#include <stdio.h>
#include <uv.h>

Functions
void	reader (void *n)

void	writer (void *n)

int	main ()

Variables
uv_barrier_t	blocker

uv_rwlock_t	numlock

int	shared_num

Function Documentation

◆ main()

int main ( void )

Definition at line 37 of file main.c.

 {
     uv_barrier_init(&blocker, 4);
  
     shared_num = 0;
     uv_rwlock_init(&numlock);
  
     uv_thread_t threads[3];
  
     int thread_nums[] = {1, 2, 1};
     uv_thread_create(&threads[0], reader, &thread_nums[0]);
     uv_thread_create(&threads[1], reader, &thread_nums[1]);
  
     uv_thread_create(&threads[2], writer, &thread_nums[2]);
  
     uv_barrier_wait(&blocker);
     uv_barrier_destroy(&blocker);
  
     uv_rwlock_destroy(&numlock);
     return 0;
 }

References blocker, numlock, reader(), shared_num, threads, uv_barrier_destroy(), uv_barrier_init(), uv_barrier_wait(), uv_rwlock_destroy(), uv_rwlock_init(), uv_thread_create(), and writer().

◆ reader()

void reader ( void * n )

Definition at line 8 of file main.c.

 {
     int num = *(int *)n;
     int i;
     for (i = 0; i < 20; i++) {
         uv_rwlock_rdlock(&numlock);
         printf("Reader %d: acquired lock\n", num);
         printf("Reader %d: shared num = %d\n", num, shared_num);
         uv_rwlock_rdunlock(&numlock);
         printf("Reader %d: released lock\n", num);
     }
     uv_barrier_wait(&blocker);
 }

References blocker, i, n, num, numlock, printf(), shared_num, uv_barrier_wait(), uv_rwlock_rdlock(), and uv_rwlock_rdunlock().

Referenced by main().

◆ writer()

void writer ( void * n )

Definition at line 22 of file main.c.

 {
     int num = *(int *)n;
     int i;
     for (i = 0; i < 20; i++) {
         uv_rwlock_wrlock(&numlock);
         printf("Writer %d: acquired lock\n", num);
         shared_num++;
         printf("Writer %d: incremented shared num = %d\n", num, shared_num);
         uv_rwlock_wrunlock(&numlock);
         printf("Writer %d: released lock\n", num);
     }
     uv_barrier_wait(&blocker);
 }