Re: Re: How do I save TSRMLS_CACHE for a new thread in PHP7?

On Wed, 25 Nov 2015 22:45:29 +0100 Ángel González <keisial@gmail.com> wrote: > On 25/11/15 20:25, Ruslan Osmanov wrote: > > I'll try to explain the problem. > > > > I have a function(let's call it execF), which is > > passed to a > > library(libeio) as a callback. This function is invoked afterwards > > by the library in separate thread. > > > > The function is calling Zend API, particularly ZVAL_STRINGL(). The > > Zend API uses TSRMLS_CACHE internally. For instance, ZVAL_STRINGL() > > allocates zend_string which implies using AG() macro. The AG() macro > > relies on TSRMLS_CACHE. > > > > Since TSRMLS_CACHE becomes invalid in new thread, the AG() macro (as > > well as other macros relying on TSRMLS_CACHE) fails with > > segmentation fault. > Why are you allocating a string? Are you expecting to later use it on > the php request? > What's the goal of your extension? I suspect you may have an earlier > misstep. I'm allocating a string for zend_fcall_info.function_name: https://goo.gl/MYoJcw (just like zend_call_method). Called by php_eio_custom_execute(). Well, I can pre-allocate zend_string for the callback. Then a few lines further I'm trying to fetch EG(function_table), which eventually refers to TSRMLS_CACHE. Since the latter is invalid, I catch a segmentation fault, again. So I'm asking how do I save the context for a thread created by libeio library. The flow looks like the following: 1. User passes a callable to eio_custom() 2. The callable is saved as libeio user custom data(void*): eio_custom(php_eio_custom_execute, pri, php_eio_res_cb_custom, eio_cb); 3. User calls eio_event_loop() 4. Libeio invokes php_eio_custom_execute() *in separate thread* 5. php_eio_custom_execute() unsuccessfully tries to use Zend API Thanks. -- Ruslan Osmanov

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