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/*
** 2005 December 14
**
** 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 contains a binding of the asynchronous IO extension interface
** (defined in ext/async/sqlite3async.h) to Tcl.
*/
#define TCL_THREADS
#if defined(INCLUDE_SQLITE_TCL_H)
# include "sqlite_tcl.h"
#else
# include "tcl.h"
# ifndef SQLITE_TCLAPI
# define SQLITE_TCLAPI
# endif
#endif
#ifdef SQLITE_ENABLE_ASYNCIO
#include "sqlite3async.h"
#include "sqlite3.h"
#include <assert.h>
/* From main.c */
extern const char *sqlite3ErrName(int);
struct TestAsyncGlobal {
int isInstalled; /* True when async VFS is installed */
} testasync_g = { 0 };
TCL_DECLARE_MUTEX(testasync_g_writerMutex);
/*
** sqlite3async_initialize PARENT-VFS ISDEFAULT
*/
static int SQLITE_TCLAPI testAsyncInit(
void * clientData,
Tcl_Interp *interp,
int objc,
Tcl_Obj *CONST objv[]
){
const char *zParent;
int isDefault;
int rc;
if( objc!=3 ){
Tcl_WrongNumArgs(interp, 1, objv, "PARENT-VFS ISDEFAULT");
return TCL_ERROR;
}
zParent = Tcl_GetString(objv[1]);
if( !*zParent ) {
zParent = 0;
}
if( Tcl_GetBooleanFromObj(interp, objv[2], &isDefault) ){
return TCL_ERROR;
}
rc = sqlite3async_initialize(zParent, isDefault);
if( rc!=SQLITE_OK ){
Tcl_SetObjResult(interp, Tcl_NewStringObj(sqlite3ErrName(rc), -1));
return TCL_ERROR;
}
return TCL_OK;
}
/*
** sqlite3async_shutdown
*/
static int SQLITE_TCLAPI testAsyncShutdown(
void * clientData,
Tcl_Interp *interp,
int objc,
Tcl_Obj *CONST objv[]
){
sqlite3async_shutdown();
return TCL_OK;
}
static Tcl_ThreadCreateType tclWriterThread(ClientData pIsStarted){
Tcl_MutexLock(&testasync_g_writerMutex);
*((int *)pIsStarted) = 1;
sqlite3async_run();
Tcl_MutexUnlock(&testasync_g_writerMutex);
Tcl_ExitThread(0);
TCL_THREAD_CREATE_RETURN;
}
/*
** sqlite3async_start
**
** Start a new writer thread.
*/
static int SQLITE_TCLAPI testAsyncStart(
void * clientData,
Tcl_Interp *interp,
int objc,
Tcl_Obj *CONST objv[]
){
volatile int isStarted = 0;
ClientData threadData = (ClientData)&isStarted;
Tcl_ThreadId x;
const int nStack = TCL_THREAD_STACK_DEFAULT;
const int flags = TCL_THREAD_NOFLAGS;
int rc;
rc = Tcl_CreateThread(&x, tclWriterThread, threadData, nStack, flags);
if( rc!=TCL_OK ){
Tcl_AppendResult(interp, "Tcl_CreateThread() failed", 0);
return TCL_ERROR;
}
while( isStarted==0 ) { /* Busy loop */ }
return TCL_OK;
}
/*
** sqlite3async_wait
**
** Wait for the current writer thread to terminate.
**
** If the current writer thread is set to run forever then this
** command would block forever. To prevent that, an error is returned.
*/
static int SQLITE_TCLAPI testAsyncWait(
void * clientData,
Tcl_Interp *interp,
int objc,
Tcl_Obj *CONST objv[]
){
int eCond;
if( objc!=1 ){
Tcl_WrongNumArgs(interp, 1, objv, "");
return TCL_ERROR;
}
sqlite3async_control(SQLITEASYNC_GET_HALT, &eCond);
if( eCond==SQLITEASYNC_HALT_NEVER ){
Tcl_AppendResult(interp, "would block forever", (char*)0);
return TCL_ERROR;
}
Tcl_MutexLock(&testasync_g_writerMutex);
Tcl_MutexUnlock(&testasync_g_writerMutex);
return TCL_OK;
}
/*
** sqlite3async_control OPTION ?VALUE?
*/
static int SQLITE_TCLAPI testAsyncControl(
void * clientData,
Tcl_Interp *interp,
int objc,
Tcl_Obj *CONST objv[]
){
int rc = SQLITE_OK;
int aeOpt[] = { SQLITEASYNC_HALT, SQLITEASYNC_DELAY, SQLITEASYNC_LOCKFILES };
const char *azOpt[] = { "halt", "delay", "lockfiles", 0 };
const char *az[] = { "never", "now", "idle", 0 };
int iVal;
int eOpt;
if( objc!=2 && objc!=3 ){
Tcl_WrongNumArgs(interp, 1, objv, "OPTION ?VALUE?");
return TCL_ERROR;
}
if( Tcl_GetIndexFromObj(interp, objv[1], azOpt, "option", 0, &eOpt) ){
return TCL_ERROR;
}
eOpt = aeOpt[eOpt];
if( objc==3 ){
switch( eOpt ){
case SQLITEASYNC_HALT: {
assert( SQLITEASYNC_HALT_NEVER==0 );
assert( SQLITEASYNC_HALT_NOW==1 );
assert( SQLITEASYNC_HALT_IDLE==2 );
if( Tcl_GetIndexFromObj(interp, objv[2], az, "value", 0, &iVal) ){
return TCL_ERROR;
}
break;
}
case SQLITEASYNC_DELAY:
if( Tcl_GetIntFromObj(interp, objv[2], &iVal) ){
return TCL_ERROR;
}
break;
case SQLITEASYNC_LOCKFILES:
if( Tcl_GetBooleanFromObj(interp, objv[2], &iVal) ){
return TCL_ERROR;
}
break;
}
rc = sqlite3async_control(eOpt, iVal);
}
if( rc==SQLITE_OK ){
rc = sqlite3async_control(
eOpt==SQLITEASYNC_HALT ? SQLITEASYNC_GET_HALT :
eOpt==SQLITEASYNC_DELAY ? SQLITEASYNC_GET_DELAY :
SQLITEASYNC_GET_LOCKFILES, &iVal);
}
if( rc!=SQLITE_OK ){
Tcl_SetObjResult(interp, Tcl_NewStringObj(sqlite3ErrName(rc), -1));
return TCL_ERROR;
}
if( eOpt==SQLITEASYNC_HALT ){
Tcl_SetObjResult(interp, Tcl_NewStringObj(az[iVal], -1));
}else{
Tcl_SetObjResult(interp, Tcl_NewIntObj(iVal));
}
return TCL_OK;
}
#endif /* SQLITE_ENABLE_ASYNCIO */
/*
** This routine registers the custom TCL commands defined in this
** module. This should be the only procedure visible from outside
** of this module.
*/
int Sqlitetestasync_Init(Tcl_Interp *interp){
#ifdef SQLITE_ENABLE_ASYNCIO
Tcl_CreateObjCommand(interp,"sqlite3async_start",testAsyncStart,0,0);
Tcl_CreateObjCommand(interp,"sqlite3async_wait",testAsyncWait,0,0);
Tcl_CreateObjCommand(interp,"sqlite3async_control",testAsyncControl,0,0);
Tcl_CreateObjCommand(interp,"sqlite3async_initialize",testAsyncInit,0,0);
Tcl_CreateObjCommand(interp,"sqlite3async_shutdown",testAsyncShutdown,0,0);
#endif /* SQLITE_ENABLE_ASYNCIO */
return TCL_OK;
}
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