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cd748f27 | 1 | /* |
40173038 | 2 | * $Id: aiops.cc,v 1.16 2002/10/22 07:02:00 hno Exp $ |
cd748f27 | 3 | * |
4 | * DEBUG: section 43 AIOPS | |
5 | * AUTHOR: Stewart Forster <slf@connect.com.au> | |
6 | * | |
2b6662ba | 7 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
cd748f27 | 8 | * ---------------------------------------------------------- |
9 | * | |
2b6662ba | 10 | * Squid is the result of efforts by numerous individuals from |
11 | * the Internet community; see the CONTRIBUTORS file for full | |
12 | * details. Many organizations have provided support for Squid's | |
13 | * development; see the SPONSORS file for full details. Squid is | |
14 | * Copyrighted (C) 2001 by the Regents of the University of | |
15 | * California; see the COPYRIGHT file for full details. Squid | |
16 | * incorporates software developed and/or copyrighted by other | |
17 | * sources; see the CREDITS file for full details. | |
cd748f27 | 18 | * |
19 | * This program is free software; you can redistribute it and/or modify | |
20 | * it under the terms of the GNU General Public License as published by | |
21 | * the Free Software Foundation; either version 2 of the License, or | |
22 | * (at your option) any later version. | |
23 | * | |
24 | * This program is distributed in the hope that it will be useful, | |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * along with this program; if not, write to the Free Software | |
31 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
32 | * | |
33 | */ | |
34 | ||
35 | #include "squid.h" | |
36 | #include "store_asyncufs.h" | |
37 | ||
38 | #include <stdio.h> | |
39 | #include <sys/types.h> | |
40 | #include <sys/stat.h> | |
41 | #include <fcntl.h> | |
42 | #include <pthread.h> | |
43 | #include <errno.h> | |
44 | #include <dirent.h> | |
45 | #include <signal.h> | |
46 | #if HAVE_SCHED_H | |
47 | #include <sched.h> | |
48 | #endif | |
49 | ||
50 | #define RIDICULOUS_LENGTH 4096 | |
51 | ||
c04d4f40 | 52 | enum _squidaio_thread_status { |
cd748f27 | 53 | _THREAD_STARTING = 0, |
54 | _THREAD_WAITING, | |
55 | _THREAD_BUSY, | |
56 | _THREAD_FAILED, | |
57 | _THREAD_DONE | |
58 | }; | |
c04d4f40 | 59 | typedef enum _squidaio_thread_status squidaio_thread_status; |
cd748f27 | 60 | |
c04d4f40 | 61 | typedef struct squidaio_request_t { |
62 | struct squidaio_request_t *next; | |
63 | squidaio_request_type request_type; | |
cd748f27 | 64 | int cancelled; |
65 | char *path; | |
66 | int oflag; | |
67 | mode_t mode; | |
68 | int fd; | |
69 | char *bufferp; | |
70 | char *tmpbufp; | |
71 | int buflen; | |
72 | off_t offset; | |
73 | int whence; | |
74 | int ret; | |
75 | int err; | |
76 | struct stat *tmpstatp; | |
77 | struct stat *statp; | |
c04d4f40 | 78 | squidaio_result_t *resultp; |
79 | } squidaio_request_t; | |
cd748f27 | 80 | |
c04d4f40 | 81 | typedef struct squidaio_request_queue_t { |
55f0e6f7 | 82 | pthread_mutex_t mutex; |
83 | pthread_cond_t cond; | |
c04d4f40 | 84 | squidaio_request_t *volatile head; |
85 | squidaio_request_t *volatile *volatile tailp; | |
55f0e6f7 | 86 | unsigned long requests; |
f0debecb | 87 | unsigned long blocked; /* main failed to lock the queue */ |
c04d4f40 | 88 | } squidaio_request_queue_t; |
55f0e6f7 | 89 | |
c04d4f40 | 90 | typedef struct squidaio_thread_t squidaio_thread_t; |
91 | struct squidaio_thread_t { | |
92 | squidaio_thread_t *next; | |
cd748f27 | 93 | pthread_t thread; |
c04d4f40 | 94 | squidaio_thread_status status; |
95 | struct squidaio_request_t *current_req; | |
55f0e6f7 | 96 | unsigned long requests; |
97 | }; | |
cd748f27 | 98 | |
c04d4f40 | 99 | static void squidaio_init(void); |
100 | static void squidaio_queue_request(squidaio_request_t *); | |
101 | static void squidaio_cleanup_request(squidaio_request_t *); | |
102 | static void *squidaio_thread_loop(void *); | |
103 | static void squidaio_do_open(squidaio_request_t *); | |
104 | static void squidaio_do_read(squidaio_request_t *); | |
105 | static void squidaio_do_write(squidaio_request_t *); | |
106 | static void squidaio_do_close(squidaio_request_t *); | |
107 | static void squidaio_do_stat(squidaio_request_t *); | |
108 | static void squidaio_do_unlink(squidaio_request_t *); | |
109 | static void squidaio_do_truncate(squidaio_request_t *); | |
cd748f27 | 110 | #if AIO_OPENDIR |
