[Kamailio-Devel] Creating shared memory during runtime

[Daniel-Constantin Mierla]

Hello,

no, it won't work. you have to allocate a pointer where to store the 
pointer.

char **address;
char *string;

static int mod_init(void)
{
	address = shm_malloc(sizeof(char*));
	string = shm_malloc(sizeof(char) * 100);
	*address = string;
	// Store some value in 'string'.
}

static struct mi_root* mi_function(struct mi_root* cmd_tree, void* param) {
	string = *address;
	shm_free(string);
	string = shm_malloc(sizeof(char) * 200);
	*address = string;
	// Store some new value in 'string'.
}

And you probably have to think about races and use some locking mechanism.

Cheers,
Daniel


On 01/09/2009 07:36 PM, Iñaki Baz Castillo wrote:
> Hi, if a Kamailio process (i.e. via a MI function) frees a shm variable and 
> creates it again (so it would be now allocated in a memory different position 
> and have a different size), will the rest of Kamailio running processes 
> realize of it?
>
> This is:
>
> ---------------------
> char *string;
>
> static int mod_init(void)
> {
> 	string = shm_malloc(sizeof(char) * 100);
> 	// Store some value in 'string'.
> }
>
> static struct mi_root* mi_function(struct mi_root* cmd_tree, void* param) {
> 	shm_free(string);
> 	string = shm_malloc(sizeof(char) * 200);
> 	// Store some new value in 'string'.
> }
> ---------------------
>
> Will it work?
> If not, how could achieve it? Must I reserve the max possible size 
> in "mod_init()" and use the same pointer all the time during runtime?
>
> Thanks.
>
>
>   

-- 
Daniel-Constantin Mierla
http://www.asipto.com