4. Program Design (10) There is a plate on the table. You can only put one apple or one banana on the plate. If the father puts an apple on the plate, the son picks it up and eats it. If the father puts a banana on the plate, the daughter picks it up and eats it. Define the semaphore and write the PV (or wait/signal) semaphore operations to solve this problem. 5. Short-answer Questions (25) 1. (6) What is deadlock? (2) List four ways to prevent the deadlock. (4) 2. (6) Detail the benefit of multi-threaded programming (list at least 4 items). 3. (13) Read the code named "oscode.c" and answer the following questions. \#includespthread.h> \#include> int value =2; int main (int arge, char * argv[]) int pid; pthread_t tid; pthread_attr_t attr; pid = fork () if(pid =0) \{ pthread_attr_init(\&attr); pthread_create(\&tid,\&attr,runner,NULL); pthread_join(tid,NULL); printf("output_1: value =%d, value); ) else if (pid >0); printf("output_2: value =%d, value); 3 void *runner (void * param) value = value +6 pthread_exit(0); 1) Write down the command to compile and run this code. (4) 2) Will the parent process or the child process run first? (2) And why? (3) 3) Write the output of the parent process and the child process and present the reason. (4)