100-C++

向线程传参数

#include <iostream>#include <cstdlib>#include <pthread.h> using namespace std; #define NUM_THREADS     5 struct thread_data{   int  thread_id;   char *message;}; void *PrintHello(void *threadarg){   struct thread_data *my_data;    my_data = (struct thread_data *) threadarg;    cout << "Thread ID : " << my_data->thread_id ;   cout << " Message : " << my_data->message << endl;    pthread_exit(NULL);} int main (){   pthread_t threads[NUM_THREADS];   struct thread_data td[NUM_THREADS];   int rc;   int i;    for( i=0; i < NUM_THREADS; i++ ){      cout <<"main() : creating thread, " << i << endl;      td[i].thread_id = i;      td[i].message = "This is message";      rc = pthread_create(&threads[i], NULL,                          PrintHello, (void *)&td[i]);      if (rc){         cout << "Error:unable to create thread," << rc << endl;         exit(-1);      }   }   pthread_exit(NULL);}