[sql] Import reference version of SQLite 3.17..

third_party/sqlite/sqlite-src-3170000/test/threadtest4.c

Index: third_party/sqlite/sqlite-src-3170000/test/threadtest4.c
diff --git a/third_party/sqlite/sqlite-src-3170000/test/threadtest4.c b/third_party/sqlite/sqlite-src-3170000/test/threadtest4.c
new file mode 100644
index 0000000000000000000000000000000000000000..da5ce75f051888c908eea952dcb17f39b3ac9456
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+++ b/third_party/sqlite/sqlite-src-3170000/test/threadtest4.c
@@ -0,0 +1,484 @@
+/*
+** 2014-12-11
+**
+** The author disclaims copyright to this source code.  In place of
+** a legal notice, here is a blessing:
+**
+**    May you do good and not evil.
+**    May you find forgiveness for yourself and forgive others.
+**    May you share freely, never taking more than you give.
+**
+*************************************************************************
+** This file implements a simple standalone program used to stress the
+** SQLite library when accessing the same set of databases simultaneously
+** from multiple threads in shared-cache mode.
+**
+** This test program runs on unix-like systems only.  It uses pthreads.
+** To compile:
+**
+**     gcc -g -Wall -I. threadtest4.c sqlite3.c -ldl -lpthread
+**
+** To run:
+**
+**     ./a.out 10
+**
+** The argument is the number of threads.  There are also options, such
+** as -wal and -multithread and -serialized.
+**
+** Consider also compiling with clang instead of gcc and adding the
+** -fsanitize=thread option.
+*/
+#include "sqlite3.h"
+#include <pthread.h>
+#include <sched.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdarg.h>
+
+/*
+** An instance of the following structure is passed into each worker
+** thread.
+*/
+typedef struct WorkerInfo WorkerInfo;
+struct WorkerInfo {
+  int tid;                    /* Thread ID */
+  int nWorker;                /* Total number of workers */
+  unsigned wkrFlags;          /* Flags */
+  sqlite3 *mainDb;            /* Database connection of the main thread */
+  sqlite3 *db;                /* Database connection of this thread */
+  int nErr;                   /* Number of errors seen by this thread */
+  int nTest;                  /* Number of tests run by this thread */
+  char *zMsg;                 /* Message returned by this thread */
+  pthread_t id;               /* Thread id */
+  pthread_mutex_t *pWrMutex;  /* Hold this mutex while writing */
+};
+
+/*
+** Allowed values for WorkerInfo.wkrFlags
+*/
+#define TT4_SERIALIZED    0x0000001   /* The --serialized option is used */
+#define TT4_WAL           0x0000002   /* WAL mode in use */
+#define TT4_TRACE         0x0000004   /* Trace activity */
+
+
+/*
+** Report an OOM error and die if the argument is NULL
+*/
+static void check_oom(void *x){
+  if( x==0 ){
+    fprintf(stderr, "out of memory\n");
+    exit(1);
+  }
+}
+
+/*
+** Allocate memory.  If the allocation fails, print an error message and
+** kill the process.
+*/
+static void *safe_malloc(int sz){
+  void *x = sqlite3_malloc(sz>0?sz:1);
+  check_oom(x);
+  return x;
+}
+
+/*
+** Print a trace message for a worker
+*/
+static void worker_trace(WorkerInfo *p, const char *zFormat, ...){
+  va_list ap;
+  char *zMsg;
+  if( (p->wkrFlags & TT4_TRACE)==0 ) return;
+  va_start(ap, zFormat);
+  zMsg = sqlite3_vmprintf(zFormat, ap);
+  check_oom(zMsg);
+  va_end(ap);
+  fprintf(stderr, "TRACE(%02d): %s\n", p->tid, zMsg);
+  sqlite3_free(zMsg);
+}
+
+/*
+** Prepare a single SQL query
+*/
+static sqlite3_stmt *prep_sql(sqlite3 *db, const char *zFormat, ...){
+  va_list ap;
+  char *zSql;
+  int rc;
+  sqlite3_stmt *pStmt = 0;
+
+  va_start(ap, zFormat);
+  zSql = sqlite3_vmprintf(zFormat, ap);
+  va_end(ap);
+  check_oom(zSql);
+  rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
+  if( rc!=SQLITE_OK ){
+    fprintf(stderr, "SQL error (%d,%d): %s\nWhile preparing: [%s]\n",
+            rc, sqlite3_extended_errcode(db), sqlite3_errmsg(db), zSql);
+    exit(1);
+  }
+  sqlite3_free(zSql);
+  return pStmt;
+}
+
+/*
+** Run a SQL statements.  Panic if unable.
