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/*
* 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 "qemu-char.h"
#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);
/* init thread system if not already initialized */
if (!g_thread_get_initialized()) {
g_thread_init(NULL);
}
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;
}
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