Re: GraphicsMagick may collapse when binding into a server

I've tried both two solution.
One is:

#include <magick/api.h>
>
> static int GMCmd(int argc, char **argv) {
>     int status;
>     status = GMCommand(argc, argv);
>     return status;
> }
>
> static void init() {
>     InitializeMagick(NULL);
> }
>
and let server call init() when it starts.

The other is:

static int GMCmd(int argc, char **argv) {
>     int status;
>
    InitializeMagick(*argv);
>
    status = GMCommand(argc, argv);
>     return status;
> }
>

Then I run a pressure test code to request the server and after a while it
still broke down with message:

> magick/semaphore.c:531: LockSemaphoreInfo: Assertion `semaphore_info !=
> (SemaphoreInfo *) ((void *)0)' failed.
>



On Mon, May 20, 2013 at 11:08 AM, Feng Liyuan <[email protected]>wrote:

> Thanks for your help.
>
> If I want to `invoking InitializeMagick() once`, did it mean
> `InitializeMagick(NULL)` because I canot find `InitializeMagick()`?
>
>
> On Fri, May 17, 2013 at 10:12 PM, Bob Friesenhahn <
> [email protected]> wrote:
>
>> On Fri, 17 May 2013, Feng Liyuan wrote:
>>
>>  I bind these code into a golang server to deal with images.
>>>
>>>       #cgo pkg-config: GraphicsMagick
>>>
>>>       #include <magick/api.h>
>>>
>>>       static int GMCmd(int argc, char **argv) {
>>>           int status;
>>>           status = GMCommand(argc, argv);
>>>           return status;
>>>       }
>>>
>>>
>>> It may collapse and let server panic.
>>>
>>
>> I am not sure how a server might panic.  At any rate, the solution is
>> simple.
>>
>> Add
>>
>>   InitializeMagick(*argv);
>>
>> after the
>>
>>   int status;
>>
>> And all should be well.  In fact it should be better since after invoking
>> InitializeMagick() once, all of GM's internal semaphores are fully
>> initialized and so you can safely invoke GMCommand() in a threaded context
>> without fear of any race condition.
>>
>> Bob
>> --
>> Bob Friesenhahn
>> [email protected], http://www.simplesystems.org/**
>> users/bfriesen/ <http://www.simplesystems.org/users/bfriesen/>
>> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
>
>
>
>
> --
> 冯立元
>



-- 
冯立元

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