[Serdev] what's the difference between the shm_malloc and pkg_malloc

[szj]

Andrei Pelinescu-Onciul wrote:

>On Mar 16, 2005 at 17:08, szj <zjsun at biigroup.com> wrote:
>  
>
>> When I browse the ser code, I found there are three kind of memory
>>allocation.The most frequently used is shm_malloc() and pkg_malloc().
>> the first have lock functions and the latter is not. I found that
>>the transaction struct cell and its field is allocated with shm_alloc,
>>but others are allocated with pkg_alloc(). I added a pointer member
>>into the cell struct. If I allocate a block of memory for my pointer
>>member with pkg_malloc(), the ser will crash when some one want to
>>establish a call through ser.  If using shm_malloc(),all will go well.
>> What I want to know is when and where I should use shm_malloc() and
>>pkg_malloc().
>>    
>>
>
>shm_malloc will alloc shared memory, that will be visible from other ser
> processes.
>pkg_malloc will use "private", per process memory (it will not be
>visible from other ser processes).
>
>pkg_malloc is much faster (because it doesn't need locking).
>
>
>If you need to alloc. something temporarily, or something that doesn't
>need to be seen from another process use pkg_malloc.
>
>
>Andrei
>
>  
>
  Thanks you very much Andrei, I see now. and I have tested successefully.

  Best Regards.

  Sun Zongjun