└── semaphore


/semaphore:
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 1 | #define BUFFERSIZE 10 
 2 | int mutex,n,empty,full=0,item,item1; 
 3 | int buffer[20]; 
 4 | int in=0,out=0,mutex=1; 
 5 | void wait(int s) 
 6 | { 
 7 | }
 8 |  while(s<0) 
 9 | { 
10 | } 
11 | s--; 
12 | printf(“\nCannot add an item\n”); exit(0); 
13 | void signal(int s) 
14 | { 
15 | } 
16 | s++; 
17 | void producer() 
18 | { 
19 | } 
20 | do 
21 | { 
22 | } 
23 | wait (empty); 
24 | wait(mutex); 
25 | printf(“\nEnter an item:”); 
26 | scanf(“%d”,&item); 
27 | buffer[in]=item; 
28 | in=in+1; 
29 | signal(mutex); 
30 | signal(full); 
31 | while(in<n); 
32 | void consumer() 
33 | { 
34 | } 
35 | do 
36 | { 
37 | } 
38 | wait(full); 
39 | wait(mutex); 
40 | item1=buffer[out]; 
41 | printf(“\nConsumed item =%d”,item1); out=out+1; 
42 | signal(mutex); 
43 | signal(empty); 
44 | while(out<n); 
45 | void main() 
46 | { 
47 | printf(“Enter the value of n:”); 
48 | scanf(“%d “,&n); 
49 | empty=n; 
50 | while(in<n) 
51 | producer(); 
52 | while(in!=out) 
53 | consumer(); 
54 | } 
55 | 


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