lws-threadpool.h

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/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010 - 2020 Andy Green <andy@warmcat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
 
 
struct lws_threadpool;
struct lws_threadpool_task;
 
enum lws_threadpool_task_status {
        LWS_TP_STATUS_QUEUED,
        LWS_TP_STATUS_RUNNING,
        LWS_TP_STATUS_SYNCING,
        LWS_TP_STATUS_STOPPING,
        LWS_TP_STATUS_FINISHED, /* lws_threadpool_task_status() frees task */
        LWS_TP_STATUS_STOPPED, /* lws_threadpool_task_status() frees task */
};
 
enum lws_threadpool_task_return {
        LWS_TP_RETURN_CHECKING_IN,
        LWS_TP_RETURN_SYNC,
        LWS_TP_RETURN_FINISHED,
        LWS_TP_RETURN_STOPPED,
 
        /* OR on to indicate this task wishes to outlive its wsi */
        LWS_TP_RETURN_FLAG_OUTLIVE = 64
};
 
struct lws_threadpool_create_args {
        int threads;
        int max_queue_depth;
};
 
struct lws_threadpool_task_args {
#if defined(LWS_WITH_SECURE_STREAMS)
        struct lws_ss_handle *ss; 
#endif
        struct lws *wsi;        
        void *user;             
        const char *name;       
        char async_task;        
        enum lws_threadpool_task_return (*task)(void *user,
                                        enum lws_threadpool_task_status s);
        void (*cleanup)(struct lws *wsi, void *user);
};
 
LWS_VISIBLE LWS_EXTERN struct lws_threadpool *
lws_threadpool_create(struct lws_context *context,
                      const struct lws_threadpool_create_args *args,
                      const char *format, ...) LWS_FORMAT(3);
 
LWS_VISIBLE LWS_EXTERN void
lws_threadpool_finish(struct lws_threadpool *tp);
 
LWS_VISIBLE LWS_EXTERN void
lws_threadpool_destroy(struct lws_threadpool *tp);
 
LWS_VISIBLE LWS_EXTERN struct lws_threadpool_task *
lws_threadpool_enqueue(struct lws_threadpool *tp,
                       const struct lws_threadpool_task_args *args,
                       const char *format, ...) LWS_FORMAT(3);
 
LWS_VISIBLE LWS_EXTERN int
lws_threadpool_dequeue(struct lws *wsi) LWS_WARN_DEPRECATED;
 
LWS_VISIBLE LWS_EXTERN int
lws_threadpool_dequeue_task(struct lws_threadpool_task *task);
 
 
LWS_VISIBLE LWS_EXTERN enum lws_threadpool_task_status
lws_threadpool_task_status_wsi(struct lws *wsi,
                               struct lws_threadpool_task **task, void **user)
                                LWS_WARN_DEPRECATED;
 
LWS_VISIBLE LWS_EXTERN enum lws_threadpool_task_status
lws_threadpool_task_status(struct lws_threadpool_task *task, void **user);
 
LWS_VISIBLE LWS_EXTERN enum lws_threadpool_task_status
lws_threadpool_task_status_noreap(struct lws_threadpool_task *task);
 
LWS_VISIBLE LWS_EXTERN void
lws_threadpool_task_sync(struct lws_threadpool_task *task, int stop);
 
LWS_VISIBLE LWS_EXTERN void
lws_threadpool_dump(struct lws_threadpool *tp);
 
 
 
LWS_VISIBLE LWS_EXTERN struct lws_threadpool_task *
lws_threadpool_get_task_wsi(struct lws *wsi);
 
#if defined(LWS_WITH_SECURE_STREAMS)
LWS_VISIBLE LWS_EXTERN struct lws_threadpool_task *
lws_threadpool_get_task_ss(struct lws_ss_handle *ss);
#endif
 
 
LWS_VISIBLE LWS_EXTERN int
lws_threadpool_foreach_task_wsi(struct lws *wsi, void *user,
                                int (*cb)(struct lws_threadpool_task *task,
                                          void *user));
 
#if defined(LWS_WITH_SECURE_STREAMS)
LWS_VISIBLE LWS_EXTERN int
lws_threadpool_foreach_task_ss(struct lws_ss_handle *ss, void *user,
                int (*cb)(struct lws_threadpool_task *task, void *user));
#endif