Repository navigation
Expand file tree
/
Copy pathpicoev.h
More file actions
404 lines (366 loc) · 12.8 KB
/
Copy pathpicoev.h
File metadata and controls
404 lines (366 loc) · 12.8 KB
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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
/*
* Copyright (c) 2009, Cybozu Labs, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of the <ORGANIZATION> nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef picoev_h
#define picoev_h
#ifdef __cplusplus
extern "C" {
# define PICOEV_INLINE inline
#else
# define PICOEV_INLINE static __inline__
#endif
#include "meinheld.h"
#include <assert.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include "time_cache.h"
#define PICOEV_IS_INITED (picoev.max_fd != 0)
#define PICOEV_IS_INITED_AND_FD_IN_RANGE(fd) \
(((unsigned)fd) < (unsigned)picoev.max_fd)
#define PICOEV_TOO_MANY_LOOPS (picoev.num_loops != 0) /* use after ++ */
#define PICOEV_FD_BELONGS_TO_LOOP(loop, fd) \
((loop)->loop_id == picoev.fds[fd].loop_id)
#define PICOEV_TIMEOUT_VEC_OF(loop, idx) \
((loop)->timeout.vec + (idx) * picoev.timeout_vec_size)
#define PICOEV_TIMEOUT_VEC_OF_VEC_OF(loop, idx) \
((loop)->timeout.vec_of_vec + (idx) * picoev.timeout_vec_of_vec_size)
#define PICOEV_RND_UP(v, d) (((v) + (d) - 1) / (d) * (d))
#define PICOEV_PAGE_SIZE 4096
#define PICOEV_CACHE_LINE_SIZE 32 /* in bytes, ok if greater than the actual */
#define PICOEV_SIMD_BITS 128
#define PICOEV_TIMEOUT_VEC_SIZE 128
#define PICOEV_SHORT_BITS (sizeof(short) * 8)
#define PICOEV_READ 1
#define PICOEV_WRITE 2
#define PICOEV_TIMEOUT 4
#define PICOEV_ADD 0x40000000
#define PICOEV_DEL 0x20000000
#define PICOEV_READWRITE (PICOEV_READ | PICOEV_WRITE)
#define PICOEV_TIMEOUT_IDX_UNUSED (UCHAR_MAX)
typedef unsigned short picoev_loop_id_t;
typedef struct picoev_loop_st picoev_loop;
typedef void picoev_handler(picoev_loop* loop, int fd, int revents,
void* cb_arg);
typedef struct picoev_fd_st {
/* use accessors! */
/* TODO adjust the size to match that of a cache line */
picoev_handler* callback;
void* cb_arg;
picoev_loop_id_t loop_id;
char events;
unsigned char timeout_idx; /* PICOEV_TIMEOUT_IDX_UNUSED if not used */
int _backend; /* can be used by backends (never modified by core) */
} picoev_fd;
struct picoev_loop_st {
/* read only */
picoev_loop_id_t loop_id;
struct {
short* vec;
short* vec_of_vec;
size_t base_idx;
time_t base_time;
int resolution;
void* _free_addr;
} timeout;
time_t now;
};
typedef struct picoev_globals_st {
/* read only */
picoev_fd* fds;
void* _fds_free_addr;
int max_fd;
int num_loops;
size_t timeout_vec_size; /* # of elements in picoev_loop.timeout.vec[0] */
size_t timeout_vec_of_vec_size; /* ... in timeout.vec_of_vec[0] */
} picoev_globals;
extern picoev_globals picoev;
/* creates a new event loop (defined by each backend) */
picoev_loop* picoev_create_loop(int max_timeout);
/* destroys a loop (defined by each backend) */
int picoev_destroy_loop(picoev_loop* loop);
/* internal: updates events to be watched (defined by each backend) */
int picoev_update_events_internal(picoev_loop* loop, int fd, int events);
/* internal: poll once and call the handlers (defined by each backend) */
int picoev_poll_once_internal(picoev_loop* loop, int max_wait);
/* internal, aligned allocator with address scrambling to avoid cache
line contention */
PICOEV_INLINE
void* picoev_memalign(size_t sz, void** orig_addr, int clear) {
sz = sz + PICOEV_PAGE_SIZE + PICOEV_CACHE_LINE_SIZE;
if ((*orig_addr = malloc(sz)) == NULL) {
return NULL;
}
if (clear != 0) {
memset(*orig_addr, 0, sz);
}
return
