mirror of
https://github.com/tursodatabase/libsql.git
synced 2024-12-15 15:39:52 +00:00
340 lines
8.1 KiB
C
340 lines
8.1 KiB
C
/*
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** 2021-05-12
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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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**
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** Testing threading behavior when multiple database connections in separate
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** threads of the same process are all talking to the same database file.
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**
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** For best results, ensure that SQLite is compiled with HAVE_USLEEP=1
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**
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** Only works on unix platforms.
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**
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** Usage:
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**
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** ./threadtest5 ?DATABASE?
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**
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** If DATABASE is omitted, it defaults to using file:/mem?vfs=memdb.
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*/
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#include "sqlite3.h"
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#include <pthread.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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/* Name of the in-memory database */
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static char *zDbName = 0;
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/* True for debugging */
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static int eVerbose = 0;
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/* If rc is not SQLITE_OK, then print an error message and stop
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** the test.
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*/
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static void error_out(int rc, const char *zCtx, int lineno){
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if( rc!=SQLITE_OK ){
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fprintf(stderr, "error %d at %d in \"%s\"\n", rc, lineno, zCtx);
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exit(-1);
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}
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}
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#if 0
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/* Return the number of milliseconds since the Julian epoch (-4714-11-24).
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*/
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static sqlite3_int64 gettime(void){
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sqlite3_int64 tm;
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sqlite3_vfs *pVfs = sqlite3_vfs_find(0);
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pVfs->xCurrentTimeInt64(pVfs, &tm);
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return tm;
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}
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#endif
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/* Run the SQL in the second argument.
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*/
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static int exec(
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sqlite3 *db,
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const char *zId,
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int lineno,
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const char *zFormat,
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...
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){
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int rc;
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va_list ap;
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char *zSql;
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va_start(ap, zFormat);
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zSql = sqlite3_vmprintf(zFormat, ap);
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va_end(ap);
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if( eVerbose){
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printf("%s:%d: [%s]\n", zId, lineno, zSql);
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fflush(stdout);
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}
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rc = sqlite3_exec(db, zSql, 0, 0, 0);
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if( rc && eVerbose ){
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printf("%s:%d: return-code %d\n", zId, lineno, rc);
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fflush(stdout);
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}
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sqlite3_free(zSql);
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return rc;
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}
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/* Generate a perpared statement from the input SQL
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*/
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static sqlite3_stmt *prepare(
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sqlite3 *db,
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const char *zId,
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int lineno,
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const char *zFormat,
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...
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){
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int rc;
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va_list ap;
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char *zSql;
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sqlite3_stmt *pStmt = 0;
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va_start(ap, zFormat);
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zSql = sqlite3_vmprintf(zFormat, ap);
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va_end(ap);
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if( eVerbose){
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printf("%s:%d: [%s]\n", zId, lineno, zSql);
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fflush(stdout);
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}
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rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0);
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if( rc ){
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printf("%s:%d: ERROR - %s\n", zId, lineno, sqlite3_errmsg(db));
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exit(-1);
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}
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sqlite3_free(zSql);
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return pStmt;
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}
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/*
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** Wait for table zTable to exist in the schema.
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*/
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static void waitOnTable(sqlite3 *db, const char *zWorker, const char *zTable){
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while(1){
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int eFound = 0;
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sqlite3_stmt *q = prepare(db, zWorker, __LINE__,
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"SELECT 1 FROM sqlite_schema WHERE name=%Q", zTable);
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if( sqlite3_step(q)==SQLITE_ROW && sqlite3_column_int(q,0)!=0 ){
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eFound = 1;
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}
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sqlite3_finalize(q);
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if( eFound ) return;
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sqlite3_sleep(1);
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}
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}
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/*
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** Return true if x is a prime number
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*/
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static int isPrime(int x){
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int i;
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if( x<2 ) return 1;
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for(i=2; i*i<=x; i++){
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if( (x%i)==0 ) return 0;
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}
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return 1;
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}
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/* Each worker thread runs an instance of the following */
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static void *worker(void *pArg){
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int rc;
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const char *zName = (const char*)pArg;
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sqlite3 *db = 0;
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if( eVerbose ){
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printf("%s: startup\n", zName);
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fflush(stdout);
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}
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rc = sqlite3_open(zDbName, &db);
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error_out(rc, "sqlite3_open", __LINE__);
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sqlite3_busy_timeout(db, 2000);
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while( 1 ){
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sqlite3_stmt *q1;
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int tid = -1;
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q1 = prepare(db, zName, __LINE__,
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"UPDATE task SET doneby=%Q"
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" WHERE tid=(SELECT tid FROM task WHERE doneby IS NULL LIMIT 1)"
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"RETURNING tid", zName
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);
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if( sqlite3_step(q1)==SQLITE_ROW ){
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tid = sqlite3_column_int(q1,0);
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}
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sqlite3_finalize(q1);
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if( tid<0 ) break;
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if( eVerbose ){
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printf("%s: starting task %d\n", zName, tid);
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fflush(stdout);
