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Sweden-Number/server/thread.c

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/*
* Server-side thread management
*
* Copyright (C) 1998 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <time.h>
#ifdef HAVE_POLL_H
#include <poll.h>
#endif
#ifdef HAVE_SCHED_H
#include <sched.h>
#endif
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winternl.h"
#include "file.h"
#include "handle.h"
#include "process.h"
#include "thread.h"
#include "request.h"
#include "user.h"
#include "security.h"
#define CPU_FLAG(cpu) (1 << (cpu))
#ifdef __i386__
static const unsigned int supported_cpus = CPU_FLAG(CPU_x86);
#elif defined(__x86_64__)
static const unsigned int supported_cpus = CPU_FLAG(CPU_x86_64) | CPU_FLAG(CPU_x86);
#elif defined(__ALPHA__)
static const unsigned int supported_cpus = CPU_FLAG(CPU_ALPHA);
#elif defined(__powerpc__)
static const unsigned int supported_cpus = CPU_FLAG(CPU_POWERPC);
#elif defined(__sparc__)
static const unsigned int supported_cpus = CPU_FLAG(CPU_SPARC);
#else
#error Unsupported CPU
#endif
/* thread queues */
struct thread_wait
{
struct thread_wait *next; /* next wait structure for this thread */
struct thread *thread; /* owner thread */
int count; /* count of objects */
int flags;
client_ptr_t cookie; /* magic cookie to return to client */
timeout_t timeout;
struct timeout_user *user;
struct wait_queue_entry queues[1];
};
/* asynchronous procedure calls */
struct thread_apc
{
struct object obj; /* object header */
struct list entry; /* queue linked list */
struct thread *caller; /* thread that queued this apc */
struct object *owner; /* object that queued this apc */
int executed; /* has it been executed by the client? */
apc_call_t call; /* call arguments */
apc_result_t result; /* call results once executed */
};
static void dump_thread_apc( struct object *obj, int verbose );
static int thread_apc_signaled( struct object *obj, struct thread *thread );
static void thread_apc_destroy( struct object *obj );
static void clear_apc_queue( struct list *queue );
static const struct object_ops thread_apc_ops =
{
sizeof(struct thread_apc), /* size */
dump_thread_apc, /* dump */
no_get_type, /* get_type */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
thread_apc_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
no_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
no_lookup_name, /* lookup_name */
no_open_file, /* open_file */
no_close_handle, /* close_handle */
thread_apc_destroy /* destroy */
};
/* thread operations */
static void dump_thread( struct object *obj, int verbose );
static int thread_signaled( struct object *obj, struct thread *thread );
static unsigned int thread_map_access( struct object *obj, unsigned int access );
static void thread_poll_event( struct fd *fd, int event );
static void destroy_thread( struct object *obj );
static const struct object_ops thread_ops =
{
sizeof(struct thread), /* size */
dump_thread, /* dump */
no_get_type, /* get_type */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
thread_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
thread_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
no_lookup_name, /* lookup_name */
no_open_file, /* open_file */
no_close_handle, /* close_handle */
destroy_thread /* destroy */
};
static const struct fd_ops thread_fd_ops =
{
NULL, /* get_poll_events */
thread_poll_event, /* poll_event */
NULL, /* flush */
NULL, /* get_fd_type */
NULL, /* ioctl */
NULL, /* queue_async */
NULL, /* reselect_async */
NULL /* cancel_async */
};
static struct list thread_list = LIST_INIT(thread_list);
/* initialize the structure for a newly allocated thread */
static inline void init_thread_structure( struct thread *thread )
{
int i;
thread->unix_pid = -1; /* not known yet */
thread->unix_tid = -1; /* not known yet */
thread->context = NULL;
thread->suspend_context = NULL;
thread->teb = 0;
thread->debug_ctx = NULL;
thread->debug_event = NULL;
thread->debug_break = 0;
thread->queue = NULL;
thread->wait = NULL;
thread->error = 0;
thread->req_data = NULL;
thread->req_toread = 0;
