mirror of
https://github.com/golang/go
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331 lines
7.4 KiB
C
331 lines
7.4 KiB
C
/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of "The Computer Language Benchmarks Game" nor the
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name of "The Computer Language Shootout Benchmarks" nor the names of
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its contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/* The Computer Language Benchmarks Game
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http://shootout.alioth.debian.org/
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contributed by Michael Barker
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based on a Java contribution by Luzius Meisser
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convert to C by dualamd
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <pthread.h>
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enum Colour
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{
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blue = 0,
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red = 1,
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yellow = 2,
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Invalid = 3
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};
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const char* ColourName[] = {"blue", "red", "yellow"};
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const int STACK_SIZE = 32*1024;
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typedef unsigned int BOOL;
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const BOOL TRUE = 1;
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const BOOL FALSE = 0;
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int CreatureID = 0;
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enum Colour doCompliment(enum Colour c1, enum Colour c2)
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{
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switch (c1)
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{
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case blue:
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switch (c2)
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{
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case blue:
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return blue;
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case red:
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return yellow;
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case yellow:
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return red;
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default:
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goto errlb;
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}
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case red:
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switch (c2)
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{
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case blue:
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return yellow;
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case red:
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return red;
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case yellow:
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return blue;
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default:
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goto errlb;
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}
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case yellow:
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switch (c2)
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{
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case blue:
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return red;
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case red:
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return blue;
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case yellow:
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return yellow;
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default:
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goto errlb;
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}
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default:
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break;
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}
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errlb:
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printf("Invalid colour\n");
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exit( 1 );
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}
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/* convert integer to number string: 1234 -> "one two three four" */
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char* formatNumber(int n, char* outbuf)
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{
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int ochar = 0, ichar = 0;
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int i;
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char tmp[64];
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const char* NUMBERS[] =
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{
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"zero", "one", "two", "three", "four", "five",
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"six", "seven", "eight", "nine"
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};
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ichar = sprintf(tmp, "%d", n);
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for (i = 0; i < ichar; i++)
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ochar += sprintf( outbuf + ochar, " %s", NUMBERS[ tmp[i] - '0' ] );
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return outbuf;
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}
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struct MeetingPlace
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{
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pthread_mutex_t mutex;
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int meetingsLeft;
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struct Creature* firstCreature;
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};
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struct Creature
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{
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pthread_t ht;
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pthread_attr_t stack_att;
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struct MeetingPlace* place;
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int count;
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int sameCount;
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enum Colour colour;
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int id;
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BOOL two_met;
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BOOL sameid;
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};
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void MeetingPlace_Init(struct MeetingPlace* m, int meetings )
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{
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pthread_mutex_init( &m->mutex, 0 );
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m->meetingsLeft = meetings;
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m->firstCreature = 0;
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}
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BOOL Meet( struct Creature* cr)
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{
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BOOL retval = TRUE;
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struct MeetingPlace* mp = cr->place;
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pthread_mutex_lock( &(mp->mutex) );
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if ( mp->meetingsLeft > 0 )
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{
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if ( mp->firstCreature == 0 )
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{
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cr->two_met = FALSE;
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mp->firstCreature = cr;
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}
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else
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{
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struct Creature* first;
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enum Colour newColour;
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first = mp->firstCreature;
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newColour = doCompliment( cr->colour, first->colour );
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cr->sameid = cr->id == first->id;
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cr->colour = newColour;
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cr->two_met = TRUE;
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first->sameid = cr->sameid;
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first->colour = newColour;
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first->two_met = TRUE;
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mp->firstCreature = 0;
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mp->meetingsLeft--;
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}
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}
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else
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retval = FALSE;
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pthread_mutex_unlock( &(mp->mutex) );
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return retval;
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}
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void* CreatureThreadRun(void* param)
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{
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struct Creature* cr = (struct Creature*)param;
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while (TRUE)
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{
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if ( Meet(cr) )
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{
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while (cr->two_met == FALSE)
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sched_yield();
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if (cr->sameid)
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cr->sameCount++;
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cr->count++;
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}
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else
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break;
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}
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return 0;
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}
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void Creature_Init( struct Creature *cr, struct MeetingPlace* place, enum Colour colour )
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{
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cr->place = place;
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cr->count = cr->sameCount = 0;
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cr->id = ++CreatureID;
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cr->colour = colour;
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cr->two_met = FALSE;
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pthread_attr_init( &cr->stack_att );
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pthread_attr_setstacksize( &cr->stack_att, STACK_SIZE );
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pthread_create( &cr->ht, &cr->stack_att, &CreatureThreadRun, (void*)(cr) );
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}
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/* format meeting times of each creature to string */
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char* Creature_getResult(struct Creature* cr, char* str)
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{
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char numstr[256];
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formatNumber(cr->sameCount, numstr);
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sprintf( str, "%u%s", cr->count, numstr );
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return str;
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}
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void runGame( int n_meeting, int ncolor, const enum Colour* colours )
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{
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int i;
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int total = 0;
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char str[256];
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struct MeetingPlace place;
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struct Creature *creatures = (struct Creature*) calloc( ncolor, sizeof(struct Creature) );
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MeetingPlace_Init( &place, n_meeting );
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/* print initial color of each creature */
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for (i = 0; i < ncolor; i++)
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{
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printf( "%s ", ColourName[ colours[i] ] );
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Creature_Init( &(creatures[i]), &place, colours[i] );
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}
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printf("\n");
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/* wait for them to meet */
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for (i = 0; i < ncolor; i++)
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pthread_join( creatures[i].ht, 0 );
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/* print meeting times of each creature */
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for (i = 0; i < ncolor; i++)
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{
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printf( "%s\n", Creature_getResult(&(creatures[i]), str) );
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total += creatures[i].count;
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}
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/* print total meeting times, should equal n_meeting */
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printf( "%s\n\n", formatNumber(total, str) );
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/* cleaup & quit */
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pthread_mutex_destroy( &place.mutex );
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free( creatures );
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}
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void printColours( enum Colour c1, enum Colour c2 )
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{
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printf( "%s + %s -> %s\n",
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ColourName[c1],
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ColourName[c2],
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ColourName[doCompliment(c1, c2)] );
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}
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void printColoursTable(void)
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{
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printColours(blue, blue);
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printColours(blue, red);
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printColours(blue, yellow);
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printColours(red, blue);
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printColours(red, red);
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printColours(red, yellow);
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printColours(yellow, blue);
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printColours(yellow, red);
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printColours(yellow, yellow);
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}
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int main(int argc, char** argv)
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{
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int n = (argc == 2) ? atoi(argv[1]) : 600;
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printColoursTable();
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printf("\n");
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const enum Colour r1[] = { blue, red, yellow };
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const enum Colour r2[] = { blue, red, yellow,
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red, yellow, blue,
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red, yellow, red, blue };
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runGame( n, sizeof(r1) / sizeof(r1[0]), r1 );
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runGame( n, sizeof(r2) / sizeof(r2[0]), r2 );
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return 0;
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}
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