Exemplos de lock_shared em C++ (Cpp)

Exemplo n.º 1

Arquivo: mappedfile.c Projeto: martinpal/cyrus-imapd

EXPORTED int mappedfile_readlock(struct mappedfile *mf)
{
    struct stat sbuf, sbuffile;
    int newfd = -1;

    assert(mf->lock_status == MF_UNLOCKED);
    assert(mf->fd != -1);
    assert(!mf->dirty);

    for (;;) {
	if (lock_shared(mf->fd, mf->fname) < 0) {
	    syslog(LOG_ERR, "IOERROR: lock_shared %s: %m", mf->fname);
	    return -EIO;
	}

	if (fstat(mf->fd, &sbuf) == -1) {
	    syslog(LOG_ERR, "IOERROR: fstat %s: %m", mf->fname);
	    lock_unlock(mf->fd, mf->fname);
	    return -EIO;
	}

	if (stat(mf->fname, &sbuffile) == -1) {
	    syslog(LOG_ERR, "IOERROR: stat %s: %m", mf->fname);
	    lock_unlock(mf->fd, mf->fname);
	    return -EIO;
	}
	if (sbuf.st_ino == sbuffile.st_ino) break;

	newfd = open(mf->fname, O_RDWR, 0644);
	if (newfd == -1) {
	    syslog(LOG_ERR, "IOERROR: open %s: %m", mf->fname);
	    lock_unlock(mf->fd, mf->fname);
	    return -EIO;
	}

	dup2(newfd, mf->fd);
	close(newfd);
    }

    mf->lock_status = MF_READLOCKED;

    /* XXX - can we guarantee the fd isn't reused? */
    if (mf->map_ino != sbuf.st_ino) {
	buf_free(&mf->map_buf);
    }

    _ensure_mapped(mf, sbuf.st_size, /*update*/0);

    return 0;
}

Exemplo n.º 2

Arquivo: shared_spinlock.cpp Projeto: ariosx/actor-framework

void shared_spinlock::lock_upgrade() {
  lock_shared();
}