+*/
+static void run_sql(WorkerInfo *p, const char *zFormat, ...){
+  va_list ap;
+  char *zSql;
+  int rc;
+  sqlite3_stmt *pStmt = 0;
+  int nRetry = 0;
+
+  va_start(ap, zFormat);
+  zSql = sqlite3_vmprintf(zFormat, ap);
+  va_end(ap);
+  check_oom(zSql);
+  rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
+  if( rc!=SQLITE_OK ){
+    fprintf(stderr, "SQL error (%d,%d): %s\nWhile preparing: [%s]\n",
+            rc, sqlite3_extended_errcode(p->db), sqlite3_errmsg(p->db), zSql);
+    exit(1);
+  }
+  worker_trace(p, "running [%s]", zSql);
+  while( (rc = sqlite3_step(pStmt))!=SQLITE_DONE ){
+    if( (rc&0xff)==SQLITE_BUSY || (rc&0xff)==SQLITE_LOCKED ){
+      sqlite3_reset(pStmt);
+      nRetry++;
+      if( nRetry<10 ){
+        worker_trace(p, "retry %d for [%s]", nRetry, zSql);
+        sched_yield();
+        continue;
+      }else{
+        fprintf(stderr, "Deadlock in thread %d while running [%s]\n",
+                p->tid, zSql);
+        exit(1);
+      }
+    }
+    if( rc!=SQLITE_ROW ){
+      fprintf(stderr, "SQL error (%d,%d): %s\nWhile running [%s]\n",
+              rc, sqlite3_extended_errcode(p->db), sqlite3_errmsg(p->db), zSql);
+      exit(1);
+    }
+  }
+  sqlite3_free(zSql);
+  sqlite3_finalize(pStmt);
+}
+
+
+/*
+** Open the database connection for WorkerInfo.  The order in which
+** the files are opened is a function of the tid value.
+*/
+static void worker_open_connection(WorkerInfo *p, int iCnt){
+  char *zFile;
+  int x;
+  int rc;
+  static const unsigned char aOrder[6][3] = {
+    { 1, 2, 3},
+    { 1, 3, 2},
+    { 2, 1, 3},
+    { 2, 3, 1},
+    { 3, 1, 2},
+    { 3, 2, 1}
+  };
+  x = (p->tid + iCnt) % 6;
+  zFile = sqlite3_mprintf("tt4-test%d.db", aOrder[x][0]);
+  check_oom(zFile);
+  worker_trace(p, "open %s", zFile);
+  rc = sqlite3_open_v2(zFile, &p->db,
+                       SQLITE_OPEN_READWRITE|SQLITE_OPEN_SHAREDCACHE, 0);
+  if( rc!=SQLITE_OK ){
+    fprintf(stderr, "sqlite_open_v2(%s) failed on thread %d\n",
+            zFile, p->tid);
+    exit(1);
+  }
+  sqlite3_free(zFile);
+  run_sql(p, "PRAGMA read_uncommitted=ON;");
+  sqlite3_busy_timeout(p->db, 10000);
+  run_sql(p, "PRAGMA synchronous=OFF;");
+  run_sql(p, "ATTACH 'tt4-test%d.db' AS aux1", aOrder[x][1]);
+  run_sql(p, "ATTACH 'tt4-test%d.db' AS aux2", aOrder[x][2]);
+}
+
+/*
+** Close the worker database connection
+*/
+static void worker_close_connection(WorkerInfo *p){
+  if( p->db ){
+    worker_trace(p, "close");
+    sqlite3_close(p->db);
+    p->db = 0;
+  }
+}
+
+/*
+** Delete all content in the three databases associated with a
+** single thread.  Make this happen all in a single transaction if
+** inTrans is true, or separately for each database if inTrans is
+** false.
