gitlab.com/CoiaPrant/sqlite3@v1.19.1/testdata/tcl/threadtest4.c (about) 1 /* 2 ** 2014-12-11 3 ** 4 ** The author disclaims copyright to this source code. In place of 5 ** a legal notice, here is a blessing: 6 ** 7 ** May you do good and not evil. 8 ** May you find forgiveness for yourself and forgive others. 9 ** May you share freely, never taking more than you give. 10 ** 11 ************************************************************************* 12 ** This file implements a simple standalone program used to stress the 13 ** SQLite library when accessing the same set of databases simultaneously 14 ** from multiple threads in shared-cache mode. 15 ** 16 ** This test program runs on unix-like systems only. It uses pthreads. 17 ** To compile: 18 ** 19 ** gcc -g -Wall -I. threadtest4.c sqlite3.c -ldl -lpthread 20 ** 21 ** To run: 22 ** 23 ** ./a.out 10 24 ** 25 ** The argument is the number of threads. There are also options, such 26 ** as -wal and -multithread and -serialized. 27 ** 28 ** Consider also compiling with clang instead of gcc and adding the 29 ** -fsanitize=thread option. 30 */ 31 #include "sqlite3.h" 32 #include <pthread.h> 33 #include <sched.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 #include <stdarg.h> 39 40 /* 41 ** An instance of the following structure is passed into each worker 42 ** thread. 43 */ 44 typedef struct WorkerInfo WorkerInfo; 45 struct WorkerInfo { 46 int tid; /* Thread ID */ 47 int nWorker; /* Total number of workers */ 48 unsigned wkrFlags; /* Flags */ 49 sqlite3 *mainDb; /* Database connection of the main thread */ 50 sqlite3 *db; /* Database connection of this thread */ 51 int nErr; /* Number of errors seen by this thread */ 52 int nTest; /* Number of tests run by this thread */ 53 char *zMsg; /* Message returned by this thread */ 54 pthread_t id; /* Thread id */ 55 pthread_mutex_t *pWrMutex; /* Hold this mutex while writing */ 56 }; 57 58 /* 59 ** Allowed values for WorkerInfo.wkrFlags 60 */ 61 #define TT4_SERIALIZED 0x0000001 /* The --serialized option is used */ 62 #define TT4_WAL 0x0000002 /* WAL mode in use */ 63 #define TT4_TRACE 0x0000004 /* Trace activity */ 64 65 66 /* 67 ** Report an OOM error and die if the argument is NULL 68 */ 69 static void check_oom(void *x){ 70 if( x==0 ){ 71 fprintf(stderr, "out of memory\n"); 72 exit(1); 73 } 74 } 75 76 /* 77 ** Allocate memory. If the allocation fails, print an error message and 78 ** kill the process. 79 */ 80 static void *safe_malloc(int sz){ 81 void *x = sqlite3_malloc(sz>0?sz:1); 82 check_oom(x); 83 return x; 84 } 85 86 /* 87 ** Print a trace message for a worker 88 */ 89 static void worker_trace(WorkerInfo *p, const char *zFormat, ...){ 90 va_list ap; 91 char *zMsg; 92 if( (p->wkrFlags & TT4_TRACE)==0 ) return; 93 va_start(ap, zFormat); 94 zMsg = sqlite3_vmprintf(zFormat, ap); 95 check_oom(zMsg); 96 va_end(ap); 97 fprintf(stderr, "TRACE(%02d): %s\n", p->tid, zMsg); 98 sqlite3_free(zMsg); 99 } 100 101 /* 102 ** Prepare a single SQL query 103 */ 104 static sqlite3_stmt *prep_sql(sqlite3 *db, const char *zFormat, ...){ 105 va_list ap; 106 char *zSql; 107 int rc; 108 sqlite3_stmt *pStmt = 0; 109 110 va_start(ap, zFormat); 111 zSql = sqlite3_vmprintf(zFormat, ap); 112 va_end(ap); 113 check_oom(zSql); 114 rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0); 115 if( rc!