c04d4f40 | 111 | static void *squidaio_do_opendir(squidaio_request_t *); |
cd748f27 | 112 | #endif |
c04d4f40 | 113 | static void squidaio_debug(squidaio_request_t *); |
114 | static void squidaio_poll_queues(void); | |
cd748f27 | 115 | |
c04d4f40 | 116 | static squidaio_thread_t *threads = NULL; |
117 | static int squidaio_initialised = 0; | |
cd748f27 | 118 | |
55f0e6f7 | 119 | |
58cd5bbd | 120 | #define AIO_LARGE_BUFS 16384 |
121 | #define AIO_MEDIUM_BUFS AIO_LARGE_BUFS >> 1 | |
122 | #define AIO_SMALL_BUFS AIO_LARGE_BUFS >> 2 | |
123 | #define AIO_TINY_BUFS AIO_LARGE_BUFS >> 3 | |
55f0e6f7 | 124 | #define AIO_MICRO_BUFS 128 |
58cd5bbd | 125 | |
c04d4f40 | 126 | static MemPool *squidaio_large_bufs = NULL; /* 16K */ |
9bea1d5b | 127 | static MemPool *squidaio_medium_bufs = NULL; /* 8K */ |
c04d4f40 | 128 | static MemPool *squidaio_small_bufs = NULL; /* 4K */ |
129 | static MemPool *squidaio_tiny_bufs = NULL; /* 2K */ | |
130 | static MemPool *squidaio_micro_bufs = NULL; /* 128K */ | |
58cd5bbd | 131 | |
cd748f27 | 132 | static int request_queue_len = 0; |
c04d4f40 | 133 | static MemPool *squidaio_request_pool = NULL; |
134 | static MemPool *squidaio_thread_pool = NULL; | |
135 | static squidaio_request_queue_t request_queue; | |
f0debecb | 136 | static struct { |
c04d4f40 | 137 | squidaio_request_t *head, **tailp; |
f0debecb | 138 | } request_queue2 = { |
139 | ||
140 | NULL, &request_queue2.head | |
141 | }; | |
c04d4f40 | 142 | static squidaio_request_queue_t done_queue; |
f0debecb | 143 | static struct { |
c04d4f40 | 144 | squidaio_request_t *head, **tailp; |
f0debecb | 145 | } done_requests = { |
146 | ||
147 | NULL, &done_requests.head | |
148 | }; | |
cd748f27 | 149 | static pthread_attr_t globattr; |
5e5c622b | 150 | #if HAVE_SCHED_H |
cd748f27 | 151 | static struct sched_param globsched; |
5e5c622b | 152 | #endif |
cd748f27 | 153 | static pthread_t main_thread; |
154 | ||
58cd5bbd | 155 | static MemPool * |
c04d4f40 | 156 | squidaio_get_pool(int size) |
58cd5bbd | 157 | { |
158 | MemPool *p; | |
159 | if (size <= AIO_LARGE_BUFS) { | |
f0debecb | 160 | if (size <= AIO_MICRO_BUFS) |
c04d4f40 | 161 | p = squidaio_micro_bufs; |
55f0e6f7 | 162 | else if (size <= AIO_TINY_BUFS) |
c04d4f40 | 163 | p = squidaio_tiny_bufs; |
f0debecb | 164 | else if (size <= AIO_SMALL_BUFS) |
c04d4f40 | 165 | p = squidaio_small_bufs; |
f0debecb | 166 | else if (size <= AIO_MEDIUM_BUFS) |
c04d4f40 | 167 | p = squidaio_medium_bufs; |
f0debecb | 168 | else |
c04d4f40 | 169 | p = squidaio_large_bufs; |
58cd5bbd | 170 | } else |
171 | p = NULL; | |
172 | return p; | |
173 | } | |
174 | ||
175 | static void * | |
c04d4f40 | 176 | squidaio_xmalloc(int size) |
58cd5bbd | 177 | { |
178 | void *p; | |
179 | MemPool *pool; | |
180 | ||
c04d4f40 | 181 | if ((pool = squidaio_get_pool(size)) != NULL) { |
58cd5bbd | 182 | p = memPoolAlloc(pool); |
183 | } else | |
184 | p = xmalloc(size); | |
185 | ||
186 | return p; | |
187 | } | |
188 | ||
55f0e6f7 | 189 | static char * |
c04d4f40 | 190 | squidaio_xstrdup(const char *str) |
55f0e6f7 | 191 | { |
192 | char *p; | |
f0debecb | 193 | int len = strlen(str) + 1; |
55f0e6f7 | 194 | |
e6ccf245 | 195 | p = (char *)squidaio_xmalloc(len); |
55f0e6f7 | 196 | strncpy(p, str, len); |
197 | ||
198 | return p; | |
199 | } | |
200 | ||
58cd5bbd | 201 | static void |
c04d4f40 | 202 | squidaio_xfree(void *p, int size) |
58cd5bbd | 203 | { |
204 | MemPool *pool; | |
205 | ||
c04d4f40 | 206 | if ((pool = squidaio_get_pool(size)) != NULL) { |
f0debecb | 207 | memPoolFree(pool, p); |
58cd5bbd | 208 | } else |
f0debecb | 209 | xfree(p); |
58cd5bbd | 210 | } |
211 | ||
55f0e6f7 | 212 | static void |
c04d4f40 | 213 | squidaio_xstrfree(char *str) |
55f0e6f7 | 214 | { |
215 | MemPool *pool; | |
f0debecb | 216 | int len = strlen(str) + 1; |
55f0e6f7 | 217 | |
c04d4f40 | 218 | if ((pool = squidaio_get_pool(len)) != NULL) { |
f0debecb | 219 | memPoolFree(pool, str); |
55f0e6f7 | 220 | } else |
f0debecb | 221 | xfree(str); |
55f0e6f7 | 222 | } |
223 | ||
cd748f27 | 224 | static void |
c04d4f40 | 225 | squidaio_init(void) |
cd748f27 | 226 | { |
227 | int i; | |
c04d4f40 | 228 | squidaio_thread_t *threadp; |
cd748f27 | 229 | |
c04d4f40 | 230 | if (squidaio_initialised) |
cd748f27 | 231 | return; |
232 | ||
233 | pthread_attr_init(&globattr); | |
234 | #if HAVE_PTHREAD_ATTR_SETSCOPE | |
