sqlite3/test/threadtest2.c

   1 /*
   2 ** 2004 January 13
   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 test whether
  13 ** or not the SQLite library is threadsafe.
  14 **
  15 ** This file is NOT part of the standard SQLite library.  It is used for
  16 ** testing only.
  17 */
  18 #include <stdio.h>
  19 #include <unistd.h>
  20 #include <pthread.h>
  21 #include <string.h>
  22 #include <stdlib.h>
  23 #include "sqlite.h"
  24
  25 /*
  26 ** Name of the database
  27 */
  28 #define DB_FILE "test.db"
  29
  30 /*
  31 ** When this variable becomes non-zero, all threads stop
  32 ** what they are doing.
  33 */
  34 volatile int all_stop = 0;
  35
  36 /*
  37 ** Callback from the integrity check.  If the result is anything other
  38 ** than "ok" it means the integrity check has failed.  Set the "all_stop"
  39 ** global variable to stop all other activity.  Print the error message
  40 ** or print OK if the string "ok" is seen.
  41 */
  42 int check_callback(void *notUsed, int argc, char **argv, char **notUsed2){
  43   if( strcmp(argv[0],"ok") ){
  44     all_stop = 1;
  45     fprintf(stderr,"pid=%d. %s\n", getpid(), argv[0]);
  46   }else{
  47     /* fprintf(stderr,"pid=%d. OK\n", getpid()); */
  48   }
  49   return 0;
  50 }
  51
  52 /*
  53 ** Do an integrity check on the database.  If the first integrity check
  54 ** fails, try it a second time.
  55 */
  56 int integrity_check(sqlite *db){
  57   int rc;
  58   if( all_stop ) return 0;
  59   /* fprintf(stderr,"pid=%d: CHECK\n", getpid()); */
  60   rc = sqlite3_exec(db, "pragma integrity_check", check_callback, 0, 0);
  61   if( rc!=SQLITE_OK && rc!=SQLITE_BUSY ){
  62     fprintf(stderr,"pid=%d, Integrity check returns %d\n", getpid(), rc);
  63   }
  64   if( all_stop ){
  65     sqlite3_exec(db, "pragma integrity_check", check_callback, 0, 0);
  66   }
  67   return 0;
  68 }
  69
  70 /*
  71 ** This is the worker thread
  72 */
  73 void *worker(void *notUsed){
  74   sqlite *db;
  75   int rc;
  76   int cnt = 0;
  77   while( !all_stop && cnt++<10000 ){
  78     if( cnt%1000==0 ) printf("pid=%d: %d\n", getpid(), cnt);
  79     while( (sqlite3_open(DB_FILE, &db))!=SQLITE_OK ) sched_yield();
  80     sqlite3_exec(db, "PRAGMA synchronous=OFF", 0, 0, 0);
  81     integrity_check(db);
  82     if( all_stop ){ sqlite3_close(db); break; }
  83     /* fprintf(stderr, "pid=%d: BEGIN\n", getpid()); */
  84     rc = sqlite3_exec(db, "INSERT INTO t1 VALUES('bogus data')", 0, 0, 0);
  85     /* fprintf(stderr, "pid=%d: END rc=%d\n", getpid(), rc); */
  86     sqlite3_close(db);
  87   }
  88   return 0;
  89 }
  90
  91 /*
  92 ** Initialize the database and start the threads
  93 */
  94 int main(int argc, char **argv){
  95   sqlite *db;
  96   int i, rc;
  97   pthread_t aThread[5];
  98
  99   if( strcmp(DB_FILE,":memory:") ){
 100     char *zJournal = sqlite3_mprintf("%s-journal", DB_FILE);
 101     unlink(DB_FILE);
 102     unlink(zJournal);
 103     free(zJournal);
 104   }
 105   sqlite3_open(DB_FILE, &db);
 106   if( db==0 ){
 107     fprintf(stderr,"unable to initialize database\n");
 108     exit(1);
 109   }
 110   rc = sqlite3_exec(db, "CREATE TABLE t1(x);", 0,0,0);
 111   if( rc ){
 112     fprintf(stderr,"cannot create table t1: %d\n", rc);
 113     exit(1);
 114   }
 115   sqlite3_close(db);
 116   for(i=0; i<sizeof(aThread)/sizeof(aThread[0]); i++){
 117     pthread_create(&aThread[i], 0, worker, 0);
 118   }
 119   for(i=0; i<sizeof(aThread)/sizeof(aThread[i]); i++){
 120     pthread_join(aThread[i], 0);
 121   }
 122   if( !all_stop ){
 123     printf("Everything seems ok.\n");
 124     return 0;
 125   }else{
 126     printf("We hit an error.\n");
 127     return 1;
 128   }
 129 }