On Mar 16, 2005 at 17:08, szj zjsun@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