Re: ORBit2.8.3 thread problem

[Kuang-Chun Cheng <kccheng openate com>]

Hi,

Sorry for my last un-clear question. I modify the echo-client.c (comes from
"ORBit beginners Documentation v1.6") and repeat my problem below.

* add "#include <linc/linc.h>" and "#include <pthread.h>"
* add "linc_set_threaded(TRUE)" before CORBA_ORB_init().
* change "orbit-local-orb" to "orbit-local-mt-orb".
* rewrite client_run() as following:

static void
client_run (Echo echo_service,
CORBA_Environment *ev)
{
char buf[1024];
int i = 0;
pthread_t thread;

pthread_create(&thread, NULL, thread_echo, NULL); // create a thread here

for (i=0; i<20000; ++i) { // this will stop when i == 8192 !!!!!!!
printf("Hello %d\n", i);
snprintf(buf, 1024, "Hello %d\n", i++);

Echo_echoString(echo_service, buf, ev);
if (etk_raised_exception (ev)) return;
}


printf("Hit any key to quit\n");
getchar();
}

* create thread_echo() as

void *thread_echo(void *arg)
{
char buf[1024];
int i = 0;

for (i=0; i<20000; ++i) {
printf("Thread %d\n", i);
snprintf(buf, 1024, "Thread %d\n", i++);
Echo_echoString(echo_service, buf, ev);
if (etk_raised_exception (ev)) return;
}
return NULL;
}

* basically, what I did is create a thread. Inside both child thread and
main thread,
I call Echo_echoString() in a loop.
If I comment out the pthread_create(), I can run the client without any
problem.
If the pthread_create() existed, then I can only run the
Echo_echoString() 8192 times
and the main thread hang up.

Could someone tell me what's wrong here ? What's the correct procedure
to invoke
CORBA method (eg Echo_echoString()) from a thread ?
Do I need to change anything in server side ??

Thanks.

Kuang-Chun Cheng
kccheng openate com








Shmyrev wrote:

>В сообщении от 27 Август 2004 22:18 Kuang-Chun Cheng написал(a):
>
>It seems that it is threads limit in your kernel. On every call new thread is 
>started. You can see all those threads by examining 'ps' command output 
>(probably, you'll need some options).
>
>Your description of the problem is rather unclear, it seems that only few 
>people can understand them. Anyway, if you can send me small complete 
>example, we can solve your problem. Or provide a link, where we can download 
>it. Example is always better.
>
>       Shmyrev
>
>  
>
>>Hi,
>>
>>Could you tell me how ?  Or where should I looking for the answer ?
>>Thanks.
>>
>>Regards
>>Kuang-Chun Cheng
>>kccheng openate com
>>
>>Colin Walters wrote:
>>    
>>
>>>On Fri, 2004-08-27 at 11:08 +0800, Kuang-Chun Cheng wrote:
>>>      
>>>
>>>>Hi,
>>>>
>>>>I run the EchoString example by calling EchoString inside a thread.
>>>>It works OK if I always call CORBA related command inside thread.
>>>>However, if I enable thread and call EchoString or any CORBA related
>>>>command from main thread ... after 4096 calls, the CORBA command
>>>>will just hang there.
>>>>
>>>>Where is the 4096 limitation comes from ?
>>>>        
>>>>
>>>That's the trial limit; you need to send a request to your object broker
>>>to purchase more messages.
>>>      
>>>
>>_______________________________________________
>>gnome-devel-list mailing list
>>gnome-devel-list gnome org
>>http://mail.gnome.org/mailman/listinfo/gnome-devel-list
>>    
>>

#include <stdio.h>
#include <signal.h>
#include <pthread.h>
#include <orbit/orbit.h>
#include <linc/linc.h>

#include "echo.h"

Echo echo_service = CORBA_OBJECT_NIL;
CORBA_Environment ev[1];

static CORBA_ORB  global_orb = CORBA_OBJECT_NIL; /* global orb */
 
static void
client_shutdown (int sig)
{
        CORBA_Environment  local_ev[1];
        CORBA_exception_init(local_ev);
 
        if (global_orb != CORBA_OBJECT_NIL)
        {
                CORBA_ORB_shutdown (global_orb, FALSE, local_ev);
                etk_abort_if_exception (local_ev, "caught exception");
        }
}
        
static void
client_init (int               *argc_ptr,
	     char              *argv[],
             CORBA_ORB         *orb,
             CORBA_Environment *ev)
{
        /* init signal handling */
 
        signal(SIGINT,   client_shutdown);
        signal(SIGQUIT,  client_shutdown);
        signal(SIGTERM,  client_shutdown);
         
        /* create Object Request Broker (ORB) */
         
        (*orb) = CORBA_ORB_init(argc_ptr, argv, "orbit-local-mt-orb", ev);
        if (etk_raised_exception(ev)) return;
}

static void
client_cleanup (CORBA_ORB                 orb,
                CORBA_Object              service,
                CORBA_Environment        *ev)
{
        /* releasing managed object */
        CORBA_Object_release(service, ev);
        if (etk_raised_exception(ev)) return;
 
        /* tear down the ORB */
        if (orb != CORBA_OBJECT_NIL)
        {
                /* going to destroy orb.. */
                CORBA_ORB_destroy(orb, ev);
                if (etk_raised_exception(ev)) return;
        }
}


void *thread_echo(void *arg)
{
	char buf[1024];
	int i = 0;

	for (i=0; i<20000; ++i) {
		printf("Thread %d\n", i);
		snprintf(buf, 1024, "Thread %d\n", i++);
		Echo_echoString(echo_service, buf, ev);
		if (etk_raised_exception (ev)) return;
	}
	return NULL;
}

static void
client_run (Echo  echo_service,
	    CORBA_Environment        *ev)
{
	char buf[1024];
	int i = 0;
	pthread_t thread;

	pthread_create(&thread, NULL, thread_echo, NULL);

	for (i=0; i<20000; ++i) {
		printf("Hello %d\n", i);
		snprintf(buf, 1024, "Hello %d\n", i++);

		Echo_echoString(echo_service, buf, ev);
		if (etk_raised_exception (ev)) return;
	}


	printf("Hit any key to quit\n");
	getchar();
}

int main (int argc, char* argv[])
{
	CORBA_char filename[] = "echo.ref";
        
        CORBA_exception_init(ev);

	linc_set_threaded(TRUE);

	client_init (&argc, argv, &global_orb, ev);
	etk_abort_if_exception(ev, "init failed");

	g_print ("Reading service reference from file \"%s\"\n", filename);

	echo_service = (Echo) etk_import_object_from_file (global_orb,
							   filename,
							   ev);
        etk_abort_if_exception(ev, "import service failed");

	client_run (echo_service, ev);
        etk_abort_if_exception(ev, "service not reachable");
 
	client_cleanup (global_orb, echo_service, ev);
        etk_abort_if_exception(ev, "cleanup failed");
 
        exit (0);
}