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4. Short-answer Questions (25) 1.(5) Describe the relationship between user threads and kernel threads. 2.(5) What is deadlock? List the four conditions which will lead to a deadlock. 3.(5) Describe the definition of race condition. Show in detail an example in which race condition happens. 4. (5) What is critical section? How to solve the critical section problem? 5. Read the code "test.c" below and answer questions. 1) Write the command to compile this code thus to generate an executable file named temp. 2) Show the results of running this code and explain the reason behind. int main(void) { pid_t pid; int count=0; count=count + 1; pid=fork(); if(pid=0){ count = count +5; printf("part 1: count=%d ", count); execlp("/bin/ls", "Is", NULL); printf("part 1, pid is %d ", getpid()); } else if(pid>0){ count = count +7; printf("part 2: count=%d ",count); execlp("/bin/cp", "cp", "test.c", "myfile", NULL); }