=SQLITE_OK ){ 116 fprintf(stderr, "SQL error (%d,%d): %s\nWhile preparing: [%s]\n", 117 rc, sqlite3_extended_errcode(db), sqlite3_errmsg(db), zSql); 118 exit(1); 119 } 120 sqlite3_free(zSql); 121 return pStmt; 122 } 123 124 /* 125 ** Run a SQL statements. Panic if unable. 126 */ 127 static void run_sql(WorkerInfo *p, const char *zFormat, ...){ 128 va_list ap; 129 char *zSql; 130 int rc; 131 sqlite3_stmt *pStmt = 0; 132 int nRetry = 0; 133 134 va_start(ap, zFormat); 135 zSql = sqlite3_vmprintf(zFormat, ap); 136 va_end(ap); 137 check_oom(zSql); 138 rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0); 139 if( rc!=SQLITE_OK ){ 140 fprintf(stderr, "SQL error (%d,%d): %s\nWhile preparing: [%s]\n", 141 rc, sqlite3_extended_errcode(p->db), sqlite3_errmsg(p->db), zSql); 142 exit(1); 143 } 144 worker_trace(p, "running [%s]", zSql); 145 while( (rc = sqlite3_step(pStmt))!=SQLITE_DONE ){ 146 if( (rc&0xff)==SQLITE_BUSY || (rc&0xff)==SQLITE_LOCKED ){ 147 sqlite3_reset(pStmt); 148 nRetry++; 149 if( nRetry<10 ){ 150 worker_trace(p, "retry %d for [%s]", nRetry, zSql); 151 sched_yield(); 152 continue; 153 }else{ 154 fprintf(stderr, "Deadlock in thread %d while running [%s]\n", 155 p->tid, zSql); 156 exit(1); 157 } 158 } 159 if( rc!=SQLITE_ROW ){ 160 fprintf(stderr, "SQL error (%d,%d): %s\nWhile running [%s]\n", 161 rc, sqlite3_extended_errcode(p->db), sqlite3_errmsg(p->db), zSql); 162 exit(1); 163 } 164 } 165 sqlite3_free(zSql); 166 sqlite3_finalize(pStmt); 167 } 168 169 170 /* 171 ** Open the database connection for WorkerInfo. The order in which 172 ** the files are opened is a function of the tid value. 173 */ 174 static void worker_open_connection(WorkerInfo *p, int iCnt){ 175 char *zFile; 176 int x; 177 int rc; 178 static const unsigned char aOrder[6][3] = { 179 { 1, 2, 3}, 180 { 1, 3, 2}, 181 { 2, 1, 3}, 182 { 2, 3, 1}, 183 { 3, 1, 2}, 184 { 3, 2, 1} 185 }; 186 x = (p->tid + iCnt) % 6; 187 zFile = sqlite3_mprintf("tt4-test%d.db", aOrder[x][0]); 188 check_oom(zFile); 189 worker_trace(p, "open %s", zFile); 190 rc = sqlite3_open_v2(zFile, &p->db, 191 SQLITE_OPEN_READWRITE|SQLITE_OPEN_SHAREDCACHE, 0); 192 if( rc!