I believe the answer is A.
Hope this helps!
To change the name of a field
<span>right click the column heading for the field, click rename column on the shorcut menu, and then type the desired field name</span>
Answer:
The only way ik you can do that is to sign out hope i helped
Explanation:
Answer:
Backup copy
Explanation:
system restore point is called a backup or backup copy of the system, this point keeps the inicial setting or configuration on the software, we usually use this tool when we're having some issues with the software, usually during the installation process of a new software, letting us to save the data and off course with this point created the user could revert the issues or fix the problems occuring in the configuration.
Answer:
A mutex is used here.
A mutex is a locking mechanism set before using a shared resource and is released after using the shared resource. When the lock is set, only one task accesses the mutex.
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<pthread.h>
#include<unistd.h>
pthread_t tid[2];
int flag=0;
int a = 0;
pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
void *thread_a(void *arg)
{
pthread_mutex_lock(&lock);
a += 2;
pthread_mutex_unlock(&lock);
flag = 1;
return NULL;
}
void *thread_b(void *arg)
{
int b = 0;
if(flag){
b++;
}
b += 3;
pthread_mutex_lock(&lock);
a -= b;
pthread_mutex_unlock(&lock);
return NULL;
}
int main()
{
while(1) {
pthread_create(&tid[0],NULL,thread_a,NULL);
pthread_create(&tid[1],NULL,thread_b,NULL);
sleep(1);
}
pthread_exit(NULL);
return 0;
}