door_bind(3C)						   Standard C Library Functions 					     door_bind(3C)

NAME

       door_bind, door_unbind - bind or unbind the current thread with the door server pool

SYNOPSIS

       cc -mt [ flag... ] file... [ library... ]
       #include <door.h>

       int door_bind(int did);

       int door_unbind(void);

DESCRIPTION

       The door_bind() function associates the current thread with a door server pool. A door server pool is a private pool of server threads that
       is available to serve door invocations associated with the door did.

       The door_unbind() function breaks the association of door_bind() by removing any private door pool binding that is associated with the cur-
       rent thread.

       Normally,  door	server	threads  are placed in a global pool of available  threads that invocations on any door can use to dispatch a door
       invocation. A door that has been created with DOOR_PRIVATE only uses server threads that have been associated with the door by door_bind().
       It is therefore necessary to bind at least one server thread  to doors created with DOOR_PRIVATE.

       The  server  thread  create  function,  door_server_create(),  is  initially  called  by  the  system during a door_create() operation. See
       door_server_create(3C) and  door_create(3C).

       The current thread is added to the private pool of server  threads associated with a door during the  next  door_return()  (that  has  been
       issued  by  the	current thread after an associated  door_bind()). See door_return(3C). A server thread performing a  door_bind() on a door
       that is already bound to a different door performs an implicit door_unbind() of the previous door.

       If a process containing threads that have been bound to a door calls fork(2), the threads in the child process will be bound to an  invalid
       door, and any calls to door_return(3C) will result in an error.

RETURN VALUES

       Upon successful completion, a 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The  door_bind() and  door_unbind() functions fail if:

       EBADF	 The did argument is not a valid door.

       EBADF	 The door_unbind() function was called by a thread that is currently not bound.

       EINVAL	 did was not created with the DOOR_PRIVATE attribute.

EXAMPLES

       Example 1 Use door_bind() to create private server pools for two doors.

       The  following example shows the use of door_bind() to create private server pools for two doors, d1 and d2. Function my_create() is called
       when a new server thread is needed; it creates a thread running function, my_server_create(), which binds itself to one of the two doors.

	 #include <door.h>
	 #include <thread.h>
	 #include <pthread.h>
	 thread_key_t door_key;
	 int d1 = -1;
	 int d2 = -1;
	 cond_t cv;	  /* statically initialized to zero */
	 mutex_t lock;	  /* statically initialized to zero */

	 extern void foo(void *, char *, size_t, door_desc_t *, uint_t);
	 extern void bar(void *, char *, size_t, door_desc_t *, uint_t);

	 static void *
	 my_server_create(void *arg)
	 {
		 /* wait for d1 & d2 to be initialized */
		 mutex_lock(&lock);
		 while (d1 == -1 || d2 == -1)
			 cond_wait(&cv, &lock);
		 mutex_unlock(&lock);

		 if (arg == (void *)foo){
			 /* bind thread with pool associated with d1 */
			 thr_setspecific(door_key, (void *)foo);
			 if (door_bind(d1) < 0) {
				 perror("door_bind"); exit (-1);
			 }
		 } else if (arg == (void *)bar) {
			 /* bind thread with pool associated with d2 */
			 thr_setspecific(door_key, (void *)bar);
			 if (door_bind(d2) < 0) {
			 /* bind thread to d2 thread pool */
				 perror("door_bind"); exit (-1);
			 }
		 }
		 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
		 door_return(NULL, 0, NULL, 0);  /* Wait for door invocation */
	 }

	 static void
	 my_create(door_info_t *dip)
	 {
		 /* Pass the door identity information to create function */
		 thr_create(NULL, 0, my_server_create, (void *)dip->di_proc,
			 THR_BOUND | THR_DETACHED, NULL);
	 }

	 main()
	 {
		 (void) door_server_create(my_create);
		 if (thr_keycreate(&door_key, NULL) != 0) {
			 perror("thr_keycreate");
			 exit(1);
		 }
		 mutex_lock(&lock);
		 d1 = door_create(foo, NULL, DOOR_PRIVATE); /* Private pool */
		 d2 = door_create(bar, NULL, DOOR_PRIVATE); /* Private pool */
		 cond_signal(&cv);
		 mutex_unlock(&lock);
		 while(1)
			 pause();
	 }

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Architecture		     |all			   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Stable			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       fork(2),door_create(3C), door_return(3C), door_server_create(3C), attributes(5)

SunOS 5.11							    22 Mar 2005 						     door_bind(3C)