thread->reply_data = NULL;
thread->reply_towrite = 0;
thread->request_fd = NULL;
thread->reply_fd = NULL;
thread->wait_fd = NULL;
thread->state = RUNNING;
thread->exit_code = 0;
thread->priority = 0;
thread->affinity = ~0;
thread->suspend = 0;
thread->desktop_users = 0;
thread->token = NULL;
thread->creation_time = current_time;
thread->exit_time = 0;
list_init( &thread->mutex_list );
list_init( &thread->system_apc );
list_init( &thread->user_apc );
for (i = 0; i < MAX_INFLIGHT_FDS; i++)
thread->inflight[i].server = thread->inflight[i].client = -1;
}
/* check if address looks valid for a client-side data structure (TEB etc.) */
static inline int is_valid_address( client_ptr_t addr )
{
return addr && !(addr % sizeof(int));
}
/* create a new thread */
struct thread *create_thread( int fd, struct process *process )
{
struct thread *thread;
if (!(thread = alloc_object( &thread_ops ))) return NULL;
init_thread_structure( thread );
thread->process = (struct process *)grab_object( process );
thread->desktop = process->desktop;
if (!current) current = thread;
list_add_head( &thread_list, &thread->entry );
if (!(thread->id = alloc_ptid( thread )))
{
release_object( thread );
return NULL;
}
if (!(thread->request_fd = create_anonymous_fd( &thread_fd_ops, fd, &thread->obj, 0 )))
{
release_object( thread );
return NULL;
}
set_fd_events( thread->request_fd, POLLIN ); /* start listening to events */
add_process_thread( thread->process, thread );
return thread;
}
/* handle a client event */
static void thread_poll_event( struct fd *fd, int event )
{
struct thread *thread = get_fd_user( fd );
assert( thread->obj.ops == &thread_ops );
if (event & (POLLERR | POLLHUP)) kill_thread( thread, 0 );
else if (event & POLLIN) read_request( thread );
else if (event & POLLOUT) write_reply( thread );
}
/* cleanup everything that is no longer needed by a dead thread */
/* used by destroy_thread and kill_thread */
static void cleanup_thread( struct thread *thread )
{
int i;
clear_apc_queue( &thread->system_apc );
clear_apc_queue( &thread->user_apc );
free( thread->req_data );
free( thread->reply_data );
if (thread->request_fd) release_object( thread->request_fd );
if (thread->reply_fd) release_object( thread->reply_fd );
if (thread->wait_fd) release_object( thread->wait_fd );
free( thread->suspend_context );
cleanup_clipboard_thread(thread);
destroy_thread_windows( thread );
free_msg_queue( thread );
close_thread_desktop( thread );
for (i = 0; i < MAX_INFLIGHT_FDS; i++)
{
if (thread->inflight[i].client != -1)
{
close( thread->inflight[i].server );
thread->inflight[i].client = thread->inflight[i].server = -1;
}
}
thread->req_data = NULL;
thread->reply_data = NULL;
thread->request_fd = NULL;
thread->reply_fd = NULL;
thread->wait_fd = NULL;
thread->context = NULL;
thread->suspend_context = NULL;
thread->desktop = 0;
}
/* destroy a thread when its refcount is 0 */
static void destroy_thread( struct object *obj )
{
struct thread *thread = (struct thread *)obj;
assert( obj->ops == &thread_ops );
assert( !thread->debug_ctx ); /* cannot still be debugging something */
list_remove( &thread->entry );
cleanup_thread( thread );
release_object( thread->process );
if (thread->id) free_ptid( thread->id );
if (thread->token) release_object( thread->token );
}
/* dump a thread on stdout for debugging purposes */
static void dump_thread( struct object *obj, int verbose )
{
struct thread *thread = (struct thread *)obj;
assert( obj->ops == &thread_ops );
fprintf( stderr, "Thread id=%04x unix pid=%d unix tid=%d state=%d\n",
thread->id, thread->unix_pid, thread->unix_tid, thread->state );
}
static int thread_signaled( struct object *obj, struct thread *thread )
{
struct thread *mythread = (struct thread *)obj;
return (mythread->state == TERMINATED);
}
static unsigned int thread_map_access( struct object *obj, unsigned int access )
{
if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | SYNCHRONIZE;
if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | SYNCHRONIZE;
if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
if (access & GENERIC_ALL) access |= THREAD_ALL_ACCESS;
