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/*
* include/proto/applet.h
* This file contains applet function prototypes
*
* Copyright (C) 2000-2015 Willy Tarreau - w@1wt.eu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _PROTO_APPLET_H
#define _PROTO_APPLET_H
#include <stdlib.h>
#include <common/config.h>
#include <common/mini-clist.h>
#include <types/applet.h>
#include <proto/connection.h>
#include <proto/task.h>
extern unsigned int nb_applets;
struct task *task_run_applet(struct task *t, void *context, unsigned short state);
static int inline appctx_res_wakeup(struct appctx *appctx);
/* Initializes all required fields for a new appctx. Note that it does the
* minimum acceptable initialization for an appctx. This means only the
* 3 integer states st0, st1, st2 and the chunk used to gather unfinished
* commands are zeroed
*/
static inline void appctx_init(struct appctx *appctx, unsigned long thread_mask)
{
appctx->st0 = appctx->st1 = appctx->st2 = 0;
appctx->chunk = NULL;
appctx->io_release = NULL;
appctx->thread_mask = thread_mask;
appctx->state = 0;
}
/* Tries to allocate a new appctx and initialize its main fields. The appctx
* is returned on success, NULL on failure. The appctx must be released using
* pool_free(connection) or appctx_free(), since it's allocated from the
* connection pool. <applet> is assigned as the applet, but it can be NULL.
*/
static inline struct appctx *appctx_new(struct applet *applet, unsigned long thread_mask)
{
struct appctx *appctx;
appctx = pool_alloc(pool_head_connection);
if (likely(appctx != NULL)) {
appctx->obj_type = OBJ_TYPE_APPCTX;
appctx->applet = applet;
appctx_init(appctx, thread_mask);
appctx->t = task_new(thread_mask);
if (unlikely(appctx->t == NULL)) {
pool_free(pool_head_connection, appctx);
return NULL;
}
appctx->t->process = task_run_applet;
appctx->t->context = appctx;
LIST_INIT(&appctx->buffer_wait.list);
appctx->buffer_wait.target = appctx;
appctx->buffer_wait.wakeup_cb = (int (*)(void *))appctx_res_wakeup;
HA_ATOMIC_ADD(&nb_applets, 1);
}
return appctx;
}
/* Releases an appctx previously allocated by appctx_new(). Note that
* we share the connection pool.
*/
static inline void __appctx_free(struct appctx *appctx)
{
task_delete(appctx->t);
task_free(appctx->t);
if (!LIST_ISEMPTY(&appctx->buffer_wait.list)) {
HA_SPIN_LOCK(BUF_WQ_LOCK, &buffer_wq_lock);
LIST_DEL(&appctx->buffer_wait.list);
LIST_INIT(&appctx->buffer_wait.list);
HA_SPIN_UNLOCK(BUF_WQ_LOCK, &buffer_wq_lock);
}
pool_free(pool_head_connection, appctx);
HA_ATOMIC_SUB(&nb_applets, 1);
}
static inline void appctx_free(struct appctx *appctx)
{
/* The task is supposed to be run on this thread, so we can just
* check if it's running already (or about to run) or not
*/
if (!(appctx->t->state & TASK_RUNNING))
__appctx_free(appctx);
else {
/* if it's running, or about to run, defer the freeing
* until the callback is called.
*/
appctx->state |= APPLET_WANT_DIE;
task_wakeup(appctx->t, TASK_WOKEN_OTHER);
}
}
/* wakes up an applet when conditions have changed */
static inline void appctx_wakeup(struct appctx *appctx)
{
task_wakeup(appctx->t, TASK_WOKEN_OTHER);
}
/* Callback used to wake up an applet when a buffer is available. The applet
* <appctx> is woken up is if it is not already in the list of "active"
* applets. This functions returns 1 is the stream is woken up, otherwise it
* returns 0. If task is running we request we check if woken was already
* requested */
static inline int appctx_res_wakeup(struct appctx *appctx)
{
int ret;
/* To detect if we have already been waken or not, we now that
* if the state contains TASK_RUNNING, but not just TASK_RUNNING.
* This is racy, but that's OK. At worst we will wake a little more
* tasks than necessary when a buffer is available.
*/
ret = ((appctx->state & TASK_RUNNING) != 0) &&
((appctx->state != TASK_RUNNING));
task_wakeup(appctx->t, TASK_WOKEN_OTHER);
return ret;
}
#endif /* _PROTO_APPLET_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/