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door_bind(3door) [minix man page]

door_bind(3DOOR)					      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); 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(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. 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 |Evolving | +-----------------------------+-----------------------------+ |MT-Level |Safe | +-----------------------------+-----------------------------+ SEE ALSO
fork(2),door_create(3DOOR), door_return(3DOOR), door_server_create(3DOOR), libdoor(3LIB), attributes(5) SunOS 5.10 23 Apr 2003 door_bind(3DOOR)
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