return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
}
static void dump_thread_apc( struct object *obj, int verbose )
{
struct thread_apc *apc = (struct thread_apc *)obj;
assert( obj->ops == &thread_apc_ops );
fprintf( stderr, "APC owner=%p type=%u\n", apc->owner, apc->call.type );
}
static int thread_apc_signaled( struct object *obj, struct thread *thread )
{
struct thread_apc *apc = (struct thread_apc *)obj;
return apc->executed;
}
static void thread_apc_destroy( struct object *obj )
{
struct thread_apc *apc = (struct thread_apc *)obj;
if (apc->caller) release_object( apc->caller );
if (apc->owner) release_object( apc->owner );
}
/* queue an async procedure call */
static struct thread_apc *create_apc( struct object *owner, const apc_call_t *call_data )
{
struct thread_apc *apc;
if ((apc = alloc_object( &thread_apc_ops )))
{
apc->call = *call_data;
apc->caller = NULL;
apc->owner = owner;
apc->executed = 0;
apc->result.type = APC_NONE;
if (owner) grab_object( owner );
}
return apc;
}
/* get a thread pointer from a thread id (and increment the refcount) */
struct thread *get_thread_from_id( thread_id_t id )
{
struct object *obj = get_ptid_entry( id );
if (obj && obj->ops == &thread_ops) return (struct thread *)grab_object( obj );
set_error( STATUS_INVALID_CID );
return NULL;
}
/* get a thread from a handle (and increment the refcount) */
struct thread *get_thread_from_handle( obj_handle_t handle, unsigned int access )
{
return (struct thread *)get_handle_obj( current->process, handle,
access, &thread_ops );
}
/* find a thread from a Unix tid */
struct thread *get_thread_from_tid( int tid )
{
struct thread *thread;
LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
{
if (thread->unix_tid == tid) return thread;
}
return NULL;
}
/* find a thread from a Unix pid */
struct thread *get_thread_from_pid( int pid )
{
struct thread *thread;
LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
{
if (thread->unix_pid == pid) return thread;
}
return NULL;
}
void set_thread_affinity( struct thread *thread, affinity_t affinity )
{
if ((affinity & thread->process->affinity) != affinity)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
#ifdef HAVE_SCHED_SETAFFINITY
if (thread->unix_pid != -1)
{
cpu_set_t set;
int i;
affinity_t mask;
CPU_ZERO( &set );
for (i = 0, mask = 1; mask; i++, mask <<= 1)
if (affinity & mask) CPU_SET( i, &set );
if (!sched_setaffinity( thread->unix_pid, sizeof(set), &set ))
thread->affinity = affinity;
else
file_set_error();
}
else set_error( STATUS_ACCESS_DENIED );
#else
thread->affinity = affinity;
#endif
}
#define THREAD_PRIORITY_REALTIME_HIGHEST 6
#define THREAD_PRIORITY_REALTIME_LOWEST -7
/* set all information about a thread */
static void set_thread_info( struct thread *thread,
const struct set_thread_info_request *req )
{
if (req->mask & SET_THREAD_INFO_PRIORITY)
{
int max = THREAD_PRIORITY_HIGHEST;
int min = THREAD_PRIORITY_LOWEST;
if (thread->process->priority == PROCESS_PRIOCLASS_REALTIME)
{
max = THREAD_PRIORITY_REALTIME_HIGHEST;
min = THREAD_PRIORITY_REALTIME_LOWEST;
}
if ((req->priority >= min && req->priority <= max) ||
req->priority == THREAD_PRIORITY_IDLE ||
req->priority == THREAD_PRIORITY_TIME_CRITICAL)
thread->priority = req->priority;
else
set_error( STATUS_INVALID_PARAMETER );
}
if (req->mask & SET_THREAD_INFO_AFFINITY)
set_thread_affinity( thread, req->affinity );
if (req->mask & SET_THREAD_INFO_TOKEN)
security_set_thread_token( thread, req->token );
}
/* stop a thread (at the Unix level) */
void stop_thread( struct thread *thread )
{
if (thread->context) return; /* already inside a debug event, no need for a signal */
/* can't stop a thread while initialisation is in progress */
if (is_process_init_done(thread->process)) send_thread_signal( thread, SIGUSR1 );
}
/* suspend a thread */
static int suspend_thread( struct thread *thread )
{
int old_count = thread->suspend;
if (thread->suspend < MAXIMUM_SUSPEND_COUNT)
{
if (!(thread->process->suspend + thread->suspend++)) stop_thread( thread );
}
else set_error( STATUS_SUSPEND_COUNT_EXCEEDED );
return old_count;
