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673867c357
There's no real reason to have a specific scheduler for applets anymore, so nuke it and just use tasks. This comes with some benefits, the first one being that applets cannot induce high latencies anymore since they share nice values with other tasks. Later it will be possible to configure the applets' nice value. The second benefit is that the applet scheduler was not very thread-friendly, having a big lock around it in prevision of this change. Thus applet-intensive workloads should now scale much better with threads. Some more improvement is possible now : some applets also use a task to handle timers and timeouts. These ones could now be simplified to use only one task.
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
/*
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* Functions managing applets
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*
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* Copyright 2000-2015 Willy Tarreau <w@1wt.eu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <common/config.h>
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#include <common/mini-clist.h>
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#include <proto/applet.h>
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#include <proto/channel.h>
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#include <proto/stream.h>
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#include <proto/stream_interface.h>
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#include <proto/task.h>
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unsigned int nb_applets = 0;
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struct task *task_run_applet(struct task *t, void *context, unsigned short state)
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{
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struct appctx *app = context;
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struct stream_interface *si = app->owner;
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if (app->state & APPLET_WANT_DIE) {
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__appctx_free(app);
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return NULL;
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}
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/* Now we'll try to allocate the input buffer. We wake up the
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* applet in all cases. So this is the applet responsibility to
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* check if this buffer was allocated or not. This let a chance
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* for applets to do some other processing if needed. */
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if (!channel_alloc_buffer(si_ic(si), &app->buffer_wait))
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si_applet_cant_put(si);
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/* We always pretend the applet can't get and doesn't want to
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* put, it's up to it to change this if needed. This ensures
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* that one applet which ignores any event will not spin.
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*/
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si_applet_cant_get(si);
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si_applet_stop_put(si);
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app->applet->fct(app);
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si_applet_wake_cb(si);
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channel_release_buffer(si_ic(si), &app->buffer_wait);
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return t;
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}
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