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/* Ports library for server construction
Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
Written by Michael I. Bushnell.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifndef _HURD_PORTS_
#define _HURD_PORTS_
#include <mach.h>
#include <stdlib.h>
struct port_info
{
struct port_class *class;
int refcnt;
int weakrefcnt;
mach_port_mscount_t mscount;
int flags;
mach_port_t port_right;
struct rpc_info *current_rpcs;
struct port_bucket *bucket;
void **hentry;
struct port_info *next, **prevp; /* links on port_class list */
};
/* FLAGS above are the following: */
#define PORT_HAS_SENDRIGHTS 0x0001 /* send rights extant */
#define PORT_INHIBITED 0x0002 /* block RPCs */
#define PORT_BLOCKED 0x0004 /* if INHIBITED, someone is blocked */
#define PORT_INHIBIT_WAIT 0x0008 /* someone wants to start inihibt */
struct port_bucket
{
mach_port_t portset;
struct ihash *htable;
int rpcs;
int flags;
int count;
struct port_bucket *next;
};
/* FLAGS above are the following: */
#define PORT_BUCKET_INHIBITED 0x0001 /* block RPC's */
#define PORT_BUCKET_BLOCKED 0x0002 /* if INHIBITED, someone is blocked */
#define PORT_BUCKET_INHIBIT_WAIT 0x004 /* someone wants to start inhibit */
#define PORT_BUCKET_NO_ALLOC 0x0008 /* block allocation */
#define PORT_BUCKET_ALLOC_WAIT 0x0010 /* someone wants to allocate */
struct port_class
{
int flags;
int rpcs;
struct port_info *ports;
int count;
void (*clean_routine) (void *);
void (*dropweak_routine) (void *);
};
/* FLAGS are the following: */
#define PORT_CLASS_INHIBITED 0x0001 /* block RPCs */
#define PORT_CLASS_BLOCKED 0x0002 /* if INHIBITED, someone is blocked */
#define PORT_CLASS_INHIBIT_WAIT 0x0004 /* someone wants to start INHIBIT */
#define PORT_CLASS_NO_ALLOC 0x0008 /* block allocation */
#define PORT_CLASS_ALLOC_WAIT 0x0010 /* someone wants to allocate */
struct rpc_info
{
thread_t thread;
struct rpc_info *next, **prevp;
};
/* Port creation and port right frobbing */
/* Create and return a new bucket. */
struct port_bucket *ports_create_bucket (void);
/* Create and return a new port class. If nonzero, CLEAN_ROUTINE will
be called for each allocated port object in this class when it is
being destroyed. If nonzero, DROPWEAK_ROUTINE will be called
to request weak references to be dropped. (If DROPWEAK_ROUTINE is null,
then normal references and hard references will be identical for
ports of this class.) */
struct port_class *ports_create_class (void (*clean_routine)(void *),
void (*dropweak_routine)(void *));
/* Create and return a new port in BUCKET and CLASS; SIZE bytes will
be allocated to hold the port structure and whatever private data
the user desires. */
void *ports_allocate_port (struct port_bucket *bucket, size_t size,
struct port_class *class);
/* For an existing RECEIVE right, create and return a new port structure;
BUCKET, SIZE, and CLASS args are as for ports_allocate_port. */
void *ports_intern_external_port (struct port_bucket *bucket,
mach_port_t receive, size_t size,
struct port_class *class);
/* Destroy the receive right currently associated with PORT and allocate
a new one. */
void ports_reallocate_port (void *port);
/* Destroy the receive right currently associated with PORT and designate
RECEIVE as the new one. */
void ports_reallocate_from_external (void *port, mach_port_t receive);
/* Destroy the receive right currently associated with PORT. After
this call, ports_reallocate_port and ports_reallocate_from_external
may not be used. */
void ports_destroy_right (void *port);
/* Return the name of the receive right associated with PORT. The user
is responsible for creating an ordinary send right from this name. */
mach_port_t ports_get_right (void *port);
/* Reference counting */
/* Look up PORT and return the associated port structure, allocating a
reference. If the call fails, return 0. If BUCKET is nonzero,
then it specifies a bucket to search; otherwise all buckets will be
searched. If CLASS is nonzero, then the lookup will fail if PORT
is not in CLASS. */
void *ports_lookup_port (struct port_bucket *bucket,
mach_port_t port, struct port_class *class);
/* Allocate another reference to PORT. */
void ports_port_ref (void *port);
/* Allocate a weak reference to PORT. */
void ports_port_ref_weak (void *port);
/* Drop a reference to PORT. */
void ports_port_deref (void *port);
/* Drop a weak reference to PORT. */
void ports_port_deref_weak (void *port);
/* The user is responsible for listening for no senders notifications;
when one arrives, call this routine for the PORT the message was
sent to, providing the MSCOUNT from the notification. */
void ports_no_senders (void *port, mach_port_mscount_t mscount);
/* Block port creation of new ports in CLASS. Return the number
of ports currently in CLASS. */
int ports_count_class (struct port_class *class);
/* Block port creation of new ports in BUCKET. Return the number
of ports currently in BUCKET. */
int ports_count_bucket (struct port_bucket *bucket);
/* Permit suspended port creation (blocked by ports_count_class)
to continue. */
void ports_enable_class (struct port_class *class);
/* Permit suspend port creation (blocked by ports_count_bucket)
to continue. */
void ports_enable_bucket (struct port_bucket *bucket);
/* Call FUN once for each port in BUCKET. */
error_t ports_bucket_iterate (struct port_bucket *bucket,
error_t (*fun)(void *port));
/* RPC management */
/* Type of MiG demuxer routines. */
typedef int (*ports_demuxer_type)(mach_msg_header_t *inp,
mach_msg_header_t *outp);
/* Call this when an RPC is beginning on PORT. INFO should be
allocated by the caller and will be used to hold dynamic state.
