Solaris

#include <stdlib.h>
#include <pthread.h>
#define MEMSIZE ( 1024UL * 1024UL )
#define NUMTHR 16
void *worker( void * arg )
{
    char *ptr;
    do
    {
          ptr = ( char * ) calloc( 1, MEMSIZE );
    }
    while ( NULL != ptr );
    return( NULL );
}
int main( int argc, char **argv )
{
    int ii;
    void *status;
    pthread_t tids[ NUMTHR ];
    for ( ii = 0; ii < NUMTHR; ii++ )
    {
        pthread_create( &( tids[ ii ] ), NULL, worker, NULL );
    }
    for ( ii = 0; ii < NUMTHR; ii++ )
    {
        pthread_join( tids[ ii ], &status );
    }
    return( 0 );
}

cc -g -m64 ...