| /* |
| * Virtio 9p backend |
| * |
| * Copyright IBM, Corp. 2010 |
| * |
| * Authors: |
| * Harsh Prateek Bora <harsh@linux.vnet.ibm.com> |
| * Venkateswararao Jujjuri(JV) <jvrao@linux.vnet.ibm.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2. See |
| * the COPYING file in the top-level directory. |
| * |
| */ |
| |
| #include "fsdev/qemu-fsdev.h" |
| #include "qemu-thread.h" |
| #include "qemu-coroutine.h" |
| #include "virtio-9p-coth.h" |
| |
| /* v9fs glib thread pool */ |
| static V9fsThPool v9fs_pool; |
| |
| void co_run_in_worker_bh(void *opaque) |
| { |
| Coroutine *co = opaque; |
| g_thread_pool_push(v9fs_pool.pool, co, NULL); |
| } |
| |
| static void v9fs_qemu_process_req_done(void *arg) |
| { |
| char byte; |
| ssize_t len; |
| Coroutine *co; |
| |
| do { |
| len = read(v9fs_pool.rfd, &byte, sizeof(byte)); |
| } while (len == -1 && errno == EINTR); |
| |
| while ((co = g_async_queue_try_pop(v9fs_pool.completed)) != NULL) { |
| qemu_coroutine_enter(co, NULL); |
| } |
| } |
| |
| static void v9fs_thread_routine(gpointer data, gpointer user_data) |
| { |
| ssize_t len; |
| char byte = 0; |
| Coroutine *co = data; |
| |
| qemu_coroutine_enter(co, NULL); |
| |
| g_async_queue_push(v9fs_pool.completed, co); |
| do { |
| len = write(v9fs_pool.wfd, &byte, sizeof(byte)); |
| } while (len == -1 && errno == EINTR); |
| } |
| |
| int v9fs_init_worker_threads(void) |
| { |
| int ret = 0; |
| int notifier_fds[2]; |
| V9fsThPool *p = &v9fs_pool; |
| sigset_t set, oldset; |
| |
| sigfillset(&set); |
| /* Leave signal handling to the iothread. */ |
| pthread_sigmask(SIG_SETMASK, &set, &oldset); |
| |
| if (qemu_pipe(notifier_fds) == -1) { |
| ret = -1; |
| goto err_out; |
| } |
| p->pool = g_thread_pool_new(v9fs_thread_routine, p, -1, FALSE, NULL); |
| if (!p->pool) { |
| ret = -1; |
| goto err_out; |
| } |
| p->completed = g_async_queue_new(); |
| if (!p->completed) { |
| /* |
| * We are going to terminate. |
| * So don't worry about cleanup |
| */ |
| ret = -1; |
| goto err_out; |
| } |
| p->rfd = notifier_fds[0]; |
| p->wfd = notifier_fds[1]; |
| |
| fcntl(p->rfd, F_SETFL, O_NONBLOCK); |
| fcntl(p->wfd, F_SETFL, O_NONBLOCK); |
| |
| qemu_set_fd_handler(p->rfd, v9fs_qemu_process_req_done, NULL, NULL); |
| err_out: |
| pthread_sigmask(SIG_SETMASK, &oldset, NULL); |
| return ret; |
| } |