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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
#include <assert.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <uv.h>
#include "nvim/os/event.h"
#include "nvim/os/input.h"
#include "nvim/msgpack_rpc/defs.h"
#include "nvim/msgpack_rpc/channel.h"
#include "nvim/msgpack_rpc/server.h"
#include "nvim/msgpack_rpc/helpers.h"
#include "nvim/os/signal.h"
#include "nvim/os/rstream.h"
#include "nvim/os/wstream.h"
#include "nvim/os/job.h"
#include "nvim/vim.h"
#include "nvim/memory.h"
#include "nvim/misc2.h"
#include "nvim/term.h"
#include "nvim/screen.h"
#include "nvim/lib/klist.h"
// event will be cleaned up after it gets processed
#define _destroy_event(x) // do nothing
KLIST_INIT(Event, Event, _destroy_event)
typedef struct {
bool timed_out;
int ms;
uv_timer_t *timer;
} TimerData;
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "os/event.c.generated.h"
#endif
// deferred_events: Events that should be processed as the K_EVENT special key
// immediate_events: Events that should be processed after exiting libuv event
// loop(to avoid recursion), but before returning from
// `event_poll`
static klist_t(Event) *deferred_events = NULL, *immediate_events = NULL;
static int deferred_events_allowed = 0;
void event_init(void)
{
// Initialize the event queues
deferred_events = kl_init(Event);
immediate_events = kl_init(Event);
// early msgpack-rpc initialization
msgpack_rpc_init_method_table();
msgpack_rpc_helpers_init();
wstream_init();
// Initialize input events
input_init();
input_start();
// Timer to wake the event loop if a timeout argument is passed to
// `event_poll`
// Signals
signal_init();
// Jobs
job_init();
// finish mspgack-rpc initialization
channel_init();
server_init();
}
void event_teardown(void)
{
if (!deferred_events) {
// Not initialized(possibly a --version invocation)
return;
}
channel_teardown();
job_teardown();
server_teardown();
signal_teardown();
input_stop();
input_teardown();
// this last `uv_run` will return after all handles are stopped, it will
// also take care of finishing any uv_close calls made by other *_teardown
// functions.
uv_run(uv_default_loop(), UV_RUN_DEFAULT);
// abort that if we left unclosed handles
if (uv_loop_close(uv_default_loop())) {
abort();
}
}
// Wait for some event
void event_poll(int ms)
{
static int recursive = 0;
if (recursive++) {
abort(); // Should not re-enter uv_run
}
uv_run_mode run_mode = UV_RUN_ONCE;
uv_timer_t timer;
uv_prepare_t timer_prepare;
TimerData timer_data = {.ms = ms, .timed_out = false, .timer = &timer};
if (ms > 0) {
uv_timer_init(uv_default_loop(), &timer);
// This prepare handle that actually starts the timer
uv_prepare_init(uv_default_loop(), &timer_prepare);
// Timeout passed as argument to the timer
timer.data = &timer_data;
// We only start the timer after the loop is running, for that we
// use a prepare handle(pass the interval as data to it)
timer_prepare.data = &timer_data;
uv_prepare_start(&timer_prepare, timer_prepare_cb);
} else if (ms == 0) {
// For ms == 0, we need to do a non-blocking event poll by
// setting the run mode to UV_RUN_NOWAIT.
run_mode = UV_RUN_NOWAIT;
}
loop(run_mode);
if (ms > 0) {
// Ensure the timer-related handles are closed and run the event loop
// once more to let libuv perform it's cleanup
uv_timer_stop(&timer);
uv_prepare_stop(&timer_prepare);
uv_close((uv_handle_t *)&timer, NULL);
uv_close((uv_handle_t *)&timer_prepare, NULL);
loop(UV_RUN_NOWAIT);
}
recursive--; // Can re-enter uv_run now
process_events_from(immediate_events);
}
bool event_has_deferred(void)
{
return deferred_events_allowed && !kl_empty(deferred_events);
}
void event_enable_deferred(void)
{
++deferred_events_allowed;
}
void event_disable_deferred(void)
{
--deferred_events_allowed;
}
// Queue an event
void event_push(Event event, bool deferred)
{
*kl_pushp(Event, deferred ? deferred_events : immediate_events) = event;
}
void event_process(void)
{
process_events_from(deferred_events);
if (must_redraw) {
update_screen(0);
out_flush();
}
}
static void process_events_from(klist_t(Event) *queue)
{
Event event;
while (kl_shift(Event, queue, &event) == 0) {
event.handler(event);
}
}
// Set a flag in the `event_poll` loop for signaling of a timeout
static void timer_cb(uv_timer_t *handle)
{
TimerData *data = handle->data;
data->timed_out = true;
}
static void timer_prepare_cb(uv_prepare_t *handle)
{
TimerData *data = handle->data;
assert(data->ms > 0);
uv_timer_start(data->timer, timer_cb, (uint32_t)data->ms, 0);
uv_prepare_stop(handle);
}
static void loop(uv_run_mode run_mode)
{
DLOG("Enter event loop");
uv_run(uv_default_loop(), run_mode);
DLOG("Exit event loop");
}
|