If this RPC should be abandoned, return EDIED; otherwise we
return zero. */
error_t ports_begin_rpc (void *port, struct rpc_info *info);
/* Call this when an RPC is concluding. Args must be as for the
paired call to ports_begin_rpc. */
void ports_end_rpc (void *port, struct rpc_info *info);
/* Begin handling operations for the ports in BUCKET, calling DEMUXER
for each incoming message. Return if TIMEOUT is nonzero and no
messages have been received for TIMEOUT milliseconds. Use
only one thread (the calling thread). */
void ports_manage_port_operations_one_thread(struct port_bucket *bucket,
ports_demuxer_type demuxer,
int timeout);
/* Begin handling operations for the ports in BUCKET, calling DEMUXER
for each incoming message. Return if GLOBAL_TIMEOUT is nonzero and
no messages have been receieved for GLOBAL_TIMEOUT milliseconds.
Create threads as necessary to handle incoming messages so that no
port is starved because of sluggishness on another port. All
threads created (and the calling thread) will be wired with
cthread_wire if WIRE_CTHREADS is non-zero. All threads created
(and the calling thread) will be wired with thread_wire if
WIRE_THREADS is non-zero (it must be the priviliged host port in
order to succeed). If LOCAL_TIMEOUT is non-zero, then individual
threads will die off if they handle no incoming messages for
LOCAL_TIMEOUT milliseconds. */
void ports_manage_port_operations_multithread (struct port_bucket *bucket,
ports_demuxer_type demuxer,
int thread_timeout,
int global_timeout,
int wire_cthreads,
mach_port_t wire_threads);
/* Interrupt any pending RPC on PORT. Wait for all pending RPC's to
finish, and then block any new RPC's starting on that port. */
void ports_inhibit_port_rpcs (void *port);
/* Similar to ports_inhibit_port_rpcs, but affects all ports in CLASS. */
void ports_inhibit_class_rpcs (struct port_class *class);
/* Similar to ports_inhibit_port_rpcs, but affects all ports in BUCKET. */
void ports_inhibit_bucket_rpcs (struct port_bucket *bucket);
/* Similar to ports_inhibit_port_rpcs, but affects all ports whatsoever. */
void ports_inhibit_all_rpcs (void);
/* Reverse the effect of a previous ports_inhibit_port_rpcs for this PORT,
allowing blocked RPC's to continue. */
void ports_resume_port_rpcs (void *port);
/* Reverse the effect of a previous ports_inhibit_class_rpcs for CLASS. */
void ports_resume_class_rpcs (struct port_class *class);
/* Reverse the effect of a previous ports_inhibit_bucket_rpcs for BUCKET. */
void ports_resume_bucket_rpcs (struct port_bucket *bucket);
/* Reverse the effect of a previous ports_inhibit_all_rpcs. */
void ports_resume_all_rpcs (void);
/* Cancel (with thread_cancel) any RPC's in progress on PORT. */
void ports_interrupt_rpc (void *port);
/* Private data */
extern struct mutex _ports_lock;
extern struct condition _ports_block;
extern struct port_bucket *_ports_all_buckets;
extern int _ports_total_rpcs;
extern int _ports_flags;
#define _PORTS_INHIBITED 0x01
#define _PORTS_BLOCKED 0x02
#define _PORTS_INHIBIT_WAIT 0x04
void _ports_complete_deallocate (struct port_info *);
#endif
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