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7c673cae FG |
1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | ||
c07f9fc5 FG |
4 | #include "include/scope_guard.h" |
5 | ||
7c673cae | 6 | #include "common/Throttle.h" |
7c673cae FG |
7 | #include "common/perf_counters.h" |
8 | ||
31f18b77 FG |
9 | // re-include our assert to clobber the system one; fix dout: |
10 | #include "include/assert.h" | |
11 | ||
7c673cae FG |
12 | #define dout_subsys ceph_subsys_throttle |
13 | ||
14 | #undef dout_prefix | |
15 | #define dout_prefix *_dout << "throttle(" << name << " " << (void*)this << ") " | |
16 | ||
17 | enum { | |
18 | l_throttle_first = 532430, | |
19 | l_throttle_val, | |
20 | l_throttle_max, | |
21 | l_throttle_get_started, | |
22 | l_throttle_get, | |
23 | l_throttle_get_sum, | |
24 | l_throttle_get_or_fail_fail, | |
25 | l_throttle_get_or_fail_success, | |
26 | l_throttle_take, | |
27 | l_throttle_take_sum, | |
28 | l_throttle_put, | |
29 | l_throttle_put_sum, | |
30 | l_throttle_wait, | |
31 | l_throttle_last, | |
32 | }; | |
33 | ||
34 | Throttle::Throttle(CephContext *cct, const std::string& n, int64_t m, bool _use_perf) | |
35 | : cct(cct), name(n), logger(NULL), | |
36 | max(m), | |
37 | lock("Throttle::lock"), | |
38 | use_perf(_use_perf) | |
39 | { | |
40 | assert(m >= 0); | |
41 | ||
42 | if (!use_perf) | |
43 | return; | |
44 | ||
45 | if (cct->_conf->throttler_perf_counter) { | |
46 | PerfCountersBuilder b(cct, string("throttle-") + name, l_throttle_first, l_throttle_last); | |
47 | b.add_u64(l_throttle_val, "val", "Currently available throttle"); | |
48 | b.add_u64(l_throttle_max, "max", "Max value for throttle"); | |
49 | b.add_u64_counter(l_throttle_get_started, "get_started", "Number of get calls, increased before wait"); | |
50 | b.add_u64_counter(l_throttle_get, "get", "Gets"); | |
51 | b.add_u64_counter(l_throttle_get_sum, "get_sum", "Got data"); | |
52 | b.add_u64_counter(l_throttle_get_or_fail_fail, "get_or_fail_fail", "Get blocked during get_or_fail"); | |
53 | b.add_u64_counter(l_throttle_get_or_fail_success, "get_or_fail_success", "Successful get during get_or_fail"); | |
54 | b.add_u64_counter(l_throttle_take, "take", "Takes"); | |
55 | b.add_u64_counter(l_throttle_take_sum, "take_sum", "Taken data"); | |
56 | b.add_u64_counter(l_throttle_put, "put", "Puts"); | |
57 | b.add_u64_counter(l_throttle_put_sum, "put_sum", "Put data"); | |
58 | b.add_time_avg(l_throttle_wait, "wait", "Waiting latency"); | |
59 | ||
60 | logger = b.create_perf_counters(); | |
61 | cct->get_perfcounters_collection()->add(logger); | |
31f18b77 | 62 | logger->set(l_throttle_max, max); |
7c673cae FG |
63 | } |
64 | } | |
65 | ||
66 | Throttle::~Throttle() | |
67 | { | |
c07f9fc5 FG |
68 | { |
69 | Mutex::Locker l(lock); | |
70 | assert(cond.empty()); | |
7c673cae FG |
71 | } |
72 | ||
73 | if (!use_perf) | |
74 | return; | |
75 | ||
76 | if (logger) { | |
77 | cct->get_perfcounters_collection()->remove(logger); | |
78 | delete logger; | |
79 | } | |
80 | } | |
81 | ||
82 | void Throttle::_reset_max(int64_t m) | |
83 | { | |
