Execution threads

7

Parallel execution

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#define NLOOPS 1000
void *fping( void *np ) {
int i, j;
for ( i = 0; i < NLOOPS; i++ ) {
printf( "ping." );
for ( j = 0; j < 1000; j++ )
(void) rand();
}
pthread_exit( 0 );
}
void *fpong( void *np ) {
int i, j;
for ( i = 0; i < NLOOPS; i++ ) {
printf( "pong." );
for ( j = 0; j < 1000; j++ )
(void) rand();
}
pthread_exit( 0 );
}
int main( int argc, char *argv[] ) {
pthread_t ping, pong;
pthread_create( &ping, 0, fping, 0 );
pthread_create( &pong, 0, fpong, 0 );
pthread_exit( 0 );
}

$ gcc -Wall -lpthread pingpong.c -o pingpong
$ ./pingpong
ping.ping.pong.ping.pong.ping.pong.ping.ping.pong.ping.pong.pong...

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