// Ovidiu Gheorghioiu <ovy@alum.mit.edu>, (C) 2006// License: GNU General Public License V2//// Stress-test the AtomicString class for thread safety. Run on SMP for maximum exposure.#include <stdio.h>#include <pthread.h>#include <stdlib.h>#include "atomicstring.h"void *Worker(void *num) {    srand( reinterpret_cast<int>( num ) );    QString base = "str";    // create 5 strings, destroy them, copy them around    const int kNumStrings = 5;    AtomicString *atStrings[kNumStrings * 2];    for( int i = 0; i < kNumStrings * 2; i++ ) atStrings[i] = NULL;    const int kIterations = 100000;    for( int i = 0; i < kIterations; i++ ) {	int k = rand() % (kNumStrings * 2);	if( atStrings[k] == NULL ) {	    // the upper half are sometimes copies of the corresponding	    // lower half strings	    if( k >= kNumStrings && atStrings[k % kNumStrings] != NULL ) {		atStrings[k] = new AtomicString( *atStrings[k % kNumStrings] );	    } else {		atStrings[k] = new AtomicString( base + QString::number( k ) );	    }	} else {	    // check the string; could be either upper or lower	    QString str = atStrings[k]->string();	    if( str != base + QString::number( k )		&& str != base + QString::number( k % kNumStrings ) ) {		qFatal( "unexpected atStrings[%d]: %s", k, str.ascii() );	    }	    delete atStrings[k];	    atStrings[k] = NULL;	}    }    return NULL;}int main() {    const int kWorkers = 2;    pthread_t workers[kWorkers];    for( int i = 0; i < kWorkers; i++ ) {	if( pthread_create(& workers[i], NULL,			   & Worker,			   reinterpret_cast<void *>(i))	    != 0)	    qFatal( "Could not create thread %d", i );    }    for( int i = 0; i < kWorkers; i++ ) {	void *thread_return;	pthread_join( workers[i], &thread_return );    }}