=SQLITE_OK ){ 193 fprintf(stderr, "sqlite_open_v2(%s) failed on thread %d\n", 194 zFile, p->tid); 195 exit(1); 196 } 197 sqlite3_free(zFile); 198 run_sql(p, "PRAGMA read_uncommitted=ON;"); 199 sqlite3_busy_timeout(p->db, 10000); 200 run_sql(p, "PRAGMA synchronous=OFF;"); 201 run_sql(p, "ATTACH 'tt4-test%d.db' AS aux1", aOrder[x][1]); 202 run_sql(p, "ATTACH 'tt4-test%d.db' AS aux2", aOrder[x][2]); 203 } 204 205 /* 206 ** Close the worker database connection 207 */ 208 static void worker_close_connection(WorkerInfo *p){ 209 if( p->db ){ 210 worker_trace(p, "close"); 211 sqlite3_close(p->db); 212 p->db = 0; 213 } 214 } 215 216 /* 217 ** Delete all content in the three databases associated with a 218 ** single thread. Make this happen all in a single transaction if 219 ** inTrans is true, or separately for each database if inTrans is 220 ** false. 221 */ 222 static void worker_delete_all_content(WorkerInfo *p, int inTrans){ 223 if( inTrans ){ 224 pthread_mutex_lock(p->pWrMutex); 225 run_sql(p, "BEGIN"); 226 run_sql(p, "DELETE FROM t1 WHERE tid=%d", p->tid); 227 run_sql(p, "DELETE FROM t2 WHERE tid=%d", p->tid); 228 run_sql(p, "DELETE FROM t3 WHERE tid=%d", p->tid); 229 run_sql(p, "COMMIT"); 230 pthread_mutex_unlock(p->pWrMutex); 231 p->nTest++; 232 }else{ 233 pthread_mutex_lock(p->pWrMutex); 234 run_sql(p, "DELETE FROM t1 WHERE tid=%d", p->tid); 235 pthread_mutex_unlock(p->pWrMutex); 236 p->nTest++; 237 pthread_mutex_lock(p->pWrMutex); 238 run_sql(p, "DELETE FROM t2 WHERE tid=%d", p->tid); 239 pthread_mutex_unlock(p->pWrMutex); 240 p->nTest++; 241 pthread_mutex_lock(p->pWrMutex); 242 run_sql(p, "DELETE FROM t3 WHERE tid=%d", p->tid); 243 pthread_mutex_unlock(p->pWrMutex); 244 p->nTest++; 245 } 246 } 247 248 /* 249 ** Create rows mn through mx in table iTab for the given worker 250 */ 251 static void worker_add_content(WorkerInfo *p, int mn, int mx, int iTab){ 252 char *zTabDef; 253 switch( iTab ){ 254 case 1: zTabDef = "t1(tid,sp,a,b,c)"; break; 255 case 2: zTabDef = "t2(tid,sp,d,e,f)"; break; 256 case 3: zTabDef = "t3(tid,sp,x,y,z)"; break; 257 } 258 pthread_mutex_lock(p->pWrMutex); 259 run_sql(p, 260 "WITH RECURSIVE\n" 261 " c(i) AS (VALUES(%d) UNION ALL SELECT i+1 FROM c WHERE i<%d)\n" 262 "INSERT INTO %s SELECT %d, zeroblob(3000), i, printf('%%d',i), i FROM c;", 263 mn, mx, zTabDef, p->tid 264 ); 265 pthread_mutex_unlock(p->pWrMutex); 266 p->nTest++; 267 } 268 269 /* 270 ** Set an error message on a worker 271 */ 272 static void worker_error(WorkerInfo *p, const char *zFormat, ...){ 273 va_list ap; 274 p->nErr++; 275 sqlite3_free(p->zMsg); 276 va_start(ap, zFormat); 277 p->zMsg = sqlite3_vmprintf(zFormat, ap); 278 va_end(ap); 279 } 280 281 /* 282 ** Each thread runs the following function. 283 */ 284 static void *worker_thread(void *pArg){ 285 WorkerInfo *p = (WorkerInfo*)pArg; 286 int iOuter; 287 int i; 288 int rc; 289 sqlite3_stmt *pStmt; 290 291 printf("worker %d startup\n", p->tid); fflush(stdout); 292 for(iOuter=1; iOuter<=p->nWorker; iOuter++){ 293 worker_open_connection(p, iOuter); 294 for(i=0; i<4; i++){ 295 worker_add_content(p, i*100+1, (i+1)*100, (p->tid+iOuter)%3 + 1); 296 worker_add_content(p, i*100+1, (i+1)*100, (p->tid+iOuter+1)%3 + 1); 297 worker_add_content(p, i*100+1, (i+1)*100, (p->tid+iOuter+2)%3 + 1); 298 } 299 300 pStmt = prep_sql(p->db, "SELECT count(a) FROM t1 WHERE tid=%d", p->tid); 301 worker_trace(p, "query [%s]", sqlite3_sql(pStmt)); 302 rc = sqlite3_step(pStmt); 303 if( rc!