84 | assert(lock.is_locked()); | |
31f18b77 | 85 | if (static_cast<int64_t>(max) == m) |
7c673cae FG |
86 | return; |
87 | if (!cond.empty()) | |
88 | cond.front()->SignalOne(); | |
89 | if (logger) | |
90 | logger->set(l_throttle_max, m); | |
31f18b77 | 91 | max = m; |
7c673cae FG |
92 | } |
93 | ||
94 | bool Throttle::_wait(int64_t c) | |
95 | { | |
96 | utime_t start; | |
97 | bool waited = false; | |
98 | if (_should_wait(c) || !cond.empty()) { // always wait behind other waiters. | |
c07f9fc5 FG |
99 | { |
100 | auto cv = cond.insert(cond.end(), new Cond); | |
101 | auto w = make_scope_guard([this, cv]() { | |
102 | delete *cv; | |
103 | cond.erase(cv); | |
104 | }); | |
105 | waited = true; | |
106 | ldout(cct, 2) << "_wait waiting..." << dendl; | |
107 | if (logger) | |
108 | start = ceph_clock_now(); | |
109 | ||
110 | do { | |
111 | (*cv)->Wait(lock); | |
112 | } while ((_should_wait(c) || cv != cond.begin())); | |
113 | ||
114 | ldout(cct, 2) << "_wait finished waiting" << dendl; | |
115 | if (logger) { | |
116 | utime_t dur = ceph_clock_now() - start; | |
117 | logger->tinc(l_throttle_wait, dur); | |
118 | } | |
7c673cae | 119 | } |
7c673cae FG |
120 | // wake up the next guy |
121 | if (!cond.empty()) | |
122 | cond.front()->SignalOne(); | |
123 | } | |
124 | return waited; | |
125 | } | |
126 | ||
127 | bool Throttle::wait(int64_t m) | |
128 | { | |
31f18b77 | 129 | if (0 == max && 0 == m) { |
7c673cae FG |
130 | return false; |
131 | } | |
132 | ||
133 | Mutex::Locker l(lock); | |
134 | if (m) { | |
135 | assert(m > 0); | |
136 | _reset_max(m); | |
137 | } | |
138 | ldout(cct, 10) << "wait" << dendl; | |
139 | return _wait(0); | |
140 | } | |
141 | ||
142 | int64_t Throttle::take(int64_t c) | |
143 | { | |
31f18b77 | 144 | if (0 == max) { |
7c673cae FG |
145 | return 0; |
146 | } | |
147 | assert(c >= 0); | |
148 | ldout(cct, 10) << "take " << c << dendl; | |
149 | { | |
150 | Mutex::Locker l(lock); | |
31f18b77 | 151 | count += c; |
7c673cae FG |
152 | } |
153 | if (logger) { | |
154 | logger->inc(l_throttle_take); | |
155 | logger->inc(l_throttle_take_sum, c); | |
31f18b77 | 156 | logger->set(l_throttle_val, count); |
7c673cae | 157 | } |
31f18b77 | 158 | return count; |
7c673cae FG |
159 | } |
160 | ||
161 | bool Throttle::get(int64_t c, int64_t m) | |
162 | { | |
31f18b77 | 163 | if (0 == max && 0 == m) { |
7c673cae FG |
164 | return false; |
165 | } | |
166 | ||
167 | assert(c >= 0); | |
31f18b77 | 168 | ldout(cct, 10) << "get " << c << " (" << count.load() << " -> " << (count.load() + c) << ")" << dendl; |
7c673cae FG |
169 | if (logger) { |
170 | logger->inc(l_throttle_get_started); | |
171 | } | |
172 | bool waited = false; | |
173 | { | |
174 | Mutex::Locker l(lock); | |
175 | if (m) { | |
176 | assert(m > 0); | |
177 | _reset_max(m); | |
178 | } | |
179 | waited = _wait(c); | |
31f18b77 | 180 | count += c; |
7c673cae FG |
181 | } |
182 | if (logger) { | |
183 | logger->inc(l_throttle_get); | |
184 | logger->inc(l_throttle_get_sum, c); | |
31f18b77 | 185 | logger->set(l_throttle_val, count); |
7c673cae FG |
186 | } |
