* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* @OSF_COPYRIGHT@
- *
+ *
*/
#include <kern/sync_sema.h>
*/
kern_return_t
port_name_to_semaphore(
- mach_port_name_t name,
- semaphore_t *semaphorep)
+ mach_port_name_t name,
+ semaphore_t *semaphorep)
{
ipc_port_t kern_port;
kern_return_t kr;
return KERN_INVALID_NAME;
}
- kr = ipc_object_translate(current_space(), name, MACH_PORT_RIGHT_SEND,
- (ipc_object_t *) &kern_port);
+ kr = ipc_port_translate_send(current_space(), name, &kern_port);
if (kr != KERN_SUCCESS) {
*semaphorep = SEMAPHORE_NULL;
return kr;
assert(IP_VALID(kern_port));
*semaphorep = convert_port_to_semaphore(kern_port);
+ if (*semaphorep == SEMAPHORE_NULL) {
+ /* the port is valid, but doesn't denote a semaphore */
+ kr = KERN_INVALID_CAPABILITY;
+ } else {
+ kr = KERN_SUCCESS;
+ }
ip_unlock(kern_port);
- return KERN_SUCCESS;
+ return kr;
}
/*
* Port may or may not be locked.
*/
semaphore_t
-convert_port_to_semaphore (ipc_port_t port)
+convert_port_to_semaphore(ipc_port_t port)
{
-
if (IP_VALID(port)) {
semaphore_t semaphore;
* keeps the semaphore bound to the port (and active).
*/
if (ip_kotype(port) == IKOT_SEMAPHORE) {
- assert(ip_active(port));
+ require_ip_active(port);
semaphore = (semaphore_t) port->ip_kobject;
semaphore_reference(semaphore);
- return (semaphore);
+ return semaphore;
}
}
return SEMAPHORE_NULL;
* all extant send rights collectively.
*/
ipc_port_t
-convert_semaphore_to_port (semaphore_t semaphore)
+convert_semaphore_to_port(semaphore_t semaphore)
{
- ipc_port_t port, send;
-
- if (semaphore == SEMAPHORE_NULL)
- return (IP_NULL);
-
- /* caller is donating a reference */
- port = semaphore->port;
-
- if (!IP_VALID(port)) {
- port = ipc_port_alloc_kernel();
- assert(IP_VALID(port));
- ipc_kobject_set_atomically(port, (ipc_kobject_t) semaphore, IKOT_SEMAPHORE);
-
- /* If we lose the race, deallocate and pick up the other guy's port */
- if (!OSCompareAndSwapPtr(IP_NULL, port, &semaphore->port)) {
- ipc_port_dealloc_kernel(port);
- port = semaphore->port;
- assert(ip_kotype(port) == IKOT_SEMAPHORE);
- assert(port->ip_kobject == (ipc_kobject_t)semaphore);
- }
+ if (semaphore == SEMAPHORE_NULL) {
+ return IP_NULL;
}
- ip_lock(port);
- assert(ip_active(port));
- send = ipc_port_make_send_locked(port);
-
- if (1 == port->ip_srights) {
- ipc_port_t old_notify;
-
- /* transfer our ref to the port, and arm the no-senders notification */
- assert(IP_NULL == port->ip_nsrequest);
- ipc_port_nsrequest(port, port->ip_mscount, ipc_port_make_sonce_locked(port), &old_notify);
- /* port unlocked */
- assert(IP_NULL == old_notify);
- } else {
- /* piggyback on the existing port reference, so consume ours */
- ip_unlock(port);
+ /*
+ * make a send right and donate our reference for
+ * semaphore_notify if this is the first send right
+ */
+ if (!ipc_kobject_make_send_lazy_alloc_port(&semaphore->port,
+ (ipc_kobject_t) semaphore, IKOT_SEMAPHORE)) {
semaphore_dereference(semaphore);
}
- return (send);
+ return semaphore->port;
}
/*
{
mach_no_senders_notification_t *notification = (void *)msg;
ipc_port_t port = notification->not_header.msgh_remote_port;
- semaphore_t semaphore;
- assert(ip_active(port));
+ require_ip_active(port);
assert(IKOT_SEMAPHORE == ip_kotype(port));
- semaphore = (semaphore_t)port->ip_kobject;
- semaphore_dereference(semaphore);
+ semaphore_dereference((semaphore_t)port->ip_kobject);
}
lock_set_t
-convert_port_to_lock_set (__unused ipc_port_t port)
+convert_port_to_lock_set(__unused ipc_port_t port)
{
- return (LOCK_SET_NULL);
+ return LOCK_SET_NULL;
}
ipc_port_t
-convert_lock_set_to_port (__unused lock_set_t lock_set)
+convert_lock_set_to_port(__unused lock_set_t lock_set)
{
- return (IP_NULL);
+ return IP_NULL;
}
-
projects / apple / xnu.git / blobdiff