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}
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if( tid==1 ){
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exec(db, zName, __LINE__,
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"CREATE TABLE IF NOT EXISTS p1(x INTEGER PRIMARY KEY);"
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);
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}else if( tid>=2 && tid<=51 ){
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int a, b, i;
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waitOnTable(db, zName, "p1");
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a = (tid-2)*200 + 1;
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b = a+200;
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for(i=a; i<b; i++){
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if( isPrime(i) ){
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exec(db, zName, __LINE__,
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"INSERT INTO p1(x) VALUES(%d)", i);
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}
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}
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}else if( tid==52 ){
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exec(db, zName, __LINE__,
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"CREATE TABLE IF NOT EXISTS p2(x INTEGER PRIMARY KEY);"
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"WITH RECURSIVE"
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" c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<10000)"
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"INSERT INTO p2(x) SELECT x FROM c;"
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);
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}else if( tid>=53 && tid<=62 ){
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int a, b, i;
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waitOnTable(db, zName, "p2");
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a = (tid-53)*10 + 2;
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b = a+9;
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for(i=a; i<=b; i++){
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exec(db, zName, __LINE__,
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"DELETE FROM p2 WHERE x>%d AND (x %% %d)==0", i, i);
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}
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}
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if( eVerbose ){
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printf("%s: completed task %d\n", zName, tid);
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fflush(stdout);
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}
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sqlite3_sleep(1);
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}
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sqlite3_close(db);
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if( eVerbose ){
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printf("%s: exit\n", zName);
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fflush(stdout);
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}
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return 0;
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}
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/* Print a usage comment and die */
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static void usage(const char *argv0){
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printf("Usage: %s [options]\n", argv0);
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printf(
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" -num-workers N Run N worker threads\n"
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" -v Debugging output\n"
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);
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exit(1);
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}
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/* Maximum number of threads */
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#define MX_WORKER 100
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/*
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** Main routine
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*/
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int main(int argc, char **argv){
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int i;
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int nWorker = 4;
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int rc;
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sqlite3 *db = 0;
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sqlite3_stmt *q;
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pthread_t aWorker[MX_WORKER];
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char aWorkerName[MX_WORKER][8];
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for(i=1; i<argc; i++){
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const char *zArg = argv[i];
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if( zArg[0]!='-' ){
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if( zDbName==0 ){
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zDbName = argv[i];
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continue;
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}
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printf("unknown argument: %s\n", zArg);
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usage(argv[0]);
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}
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if( zArg[1]=='-' ) zArg++;
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if( strcmp(zArg, "-v")==0 ){
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eVerbose = 1;
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continue;
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}
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if( strcmp(zArg, "-num-workers")==0 && i+1<argc ){
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nWorker = atoi(argv[++i]);
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if( nWorker<1 || nWorker>MX_WORKER ){
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printf("number of threads must be between 1 and %d\n", MX_WORKER);
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exit(1);
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}
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continue;
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}
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printf("unknown option: %s\n", argv[i]);
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usage(argv[0]);
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}
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if( zDbName==0 ) zDbName = "file:/mem?vfs=memdb";
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sqlite3_config(SQLITE_CONFIG_URI, (int)1);
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rc = sqlite3_open(zDbName, &db);
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error_out(rc, "sqlite3_open", __LINE__);
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rc = exec(db, "SETUP", __LINE__,
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"DROP TABLE IF EXISTS task;\n"
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"DROP TABLE IF EXISTS p1;\n"
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"DROP TABLE IF EXISTS p2;\n"
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"DROP TABLE IF EXISTS verify;\n"
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"CREATE TABLE IF NOT EXISTS task(\n"
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" tid INTEGER PRIMARY KEY,\n"
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" doneby TEXT\n"
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");\n"
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"WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<100)"
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"INSERT INTO task(tid) SELECT x FROM c;\n"
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);
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error_out(rc, "sqlite3_exec", __LINE__);
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for(i=0; i<nWorker; i++){
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sqlite3_snprintf(sizeof(aWorkerName[i]), aWorkerName[i],
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"W%02d", i);
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pthread_create(&aWorker[i], 0, worker, aWorkerName[i]);
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}
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for(i=0; i<nWorker; i++){
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pthread_join(aWorker[i], 0);
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}
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for(i=0; i<nWorker; i++){
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q = prepare(db, "MAIN", __LINE__,
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"SELECT group_concat(tid,',') FROM task WHERE doneby=%Q",
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aWorkerName[i]);
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if( sqlite3_step(q)==SQLITE_ROW ){
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printf("%s: %s\n", aWorkerName[i], sqlite3_column_text(q,0));
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}
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sqlite3_finalize(q);
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}
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q = prepare(db, "MAIN", __LINE__, "SELECT count(*) FROM p2");
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if( sqlite3_step(q)!=SQLITE_ROW || sqlite3_column_int(q,0)<10 ){
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printf("incorrect result\n");
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exit(-1);
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}
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sqlite3_finalize(q);
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q = prepare(db, "MAIN", __LINE__, "SELECT x FROM p1 EXCEPT SELECT x FROM p2");
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if( sqlite3_step(q)==SQLITE_ROW ){
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printf("incorrect result\n");
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exit(-1);
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}
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sqlite3_finalize(q);
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q = prepare(db, "MAIN", __LINE__, "SELECT x FROM p2 EXCEPT SELECT x FROM p1");
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if( sqlite3_step(q)==SQLITE_ROW ){
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printf("incorrect result\n");
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exit(-1);
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}
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sqlite3_finalize(q);
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printf("OK\n");
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sqlite3_close(db);
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return 0;
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}
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