187 | return waited; | |
188 | } | |
189 | ||
190 | /* Returns true if it successfully got the requested amount, | |
191 | * or false if it would block. | |
192 | */ | |
193 | bool Throttle::get_or_fail(int64_t c) | |
194 | { | |
31f18b77 | 195 | if (0 == max) { |
7c673cae FG |
196 | return true; |
197 | } | |
198 | ||
199 | assert (c >= 0); | |
200 | Mutex::Locker l(lock); | |
201 | if (_should_wait(c) || !cond.empty()) { | |
202 | ldout(cct, 10) << "get_or_fail " << c << " failed" << dendl; | |
203 | if (logger) { | |
204 | logger->inc(l_throttle_get_or_fail_fail); | |
205 | } | |
206 | return false; | |
207 | } else { | |
31f18b77 FG |
208 | ldout(cct, 10) << "get_or_fail " << c << " success (" << count.load() << " -> " << (count.load() + c) << ")" << dendl; |
209 | count += c; | |
7c673cae FG |
210 | if (logger) { |
211 | logger->inc(l_throttle_get_or_fail_success); | |
212 | logger->inc(l_throttle_get); | |
213 | logger->inc(l_throttle_get_sum, c); | |
31f18b77 | 214 | logger->set(l_throttle_val, count); |
7c673cae FG |
215 | } |
216 | return true; | |
217 | } | |
218 | } | |
219 | ||
220 | int64_t Throttle::put(int64_t c) | |
221 | { | |
31f18b77 | 222 | if (0 == max) { |
7c673cae FG |
223 | return 0; |
224 | } | |
225 | ||
226 | assert(c >= 0); | |
31f18b77 | 227 | ldout(cct, 10) << "put " << c << " (" << count.load() << " -> " << (count.load()-c) << ")" << dendl; |
7c673cae FG |
228 | Mutex::Locker l(lock); |
229 | if (c) { | |
230 | if (!cond.empty()) | |
231 | cond.front()->SignalOne(); | |
31f18b77 FG |
232 | assert(static_cast<int64_t>(count) >= c); // if count goes negative, we failed somewhere! |
233 | count -= c; | |
7c673cae FG |
234 | if (logger) { |
235 | logger->inc(l_throttle_put); | |
236 | logger->inc(l_throttle_put_sum, c); | |
31f18b77 | 237 | logger->set(l_throttle_val, count); |
7c673cae FG |
238 | } |
239 | } | |
31f18b77 | 240 | return count; |
7c673cae FG |
241 | } |
242 | ||
243 | void Throttle::reset() | |
244 | { | |
245 | Mutex::Locker l(lock); | |
246 | if (!cond.empty()) | |
247 | cond.front()->SignalOne(); | |
31f18b77 | 248 | count = 0; |
7c673cae FG |
249 | if (logger) { |
250 | logger->set(l_throttle_val, 0); | |
251 | } | |
252 | } | |
253 | ||
254 | enum { | |
255 | l_backoff_throttle_first = l_throttle_last + 1, | |
256 | l_backoff_throttle_val, | |
257 | l_backoff_throttle_max, | |
258 | l_backoff_throttle_get, | |
259 | l_backoff_throttle_get_sum, | |
260 | l_backoff_throttle_take, | |
261 | l_backoff_throttle_take_sum, | |
262 | l_backoff_throttle_put, | |
263 | l_backoff_throttle_put_sum, | |
264 | l_backoff_throttle_wait, | |
265 | l_backoff_throttle_last, | |
266 | }; | |
267 | ||
268 | BackoffThrottle::BackoffThrottle(CephContext *cct, const std::string& n, unsigned expected_concurrency, bool _use_perf) | |
269 | : cct(cct), name(n), logger(NULL), | |
270 | conds(expected_concurrency),///< [in] determines size of conds | |
271 | use_perf(_use_perf) | |
272 | { | |
273 | if (!use_perf) | |
274 | return; | |
275 | ||
276 | if (cct->_conf->throttler_perf_counter) { | |