+*/
+static void worker_delete_all_content(WorkerInfo *p, int inTrans){
+  if( inTrans ){
+    pthread_mutex_lock(p->pWrMutex);
+    run_sql(p, "BEGIN");
+    run_sql(p, "DELETE FROM t1 WHERE tid=%d", p->tid);
+    run_sql(p, "DELETE FROM t2 WHERE tid=%d", p->tid);
+    run_sql(p, "DELETE FROM t3 WHERE tid=%d", p->tid);
+    run_sql(p, "COMMIT");
+    pthread_mutex_unlock(p->pWrMutex);
+    p->nTest++;
+  }else{
+    pthread_mutex_lock(p->pWrMutex);
+    run_sql(p, "DELETE FROM t1 WHERE tid=%d", p->tid);
+    pthread_mutex_unlock(p->pWrMutex);
+    p->nTest++;
+    pthread_mutex_lock(p->pWrMutex);
+    run_sql(p, "DELETE FROM t2 WHERE tid=%d", p->tid);
+    pthread_mutex_unlock(p->pWrMutex);
+    p->nTest++;
+    pthread_mutex_lock(p->pWrMutex);
+    run_sql(p, "DELETE FROM t3 WHERE tid=%d", p->tid);
+    pthread_mutex_unlock(p->pWrMutex);
+    p->nTest++;
+  }
+}
+
+/*
+** Create rows mn through mx in table iTab for the given worker
+*/
+static void worker_add_content(WorkerInfo *p, int mn, int mx, int iTab){
+  char *zTabDef;
+  switch( iTab ){
+    case 1:  zTabDef = "t1(tid,sp,a,b,c)";  break;
+    case 2:  zTabDef = "t2(tid,sp,d,e,f)";  break;
+    case 3:  zTabDef = "t3(tid,sp,x,y,z)";  break;
+  }
+  pthread_mutex_lock(p->pWrMutex);
+  run_sql(p, 
+     "WITH RECURSIVE\n"
+     " c(i) AS (VALUES(%d) UNION ALL SELECT i+1 FROM c WHERE i<%d)\n"
+     "INSERT INTO %s SELECT %d, zeroblob(3000), i, printf('%%d',i), i FROM c;",
+     mn, mx, zTabDef, p->tid
+  );
+  pthread_mutex_unlock(p->pWrMutex);
+  p->nTest++;
+}
+
+/*
+** Set an error message on a worker
+*/
+static void worker_error(WorkerInfo *p, const char *zFormat, ...){
+  va_list ap;
+  p->nErr++;
+  sqlite3_free(p->zMsg);
+  va_start(ap, zFormat);
+  p->zMsg = sqlite3_vmprintf(zFormat, ap);
+  va_end(ap);
+}
+
+/*
+** Each thread runs the following function.
+*/
+static void *worker_thread(void *pArg){
+  WorkerInfo *p = (WorkerInfo*)pArg;
+  int iOuter;
+  int i;
+  int rc;
+  sqlite3_stmt *pStmt;
+
+  printf("worker %d startup\n", p->tid);  fflush(stdout);
+  for(iOuter=1; iOuter<=p->nWorker; iOuter++){
+    worker_open_connection(p, iOuter);
+    for(i=0; i<4; i++){
+      worker_add_content(p, i*100+1, (i+1)*100, (p->tid+iOuter)%3 + 1);
+      worker_add_content(p, i*100+1, (i+1)*100, (p->tid+iOuter+1)%3 + 1);
+      worker_add_content(p, i*100+1, (i+1)*100, (p->tid+iOuter+2)%3 + 1);
+    }
+
+    pStmt = prep_sql(p->db, "SELECT count(a) FROM t1 WHERE tid=%d", p->tid);
+    worker_trace(p, "query [%s]", sqlite3_sql(pStmt));
+    rc = sqlite3_step(pStmt);
+    if( rc!=SQLITE_ROW ){
+      worker_error(p, "Failed to step: %s", sqlite3_sql(pStmt));
+    }else if( sqlite3_column_int(pStmt, 0)!=400 ){
+      worker_error(p, "Wrong result: %d", sqlite3_column_int(pStmt,0));
+    }
+    sqlite3_finalize(pStmt);
+    if( p->nErr ) break;
