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Diffstat (limited to 'ipc/ipc_marequest.h')
| -rw-r--r-- | ipc/ipc_marequest.h | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/ipc/ipc_marequest.h b/ipc/ipc_marequest.h new file mode 100644 index 0000000..a55d4e2 --- /dev/null +++ b/ipc/ipc_marequest.h @@ -0,0 +1,99 @@ +/* + * Mach Operating System + * Copyright (c) 1991,1990,1989 Carnegie Mellon University + * All Rights Reserved. + * + * Permission to use, copy, modify and distribute this software and its + * documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR + * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie Mellon + * the rights to redistribute these changes. + */ +/* + * File: ipc/ipc_marequest.h + * Author: Rich Draves + * Date: 1989 + * + * Definitions for msg-accepted requests. + */ + +#ifndef _IPC_IPC_MAREQUEST_H_ +#define _IPC_IPC_MAREQUEST_H_ + +#include <mach/kern_return.h> +#include <mach/port.h> +#include <mach_debug/hash_info.h> +#include <ipc/ipc_types.h> + +/* + * A msg-accepted request is made when MACH_SEND_NOTIFY is used + * to force a message to a send right. The IE_BITS_MAREQUEST bit + * in an entry indicates the entry is blocked because MACH_SEND_NOTIFY + * has already been used to force a message. The kmsg holds + * a pointer to the marequest; it is destroyed when the kmsg + * is received/destroyed. (If the send right is destroyed, + * this just changes imar_name. If the space is destroyed, + * the marequest is left unchanged.) + * + * Locking considerations: The imar_space field is read-only and + * points to the space which locks the imar_name field. imar_soright + * is read-only. Normally it is a non-null send-once right for + * the msg-accepted notification, but in compat mode it is null + * and the notification goes to the space's notify port. Normally + * imar_name is non-null, but if the send right is destroyed then + * it is changed to be null. imar_next is locked by a bucket lock; + * imar_name is read-only when the request is in a bucket. (So lookups + * in the bucket can safely check imar_space and imar_name.) + * imar_space and imar_soright both hold references. + */ + +typedef struct ipc_marequest { + struct ipc_space *imar_space; + mach_port_name_t imar_name; + struct ipc_port *imar_soright; + struct ipc_marequest *imar_next; +} *ipc_marequest_t; + +#define IMAR_NULL ((ipc_marequest_t) 0) + +#define IPC_MAREQUEST_SIZE 16 + +extern void +ipc_marequest_init(void); + +#if MACH_IPC_DEBUG + +extern unsigned int +ipc_marequest_info(unsigned int *, hash_info_bucket_t *, unsigned int); + +#endif /* MACH_IPC_DEBUG */ + +extern mach_msg_return_t +ipc_marequest_create(ipc_space_t space, ipc_port_t port, + mach_port_name_t notify, ipc_marequest_t *marequestp); + +extern void +ipc_marequest_cancel(ipc_space_t space, mach_port_name_t name); + +extern void +ipc_marequest_rename(ipc_space_t space, + mach_port_name_t old, mach_port_name_t new); + +extern void +ipc_marequest_destroy(ipc_marequest_t marequest); + +#endif /* _IPC_IPC_MAREQUEST_H_ */ |