134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/*
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** 2004 January 13
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** This file implements a simple standalone program used to test whether
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** or not the SQLite library is threadsafe.
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**
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** This file is NOT part of the standard SQLite library. It is used for
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** testing only.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <string.h>
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#include <stdlib.h>
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#include "sqlite.h"
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/*
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** Name of the database
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*/
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#define DB_FILE "test.db"
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/*
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** When this variable becomes non-zero, all threads stop
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** what they are doing.
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*/
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volatile int all_stop = 0;
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/*
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** Callback from the integrity check. If the result is anything other
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** than "ok" it means the integrity check has failed. Set the "all_stop"
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** global variable to stop all other activity. Print the error message
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** or print OK if the string "ok" is seen.
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*/
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int check_callback(void *pid, int argc, char **argv, char **notUsed2){
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int id = (int)pid;
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if( strcmp(argv[0],"ok") ){
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all_stop = 1;
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fprintf(stderr,"%d: %s\n", id, argv[0]);
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}else{
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/* fprintf(stderr,"%d: OK\n", id); */
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}
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return 0;
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}
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/*
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** Do an integrity check on the database. If the first integrity check
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** fails, try it a second time.
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*/
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int integrity_check(sqlite *db, int id){
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int rc;
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if( all_stop ) return 0;
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/* fprintf(stderr,"%d: CHECK\n", id); */
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rc = sqlite3_exec(db, "pragma integrity_check", check_callback, 0, 0);
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if( rc!=SQLITE_OK && rc!=SQLITE_BUSY ){
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fprintf(stderr,"%d, Integrity check returns %d\n", id, rc);
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}
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if( all_stop ){
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sqlite3_exec(db, "pragma integrity_check", check_callback, 0, 0);
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}
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return 0;
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}
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/*
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** This is the worker thread
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*/
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void *worker(void *workerArg){
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sqlite *db;
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int id = (int)workerArg;
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int rc;
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int cnt = 0;
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fprintf(stderr, "Starting worker %d\n", id);
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while( !all_stop && cnt++<10000 ){
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if( cnt%100==0 ) printf("%d: %d\n", id, cnt);
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while( (sqlite3_open(DB_FILE, &db))!=SQLITE_OK ) sched_yield();
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sqlite3_exec(db, "PRAGMA synchronous=OFF", 0, 0, 0);
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/* integrity_check(db, id); */
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if( all_stop ){ sqlite3_close(db); break; }
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/* fprintf(stderr, "%d: BEGIN\n", id); */
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rc = sqlite3_exec(db, "INSERT INTO t1 VALUES('bogus data')", 0, 0, 0);
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/* fprintf(stderr, "%d: END rc=%d\n", id, rc); */
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sqlite3_close(db);
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}
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fprintf(stderr, "Worker %d finished\n", id);
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return 0;
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}
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/*
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** Initialize the database and start the threads
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*/
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int main(int argc, char **argv){
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sqlite *db;
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int i, rc;
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pthread_t aThread[5];
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if( strcmp(DB_FILE,":memory:") ){
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char *zJournal = sqlite3_mprintf("%s-journal", DB_FILE);
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unlink(DB_FILE);
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unlink(zJournal);
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sqlite3_free(zJournal);
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}
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sqlite3_open(DB_FILE, &db);
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if( db==0 ){
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fprintf(stderr,"unable to initialize database\n");
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exit(1);
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}
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rc = sqlite3_exec(db, "CREATE TABLE t1(x);", 0,0,0);
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if( rc ){
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fprintf(stderr,"cannot create table t1: %d\n", rc);
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exit(1);
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}
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sqlite3_close(db);
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for(i=0; i<sizeof(aThread)/sizeof(aThread[0]); i++){
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pthread_create(&aThread[i], 0, worker, (void*)i);
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}
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for(i=0; i<sizeof(aThread)/sizeof(aThread[i]); i++){
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pthread_join(aThread[i], 0);
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}
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if( !all_stop ){
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printf("Everything seems ok.\n");
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return 0;
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}else{
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printf("We hit an error.\n");
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return 1;
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}
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}
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