+
+    if( ((iOuter+p->tid)%3)==0 ){
+      sqlite3_db_release_memory(p->db);
+      p->nTest++;
+    }
+
+    pthread_mutex_lock(p->pWrMutex);
+    run_sql(p, "BEGIN;");
+    run_sql(p, "UPDATE t1 SET c=NULL WHERE a=55");
+    run_sql(p, "UPDATE t2 SET f=NULL WHERE d=42");
+    run_sql(p, "UPDATE t3 SET z=NULL WHERE x=31");
+    run_sql(p, "ROLLBACK;");
+    p->nTest++;
+    pthread_mutex_unlock(p->pWrMutex);
+
+
+    if( iOuter==p->tid ){
+      pthread_mutex_lock(p->pWrMutex);
+      run_sql(p, "VACUUM");
+      pthread_mutex_unlock(p->pWrMutex);
+    }
+
+    pStmt = prep_sql(p->db,
+       "SELECT t1.rowid, t2.rowid, t3.rowid"
+       "  FROM t1, t2, t3"
+       " WHERE t1.tid=%d AND t2.tid=%d AND t3.tid=%d"
+       "   AND t1.a<>t2.d AND t2.d<>t3.x"
+       " ORDER BY 1, 2, 3"
+       ,p->tid, p->tid, p->tid);
+    worker_trace(p, "query [%s]", sqlite3_sql(pStmt));
+    for(i=0; i<p->nWorker; i++){
+      rc = sqlite3_step(pStmt);
+      if( rc!=SQLITE_ROW ){
+        worker_error(p, "Failed to step: %s", sqlite3_sql(pStmt));
+        break;
+      }
+      sched_yield();
+    }
+    sqlite3_finalize(pStmt);
+    if( p->nErr ) break;
+
+    worker_delete_all_content(p, (p->tid+iOuter)%2);
+    worker_close_connection(p);
+    p->db = 0;
+  }
+  worker_close_connection(p);
+  printf("worker %d finished\n", p->tid); fflush(stdout);
+  return 0;
+}
+
+int main(int argc, char **argv){
+  int nWorker = 0;         /* Number of worker threads */
+  int i;                   /* Loop counter */
+  WorkerInfo *aInfo;       /* Information for each worker */
+  unsigned wkrFlags = 0;   /* Default worker flags */
+  int nErr = 0;            /* Number of errors */
+  int nTest = 0;           /* Number of tests */
+  int rc;                  /* Return code */
+  sqlite3 *db = 0;         /* Main database connection */
+  pthread_mutex_t wrMutex; /* The write serialization mutex */
+  WorkerInfo infoTop;      /* WorkerInfo for the main thread */
+  WorkerInfo *p;           /* Pointer to infoTop */
+
+  sqlite3_config(SQLITE_CONFIG_MULTITHREAD);
+  for(i=1; i<argc; i++){
+    const char *z = argv[i];
+    if( z[0]=='-' ){
+      if( z[1]=='-' && z[2]!=0 ) z++;
+      if( strcmp(z,"-multithread")==0 ){
+        sqlite3_config(SQLITE_CONFIG_MULTITHREAD);
+        wkrFlags &= ~TT4_SERIALIZED;
+      }else if( strcmp(z,"-serialized")==0 ){
+        sqlite3_config(SQLITE_CONFIG_SERIALIZED);
+        wkrFlags |= TT4_SERIALIZED;
+      }else if( strcmp(z,"-wal")==0 ){
+        wkrFlags |= TT4_WAL;
+      }else if( strcmp(z,"-trace")==0 ){
+        wkrFlags |= TT4_TRACE;
+      }else{
+        fprintf(stderr, "unknown command-line option: %s\n", argv[i]);
+        exit(1);
+      }
+    }else if( z[0]>='1' && z[0]<='9' && nWorker==0 ){
+      nWorker = atoi(z);
+      if( nWorker<2 ){
