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/* Copyright (c) 2012 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef WORKER_H
#define WORKER_H 1
/* Worker processes.
*
* Thes functions allow an OVS daemon to fork off a "worker process" to do
* tasks that may unavoidably block in the kernel. The worker executes remote
* procedure calls on behalf of the main process.
*
* Tasks that may unavoidably block in the kernel include writes to regular
* files, sends to Generic Netlink sockets (which as of this writing use a
* global lock), and other unusual operations.
*
* The worker functions *will* block if the finite buffer between a main
* process and its worker process fills up.
*/
#include <stdbool.h>
#include <stddef.h>
#include "compiler.h"
struct iovec;
struct ofpbuf;
/* The main process calls this function to start a worker. */
void worker_start(void);
/* Interface for main process to interact with the worker. */
typedef void worker_request_func(struct ofpbuf *request,
const int fds[], size_t n_fds);
typedef void worker_reply_func(struct ofpbuf *reply,
const int fds[], size_t n_fds, void *aux);
bool worker_is_running(void);
void worker_run(void);
void worker_wait(void);
void worker_request(const void *data, size_t size,
const int fds[], size_t n_fds,
worker_request_func *request_cb,
worker_reply_func *reply_cb, void *aux);
void worker_request_iovec(const struct iovec *iovs, size_t n_iovs,
const int fds[], size_t n_fds,
worker_request_func *request_cb,
worker_reply_func *reply_cb, void *aux);
/* Interfaces for RPC implementations (running in the worker process). */
void worker_reply(const void *data, size_t size,
const int fds[], size_t n_fds);
void worker_reply_iovec(const struct iovec *iovs, size_t n_iovs,
const int fds[], size_t n_fds);
#endif /* worker.h */
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