1 /* This file is part of the Linux Trace Toolkit viewer
2 * Copyright (C) 2003-2004 Michel Dagenais
4 * 25/05/2004 Mathieu Desnoyers : Hook priorities
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License Version 2 as
8 * published by the Free Software Foundation;
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
25 #include <ltt/compiler.h>
27 /* A hook is a function to call with the supplied hook data, and with
28 call site specific data (e.g., hooks for events are called with a
29 pointer to the current event). */
31 typedef gboolean (*LttvHook
)(void *hook_data
, void *call_data
);
34 /* A list of hooks allows registering hooks to be called later. */
36 typedef GArray LttvHooks
;
38 /* A priority associated with each hook, from -19 (high prio) to 20 (low prio)
39 * 0 being the default priority.
41 * Priority ordering is done in the lttv_hooks_add and lttv_hooks_add_list
42 * functions. Hook removal does not change list order.
45 #define LTTV_PRIO_DEFAULT 50
46 #define LTTV_PRIO_HIGH 0
47 #define LTTV_PRIO_LOW 99
49 typedef gint LttvHookPrio
;
51 /* Create and destroy a list of hooks */
53 LttvHooks
*lttv_hooks_new();
55 void lttv_hooks_destroy(LttvHooks
*h
);
58 /* Add a hook and its hook data to the list */
60 void lttv_hooks_add(LttvHooks
*h
, LttvHook f
, void *hook_data
, LttvHookPrio p
);
63 /* Add a list of hooks to the list h */
65 void lttv_hooks_add_list(LttvHooks
*h
, const LttvHooks
*list
);
68 /* Remove a hook from the list. Return the hook data. */
70 void *lttv_hooks_remove(LttvHooks
*h
, LttvHook f
);
73 /* Remove a hook from the list checking that the hook data match. */
75 void lttv_hooks_remove_data(LttvHooks
*h
, LttvHook f
, void *hook_data
);
78 /* Remove a list of hooks from the hooks list in h. */
80 void lttv_hooks_remove_list(LttvHooks
*h
, LttvHooks
*list
);
83 /* Return the number of hooks in the list */
85 unsigned lttv_hooks_number(LttvHooks
*h
);
88 /* Return the hook at the specified position in the list.
89 * *f and *hook_data are NULL if no hook exists at that position. */
91 void lttv_hooks_get(LttvHooks
*h
, unsigned i
, LttvHook
*f
, void **hook_data
,
95 /* Remove the specified hook. The position of the following hooks may change */
96 /* The hook is removed from the list event if its ref_count is higher than 1 */
98 void lttv_hooks_remove_by_position(LttvHooks
*h
, unsigned i
);
101 /* Call all the hooks in the list, each with its hook data,
102 with the specified call data, in priority order. Return TRUE if one hook
105 gboolean
lttv_hooks_call(LttvHooks
*h
, void *call_data
);
108 /* Call the hooks in the list in priority order until one returns true,
109 * in which case TRUE is returned. */
111 gboolean
lttv_hooks_call_check(LttvHooks
*h
, void *call_data
);
114 /* Call hooks from two lists in priority order. If priority is the same,
115 * hooks from h1 are called first. */
117 gboolean
lttv_hooks_call_merge(LttvHooks
*h1
, void *call_data1
,
118 LttvHooks
*h2
, void *call_data2
);
120 gboolean
lttv_hooks_call_check_merge(LttvHooks
*h1
, void *call_data1
,
121 LttvHooks
*h2
, void *call_data2
);
123 /* Sometimes different hooks need to be called based on the case. The
124 case is represented by an unsigned integer id */
126 typedef struct _LttvHooksById
{
131 /* macro to calculate the hook ID of a facility/event pair. */
132 #define GET_HOOK_ID(fac_id, ev_id) \
133 ( (guint)fac_id | ((guint)ev_id << FACILITIES_BITS) )
135 /* Create and destroy a hooks by id list */
137 LttvHooksById
*lttv_hooks_by_id_new();
139 void lttv_hooks_by_id_destroy(LttvHooksById
*h
);
142 /* Obtain the hooks for a given id, creating a list if needed */
144 LttvHooks
*lttv_hooks_by_id_find(LttvHooksById
*h
, unsigned id
);
147 /* Return an id larger than any for which a list exists. */
149 unsigned lttv_hooks_by_id_max_id(LttvHooksById
*h
);
152 /* Get the list of hooks for an id, NULL if none exists */
154 static inline LttvHooks
*lttv_hooks_by_id_get(LttvHooksById
*h
, unsigned id
)
157 if(likely(id
< h
->index
->len
)) ret
= h
->index
->pdata
[id
];
164 /* Remove the list of hooks associated with an id */
166 void lttv_hooks_by_id_remove(LttvHooksById
*h
, unsigned id
);
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