(void*)PICOEV_RND_UP((unsigned long)*orig_addr
+ (rand() % PICOEV_PAGE_SIZE),
PICOEV_CACHE_LINE_SIZE);
}
/* initializes picoev */
PICOEV_INLINE
int picoev_init(int max_fd) {
assert(! PICOEV_IS_INITED);
assert(max_fd > 0);
if ((picoev.fds = (picoev_fd*)picoev_memalign(sizeof(picoev_fd) * max_fd,
&picoev._fds_free_addr, 1))
== NULL) {
return -1;
}
picoev.max_fd = max_fd;
picoev.num_loops = 0;
picoev.timeout_vec_size
= PICOEV_RND_UP(picoev.max_fd, PICOEV_SIMD_BITS) / PICOEV_SHORT_BITS;
picoev.timeout_vec_of_vec_size
= PICOEV_RND_UP(picoev.timeout_vec_size, PICOEV_SIMD_BITS)
/ PICOEV_SHORT_BITS;
return 0;
}
/* deinitializes picoev */
PICOEV_INLINE
int picoev_deinit(void) {
assert(PICOEV_IS_INITED);
free(picoev._fds_free_addr);
picoev.fds = NULL;
picoev._fds_free_addr = NULL;
picoev.max_fd = 0;
picoev.num_loops = 0;
return 0;
}
/* updates timeout */
PICOEV_INLINE
void picoev_set_timeout(picoev_loop* loop, int fd, int secs) {
picoev_fd* target;
short* vec, * vec_of_vec;
size_t vi = fd / PICOEV_SHORT_BITS, delta;
assert(PICOEV_IS_INITED_AND_FD_IN_RANGE(fd));
assert(PICOEV_FD_BELONGS_TO_LOOP(loop, fd));
target = picoev.fds + fd;
/* clear timeout */
if (target->timeout_idx != PICOEV_TIMEOUT_IDX_UNUSED) {
vec = PICOEV_TIMEOUT_VEC_OF(loop, target->timeout_idx);
if ((vec[vi] &= ~((unsigned short)SHRT_MIN >> (fd % PICOEV_SHORT_BITS)))
== 0) {
vec_of_vec = PICOEV_TIMEOUT_VEC_OF_VEC_OF(loop, target->timeout_idx);
vec_of_vec[vi / PICOEV_SHORT_BITS]
&= ~((unsigned short)SHRT_MIN >> (vi % PICOEV_SHORT_BITS));
}
target->timeout_idx = PICOEV_TIMEOUT_IDX_UNUSED;
}
if (secs != 0) {
delta = (loop->now + secs - loop->timeout.base_time)
/ loop->timeout.resolution;
if (delta >= PICOEV_TIMEOUT_VEC_SIZE) {
delta = PICOEV_TIMEOUT_VEC_SIZE - 1;
}
target->timeout_idx =
(loop->timeout.base_idx + delta) % PICOEV_TIMEOUT_VEC_SIZE;
vec = PICOEV_TIMEOUT_VEC_OF(loop, target->timeout_idx);
vec[vi] |= (unsigned short)SHRT_MIN >> (fd % PICOEV_SHORT_BITS);
vec_of_vec = PICOEV_TIMEOUT_VEC_OF_VEC_OF(loop, target->timeout_idx);
vec_of_vec[vi / PICOEV_SHORT_BITS]
|= (unsigned short)SHRT_MIN >> (vi % PICOEV_SHORT_BITS);
}
}
/* registers a file descriptor and callback argument to a event loop */
PICOEV_INLINE
int picoev_add(picoev_loop* loop, int fd, int events, int timeout_in_secs,
picoev_handler* callback, void* cb_arg) {
picoev_fd* target;
if (unlikely(!PICOEV_IS_INITED_AND_FD_IN_RANGE(fd))) {
return -1;
}
target = picoev.fds + fd;
assert(target->loop_id == 0);
target->callback = callback;
target->cb_arg = cb_arg;
target->loop_id = loop->loop_id;
target->events = 0;
target->timeout_idx = PICOEV_TIMEOUT_IDX_UNUSED;
if ( unlikely(picoev_update_events_internal(loop, fd, events | PICOEV_ADD) != 0)) {
target->loop_id = 0;
return -1;
}
picoev_set_timeout(loop, fd, timeout_in_secs);
return 0;
}
/* unregisters a file descriptor from event loop */
PICOEV_INLINE
int picoev_del(picoev_loop* loop, int fd) {
picoev_fd* target;
assert(PICOEV_IS_INITED_AND_FD_IN_RANGE(fd));
target = picoev.fds + fd;
if (unlikely(picoev_update_events_internal(loop, fd, PICOEV_DEL) != 0)) {
return -1;
}
picoev_set_timeout(loop, fd, 0);
target->loop_id = 0;
return 0;
}
/* check if fd is registered (checks all loops if loop == NULL) */
PICOEV_INLINE
int picoev_is_active(picoev_loop* loop, int fd) {
assert(PICOEV_IS_INITED_AND_FD_IN_RANGE(fd));
return loop != NULL
? picoev.fds[fd].loop_id == loop->loop_id
: picoev.fds[fd].loop_id != 0;
}
/* returns events being watched for given descriptor */
PICOEV_INLINE
int picoev_get_events(picoev_loop* loop __attribute__((unused)), int fd) {