235 | pthread_attr_setscope(&globattr, PTHREAD_SCOPE_SYSTEM); | |
236 | #endif | |
5e5c622b | 237 | #if HAVE_SCHED_H |
cd748f27 | 238 | globsched.sched_priority = 1; |
5e5c622b | 239 | #endif |
cd748f27 | 240 | main_thread = pthread_self(); |
5e5c622b | 241 | #if HAVE_SCHED_H && HAVE_PTHREAD_SETSCHEDPARAM |
cd748f27 | 242 | pthread_setschedparam(main_thread, SCHED_OTHER, &globsched); |
243 | #endif | |
5e5c622b | 244 | #if HAVE_SCHED_H |
cd748f27 | 245 | globsched.sched_priority = 2; |
5e5c622b | 246 | #endif |
247 | #if HAVE_SCHED_H && HAVE_PTHREAD_ATTR_SETSCHEDPARAM | |
cd748f27 | 248 | pthread_attr_setschedparam(&globattr, &globsched); |
249 | #endif | |
250 | ||
55f0e6f7 | 251 | /* Initialize request queue */ |
252 | if (pthread_mutex_init(&(request_queue.mutex), NULL)) | |
253 | fatal("Failed to create mutex"); | |
254 | if (pthread_cond_init(&(request_queue.cond), NULL)) | |
255 | fatal("Failed to create condition variable"); | |
256 | request_queue.head = NULL; | |
257 | request_queue.tailp = &request_queue.head; | |
258 | request_queue.requests = 0; | |
259 | request_queue.blocked = 0; | |
260 | ||
261 | /* Initialize done queue */ | |
262 | if (pthread_mutex_init(&(done_queue.mutex), NULL)) | |
263 | fatal("Failed to create mutex"); | |
264 | if (pthread_cond_init(&(done_queue.cond), NULL)) | |
265 | fatal("Failed to create condition variable"); | |
266 | done_queue.head = NULL; | |
267 | done_queue.tailp = &done_queue.head; | |
268 | done_queue.requests = 0; | |
269 | done_queue.blocked = 0; | |
cd748f27 | 270 | |
55f0e6f7 | 271 | /* Create threads and get them to sit in their wait loop */ |
c04d4f40 | 272 | squidaio_thread_pool = memPoolCreate("aio_thread", sizeof(squidaio_thread_t)); |
12e137b0 | 273 | assert (NUMTHREADS); |
cd748f27 | 274 | for (i = 0; i < NUMTHREADS; i++) { |
e6ccf245 | 275 | threadp = (squidaio_thread_t *)memPoolAlloc(squidaio_thread_pool); |
cd748f27 | 276 | threadp->status = _THREAD_STARTING; |
55f0e6f7 | 277 | threadp->current_req = NULL; |
278 | threadp->requests = 0; | |
279 | threadp->next = threads; | |
280 | threads = threadp; | |
c04d4f40 | 281 | if (pthread_create(&threadp->thread, &globattr, squidaio_thread_loop, threadp)) { |
cd748f27 | 282 | fprintf(stderr, "Thread creation failed\n"); |
283 | threadp->status = _THREAD_FAILED; | |
284 | continue; | |
285 | } | |
cd748f27 | 286 | } |
287 | ||
288 | /* Create request pool */ | |
c04d4f40 | 289 | squidaio_request_pool = memPoolCreate("aio_request", sizeof(squidaio_request_t)); |
290 | squidaio_large_bufs = memPoolCreate("squidaio_large_bufs", AIO_LARGE_BUFS); | |
291 | squidaio_medium_bufs = memPoolCreate("squidaio_medium_bufs", AIO_MEDIUM_BUFS); | |
292 | squidaio_small_bufs = memPoolCreate("squidaio_small_bufs", AIO_SMALL_BUFS); | |
293 | squidaio_tiny_bufs = memPoolCreate("squidaio_tiny_bufs", AIO_TINY_BUFS); | |
294 | squidaio_micro_bufs = memPoolCreate("squidaio_micro_bufs", AIO_MICRO_BUFS); | |
295 | ||
296 | squidaio_initialised = 1; | |
cd748f27 | 297 | } |
298 | ||
299 | ||
300 | static void * | |
c04d4f40 | 301 | squidaio_thread_loop(void *ptr) |
cd748f27 | 302 | { |
e6ccf245 | 303 | squidaio_thread_t *threadp = (squidaio_thread_t *)ptr; |
c04d4f40 | 304 | squidaio_request_t *request; |
e6ccf245 | 305 | sigset_t newSig; |
cd748f27 | 306 | |
307 | /* | |
308 | * Make sure to ignore signals which may possibly get sent to | |
309 | * the parent squid thread. Causes havoc with mutex's and | |
310 | * condition waits otherwise | |
311 | */ | |
312 | ||
e6ccf245 | 313 | sigemptyset(&newSig); |
314 | sigaddset(&newSig, SIGPIPE); | |
315 | sigaddset(&newSig, SIGCHLD); | |
cd748f27 | 316 | #ifdef _SQUID_LINUX_THREADS_ |
e6ccf245 | 317 | sigaddset(&newSig, SIGQUIT); |
318 | sigaddset(&newSig, SIGTRAP); | |
cd748f27 | 319 | #else |
e6ccf245 | 320 | sigaddset(&newSig, SIGUSR1); |
321 | sigaddset(&newSig, SIGUSR2); | |
cd748f27 | 322 | #endif |
e6ccf245 | 323 | sigaddset(&newSig, SIGHUP); |
324 | sigaddset(&newSig, SIGTERM); | |
325 | sigaddset(&newSig, SIGINT); | |
326 | sigaddset(&newSig, SIGALRM); | |
327 | pthread_sigmask(SIG_BLOCK, &newSig, NULL); | |
cd748f27 | 328 | |
cd748f27 | 329 | while (1) { |
55f0e6f7 | 330 | threadp->current_req = request = NULL; |
331 | request = NULL; | |
332 | /* Get a request to process */ | |
f0debecb | 333 | threadp->status = _THREAD_WAITING; |
