我想爲arg_struct動態分配內存。如果我只是在堆棧上分配它,它會正常工作,但不是動態的。動態地,它在主函數中打印字符串,但是當它傳遞給線程函數時,它不起作用。任何想法爲什麼它不起作用?分配struct堆棧:Pthread_create
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
struct arg_struct {
int *arg1;
char *str;
};
void *print_the_arguments(void *arguments)
{
struct arg_struct *args = (struct arg_struct *)arguments;
printf("The result is : %s\n",args->str);
pthread_exit(NULL);
return NULL;
}
int main()
{
pthread_t some_thread;
struct arg_struct *args = malloc(sizeof(struct arg_struct));
//struct arg_struct args; // uncommenting this and args.str WORKS (prints to thread function)
args->str = malloc(sizeof(char)*6);
args->str = "hello";
//args.str = "hello";
printf("printing from main: %s\n", args->str); // Prints here but not in other function
if (pthread_create(&some_thread, NULL, &print_the_arguments, (void *)&args) != 0) {
printf("Uh-oh!\n");
return -1;
}
return pthread_join(some_thread, NULL); /* Wait until thread is finished */
}
這個:'args-> str = malloc(sizeof(char)* 5); args-> str =「hello」;'分配五個字節(當你想要6個時),然後當你爲'args-> str'分配別的東西時,立即丟失那個內存。 –
將來,請在發佈前刪除這些行號。 – hauzer