277 | PerfCountersBuilder b(cct, string("throttle-") + name, l_backoff_throttle_first, l_backoff_throttle_last); | |
278 | b.add_u64(l_backoff_throttle_val, "val", "Currently available throttle"); | |
279 | b.add_u64(l_backoff_throttle_max, "max", "Max value for throttle"); | |
280 | b.add_u64_counter(l_backoff_throttle_get, "get", "Gets"); | |
281 | b.add_u64_counter(l_backoff_throttle_get_sum, "get_sum", "Got data"); | |
282 | b.add_u64_counter(l_backoff_throttle_take, "take", "Takes"); | |
283 | b.add_u64_counter(l_backoff_throttle_take_sum, "take_sum", "Taken data"); | |
284 | b.add_u64_counter(l_backoff_throttle_put, "put", "Puts"); | |
285 | b.add_u64_counter(l_backoff_throttle_put_sum, "put_sum", "Put data"); | |
286 | b.add_time_avg(l_backoff_throttle_wait, "wait", "Waiting latency"); | |
287 | ||
288 | logger = b.create_perf_counters(); | |
289 | cct->get_perfcounters_collection()->add(logger); | |
290 | logger->set(l_backoff_throttle_max, max); | |
291 | } | |
292 | } | |
293 | ||
294 | BackoffThrottle::~BackoffThrottle() | |
295 | { | |
c07f9fc5 FG |
296 | { |
297 | locker l(lock); | |
298 | assert(waiters.empty()); | |
299 | } | |
300 | ||
7c673cae FG |
301 | if (!use_perf) |
302 | return; | |
303 | ||
304 | if (logger) { | |
305 | cct->get_perfcounters_collection()->remove(logger); | |
306 | delete logger; | |
307 | } | |
308 | } | |
309 | ||
310 | bool BackoffThrottle::set_params( | |
311 | double _low_threshhold, | |
312 | double _high_threshhold, | |
313 | double _expected_throughput, | |
314 | double _high_multiple, | |
315 | double _max_multiple, | |
316 | uint64_t _throttle_max, | |
317 | ostream *errstream) | |
318 | { | |
319 | bool valid = true; | |
320 | if (_low_threshhold > _high_threshhold) { | |
321 | valid = false; | |
322 | if (errstream) { | |
323 | *errstream << "low_threshhold (" << _low_threshhold | |
324 | << ") > high_threshhold (" << _high_threshhold | |
325 | << ")" << std::endl; | |
326 | } | |
327 | } | |
328 | ||
329 | if (_high_multiple > _max_multiple) { | |
330 | valid = false; | |
331 | if (errstream) { | |
332 | *errstream << "_high_multiple (" << _high_multiple | |
333 | << ") > _max_multiple (" << _max_multiple | |
334 | << ")" << std::endl; | |
335 | } | |
336 | } | |
337 | ||
338 | if (_low_threshhold > 1 || _low_threshhold < 0) { | |
339 | valid = false; | |
340 | if (errstream) { | |
341 | *errstream << "invalid low_threshhold (" << _low_threshhold << ")" | |
342 | << std::endl; | |
343 | } | |
344 | } | |
345 | ||
346 | if (_high_threshhold > 1 || _high_threshhold < 0) { | |
347 | valid = false; | |
348 | if (errstream) { | |
349 | *errstream << "invalid high_threshhold (" << _high_threshhold << ")" | |
350 | << std::endl; | |
351 | } | |
352 | } | |
353 | ||
354 | if (_max_multiple < 0) { | |
355 | valid = false; | |
356 | if (errstream) { | |
357 | *errstream << "invalid _max_multiple (" | |
358 | << _max_multiple << ")" | |
359 | << std::endl; | |
360 | } | |
361 | } | |
362 | ||
363 | if (_high_multiple < 0) { | |
364 | valid = false; | |
365 | if (errstream) { | |
366 | *errstream << "invalid _high_multiple (" | |
