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