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Sources/libubox/runqueue.h

  1 /*
  2  * runqueue.c - a simple task queueing/completion tracking helper
  3  *
  4  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
  5  *
  6  * Permission to use, copy, modify, and/or distribute this software for any
  7  * purpose with or without fee is hereby granted, provided that the above
  8  * copyright notice and this permission notice appear in all copies.
  9  *
 10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 17  */
 18 
 19 #ifndef __LIBUBOX_RUNQUEUE_H
 20 #define __LIBUBOX_RUNQUEUE_H
 21 
 22 #include "list.h"
 23 #include "safe_list.h"
 24 #include "uloop.h"
 25 
 26 struct runqueue;
 27 struct runqueue_task;
 28 struct runqueue_task_type;
 29 
 30 struct runqueue {
 31         struct safe_list tasks_active;
 32         struct safe_list tasks_inactive;
 33         struct uloop_timeout timeout;
 34 
 35         int running_tasks;
 36         int max_running_tasks;
 37         bool stopped;
 38         bool empty;
 39 
 40         /* called when the runqueue is emptied */
 41         void (*empty_cb)(struct runqueue *q);
 42 };
 43 
 44 struct runqueue_task_type {
 45         const char *name;
 46 
 47         /*
 48          * called when a task is requested to run
 49          *
 50          * The task is removed from the list before this callback is run. It
 51          * can re-arm itself using runqueue_task_add.
 52          */
 53         void (*run)(struct runqueue *q, struct runqueue_task *t);
 54 
 55         /*
 56          * called to request cancelling a task
 57          *
 58          * int type is used as an optional hint for the method to be used when
 59          * cancelling the task, e.g. a signal number for processes. Calls
 60          * runqueue_task_complete when done.
 61          */
 62         void (*cancel)(struct runqueue *q, struct runqueue_task *t, int type);
 63 
 64         /*
 65          * called to kill a task. must not make any calls to runqueue_task_complete,
 66          * it has already been removed from the list.
 67          */
 68         void (*kill)(struct runqueue *q, struct runqueue_task *t);
 69 };
 70 
 71 struct runqueue_task {
 72         struct safe_list list;
 73         const struct runqueue_task_type *type;
 74         struct runqueue *q;
 75 
 76         void (*complete)(struct runqueue *q, struct runqueue_task *t);
 77 
 78         struct uloop_timeout timeout;
 79         int run_timeout;
 80         int cancel_timeout;
 81         int cancel_type;
 82 
 83         bool queued;
 84         bool running;
 85         bool cancelled;
 86 };
 87 
 88 struct runqueue_process {
 89         struct runqueue_task task;
 90         struct uloop_process proc;
 91 };
 92 
 93 #define RUNQUEUE_INIT(_name, _max_running) { \
 94                 .tasks_active = SAFE_LIST_INIT(_name.tasks_active), \
 95                 .tasks_inactive = SAFE_LIST_INIT(_name.tasks_inactive), \
 96                 .max_running_tasks = _max_running \
 97         }
 98 
 99 #define RUNQUEUE(_name, _max_running) \
100         struct runqueue _name = RUNQUEUE_INIT(_name, _max_running)
101 
102 void runqueue_init(struct runqueue *q);
103 void runqueue_cancel(struct runqueue *q);
104 void runqueue_cancel_active(struct runqueue *q);
105 void runqueue_cancel_pending(struct runqueue *q);
106 void runqueue_kill(struct runqueue *q);
107 
108 void runqueue_stop(struct runqueue *q);
109 void runqueue_resume(struct runqueue *q);
110 
111 void runqueue_task_add(struct runqueue *q, struct runqueue_task *t, bool running);
112 void runqueue_task_add_first(struct runqueue *q, struct runqueue_task *t, bool running);
113 void runqueue_task_complete(struct runqueue_task *t);
114 
115 void runqueue_task_cancel(struct runqueue_task *t, int type);
116 void runqueue_task_kill(struct runqueue_task *t);
117 
118 void runqueue_process_add(struct runqueue *q, struct runqueue_process *p, pid_t pid);
119 
120 /* to be used only from runqueue_process callbacks */
121 void runqueue_process_cancel_cb(struct runqueue *q, struct runqueue_task *t, int type);
122 void runqueue_process_kill_cb(struct runqueue *q, struct runqueue_task *t);
123 
124 #endif
125 

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