+        fprintf(stderr, "minimum of 2 threads\n");
+        exit(1);
+      }
+    }else{
+      fprintf(stderr, "extra command-line argument: \"%s\"\n", argv[i]);
+      exit(1);
+    }
+  }
+  if( nWorker==0 ){ 
+    fprintf(stderr,
+       "usage:  %s ?OPTIONS? N\n"
+       "N is the number of threads and must be at least 2.\n"
+       "Options:\n"
+       "  --serialized\n"
+       "  --multithread\n"
+       "  --wal\n"
+       "  --trace\n"
+       ,argv[0]
+    );
+    exit(1);
+  }
+  if( !sqlite3_threadsafe() ){
+    fprintf(stderr, "requires a threadsafe build of SQLite\n");
+    exit(1);
+  }
+  sqlite3_initialize();
+  sqlite3_enable_shared_cache(1);
+  pthread_mutex_init(&wrMutex, 0);
+
+  /* Initialize the test database files */
+  (void)unlink("tt4-test1.db");
+  (void)unlink("tt4-test2.db");
+  (void)unlink("tt4-test3.db");
+  rc = sqlite3_open("tt4-test1.db", &db);
+  if( rc!=SQLITE_OK ){
+    fprintf(stderr, "Unable to open test database: tt4-test2.db\n");
+    exit(1);
+  }
+  memset(&infoTop, 0, sizeof(infoTop));
+  infoTop.db = db;
+  infoTop.wkrFlags = wkrFlags;
+  p = &infoTop;
+  if( wkrFlags & TT4_WAL ){
+    run_sql(p, "PRAGMA journal_mode=WAL");
+  }
+  run_sql(p, "PRAGMA synchronous=OFF");
+  run_sql(p, "CREATE TABLE IF NOT EXISTS t1(tid INTEGER, sp, a, b, c)");
+  run_sql(p, "CREATE INDEX t1tid ON t1(tid)");
+  run_sql(p, "CREATE INDEX t1ab ON t1(a,b)");
+  run_sql(p, "ATTACH 'tt4-test2.db' AS 'test2'");
+  run_sql(p, "CREATE TABLE IF NOT EXISTS test2.t2(tid INTEGER, sp, d, e, f)");
+  run_sql(p, "CREATE INDEX test2.t2tid ON t2(tid)");
+  run_sql(p, "CREATE INDEX test2.t2de ON t2(d,e)");
+  run_sql(p, "ATTACH 'tt4-test3.db' AS 'test3'");
+  run_sql(p, "CREATE TABLE IF NOT EXISTS test3.t3(tid INTEGER, sp, x, y, z)");
+  run_sql(p, "CREATE INDEX test3.t3tid ON t3(tid)");
+  run_sql(p, "CREATE INDEX test3.t3xy ON t3(x,y)");
+  aInfo = safe_malloc( sizeof(*aInfo)*nWorker );
+  memset(aInfo, 0, sizeof(*aInfo)*nWorker);
+  for(i=0; i<nWorker; i++){
+    aInfo[i].tid = i+1;
+    aInfo[i].nWorker = nWorker;
+    aInfo[i].wkrFlags = wkrFlags;
+    aInfo[i].mainDb = db;
+    aInfo[i].pWrMutex = &wrMutex;
+    rc = pthread_create(&aInfo[i].id, 0, worker_thread, &aInfo[i]);
+    if( rc!=0 ){
+      fprintf(stderr, "thread creation failed for thread %d\n", i+1);
+      exit(1);
+    }
+    sched_yield();
+  }
+  for(i=0; i<nWorker; i++){
+    pthread_join(aInfo[i].id, 0);
+    printf("Joined thread %d: %d errors in %d tests",
+           aInfo[i].tid, aInfo[i].nErr, aInfo[i].nTest);
+    if( aInfo[i].zMsg ){
+      printf(": %s\n", aInfo[i].zMsg);
+    }else{
+      printf("\n");
+    }
+    nErr += aInfo[i].nErr;
+    nTest += aInfo[i].nTest;
+    fflush(stdout);
+  }
+  sqlite3_close(db);
+  sqlite3_free(aInfo);
+  printf("Total %d errors in %d tests\n", nErr, nTest);
+  return nErr;
+}