static int aio_worker(void *arg)
{
RawPosixAIOData *aiocb = arg;
ssize_t ret = 0;
switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
case QEMU_AIO_READ:
ret = handle_aiocb_rw(aiocb);
if (ret >= 0 && ret < aiocb->aio_nbytes && aiocb->bs->growable) {
iov_memset(aiocb->aio_iov, aiocb->aio_niov, ret,
0, aiocb->aio_nbytes - ret);
ret = aiocb->aio_nbytes;
}
if (ret == aiocb->aio_nbytes) {
ret = 0;
} else if (ret >= 0 && ret < aiocb->aio_nbytes) {
ret = -EINVAL;
}
break;
case QEMU_AIO_WRITE:
ret = handle_aiocb_rw(aiocb);
if (ret == aiocb->aio_nbytes) {
ret = 0;
} else if (ret >= 0 && ret < aiocb->aio_nbytes) {
ret = -EINVAL;
}
break;
case QEMU_AIO_FLUSH:
ret = handle_aiocb_flush(aiocb);
break;
case QEMU_AIO_IOCTL:
ret = handle_aiocb_ioctl(aiocb);
break;
case QEMU_AIO_DISCARD:
ret = handle_aiocb_discard(aiocb);
break;
default:
fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
ret = -EINVAL;
break;
}
g_slice_free(RawPosixAIOData, aiocb);
return ret;
}
static void *aio_thread(void *unused)
{
pid_t pid;
sigset_t set;
pid = getpid();
/* block all signals */
if (sigfillset(&set)) die("sigfillset");
if (sigprocmask(SIG_BLOCK, &set, NULL)) die("sigprocmask");
while (1) {
struct qemu_paiocb *aiocb;
size_t ret = 0;
qemu_timeval tv;
struct timespec ts;
qemu_gettimeofday(&tv);
ts.tv_sec = tv.tv_sec + 10;
ts.tv_nsec = 0;
mutex_lock(&lock);
while (TAILQ_EMPTY(&request_list) &&
!(ret == ETIMEDOUT)) {
ret = cond_timedwait(&cond, &lock, &ts);
}
if (TAILQ_EMPTY(&request_list))
break;
aiocb = TAILQ_FIRST(&request_list);
TAILQ_REMOVE(&request_list, aiocb, node);
aiocb->active = 1;
idle_threads--;
mutex_unlock(&lock);
switch (aiocb->aio_type) {
case QEMU_PAIO_READ:
case QEMU_PAIO_WRITE:
ret = handle_aiocb_rw(aiocb);
break;
case QEMU_PAIO_IOCTL:
ret = handle_aiocb_ioctl(aiocb);
break;
default:
fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
ret = -EINVAL;
break;
}
mutex_lock(&lock);
aiocb->ret = ret;
idle_threads++;
mutex_unlock(&lock);
if (kill(pid, aiocb->ev_signo)) die("kill failed");
}
idle_threads--;
cur_threads--;
mutex_unlock(&lock);
return NULL;
}