#include <cstdlib>

#include <pthread.h>

#include <stdio.h>

#ifdef EMSCRIPTEN

#include <emscripten.h>

#endif // EMSCRIPTEN

pthread_mutex_t lock;

void* crack( void* arg ) {

unsigned int id = *( static_cast<unsigned int*>( arg ) );

srand( id );

unsigned int key = -1;

while( true ) {

unsigned int v = rand();

if( v == ( v & key ) ) {

if( pthread_mutex_lock( &lock ) ) {

printf( "mutex lock failed\n" );

return nullptr;

}

printf( "thread=%u key=%x value=%x\n", id, key, v );

if( pthread_mutex_unlock( &lock ) ) {

printf( "mutex unlock failed\n" );

return nullptr;

}

key = key << 1;

}

}

}

int main() {

if( pthread_mutex_init( &lock, NULL ) != 0 ) {

printf( "mutex init failed\n" );

return -1;

}

pthread_t thread[2];

for( unsigned int i = 0; i < 2; ++i ) {

if( pthread_create( thread + i, nullptr, crack, static_cast<void*>( new unsigned int( i ) ) ) ) {

fprintf( stderr, "Failed to start thread.\n" );

}

}

// Emscripten needs to fall through and exit main.

#ifndef EMSCRIPTEN

// Wait for thread that will never exit.

for( unsigned int i = 0; i < 2; ++i ) {

if( pthread_join( thread[i], nullptr ) ) {

fprintf( stderr, "Failed to join thread.\n" );

}

}

#endif // EMSCRIPTEN

return 0;

}