367 | << _high_multiple << ")" | |
368 | << std::endl; | |
369 | } | |
370 | } | |
371 | ||
372 | if (_expected_throughput < 0) { | |
373 | valid = false; | |
374 | if (errstream) { | |
375 | *errstream << "invalid _expected_throughput(" | |
376 | << _expected_throughput << ")" | |
377 | << std::endl; | |
378 | } | |
379 | } | |
380 | ||
381 | if (!valid) | |
382 | return false; | |
383 | ||
384 | locker l(lock); | |
385 | low_threshhold = _low_threshhold; | |
386 | high_threshhold = _high_threshhold; | |
387 | high_delay_per_count = _high_multiple / _expected_throughput; | |
388 | max_delay_per_count = _max_multiple / _expected_throughput; | |
389 | max = _throttle_max; | |
390 | ||
391 | if (logger) | |
392 | logger->set(l_backoff_throttle_max, max); | |
393 | ||
394 | if (high_threshhold - low_threshhold > 0) { | |
395 | s0 = high_delay_per_count / (high_threshhold - low_threshhold); | |
396 | } else { | |
397 | low_threshhold = high_threshhold; | |
398 | s0 = 0; | |
399 | } | |
400 | ||
401 | if (1 - high_threshhold > 0) { | |
402 | s1 = (max_delay_per_count - high_delay_per_count) | |
403 | / (1 - high_threshhold); | |
404 | } else { | |
405 | high_threshhold = 1; | |
406 | s1 = 0; | |
407 | } | |
408 | ||
409 | _kick_waiters(); | |
410 | return true; | |
411 | } | |
412 | ||
413 | std::chrono::duration<double> BackoffThrottle::_get_delay(uint64_t c) const | |
414 | { | |
415 | if (max == 0) | |
416 | return std::chrono::duration<double>(0); | |
417 | ||
418 | double r = ((double)current) / ((double)max); | |
419 | if (r < low_threshhold) { | |
420 | return std::chrono::duration<double>(0); | |
421 | } else if (r < high_threshhold) { | |
422 | return c * std::chrono::duration<double>( | |
423 | (r - low_threshhold) * s0); | |
424 | } else { | |
425 | return c * std::chrono::duration<double>( | |
426 | high_delay_per_count + ((r - high_threshhold) * s1)); | |
427 | } | |
428 | } | |
429 | ||
430 | std::chrono::duration<double> BackoffThrottle::get(uint64_t c) | |
431 | { | |
432 | locker l(lock); | |
433 | auto delay = _get_delay(c); | |
434 | ||
435 | if (logger) { | |
436 | logger->inc(l_backoff_throttle_get); | |
437 | logger->inc(l_backoff_throttle_get_sum, c); | |
438 | } | |
439 | ||
440 | // fast path | |
441 | if (delay == std::chrono::duration<double>(0) && | |
442 | waiters.empty() && | |
443 | ((max == 0) || (current == 0) || ((current + c) <= max))) { | |
444 | current += c; | |
445 | ||
446 | if (logger) { | |
447 | logger->set(l_backoff_throttle_val, current); | |
448 | } | |
449 | ||
450 | return std::chrono::duration<double>(0); | |
451 | } | |
452 | ||
453 | auto ticket = _push_waiter(); | |
454 | utime_t wait_from = ceph_clock_now(); | |
455 | bool waited = false; | |
456 | ||
457 | while (waiters.begin() != ticket) { | |
458 | (*ticket)->wait(l); | |
459 | waited = true; | |
460 | } | |
461 | ||
462 | auto start = std::chrono::system_clock::now(); | |
463 | delay = _get_delay(c); | |
464 | while (true) { | |
465 | if (!((max == 0) || (current == 0) || (current + c) <= max)) { | |
466 | (*ticket)->wait(l); | |
467 | waited = true; | |
