| |
| Door Library Functions | door_bind(3DOOR) |
| | door_bind, door_unbind - bind or unbind the current thread with the door server pool |
SYNOPSIS
| |
cc -mt [ flag ... ] file ... -ldoor [ library ... ]
#include <door.h> int door_bind(int did); |
| |
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(3DOOR) and door_create(3DOOR).
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(3DOOR). 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(3DOOR) 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
- 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.
|
| | 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 foo(); extern bar();
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(POSIX_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);
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 |
| Availability | SUNWcsu |
| Stability | Evolving |
| MT-Level | Safe |
|
| |