55f0e6f7 | 334 | pthread_mutex_lock(&request_queue.mutex); |
f0debecb | 335 | while (!request_queue.head) { |
55f0e6f7 | 336 | pthread_cond_wait(&request_queue.cond, &request_queue.mutex); |
cd748f27 | 337 | } |
55f0e6f7 | 338 | request = request_queue.head; |
339 | if (request) | |
340 | request_queue.head = request->next; | |
f0debecb | 341 | if (!request_queue.head) |
342 | request_queue.tailp = &request_queue.head; | |
55f0e6f7 | 343 | pthread_mutex_unlock(&request_queue.mutex); |
344 | /* process the request */ | |
345 | threadp->status = _THREAD_BUSY; | |
346 | request->next = NULL; | |
347 | threadp->current_req = request; | |
cd748f27 | 348 | errno = 0; |
349 | if (!request->cancelled) { | |
350 | switch (request->request_type) { | |
351 | case _AIO_OP_OPEN: | |
c04d4f40 | 352 | squidaio_do_open(request); |
cd748f27 | 353 | break; |
354 | case _AIO_OP_READ: | |
c04d4f40 | 355 | squidaio_do_read(request); |
cd748f27 | 356 | break; |
357 | case _AIO_OP_WRITE: | |
c04d4f40 | 358 | squidaio_do_write(request); |
cd748f27 | 359 | break; |
360 | case _AIO_OP_CLOSE: | |
c04d4f40 | 361 | squidaio_do_close(request); |
cd748f27 | 362 | break; |
363 | case _AIO_OP_UNLINK: | |
c04d4f40 | 364 | squidaio_do_unlink(request); |
cd748f27 | 365 | break; |
15a47d1d | 366 | case _AIO_OP_TRUNCATE: |
c04d4f40 | 367 | squidaio_do_truncate(request); |
15a47d1d | 368 | break; |
cd748f27 | 369 | #if AIO_OPENDIR /* Opendir not implemented yet */ |
370 | case _AIO_OP_OPENDIR: | |
c04d4f40 | 371 | squidaio_do_opendir(request); |
cd748f27 | 372 | break; |
373 | #endif | |
374 | case _AIO_OP_STAT: | |
c04d4f40 | 375 | squidaio_do_stat(request); |
cd748f27 | 376 | break; |
377 | default: | |
378 | request->ret = -1; | |
379 | request->err = EINVAL; | |
380 | break; | |
381 | } | |
382 | } else { /* cancelled */ | |
383 | request->ret = -1; | |
384 | request->err = EINTR; | |
385 | } | |
55f0e6f7 | 386 | threadp->status = _THREAD_DONE; |
387 | /* put the request in the done queue */ | |
388 | pthread_mutex_lock(&done_queue.mutex); | |
389 | *done_queue.tailp = request; | |
390 | done_queue.tailp = &request->next; | |
391 | pthread_mutex_unlock(&done_queue.mutex); | |
392 | threadp->requests++; | |
393 | } /* while forever */ | |
cd748f27 | 394 | return NULL; |
c04d4f40 | 395 | } /* squidaio_thread_loop */ |
cd748f27 | 396 | |
397 | static void | |
c04d4f40 | 398 | squidaio_queue_request(squidaio_request_t * request) |
cd748f27 | 399 | { |
cd748f27 | 400 | static int high_start = 0; |
99cce4cb | 401 | debug(43, 9) ("squidaio_queue_request: %p type=%d result=%p\n", |
f0debecb | 402 | request, request->request_type, request->resultp); |
cd748f27 | 403 | /* Mark it as not executed (failing result, no error) */ |
55f0e6f7 | 404 | request->ret = -1; |
405 | request->err = 0; | |
406 | /* Internal housekeeping */ | |
407 | request_queue_len += 1; | |
408 | request->resultp->_data = request; | |
409 | /* Play some tricks with the request_queue2 queue */ | |
410 | request->next = NULL; | |
40173038 | 411 | if (pthread_mutex_trylock(&request_queue.mutex) == 0) { |
412 | if (request_queue2.head) { | |
413 | /* Grab blocked requests */ | |
55f0e6f7 | 414 | *request_queue.tailp = request_queue2.head; |
40173038 | 415 | request_queue.tailp = request_queue2.tailp; |
416 | } | |
417 | /* Enqueue request */ | |
418 | *request_queue.tailp = request; | |
419 | request_queue.tailp = &request->next; | |
420 | pthread_cond_signal(&request_queue.cond); | |
421 | pthread_mutex_unlock(&request_queue.mutex); | |
422 | if (request_queue2.head) { | |
423 | /* Clear queue of blocked requests */ | |
55f0e6f7 | 424 | request_queue2.head = NULL; |
425 | request_queue2.tailp = &request_queue2.head; | |
55f0e6f7 | 426 | } |
40173038 | 427 | } else { |
428 | /* Oops, the request queue is blocked, use request_queue2 */ | |
429 | *request_queue2.tailp = request; | |
430 | request_queue2.tailp = &request->next; | |
55f0e6f7 | 431 | } |
432 | if (request_queue2.head) { | |
433 | static int filter = 0; | |
434 | static int filter_limit = 8; | |
435 | if (++filter >= filter_limit) { | |
436 | filter_limit += filter; | |
437 | filter = 0; | |
c04d4f40 | 438 | debug(43, 1) ("squidaio_queue_request: WARNING - Queue congestion\n"); |
55f0e6f7 | 439 | } |
cd748f27 | 440 | } |
cd748f27 | 441 | /* Warn if out of threads */ |
55f0e6f7 | 442 | if (request_queue_len > MAGIC1) { |
