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