1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
/*
* Copyright (c) 2018 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef VPP_VCL_EVENT_H
#define VPP_VCL_EVENT_H
/**
* @file
* @brief VPP Communications Library (VCL) event handler.
*
* Declarations for generic event handling in VCL.
*/
#include <vppinfra/types.h>
#include <vppinfra/lock.h>
#include <pthread.h>
typedef union vce_event_key_
{
struct {
u32 eid;
u32 session_index;
};
u64 as_u64;
} vce_event_key_t;
typedef struct vce_event_
{
vce_event_key_t evk;
u32 refcnt;
void *data;
} vce_event_t;
typedef void (*vce_event_callback_t) (void *reg /*vce_event_handler_reg_t* */);
typedef struct vce_event_handler_reg_
{
vce_event_callback_t handler_fn;
pthread_mutex_t handler_lock;
pthread_cond_t handler_cond;
u32 ev_idx;
u32 replaced_handler_idx;
} vce_event_handler_reg_t;
typedef struct vce_event_thread_
{
pthread_t thread;
pthread_mutex_t generator_lock;
pthread_cond_t generator_cond;
u32 *event_index_fifo;
u8 recycle_event;
clib_spinlock_t events_lockp;
vce_event_t *vce_events; //pool
clib_spinlock_t handlers_lockp;
vce_event_handler_reg_t *vce_event_handlers; //pool
uword *handlers_index_by_event_key; //hash
} vce_event_thread_t;
/**
* @brief vce_generate_event
* - used to trigger an event in the event thread so that registered
* handlers are notified
*
* @param evt - vce_event_thread_t - event system state
* @param ev_idx - index to vce_event_thread_t vce_event pool
*
* @return success/failure rv
*/
int vce_generate_event (vce_event_thread_t *evt, u32 ev_idx);
/**
* @brief vce_clear_event()
* - removes event from event_pool
*
* @param evt - vce_event_thread_t - event system state
* @param ev - vce_event_t - event to remove
*/
void vce_clear_event (vce_event_thread_t *evt, vce_event_t *ev);
/**
* @brief vce_get_event_from_index()
*
* @param evt - vce_event_thread_t - event system state
* @param ev_idx - index to vce_event_thread_t vce_event pool
*
* @return vce_event_t *
*/
vce_event_t * vce_get_event_from_index(vce_event_thread_t *evt, u32 ev_idx);
/**
* @brief vce_register_handler
* - used by functions who need to be notified that an event has occurred
* on a vce_event_key_t (i.e. event type (enum) and sessionID)
* - if a handler already exists, the index to the old handler is stored
* inside the new handler for re-instatement on vce_unregister_handler()
* @param evt - vce_event_thread_t - event system state
* @param evk - vce_event_key_t current an eventID from enum in consumer and
* sessionID
* @param cb - vce_event_callback_t function to handle event
* @return vce_handler_reg_t - the function that needs event notification
* needs to block on a condvar mutex to reduce spin. That is in here.
*/
vce_event_handler_reg_t * vce_register_handler (vce_event_thread_t *evt,
vce_event_key_t *evk,
vce_event_callback_t cb);
/**
* @brief vce_unregister_handler
* - used by functions to remove need to be notified that an event has occurred
* on a vce_event_key_t (i.e. event type (enum) and sessionID)
* - if this handler replaced an existing one, re-instate it.
*
* @param evt - vce_event_thread_t - event system state
* @param ev - vce_event_t - event to remove
* @return success/failure rv
*/
int vce_unregister_handler (vce_event_thread_t *evt, vce_event_t *ev);
/**
* @brief vce_event_thread_fn
* - main event thread that waits on a generic condvar/mutex that a signal
* has been generated.
* - loops through all registered handlers for that vce_event_key_t
* (event enum + sessionID)
*
* @param arg - cast to type of event defined in consuming program.
* @return
*/
extern void * vce_event_thread_fn (void *arg);
/**
* @brief vce_start_event_thread
* - as name suggests. What is important is that vce_event_thread_t is allocated
* on the same heap as "everything else". ie use clib_mem_alloc.
* @param evt - vce_event_thread_t - event system state
* @param max_events - depth of event FIFO for max number of outstanding events.
* @return succes/failure
*/
int vce_start_event_thread (vce_event_thread_t *evt, u8 max_events);
#endif //VPP_VCL_EVENT_H
|