443 | static int last_warn = 0; | |
444 | static int queue_high, queue_low; | |
cd748f27 | 445 | if (high_start == 0) { |
446 | high_start = squid_curtime; | |
447 | queue_high = request_queue_len; | |
448 | queue_low = request_queue_len; | |
449 | } | |
450 | if (request_queue_len > queue_high) | |
451 | queue_high = request_queue_len; | |
452 | if (request_queue_len < queue_low) | |
453 | queue_low = request_queue_len; | |
454 | if (squid_curtime >= (last_warn + 15) && | |
55f0e6f7 | 455 | squid_curtime >= (high_start + 5)) { |
c04d4f40 | 456 | debug(43, 1) ("squidaio_queue_request: WARNING - Disk I/O overloading\n"); |
55f0e6f7 | 457 | if (squid_curtime >= (high_start + 15)) |
33272404 | 458 | debug(43, 1) ("squidaio_queue_request: Queue Length: current=%d, high=%d, low=%d, duration=%ld\n", |
459 | request_queue_len, queue_high, queue_low, (long int) (squid_curtime - high_start)); | |
cd748f27 | 460 | last_warn = squid_curtime; |
461 | } | |
462 | } else { | |
463 | high_start = 0; | |
464 | } | |
55f0e6f7 | 465 | /* Warn if seriously overloaded */ |
cd748f27 | 466 | if (request_queue_len > RIDICULOUS_LENGTH) { |
c04d4f40 | 467 | debug(43, 0) ("squidaio_queue_request: Async request queue growing uncontrollably!\n"); |
468 | debug(43, 0) ("squidaio_queue_request: Syncing pending I/O operations.. (blocking)\n"); | |
469 | squidaio_sync(); | |
470 | debug(43, 0) ("squidaio_queue_request: Synced\n"); | |
cd748f27 | 471 | } |
c04d4f40 | 472 | } /* squidaio_queue_request */ |
cd748f27 | 473 | |
cd748f27 | 474 | static void |
c04d4f40 | 475 | squidaio_cleanup_request(squidaio_request_t * requestp) |
cd748f27 | 476 | { |
c04d4f40 | 477 | squidaio_result_t *resultp = requestp->resultp; |
cd748f27 | 478 | int cancelled = requestp->cancelled; |
479 | ||
480 | /* Free allocated structures and copy data back to user space if the */ | |
481 | /* request hasn't been cancelled */ | |
482 | switch (requestp->request_type) { | |
483 | case _AIO_OP_STAT: | |
484 | if (!cancelled && requestp->ret == 0) | |
485 | xmemcpy(requestp->statp, requestp->tmpstatp, sizeof(struct stat)); | |
c04d4f40 | 486 | squidaio_xfree(requestp->tmpstatp, sizeof(struct stat)); |
487 | squidaio_xstrfree(requestp->path); | |
55f0e6f7 | 488 | break; |
cd748f27 | 489 | case _AIO_OP_OPEN: |
490 | if (cancelled && requestp->ret >= 0) | |
491 | /* The open() was cancelled but completed */ | |
492 | close(requestp->ret); | |
c04d4f40 | 493 | squidaio_xstrfree(requestp->path); |
cd748f27 | 494 | break; |
495 | case _AIO_OP_CLOSE: | |
496 | if (cancelled && requestp->ret < 0) | |
497 | /* The close() was cancelled and never got executed */ | |
498 | close(requestp->fd); | |
499 | break; | |
500 | case _AIO_OP_UNLINK: | |
15a47d1d | 501 | case _AIO_OP_TRUNCATE: |
cd748f27 | 502 | case _AIO_OP_OPENDIR: |
c04d4f40 | 503 | squidaio_xstrfree(requestp->path); |
cd748f27 | 504 | break; |
505 | case _AIO_OP_READ: | |
506 | if (!cancelled && requestp->ret > 0) | |
507 | xmemcpy(requestp->bufferp, requestp->tmpbufp, requestp->ret); | |
c04d4f40 | 508 | squidaio_xfree(requestp->tmpbufp, requestp->buflen); |
55f0e6f7 | 509 | break; |
cd748f27 | 510 | case _AIO_OP_WRITE: |
c04d4f40 | 511 | squidaio_xfree(requestp->tmpbufp, requestp->buflen); |
cd748f27 | 512 | break; |
513 | default: | |
514 | break; | |
515 | } | |
516 | if (resultp != NULL && !cancelled) { | |
517 | resultp->aio_return = requestp->ret; | |
518 | resultp->aio_errno = requestp->err; | |
519 | } | |
c04d4f40 | 520 | memPoolFree(squidaio_request_pool, requestp); |
521 | } /* squidaio_cleanup_request */ | |
cd748f27 | 522 | |
523 | ||
524 | int | |
c04d4f40 | 525 | squidaio_cancel(squidaio_result_t * resultp) |
cd748f27 | 526 | { |
e6ccf245 | 527 | squidaio_request_t *request = (squidaio_request_t *)resultp->_data; |
cd748f27 | 528 | |
55f0e6f7 | 529 | if (request && request->resultp == resultp) { |
99cce4cb | 530 | debug(43, 9) ("squidaio_cancel: %p type=%d result=%p\n", |
f0debecb | 531 | request, request->request_type, request->resultp); |
55f0e6f7 | 532 | request->cancelled = 1; |
533 | request->resultp = NULL; | |
534 | resultp->_data = NULL; | |
12e137b0 | 535 | resultp->result_type = _AIO_OP_NONE; |
55f0e6f7 | 536 | return 0; |
537 | } | |
cd748f27 | 538 | return 1; |
c04d4f40 | 539 | } /* squidaio_cancel */ |
cd748f27 | 540 | |
541 | ||
542 | int | |
