Try pthreads.cpp. Modify it so that they run 3 threads (instead of two) and each thread runs a different function, displaying a different message. Copy-and-paste the source code and the outputs in your report. /*   pthreads_demo.cpp   A very simple example demonstrating the usage of pthreads.   Compile: g++ -o pthreads_demo pthreads_demo.cpp -lpthread   Execute: ./pthreads_demo */   #include #include   using namespace std;   //The thread void * thread_func (void *data) {   char *tname = (char *) data;     printf("My thread identifier is %s\n", tname);     pthread_exit (0); }   int main () {   pthread_t id1, id2;           //thread identifiers   pthread_attr_t attr1, attr2;  //set of thread attributes   char *tnames[2] = { "Thread 1", "Thread 2" }; //names of threads   //get the default attributes   pthread_attr_init (&attr1);   pthread_attr_init (&attr2);     //create the threads   pthread_create (&id1, &attr1, thread_func, tnames[0]);   pthread_create (&id2, &attr2, thread_func, tnames[1]);     //wait for the threads to exit   pthread_join (id1, NULL);   pthread_join (id2, NULL);     return 0; }

Try pthreads.cpp. Modify it so that they run 3 threads (instead of two) and each thread runs a different function, displaying a different message. Copy-and-paste the source code and the outputs in your report.

/*

  pthreads_demo.cpp

  A very simple example demonstrating the usage of pthreads.

  Compile: g++ -o pthreads_demo pthreads_demo.cpp -lpthread

  Execute: ./pthreads_demo

*/

#include <pthread.h>

#include <stdio.h>

using namespace std;

//The thread

void * thread_func (void *data)

{

  char *tname = (char *) data;

  printf("My thread identifier is %s\n", tname);

  pthread_exit (0);

}

int main ()

{

  pthread_t id1, id2;           //thread identifiers

  pthread_attr_t attr1, attr2;  //set of thread attributes

  char *tnames[2] = { "Thread 1", "Thread 2" }; //names of threads

  //get the default attributes

  pthread_attr_init (&attr1);

  pthread_attr_init (&attr2);

  //create the threads

  pthread_create (&id1, &attr1, thread_func, tnames[0]);

  pthread_create (&id2, &attr2, thread_func, tnames[1]);

  //wait for the threads to exit

  pthread_join (id1, NULL);

  pthread_join (id2, NULL);

  return 0;

}