Getting global variable in a multithreaded PHP embedded application View as Markdown

At 10.25 05/01/2007, you wrote:

Hi All,

I'm just new to php embed application but I'm at good point
after some work/fighting with the engine API. My intention is
to run different php scripts in a multithreaded application at the
same time. Furthermore I don't need to make some php
intercomunications and/or parallel script exection. So, the approch
I follow, for embedding the PHP in to my application, is the usual
(I guess ;-) sapi with some other hints from the plpgsql, PHP-Interpreter
source codes. So I initialize the php engine with:

int initEngine( void )
{
zend_compiler_globals *compiler_globals;
zend_executor_globals *executor_globals;
php_core_globals *core_globals;
sapi_globals_struct *sapi_globals;
void ***tsrm_ls;

if ( ze_started == true )
{
return 0;
}

if ( !tsrm_startup( 128, 32, TSRM_ERROR_LEVEL_CORE, "/tmp/TSRM.log") )
{
ANY_LOG( 0, "Unable to init the PHP TSRM!", ANY_LOG_FATAL );
return -1;
}

/* get some globals from the PHP engine */
compiler_globals = ts_resource( compiler_globals_id );
executor_globals = ts_resource( executor_globals_id );
core_globals = ts_resource( core_globals_id );
sapi_globals = ts_resource( sapi_globals_id );
tsrm_ls = ts_resource( 0 );

HSI_sapi.php_ini_path_override = "/etc/php.ini";

sapi_startup( &HSI_sapi );

ze_started = true;

if ( php_module_startup( &HSI_sapi, NULL, 0 ) == FAILURE )
{
ANY_LOG( 0, "Failed to initialize PHP", ANY_LOG_FATAL );
return -1;
}
}

while each context is allocated by the follow:

void *createInterpreter( void )
{
void *interp = NULL;
void *prev_interp = NULL;

interp = tsrm_new_interpreter_context();

prev_interp = tsrm_set_interpreter_context( interp );
{
TSRMLS_FETCH();

zend_alter_ini_entry("register_argc_argv", 19, "0", 1,
PHP_INI_SYSTEM, PHP_INI_STAGE_ACTIVATE);
zend_alter_ini_entry("html_errors", 12, "0", 1, PHP_INI_SYSTEM,
PHP_INI_STAGE_ACTIVATE);
zend_alter_ini_entry("implicit_flush", 15, "1", 1, PHP_INI_SYSTEM,
PHP_INI_STAGE_ACTIVATE);
zend_alter_ini_entry("max_execution_time", 19, "0", 1,
PHP_INI_SYSTEM, PHP_INI_STAGE_ACTIVATE);

SG( headers_sent ) = 1;
SG( request_info ).no_headers = 1;
SG( options ) = SAPI_OPTION_NO_CHDIR;

php_request_startup( TSRMLS_C );

PG( during_request_startup ) = 0;

tsrm_set_interpreter_context( prev_interp );
}

return( interp );
}

my scripts are evalutated with:

bool phpEval( void *interp, char *cmd, zval *zv )
{
bool retVal = true;
void *prev_interp = NULL;

prev_interp = tsrm_set_interpreter_context( interp );
{
TSRMLS_FETCH();

zend_try
{
if ( zend_eval_string( cmd, zv, "PHP Embedded Interface"
TSRMLS_CC ) == FAILURE )
{
fprintf( stderr, "Unable to send the command '%s' on Php", cmd );
retVal = false;
goto out;
}
}
zend_catch
{
fprintf( stderr, "Unable to send the command '%s' on Php", cmd );
retVal = false;
goto out;
}
zend_end_try()
{
}
}

out:
tsrm_set_interpreter_context( prev_interp );

return( retVal );
}

so now the question is, since I execute each php script in a different context
how can I get global variables from it? I tried to use the code below
but it doesn't
work. Obviously the zend_hash_find( &EG(symbol_table) ... ) works great in a
"standard" application using the macros PHP_EMBED_START/END_BLOCK(argc,argv):

zval **data = NULL;
HashTable *arrayHash = NULL;
void *prev_interp = NULL;

prev_interp = tsrm_set_interpreter_context( self->interp );
{
TSRMLS_FETCH();

if ( zend_hash_find( &EG(symbol_table), "myVar", sizeof( "myVar"
), (void **)&data) == FAILURE )
{
fprintf( stderr, "The infoString array myVar not found in $GLOBALS" );
goto out;
}

if ( data == NULL )
{
fprintf( stderr, "myVar doesn't contains any data" );
goto out;
}
}

out:
tsrm_set_interpreter_context( prev_interp );

I guess that the EG(symbol_table) isn't correct here but I don't find
any place
where to clarify how to get global variables from a given context.
Does anyone can
explain me how to do it?

I found the solution myself :-))!! Basically using the active_symbol_table instead of
the symbol_table and adding +1 to the sizeof(), I solved the problem :-))!!!

zval **data = NULL;
HashTable *arrayHash = NULL;
void *prev_interp = NULL;

prev_interp = tsrm_set_interpreter_context( self->interp );
{
TSRMLS_FETCH();

if ( zend_hash_find( EG(active_symbol_table), "myVar", sizeof( "myVar" )+1, (void **)&data) == FAILURE )
{
  fprintf( stderr, "The infoString array myVar not found in $GLOBALS" );
  goto out;
}

if ( data == `NULL` )
{
  fprintf( stderr, "myVar doesn't contains any data" );
  goto out;
}

}

out:
tsrm_set_interpreter_context( prev_interp );

Now my problem is how to find declared functions in a context. Which hash table
I have to use?

Thanks in advance.

Roberto Fichera.

--

Roberto Fichera.