c04d4f40 | 543 | squidaio_open(const char *path, int oflag, mode_t mode, squidaio_result_t * resultp) |
cd748f27 | 544 | { |
c04d4f40 | 545 | squidaio_request_t *requestp; |
cd748f27 | 546 | |
c04d4f40 | 547 | if (!squidaio_initialised) |
548 | squidaio_init(); | |
e6ccf245 | 549 | requestp = (squidaio_request_t *)memPoolAlloc(squidaio_request_pool); |
c04d4f40 | 550 | requestp->path = (char *) squidaio_xstrdup(path); |
cd748f27 | 551 | requestp->oflag = oflag; |
552 | requestp->mode = mode; | |
553 | requestp->resultp = resultp; | |
554 | requestp->request_type = _AIO_OP_OPEN; | |
555 | requestp->cancelled = 0; | |
12e137b0 | 556 | resultp->result_type = _AIO_OP_OPEN; |
cd748f27 | 557 | |
c04d4f40 | 558 | squidaio_queue_request(requestp); |
cd748f27 | 559 | return 0; |
560 | } | |
561 | ||
562 | ||
563 | static void | |
c04d4f40 | 564 | squidaio_do_open(squidaio_request_t * requestp) |
cd748f27 | 565 | { |
566 | requestp->ret = open(requestp->path, requestp->oflag, requestp->mode); | |
567 | requestp->err = errno; | |
568 | } | |
569 | ||
570 | ||
571 | int | |
c04d4f40 | 572 | squidaio_read(int fd, char *bufp, int bufs, off_t offset, int whence, squidaio_result_t * resultp) |
cd748f27 | 573 | { |
c04d4f40 | 574 | squidaio_request_t *requestp; |
cd748f27 | 575 | |
c04d4f40 | 576 | if (!squidaio_initialised) |
577 | squidaio_init(); | |
e6ccf245 | 578 | requestp = (squidaio_request_t *)memPoolAlloc(squidaio_request_pool); |
cd748f27 | 579 | requestp->fd = fd; |
580 | requestp->bufferp = bufp; | |
c04d4f40 | 581 | requestp->tmpbufp = (char *) squidaio_xmalloc(bufs); |
cd748f27 | 582 | requestp->buflen = bufs; |
583 | requestp->offset = offset; | |
584 | requestp->whence = whence; | |
585 | requestp->resultp = resultp; | |
586 | requestp->request_type = _AIO_OP_READ; | |
587 | requestp->cancelled = 0; | |
12e137b0 | 588 | resultp->result_type = _AIO_OP_READ; |
cd748f27 | 589 | |
c04d4f40 | 590 | squidaio_queue_request(requestp); |
cd748f27 | 591 | return 0; |
592 | } | |
593 | ||
594 | ||
595 | static void | |
c04d4f40 | 596 | squidaio_do_read(squidaio_request_t * requestp) |
cd748f27 | 597 | { |
598 | lseek(requestp->fd, requestp->offset, requestp->whence); | |
599 | requestp->ret = read(requestp->fd, requestp->tmpbufp, requestp->buflen); | |
600 | requestp->err = errno; | |
601 | } | |
602 | ||
603 | ||
604 | int | |
c04d4f40 | 605 | squidaio_write(int fd, char *bufp, int bufs, off_t offset, int whence, squidaio_result_t * resultp) |
cd748f27 | 606 | { |
c04d4f40 | 607 | squidaio_request_t *requestp; |
cd748f27 | 608 | |
c04d4f40 | 609 | if (!squidaio_initialised) |
610 | squidaio_init(); | |
e6ccf245 | 611 | requestp = (squidaio_request_t *)memPoolAlloc(squidaio_request_pool); |
cd748f27 | 612 | requestp->fd = fd; |
c04d4f40 | 613 | requestp->tmpbufp = (char *) squidaio_xmalloc(bufs); |
cd748f27 | 614 | xmemcpy(requestp->tmpbufp, bufp, bufs); |
615 | requestp->buflen = bufs; | |
616 | requestp->offset = offset; | |
617 | requestp->whence = whence; | |
618 | requestp->resultp = resultp; | |
619 | requestp->request_type = _AIO_OP_WRITE; | |
620 | requestp->cancelled = 0; | |
12e137b0 | 621 | resultp->result_type = _AIO_OP_WRITE; |
cd748f27 | 622 | |
c04d4f40 | 623 | squidaio_queue_request(requestp); |
cd748f27 | 624 | return 0; |
625 | } | |
626 | ||
627 | ||
628 | static void | |
c04d4f40 | 629 | squidaio_do_write(squidaio_request_t * requestp) |
cd748f27 | 630 | { |
631 | requestp->ret = write(requestp->fd, requestp->tmpbufp, requestp->buflen); | |
632 | requestp->err = errno; | |
633 | } | |
634 | ||
635 | ||
636 | int | |
c04d4f40 | 637 | squidaio_close(int fd, squidaio_result_t * resultp) |
cd748f27 | 638 | { |
c04d4f40 | 639 | squidaio_request_t *requestp; |
cd748f27 | 640 | |
c04d4f40 | 641 | if (!squidaio_initialised) |
642 | squidaio_init(); | |
e6ccf245 | 643 | requestp = (squidaio_request_t *)memPoolAlloc(squidaio_request_pool); |
cd748f27 | 644 | requestp->fd = fd; |
645 | requestp->resultp = resultp; | |
646 | requestp->request_type = _AIO_OP_CLOSE; | |
647 | requestp->cancelled = 0; | |
12e137b0 | 648 | resultp->result_type = _AIO_OP_CLOSE; |
cd748f27 | 649 | |
c04d4f40 | 650 | squidaio_queue_request(requestp); |
cd748f27 | 651 | return 0; |
652 | } | |
653 | ||
654 | ||
655 | static void | |
c04d4f40 | 656 | squidaio_do_close(squidaio_request_t * requestp) |
cd748f27 | 657 | { |
