问使用线程递增全局变量

EN

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

int globalVariable = 1;
void *myfunc (void *myvar);

int main (void) {

    pthread_t thread1;
    int waitms;

    while(globalVariable <= 50){
        printf("Main function: %d \n", globalVariable);

        if (globalVariable==9) {
            pthread_create(&thread1, NULL, myfunc, NULL);
            pthread_join(thread1, NULL);
        }
        usleep(300000);

    globalVariable++;
    }
    return 0;
}

void *myfunc (void *myvar){

    int waitms;

    while(globalVariable<=50) {

        printf("Thread1: %d \n", globalVariable);

        usleep(300000);

        globalVariable++;
    }
    return 0;

}