468 | } else if (delay > std::chrono::duration<double>(0)) { | |
469 | (*ticket)->wait_for(l, delay); | |
470 | waited = true; | |
471 | } else { | |
472 | break; | |
473 | } | |
474 | assert(ticket == waiters.begin()); | |
475 | delay = _get_delay(c) - (std::chrono::system_clock::now() - start); | |
476 | } | |
477 | waiters.pop_front(); | |
478 | _kick_waiters(); | |
479 | ||
480 | current += c; | |
481 | ||
482 | if (logger) { | |
483 | logger->set(l_backoff_throttle_val, current); | |
484 | if (waited) { | |
485 | logger->tinc(l_backoff_throttle_wait, ceph_clock_now() - wait_from); | |
486 | } | |
487 | } | |
488 | ||
489 | return std::chrono::system_clock::now() - start; | |
490 | } | |
491 | ||
492 | uint64_t BackoffThrottle::put(uint64_t c) | |
493 | { | |
494 | locker l(lock); | |
495 | assert(current >= c); | |
496 | current -= c; | |
497 | _kick_waiters(); | |
498 | ||
499 | if (logger) { | |
500 | logger->inc(l_backoff_throttle_put); | |
501 | logger->inc(l_backoff_throttle_put_sum, c); | |
502 | logger->set(l_backoff_throttle_val, current); | |
503 | } | |
504 | ||
505 | return current; | |
506 | } | |
507 | ||
508 | uint64_t BackoffThrottle::take(uint64_t c) | |
509 | { | |
510 | locker l(lock); | |
511 | current += c; | |
512 | ||
513 | if (logger) { | |
514 | logger->inc(l_backoff_throttle_take); | |
515 | logger->inc(l_backoff_throttle_take_sum, c); | |
516 | logger->set(l_backoff_throttle_val, current); | |
517 | } | |
518 | ||
519 | return current; | |
520 | } | |
521 | ||
522 | uint64_t BackoffThrottle::get_current() | |
523 | { | |
524 | locker l(lock); | |
525 | return current; | |
526 | } | |
527 | ||
528 | uint64_t BackoffThrottle::get_max() | |
529 | { | |
530 | locker l(lock); | |
531 | return max; | |
532 | } | |
533 | ||
534 | SimpleThrottle::SimpleThrottle(uint64_t max, bool ignore_enoent) | |
535 | : m_lock("SimpleThrottle"), | |
536 | m_max(max), | |
537 | m_current(0), | |
538 | m_ret(0), | |
539 | m_ignore_enoent(ignore_enoent) | |
540 | { | |
541 | } | |
542 | ||
543 | SimpleThrottle::~SimpleThrottle() | |
544 | { | |
545 | Mutex::Locker l(m_lock); | |
546 | assert(m_current == 0); | |
c07f9fc5 | 547 | assert(waiters == 0); |
7c673cae FG |
548 | } |
549 | ||
550 | void SimpleThrottle::start_op() | |
551 | { | |
552 | Mutex::Locker l(m_lock); | |
c07f9fc5 FG |
553 | while (m_max == m_current) { |
554 | waiters++; | |
7c673cae | 555 | m_cond.Wait(m_lock); |
c07f9fc5 FG |
556 | waiters--; |
557 | } | |
7c673cae FG |
558 | ++m_current; |
559 | } | |
560 | ||
561 | void SimpleThrottle::end_op(int r) | |
562 | { | |
563 | Mutex::Locker l(m_lock); | |
564 | --m_current; | |
565 | if (r < 0 && !m_ret && !(r == -ENOENT && m_ignore_enoent)) | |
566 | m_ret = r; | |
567 | m_cond.Signal(); | |
568 | } | |
569 | ||
570 | bool SimpleThrottle::pending_error() const | |
571 | { | |
572 | Mutex::Locker l(m_lock); | |
573 | return (m_ret < 0); | |
574 | } | |
575 | ||
576 | int SimpleThrottle::wait_for_ret() | |
577 | { | |
578 | Mutex::Locker l(m_lock); | |
c07f9fc5 FG |
579 | while (m_current > 0) { |
580 | waiters++; | |