658 | requestp->ret = close(requestp->fd); | |
659 | requestp->err = errno; | |
660 | } | |
661 | ||
662 | ||
663 | int | |
c04d4f40 | 664 | squidaio_stat(const char *path, struct stat *sb, squidaio_result_t * resultp) |
cd748f27 | 665 | { |
c04d4f40 | 666 | squidaio_request_t *requestp; |
cd748f27 | 667 | |
c04d4f40 | 668 | if (!squidaio_initialised) |
669 | squidaio_init(); | |
e6ccf245 | 670 | requestp = (squidaio_request_t *)memPoolAlloc(squidaio_request_pool); |
c04d4f40 | 671 | requestp->path = (char *) squidaio_xstrdup(path); |
cd748f27 | 672 | requestp->statp = sb; |
c04d4f40 | 673 | requestp->tmpstatp = (struct stat *) squidaio_xmalloc(sizeof(struct stat)); |
cd748f27 | 674 | requestp->resultp = resultp; |
675 | requestp->request_type = _AIO_OP_STAT; | |
676 | requestp->cancelled = 0; | |
12e137b0 | 677 | resultp->result_type = _AIO_OP_STAT; |
cd748f27 | 678 | |
c04d4f40 | 679 | squidaio_queue_request(requestp); |
cd748f27 | 680 | return 0; |
681 | } | |
682 | ||
683 | ||
684 | static void | |
c04d4f40 | 685 | squidaio_do_stat(squidaio_request_t * requestp) |
cd748f27 | 686 | { |
687 | requestp->ret = stat(requestp->path, requestp->tmpstatp); | |
688 | requestp->err = errno; | |
689 | } | |
690 | ||
691 | ||
692 | int | |
c04d4f40 | 693 | squidaio_unlink(const char *path, squidaio_result_t * resultp) |
cd748f27 | 694 | { |
c04d4f40 | 695 | squidaio_request_t *requestp; |
cd748f27 | 696 | |
c04d4f40 | 697 | if (!squidaio_initialised) |
698 | squidaio_init(); | |
e6ccf245 | 699 | requestp = (squidaio_request_t *)memPoolAlloc(squidaio_request_pool); |
c04d4f40 | 700 | requestp->path = squidaio_xstrdup(path); |
cd748f27 | 701 | requestp->resultp = resultp; |
702 | requestp->request_type = _AIO_OP_UNLINK; | |
703 | requestp->cancelled = 0; | |
12e137b0 | 704 | resultp->result_type = _AIO_OP_UNLINK; |
cd748f27 | 705 | |
c04d4f40 | 706 | squidaio_queue_request(requestp); |
cd748f27 | 707 | return 0; |
708 | } | |
709 | ||
710 | ||
711 | static void | |
c04d4f40 | 712 | squidaio_do_unlink(squidaio_request_t * requestp) |
cd748f27 | 713 | { |
714 | requestp->ret = unlink(requestp->path); | |
715 | requestp->err = errno; | |
716 | } | |
717 | ||
15a47d1d | 718 | int |
c04d4f40 | 719 | squidaio_truncate(const char *path, off_t length, squidaio_result_t * resultp) |
15a47d1d | 720 | { |
c04d4f40 | 721 | squidaio_request_t *requestp; |
15a47d1d | 722 | |
c04d4f40 | 723 | if (!squidaio_initialised) |
724 | squidaio_init(); | |
e6ccf245 | 725 | requestp = (squidaio_request_t *)memPoolAlloc(squidaio_request_pool); |
c04d4f40 | 726 | requestp->path = (char *) squidaio_xstrdup(path); |
15a47d1d | 727 | requestp->offset = length; |
15a47d1d | 728 | requestp->resultp = resultp; |
729 | requestp->request_type = _AIO_OP_TRUNCATE; | |
730 | requestp->cancelled = 0; | |
12e137b0 | 731 | resultp->result_type = _AIO_OP_TRUNCATE; |
15a47d1d | 732 | |
c04d4f40 | 733 | squidaio_queue_request(requestp); |
15a47d1d | 734 | return 0; |
735 | } | |
736 | ||
737 | ||
738 | static void | |
c04d4f40 | 739 | squidaio_do_truncate(squidaio_request_t * requestp) |
15a47d1d | 740 | { |
741 | requestp->ret = truncate(requestp->path, requestp->offset); | |
742 | requestp->err = errno; | |
743 | } | |
744 | ||
cd748f27 | 745 | |
746 | #if AIO_OPENDIR | |
c04d4f40 | 747 | /* XXX squidaio_opendir NOT implemented yet.. */ |
cd748f27 | 748 | |
749 | int | |
c04d4f40 | 750 | squidaio_opendir(const char *path, squidaio_result_t * resultp) |
cd748f27 | 751 | { |
c04d4f40 | 752 | squidaio_request_t *requestp; |
cd748f27 | 753 | int len; |
754 | ||
c04d4f40 | 755 | if (!squidaio_initialised) |
756 | squidaio_init(); | |
757 | requestp = memPoolAlloc(squidaio_request_pool); | |
12e137b0 | 758 | resultp->result_type = _AIO_OP_OPENDIR; |
cd748f27 | 759 | return -1; |
760 | } | |
761 | ||
762 | static void | |
c04d4f40 | 763 | squidaio_do_opendir(squidaio_request_t * requestp) |
cd748f27 | 764 | { |
765 | /* NOT IMPLEMENTED */ | |
766 | } | |
767 | ||
768 | #endif | |
769 | ||
55f0e6f7 | 770 | static void |
c04d4f40 | 771 | squidaio_poll_queues(void) |
55f0e6f7 | 772 | { |
773 | /* kick "overflow" request queue */ | |
774 | if (request_queue2.head && | |
4672d0cd | 775 | pthread_mutex_trylock(&request_queue.mutex) == 0) { |
55f0e6f7 | 776 | *request_queue.tailp = request_queue2.head; |
777 | request_queue.tailp = request_queue2.tailp; | |
