进程间可以使用读写锁来同步吗？

sunnie · June 12, 2008, 10:58am

进程间有共享内存，想要用读写锁来保护，可以吗？具体怎么使用呢？

nakeyfish · June 12, 2008, 3:29pm

应该可以。
把RWLock放到共享内存里就可以了。

pthread_rwlock_t * rwl;
rwl = (pthread_rwlock_t *)shmem_ptr;

sunnie · June 13, 2008, 1:14am

shmem_ptr是什么意思？具体指什么？

nakeyfish · June 13, 2008, 1:54am

    shmem_t *shmem_ptr;
    
    /* create the shared memory object */
    fd = shm_open( argv[1], O_RDWR | O_CREAT, S_IRWXU );
    
    /* set the size of the shared memory object */
    ftruncate( fd, sizeof(shmem_t) );
    
    /* get a pointer to a piece of the shared memory */
    shmem_ptr = mmap( 0, sizeof(shmem_t), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0 );

    ......