assert(PICOEV_IS_INITED_AND_FD_IN_RANGE(fd));
return picoev.fds[fd].events & PICOEV_READWRITE;
}
/* sets events to be watched for given desriptor */
PICOEV_INLINE
int picoev_set_events(picoev_loop* loop, int fd, int events) {
assert(PICOEV_IS_INITED_AND_FD_IN_RANGE(fd));
if (picoev.fds[fd].events != events
&& picoev_update_events_internal(loop, fd, events) != 0) {
return -1;
}
return 0;
}
/* returns callback for given descriptor */
PICOEV_INLINE
picoev_handler* picoev_get_callback(picoev_loop* loop __attribute__((unused)),
int fd, void** cb_arg) {
assert(PICOEV_IS_INITED_AND_FD_IN_RANGE(fd));
if (cb_arg != NULL) {
*cb_arg = picoev.fds[fd].cb_arg;
}
return picoev.fds[fd].callback;
}
/* sets callback for given descriptor */
PICOEV_INLINE
void picoev_set_callback(picoev_loop* loop __attribute__((unused)), int fd,
picoev_handler* callback, void** cb_arg) {
assert(PICOEV_IS_INITED_AND_FD_IN_RANGE(fd));
if (cb_arg != NULL) {
picoev.fds[fd].cb_arg = *cb_arg;
}
picoev.fds[fd].callback = callback;
}
/* function to iterate registered information. To start iteration, set curfd
to -1 and call
9104
the function until -1 is returned */
PICOEV_INLINE
int picoev_next_fd(picoev_loop* loop, int curfd) {
if (curfd != -1) {
assert(PICOEV_IS_INITED_AND_FD_IN_RANGE(curfd));
}
while (++curfd < picoev.max_fd) {
if (loop->loop_id == picoev.fds[curfd].loop_id) {
return curfd;
}
}
return -1;
}
/* internal function */
PICOEV_INLINE
int picoev_init_loop_internal(picoev_loop* loop, int max_timeout) {
loop->loop_id = ++picoev.num_loops;
assert(PICOEV_TOO_MANY_LOOPS);
if ((loop->timeout.vec_of_vec
= (short*)picoev_memalign((picoev.timeout_vec_of_vec_size
+ picoev.timeout_vec_size)
* sizeof(short) * PICOEV_TIMEOUT_VEC_SIZE,
&loop->timeout._free_addr, 1))
== NULL) {
--picoev.num_loops;
return -1;
}
loop->timeout.vec = loop->timeout.vec_of_vec
+ picoev.timeout_vec_of_vec_size * PICOEV_TIMEOUT_VEC_SIZE;
loop->timeout.base_idx = 0;
loop->timeout.base_time = current_msec/1000;
loop->timeout.resolution
= PICOEV_RND_UP(max_timeout, PICOEV_TIMEOUT_VEC_SIZE)
/ PICOEV_TIMEOUT_VEC_SIZE;
return 0;
}
/* internal function */
PICOEV_INLINE
void picoev_deinit_loop_internal(picoev_loop* loop) {
free(loop->timeout._free_addr);
}
/* internal function */
PICOEV_INLINE
void picoev_handle_timeout_internal(picoev_loop* loop) {
size_t i, j, k;
for (;
loop->timeout.base_time <= loop->now - loop->timeout.resolution;
loop->timeout.base_idx
= (loop->timeout.base_idx + 1) % PICOEV_TIMEOUT_VEC_SIZE,
loop->timeout.base_time += loop->timeout.resolution) {
/* TODO use SIMD instructions */
short* vec = PICOEV_TIMEOUT_VEC_OF(loop, loop->timeout.base_idx);
short* vec_of_vec
= PICOEV_TIMEOUT_VEC_OF_VEC_OF(loop, loop->timeout.base_idx);
for (i = 0; i < picoev.timeout_vec_of_vec_size; ++i) {
short vv = vec_of_vec[i];
if (vv != 0) {
for (j = i * PICOEV_SHORT_BITS; vv != 0; j++, vv <<= 1) {
if (vv < 0) {
short v = vec[j];
assert(v != 0);
for (k = j * PICOEV_SHORT_BITS; v != 0; k++, v <<= 1) {
if (v < 0) {
picoev_fd* fd = picoev.fds + k;
assert(fd->loop_id == loop->loop_id);
fd->timeout_idx = PICOEV_TIMEOUT_IDX_UNUSED;
(*fd->callback)(loop, k, PICOEV_TIMEOUT, fd->cb_arg);
}
}
vec[j] = 0;
}
}
vec_of_vec[i] = 0;
}
}
}
}
/* loop once */
PICOEV_INLINE
int picoev_loop_once(picoev_loop* loop, int max_wait) {
if (max_wait > loop->timeout.resolution) {
max_wait = loop->timeout.resolution;
}
if ( unlikely(picoev_poll_once_internal(loop, max_wait) != 0) ) {
return -1;
}
loop->now = current_msec / 1000;
picoev_handle_timeout_internal(loop);
return 0;
}
#undef PICOEV_INLINE
#ifdef __cplusplus
}
#endif
#endif