=SQLITE_ROW ){ 304 worker_error(p, "Failed to step: %s", sqlite3_sql(pStmt)); 305 }else if( sqlite3_column_int(pStmt, 0)!=400 ){ 306 worker_error(p, "Wrong result: %d", sqlite3_column_int(pStmt,0)); 307 } 308 sqlite3_finalize(pStmt); 309 if( p->nErr ) break; 310 311 if( ((iOuter+p->tid)%3)==0 ){ 312 sqlite3_db_release_memory(p->db); 313 p->nTest++; 314 } 315 316 pthread_mutex_lock(p->pWrMutex); 317 run_sql(p, "BEGIN;"); 318 run_sql(p, "UPDATE t1 SET c=NULL WHERE a=55"); 319 run_sql(p, "UPDATE t2 SET f=NULL WHERE d=42"); 320 run_sql(p, "UPDATE t3 SET z=NULL WHERE x=31"); 321 run_sql(p, "ROLLBACK;"); 322 p->nTest++; 323 pthread_mutex_unlock(p->pWrMutex); 324 325 326 if( iOuter==p->tid ){ 327 pthread_mutex_lock(p->pWrMutex); 328 run_sql(p, "VACUUM"); 329 pthread_mutex_unlock(p->pWrMutex); 330 } 331 332 pStmt = prep_sql(p->db, 333 "SELECT t1.rowid, t2.rowid, t3.rowid" 334 " FROM t1, t2, t3" 335 " WHERE t1.tid=%d AND t2.tid=%d AND t3.tid=%d" 336 " AND t1.a<>t2.d AND t2.d<>t3.x" 337 " ORDER BY 1, 2, 3" 338 ,p->tid, p->tid, p->tid); 339 worker_trace(p, "query [%s]", sqlite3_sql(pStmt)); 340 for(i=0; i<p->nWorker; i++){ 341 rc = sqlite3_step(pStmt); 342 if( rc!=SQLITE_ROW ){ 343 worker_error(p, "Failed to step: %s", sqlite3_sql(pStmt)); 344 break; 345 } 346 sched_yield(); 347 } 348 sqlite3_finalize(pStmt); 349 if( p->nErr ) break; 350 351 worker_delete_all_content(p, (p->tid+iOuter)%2); 352 worker_close_connection(p); 353 p->db = 0; 354 } 355 worker_close_connection(p); 356 printf("worker %d finished\n", p->tid); fflush(stdout); 357 return 0; 358 } 359 360 int main(int argc, char **argv){ 361 int nWorker = 0; /* Number of worker threads */ 362 int i; /* Loop counter */ 363 WorkerInfo *aInfo; /* Information for each worker */ 364 unsigned wkrFlags = 0; /* Default worker flags */ 365 int nErr = 0; /* Number of errors */ 366 int nTest = 0; /* Number of tests */ 367 int rc; /* Return code */ 368 sqlite3 *db = 0; /* Main database connection */ 369 pthread_mutex_t wrMutex; /* The write serialization mutex */ 370 WorkerInfo infoTop; /* WorkerInfo for the main thread */ 371 WorkerInfo *p; /* Pointer to infoTop */ 372 373 sqlite3_config(SQLITE_CONFIG_MULTITHREAD); 374 for(i=1; i<argc; i++){ 375 const char *z = argv[i]; 376 if( z[0]=='-' ){ 377 if( z[1]=='-' && z[2]!=0 ) z++; 378 if( strcmp(z,"-multithread")==0 ){ 379 sqlite3_config(SQLITE_CONFIG_MULTITHREAD); 380 wkrFlags &= ~TT4_SERIALIZED; 381 }else if( strcmp(z,"-serialized")==0 ){ 382 sqlite3_config(SQLITE_CONFIG_SERIALIZED); 383 wkrFlags |= TT4_SERIALIZED; 384 }else if( strcmp(z,"-wal")==0 ){ 385 wkrFlags |= TT4_WAL; 386 }else if( strcmp(z,"-trace")==0 ){ 387 wkrFlags |= TT4_TRACE; 388 }else{ 389 fprintf(stderr, "unknown command-line option: %s\n", argv[i]); 390 exit(1); 391 } 392 }else if( z[0]>='1' && z[0]<='9' && nWorker==0 ){ 393 nWorker = atoi(z); 394 if( nWorker<2 ){ 395 fprintf(stderr, "minimum of 2 threads\n"); 396 exit(1); 397 } 398 }else{ 399 fprintf(stderr, "extra command-line argument: \"%s\"\n", argv[i]); 400 exit(1); 401 } 402 } 403 if( nWorker==0 ){ 404 fprintf(stderr, 405 "usage: %s ?OPTIONS? N\n" 406 "N is the number of threads and must be at least 2.