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91 lines
2.6 KiB
C
91 lines
2.6 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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/* Callback used to wake up an applet when a buffer is available. The applet
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* <appctx> is woken up if an input buffer was requested for the associated
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* stream interface. In this case the buffer is immediately allocated and the
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* function returns 1. Otherwise it returns 0. Note that this automatically
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* covers multiple wake-up attempts by ensuring that the same buffer will not
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* be accounted for multiple times.
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*/
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int appctx_buf_available(void *arg)
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{
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struct appctx *appctx = arg;
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struct stream_interface *si = appctx->owner;
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/* allocation requested ? */
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if (!(si->flags & SI_FL_RXBLK_BUFF))
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return 0;
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si_rx_buff_rdy(si);
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/* was already allocated another way ? if so, don't take this one */
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if (c_size(si_ic(si)) || si_ic(si)->pipe)
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return 0;
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/* allocation possible now ? */
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if (!b_alloc_margin(&si_ic(si)->buf, global.tune.reserved_bufs)) {
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si_rx_buff_blk(si);
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return 0;
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}
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task_wakeup(appctx->t, TASK_WOKEN_RES);
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return 1;
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}
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/* Default applet handler */
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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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/* 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_cant_get(si);
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si_rx_endp_done(si);
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/* Now we'll try to allocate the input buffer. We wake up the applet in
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* all cases. So this is the applet's responsibility to check if this
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* buffer was allocated or not. This leaves a chance for applets to do
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* some other processing if needed. The applet doesn't have anything to
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* do if it needs the buffer, it will be called again upon readiness.
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*/
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if (!si_alloc_ibuf(si, &app->buffer_wait))
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si_rx_endp_more(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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