thread argument problem

[is_vlb50]

I have problem with pass structure to thread function in SOLARIS.When I
pass it to created thread it always has empty values.

my structure defined as:
typedef struct momMSG{
struct mbhdr hd;
struct SCRIPTMSG MOMBuf;
}MY_SCRIPTMSG;

In my main function:

MY_SCRIPTMSG rcvVLMOMbuf;
--- fill rcvVLMOMbuf with values
if((rv = thr_create(NULL,0,ServerThread,(void *)
&rcvVLMOMbuf,THR_DETACHED, &tid)) == 0)

And in thread function:
void* ServerThread(void *arg)
{
MY_SCRIPTMSG* preceivedMSG = (MY_SCRIPTMSG*) arg;
}
The pointer preceivedMSG point on empty values.
What is the reason thanks

 

[Maxim Yegorushkin]

I have problem with pass structure to thread function in SOLARIS.When I
pass it to created thread it always has empty values.

my structure defined as:
typedef struct momMSG{
struct mbhdr hd;
struct SCRIPTMSG MOMBuf;
}MY_SCRIPTMSG;

In my main function:

MY_SCRIPTMSG rcvVLMOMbuf;
--- fill rcvVLMOMbuf with values
if((rv = thr_create(NULL,0,ServerThread,(void *)
&rcvVLMOMbuf,THR_DETACHED, &tid)) == 0)

And in thread function:
void* ServerThread(void *arg)
{
MY_SCRIPTMSG* preceivedMSG = (MY_SCRIPTMSG*) arg;
}
The pointer preceivedMSG point on empty values.
What is the reason thanks

A likely reason may be that you pass a pointer to a structure object on
the stack. By the time your new thread starts executing the object may
well be gone and you are left with a stale pointer. To fix allocate the
structure object on the heap using malloc() and free() it in the new
thread.

 

[is_vlb50]

You mean that I need before thr_create clone my structure MY_SCRIPTMSG
to another,allocated by malloc() ?
Thanks

 

[Barry Margolin]

You mean that I need before thr_create clone my structure MY_SCRIPTMSG
to another,allocated by malloc() ?
Thanks

Yes.

P.S. Please include context so your question makes sense. See

http://cfaj.freeshell.org/google/