\n" 407 "Options:\n" 408 " --serialized\n" 409 " --multithread\n" 410 " --wal\n" 411 " --trace\n" 412 ,argv[0] 413 ); 414 exit(1); 415 } 416 if( !sqlite3_threadsafe() ){ 417 fprintf(stderr, "requires a threadsafe build of SQLite\n"); 418 exit(1); 419 } 420 sqlite3_initialize(); 421 sqlite3_enable_shared_cache(1); 422 pthread_mutex_init(&wrMutex, 0); 423 424 /* Initialize the test database files */ 425 (void)unlink("tt4-test1.db"); 426 (void)unlink("tt4-test2.db"); 427 (void)unlink("tt4-test3.db"); 428 rc = sqlite3_open("tt4-test1.db", &db); 429 if( rc!=SQLITE_OK ){ 430 fprintf(stderr, "Unable to open test database: tt4-test2.db\n"); 431 exit(1); 432 } 433 memset(&infoTop, 0, sizeof(infoTop)); 434 infoTop.db = db; 435 infoTop.wkrFlags = wkrFlags; 436 p = &infoTop; 437 if( wkrFlags & TT4_WAL ){ 438 run_sql(p, "PRAGMA journal_mode=WAL"); 439 } 440 run_sql(p, "PRAGMA synchronous=OFF"); 441 run_sql(p, "CREATE TABLE IF NOT EXISTS t1(tid INTEGER, sp, a, b, c)"); 442 run_sql(p, "CREATE INDEX t1tid ON t1(tid)"); 443 run_sql(p, "CREATE INDEX t1ab ON t1(a,b)"); 444 run_sql(p, "ATTACH 'tt4-test2.db' AS 'test2'"); 445 run_sql(p, "CREATE TABLE IF NOT EXISTS test2.t2(tid INTEGER, sp, d, e, f)"); 446 run_sql(p, "CREATE INDEX test2.t2tid ON t2(tid)"); 447 run_sql(p, "CREATE INDEX test2.t2de ON t2(d,e)"); 448 run_sql(p, "ATTACH 'tt4-test3.db' AS 'test3'"); 449 run_sql(p, "CREATE TABLE IF NOT EXISTS test3.t3(tid INTEGER, sp, x, y, z)"); 450 run_sql(p, "CREATE INDEX test3.t3tid ON t3(tid)"); 451 run_sql(p, "CREATE INDEX test3.t3xy ON t3(x,y)"); 452 aInfo = safe_malloc( sizeof(*aInfo)*nWorker ); 453 memset(aInfo, 0, sizeof(*aInfo)*nWorker); 454 for(i=0; i<nWorker; i++){ 455 aInfo[i].tid = i+1; 456 aInfo[i].nWorker = nWorker; 457 aInfo[i].wkrFlags = wkrFlags; 458 aInfo[i].mainDb = db; 459 aInfo[i].pWrMutex = &wrMutex; 460 rc = pthread_create(&aInfo[i].id, 0, worker_thread, &aInfo[i]); 461 if( rc!=0 ){ 462 fprintf(stderr, "thread creation failed for thread %d\n", i+1); 463 exit(1); 464 } 465 sched_yield(); 466 } 467 for(i=0; i<nWorker; i++){ 468 pthread_join(aInfo[i].id, 0); 469 printf("Joined thread %d: %d errors in %d tests", 470 aInfo[i].tid, aInfo[i].nErr, aInfo[i].nTest); 471 if( aInfo[i].zMsg ){ 472 printf(": %s\n", aInfo[i].zMsg); 473 }else{ 474 printf("\n"); 475 } 476 nErr += aInfo[i].nErr; 477 nTest += aInfo[i].nTest; 478 fflush(stdout); 479 } 480 sqlite3_close(db); 481 sqlite3_free(aInfo); 482 printf("Total %d errors in %d tests\n", nErr, nTest); 483 return nErr; 484 }