[FUGSPBR] Fw: GCC + thread

[Fernando]

bom Dia ...

 Instalei o FreeBSD 4.7 standart e estou tentando compilar em C um exemplo
de
 Thread.
 Mas ocorre o seguinte erro ..

 1. tentativa
 turbo# gcc -o arq -lpthread pri.c
 /usr/libexec/elf/ld: cannot find -lpthread

 2. tentativa
 turbo# gcc -o arq -pthread pri.c
 /tmp/ccCLXG8d.o: In function `thread_function':
 /tmp/ccCLXG8d.o(.text+0x45): undefined reference to `a_thread_exit'

 O que esta errado ... tenho que instalar mais alguma coisa ???
 Estou trabalhando com socket e tudo ok ... o problema eh quando tento
 compilar alguma coisa com Thread.

 Obrigado
 Fernando


 <pri.c>
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <pthread.h>

 char message[] = "Hello World";

 void *thread_function(void *arg) {
   printf("thread_function is running. Argument was %s\n", (char *)arg);
   sleep(3);
   strcpy(message, "Bye!");
   a_thread_exit("Thank you for the CPU time");
 }


 int main() {
   int res;
   pthread_t a_thread;
   void *thread_result;
   res = pthread_create(&a_thread, NULL,
   thread_function, (void *)message);
   if (res != 0) {
     perror("Thread creation failed");
     exit(EXIT_FAILURE);
   }
   printf("Waiting for thread to finish...\n");
   res = pthread_join(a_thread,&thread_result);
   if (res != 0) {
     perror("Thread join failed");
     exit(EXIT_FAILURE);
   }
   printf("Thread joined, it returned %s\n", (char *)thread_result);
   printf("Message is now %s\n", message);
   exit(EXIT_SUCCESS);
 }





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