te
Copyright (c) 2005, Sun Microsystems, Inc. All Rights Reserved.
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
door_bind, door_unbind - bind or unbind the current thread with the door server pool

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

int door_bind(int did);

int door_unbind(void);

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 current 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.

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

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

EBADF

EBADF

EINVAL

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();
}

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

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Architecture	all
Interface Stability	Stable
MT-Level	Safe

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