778 | pthread_cond_signal(&request_queue.cond); | |
779 | pthread_mutex_unlock(&request_queue.mutex); | |
780 | request_queue2.head = NULL; | |
781 | request_queue2.tailp = &request_queue2.head; | |
782 | } | |
783 | /* poll done queue */ | |
784 | if (done_queue.head && pthread_mutex_trylock(&done_queue.mutex) == 0) { | |
c04d4f40 | 785 | struct squidaio_request_t *requests = done_queue.head; |
55f0e6f7 | 786 | done_queue.head = NULL; |
787 | done_queue.tailp = &done_queue.head; | |
788 | pthread_mutex_unlock(&done_queue.mutex); | |
789 | *done_requests.tailp = requests; | |
790 | request_queue_len -= 1; | |
4672d0cd | 791 | while (requests->next) { |
55f0e6f7 | 792 | requests = requests->next; |
793 | request_queue_len -= 1; | |
cd748f27 | 794 | } |
55f0e6f7 | 795 | done_requests.tailp = &requests->next; |
796 | } | |
5e5c622b | 797 | #if HAVE_SCHED_H |
55f0e6f7 | 798 | /* Give up the CPU to allow the threads to do their work */ |
4672d0cd | 799 | /* |
800 | * For Andres thoughts about yield(), see | |
801 | * http://www.squid-cache.org/mail-archive/squid-dev/200012/0001.html | |
802 | */ | |
55f0e6f7 | 803 | if (done_queue.head || request_queue.head) |
4672d0cd | 804 | #ifndef _SQUID_SOLARIS_ |
55f0e6f7 | 805 | sched_yield(); |
4672d0cd | 806 | #else |
807 | yield(); | |
808 | #endif | |
5e5c622b | 809 | #endif |
55f0e6f7 | 810 | } |
cd748f27 | 811 | |
c04d4f40 | 812 | squidaio_result_t * |
813 | squidaio_poll_done(void) | |
cd748f27 | 814 | { |
c04d4f40 | 815 | squidaio_request_t *request; |
816 | squidaio_result_t *resultp; | |
cd748f27 | 817 | int cancelled; |
55f0e6f7 | 818 | int polled = 0; |
cd748f27 | 819 | |
820 | AIO_REPOLL: | |
55f0e6f7 | 821 | request = done_requests.head; |
822 | if (request == NULL && !polled) { | |
c04d4f40 | 823 | squidaio_poll_queues(); |
55f0e6f7 | 824 | polled = 1; |
825 | request = done_requests.head; | |
826 | } | |
827 | if (!request) { | |
cd748f27 | 828 | return NULL; |
829 | } | |
99cce4cb | 830 | debug(43, 9) ("squidaio_poll_done: %p type=%d result=%p\n", |
f0debecb | 831 | request, request->request_type, request->resultp); |
55f0e6f7 | 832 | done_requests.head = request->next; |
833 | if (!done_requests.head) | |
834 | done_requests.tailp = &done_requests.head; | |
835 | resultp = request->resultp; | |
836 | cancelled = request->cancelled; | |
c04d4f40 | 837 | squidaio_debug(request); |
55f0e6f7 | 838 | debug(43, 5) ("DONE: %d -> %d\n", request->ret, request->err); |
c04d4f40 | 839 | squidaio_cleanup_request(request); |
cd748f27 | 840 | if (cancelled) |
841 | goto AIO_REPOLL; | |
842 | return resultp; | |
c04d4f40 | 843 | } /* squidaio_poll_done */ |
cd748f27 | 844 | |
845 | int | |
c04d4f40 | 846 | squidaio_operations_pending(void) |
cd748f27 | 847 | { |
55f0e6f7 | 848 | return request_queue_len + (done_requests.head ? 1 : 0); |
cd748f27 | 849 | } |
850 | ||
851 | int | |
c04d4f40 | 852 | squidaio_sync(void) |
cd748f27 | 853 | { |
55f0e6f7 | 854 | /* XXX This might take a while if the queue is large.. */ |
cd748f27 | 855 | do { |
c04d4f40 | 856 | squidaio_poll_queues(); |
cd748f27 | 857 | } while (request_queue_len > 0); |
c04d4f40 | 858 | return squidaio_operations_pending(); |
cd748f27 | 859 | } |
860 | ||
861 | int | |
c04d4f40 | 862 | squidaio_get_queue_len(void) |
cd748f27 | 863 | { |
864 | return request_queue_len; | |
865 | } | |
866 | ||
867 | static void | |
c04d4f40 | 868 | squidaio_debug(squidaio_request_t * request) |
cd748f27 | 869 | { |
55f0e6f7 | 870 | switch (request->request_type) { |
cd748f27 | 871 | case _AIO_OP_OPEN: |
55f0e6f7 | 872 | debug(43, 5) ("OPEN of %s to FD %d\n", request->path, request->ret); |
cd748f27 | 873 | break; |
874 | case _AIO_OP_READ: | |
55f0e6f7 | 875 | debug(43, 5) ("READ on fd: %d\n", request->fd); |
cd748f27 | 876 | break; |
877 | case _AIO_OP_WRITE: | |
55f0e6f7 | 878 | debug(43, 5) ("WRITE on fd: %d\n", request->fd); |
cd748f27 | 879 | break; |
880 | case _AIO_OP_CLOSE: | |
55f0e6f7 | 881 | debug(43, 5) ("CLOSE of fd: %d\n", request->fd); |
cd748f27 | 882 | break; |
883 | case _AIO_OP_UNLINK: | |
55f0e6f7 | 884 | debug(43, 5) ("UNLINK of %s\n", request->path); |
cd748f27 | 885 | break; |
15a47d1d | 886 | case _AIO_OP_TRUNCATE: |
55f0e6f7 | 887 | debug(43, 5) ("UNLINK of %s\n", request->path); |
15a47d1d | 888 | break; |
cd748f27 | 889 | default: |
890 | break; | |
891 | } | |
892 | } |