To make the discussion more detailed, please allow me to offer my 
implementation of use land coroutine(Fiber).

https://github.com/php/php-src/compare/master...fiberphp:fiber-ext?expand=1


> On 1 Nov 2017, at 17:32, Haitao Lv <i...@lvht.net> wrote:
> 
> Suppose we have a internal Coroutine class and it has a resume() method.
> 
> In order to resume the coroutine, we have to call the resume() function.
> 
> As the resume function is a internal method defined in c, we need call
> 
> zend_execute_ex(backuped_execute_data)
> 
> to resume the zend execution.
> 
> If we need to pause the coroutine, we set the EG(vm_interrupt) and 
> interrupt_function,
> and switch the execute data and stack. The zend vm will execute the old 
> online.
> 
> However, we will never see the resume() method returned and never get its 
> return value.
> 
>> On 1 Nov 2017, at 17:14, Dmitry Stogov <dmi...@zend.com> wrote:
>> 
>> after zend_interrupt_function() callback VM continues execution using 
>> EG(current_execute_data).
>> callback may modify it in any way (e.g. unwind stack, or switch to another 
>> co-routine or continuation).
>> 
>> Thanks. Dmitry.
>> From: Haitao Lv <i...@lvht.net>
>> Sent: Wednesday, November 1, 2017 11:54:54 AM
>> To: Dmitry Stogov
>> Cc: PHP Internals
>> Subject: Re: [PHP-DEV] RFC - Zend VM Pause API 
>> 
>> It seems that set EG(vm_interrupt) to 1 could not stop the vm execution but 
>> only execute the interrupt_function and continue the current execution.
>> 
>> However, my RFC propose to stop the current execution.
>> 
>>> On 1 Nov 2017, at 16:07, Dmitry Stogov <dmi...@zend.com> wrote:
>>> 
>>> Hi,
>>> 
>>> It should be possible do similar things using EG(vm_interrupt) and 
>>> zend_interrupt_function() callback (introduced in php-7.1)
>>> ext/pcntl implements asynchronous signal handling using this.
>>> 
>>> Thanks. Dmitry.
>>> From: Haitao Lv <i...@lvht.net>
>>> Sent: Wednesday, November 1, 2017 4:19:07 AM
>>> To: PHP Internals
>>> Subject: [PHP-DEV] RFC - Zend VM Pause API 
>>> 
>>> Hi, internals,
>>> 
>>> I propose to introduce a new zend vm pause api, and here is the RPF
>>> 
>>> https://wiki.php.net/rfc/zend-vm-pause-api
>>> 
>>> Please gave your comment.
>>> 
>>> Thank you.
>>> 
>>> 
>>> 
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>> 
>> 
> 
> 
> 
> 
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