = prng( mprng, 1, numPlayers - 1 ); // swap random position with 0
182 swap( players[0], players[rposn] );
183
184 // Tell each player its partner.
185 for ( unsigned int i = 0; i < (unsigned int)numPlayers; i += 1 ) {
186 init( *players[i], *players[leftOf(i, numPlayers)], *players[rightOf(i, numPlayers)] );
187 } // for
188
189 &umpire = players[rposn]; // designate umpire and start game
190 sout | "U " | nonl;
191 resume( *players[rposn] );
192 delete( &umpire );
193 }
194 if ( game < (unsigned int)numGames ) sout | nl | nl; // whitespace between games
195 } // for
196} // main
197
198// Local Variables: //
199// compile-command: "make hotpotato" //
200// End: //
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