7c673cae | 581 | m_cond.Wait(m_lock); |
c07f9fc5 FG |
582 | waiters--; |
583 | } | |
7c673cae FG |
584 | return m_ret; |
585 | } | |
586 | ||
587 | void C_OrderedThrottle::finish(int r) { | |
588 | m_ordered_throttle->finish_op(m_tid, r); | |
589 | } | |
590 | ||
591 | OrderedThrottle::OrderedThrottle(uint64_t max, bool ignore_enoent) | |
592 | : m_lock("OrderedThrottle::m_lock"), m_max(max), m_current(0), m_ret_val(0), | |
593 | m_ignore_enoent(ignore_enoent), m_next_tid(0), m_complete_tid(0) { | |
594 | } | |
595 | ||
c07f9fc5 FG |
596 | OrderedThrottle::~OrderedThrottle() { |
597 | Mutex::Locker locker(m_lock); | |
598 | assert(waiters == 0); | |
599 | } | |
600 | ||
7c673cae FG |
601 | C_OrderedThrottle *OrderedThrottle::start_op(Context *on_finish) { |
602 | assert(on_finish != NULL); | |
603 | ||
604 | Mutex::Locker locker(m_lock); | |
605 | uint64_t tid = m_next_tid++; | |
606 | m_tid_result[tid] = Result(on_finish); | |
607 | C_OrderedThrottle *ctx = new C_OrderedThrottle(this, tid); | |
608 | ||
609 | complete_pending_ops(); | |
610 | while (m_max == m_current) { | |
c07f9fc5 | 611 | ++waiters; |
7c673cae | 612 | m_cond.Wait(m_lock); |
c07f9fc5 | 613 | --waiters; |
7c673cae FG |
614 | complete_pending_ops(); |
615 | } | |
616 | ++m_current; | |
617 | ||
618 | return ctx; | |
619 | } | |
620 | ||
621 | void OrderedThrottle::end_op(int r) { | |
622 | Mutex::Locker locker(m_lock); | |
623 | assert(m_current > 0); | |
624 | ||
625 | if (r < 0 && m_ret_val == 0 && (r != -ENOENT || !m_ignore_enoent)) { | |
626 | m_ret_val = r; | |
627 | } | |
628 | --m_current; | |
629 | m_cond.Signal(); | |
630 | } | |
631 | ||
632 | void OrderedThrottle::finish_op(uint64_t tid, int r) { | |
633 | Mutex::Locker locker(m_lock); | |
634 | ||
635 | TidResult::iterator it = m_tid_result.find(tid); | |
636 | assert(it != m_tid_result.end()); | |
637 | ||
638 | it->second.finished = true; | |
639 | it->second.ret_val = r; | |
640 | m_cond.Signal(); | |
641 | } | |
642 | ||
643 | bool OrderedThrottle::pending_error() const { | |
644 | Mutex::Locker locker(m_lock); | |
645 | return (m_ret_val < 0); | |
646 | } | |
647 | ||
648 | int OrderedThrottle::wait_for_ret() { | |
649 | Mutex::Locker locker(m_lock); | |
650 | complete_pending_ops(); | |
651 | ||
652 | while (m_current > 0) { | |
c07f9fc5 | 653 | ++waiters; |
7c673cae | 654 | m_cond.Wait(m_lock); |
c07f9fc5 | 655 | --waiters; |
7c673cae FG |
656 | complete_pending_ops(); |
657 | } | |
658 | return m_ret_val; | |
659 | } | |
660 | ||
661 | void OrderedThrottle::complete_pending_ops() { | |
662 | assert(m_lock.is_locked()); | |
663 | ||
664 | while (true) { | |
665 | TidResult::iterator it = m_tid_result.begin(); | |
666 | if (it == m_tid_result.end() || it->first != m_complete_tid || | |
667 | !it->second.finished) { | |
668 | break; | |
669 | } | |
670 | ||
671 | Result result = it->second; | |
672 | m_tid_result.erase(it); | |
673 | ||
674 | m_lock.Unlock(); | |
675 | result.on_finish->complete(result.ret_val); | |
676 | m_lock.Lock(); | |
677 | ||
678 | ++m_complete_tid; | |
679 | } | |
680 | } |