> Im looking at adding threading to php, (for the cgi/cli stuff)..
>
> The story so far:
>
> I've created an extension which diverts all zend_execute calls into the
> extension -> phpthreads_execute.
> this function is a copy of zend_execute with a few modifications
> - to copy & restore things like EG(active_symbol_table);
> - to malloc lock and unlock the execute loop and release on each
> opcode.
>
> I've started testing the phpthreads_create($callback); - it appears to
> work ok, execept it segfaults on completion.. - trying to reduce
> refcounts somewhere.
>
> The fireup code looks something like this..
>
> void phpthreads_create(void *ptr) {
> zval myretval;
> zval *callback = (zval *) ptr;
>
> if (!call_user_function( EG(function_table), NULL, callback,
> &myretval, 0, NULL TSRMLS_CC )) {
> zend_error(E_ERROR, "Problem Starting thread with
> callback");
> }
>
> pthread_exit(NULL);
>
>
> }
> /* {{{ proto string phpthreads_thread(string function)
> Return a string to confirm that the module is compiled in */
> PHP_FUNCTION(phpthreads_create)
> {
>
> zval *callback;
> pthread_t thread;
>
> if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z",
> &callback) == FAILURE) {
> return;
> }
> pthread_create( &thread, NULL, (void *) phpthreads_create,
> (void*) callback);
> RETURN_TRUE;
> }
>
> and the backtrace of the simple threaded test looks like this..
> 0x08128f08 in _zval_ptr_dtor (zval_ptr=0x81b5ce8) at
> /usr/src/php/php4/Zend/zend_execute_API.c:275
> 275 (*zval_ptr)->refcount--;
> (gdb) bt
> #0 0x08128f08 in _zval_ptr_dtor (zval_ptr=0x81b5ce8) at
> /usr/src/php/php4/Zend/zend_execute_API.c:275
> #1 0x424ceba2 in ?? ()
> #2 0x424c7c92 in ?? ()
> #3 0x08130588 in zend_execute_scripts (type=8, retval=0x0,
> file_count=3) at /usr/src/php/php4/Zend/zend.c:810
> #4 0x08110abd in php_execute_script (primary_file=0x40006c71) at
> /usr/src/php/php4/main/main.c:1398
> #5 0x08110138 in php_module_shutdown () at
> /usr/src/php/php4/main/main.c:1058
> #6 0x2e325f43 in ?? ()
>
> does anyone want to suggest what might be missing - is it worth putting
> this into pecl - and does someone what to lend a hand??
>
well, not until it doesn't segfault after every request, no. :)
I'd also think you'd need a quite larger subset of Pthreads, and perhaps
focus on an OO solution (like what Perl does), but that's all surrounding
elements.
Good luck with threading the Zend Engine :P
-Sterling
> regards
> alan
>
>
>
>
>
>
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