}
/* resume a thread */
static int resume_thread( struct thread *thread )
{
int old_count = thread->suspend;
if (thread->suspend > 0)
{
if (!(--thread->suspend + thread->process->suspend)) wake_thread( thread );
}
return old_count;
}
/* add a thread to an object wait queue; return 1 if OK, 0 on error */
int add_queue( struct object *obj, struct wait_queue_entry *entry )
{
grab_object( obj );
entry->obj = obj;
list_add_tail( &obj->wait_queue, &entry->entry );
return 1;
}
/* remove a thread from an object wait queue */
void remove_queue( struct object *obj, struct wait_queue_entry *entry )
{
list_remove( &entry->entry );
release_object( obj );
}
/* finish waiting */
static void end_wait( struct thread *thread )
{
struct thread_wait *wait = thread->wait;
struct wait_queue_entry *entry;
int i;
assert( wait );
thread->wait = wait->next;
for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
entry->obj->ops->remove_queue( entry->obj, entry );
if (wait->user) remove_timeout_user( wait->user );
free( wait );
}
/* build the thread wait structure */
static int wait_on( unsigned int count, struct object *objects[], int flags, timeout_t timeout )
{
struct thread_wait *wait;
struct wait_queue_entry *entry;
unsigned int i;
if (!(wait = mem_alloc( FIELD_OFFSET(struct thread_wait, queues[count]) ))) return 0;
wait->next = current->wait;
wait->thread = current;
wait->count = count;
wait->flags = flags;
wait->user = NULL;
wait->timeout = timeout;
current->wait = wait;
for (i = 0, entry = wait->queues; i < count; i++, entry++)
{
struct object *obj = objects[i];
entry->thread = current;
if (!obj->ops->add_queue( obj, entry ))
{
wait->count = i;
end_wait( current );
return 0;
}
}
return 1;
}
/* check if the thread waiting condition is satisfied */
static int check_wait( struct thread *thread )
{
int i, signaled;
struct thread_wait *wait = thread->wait;
struct wait_queue_entry *entry = wait->queues;
assert( wait );
if ((wait->flags & SELECT_INTERRUPTIBLE) && !list_empty( &thread->system_apc ))
return STATUS_USER_APC;
/* Suspended threads may not acquire locks, but they can run system APCs */
if (thread->process->suspend + thread->suspend > 0) return -1;
if (wait->flags & SELECT_ALL)
{
int not_ok = 0;
/* Note: we must check them all anyway, as some objects may
* want to do something when signaled, even if others are not */
for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
not_ok |= !entry->obj->ops->signaled( entry->obj, thread );
if (not_ok) goto other_checks;
/* Wait satisfied: tell it to all objects */
signaled = 0;
for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
if (entry->obj->ops->satisfied( entry->obj, thread ))
signaled = STATUS_ABANDONED_WAIT_0;
return signaled;
}
else
{
for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
{
if (!entry->obj->ops->signaled( entry->obj, thread )) continue;
/* Wait satisfied: tell it to the object */
signaled = i;
if (entry->obj->ops->satisfied( entry->obj, thread ))
signaled = i + STATUS_ABANDONED_WAIT_0;
return signaled;
}
}
other_checks:
if ((wait->flags & SELECT_ALERTABLE) && !list_empty(&thread->user_apc)) return STATUS_USER_APC;
if (wait->timeout <= current_time) return STATUS_TIMEOUT;
return -1;
}
/* send the wakeup signal to a thread */
static int send_thread_wakeup( struct thread *thread, client_ptr_t cookie, int signaled )
{
struct wake_up_reply reply;
int ret;
memset( &reply, 0, sizeof(reply) );
reply.cookie = cookie;
reply.signaled = signaled;
if ((ret = write( get_unix_fd( thread->wait_fd ), &reply, sizeof(reply) )) == sizeof(reply))
return 0;
if (ret >= 0)
fatal_protocol_error( thread, "partial wakeup write %d\n", ret );
else if (errno == EPIPE)
kill_thread( thread, 0 ); /* normal death */
else
fatal_protocol_perror( thread, "write" );
return -1;
}
/* attempt to wake up a thread */
/* return >0 if OK, 0 if the wait condition is still not satisfied */
int wake_thread( struct thread *thread )
{
int signaled, count;
client_ptr_t cookie;
for (count = 0; thread->wait; count++)
{
if ((signaled = check_wait( thread )) == -1) break;
cookie = thread->wait->cookie;
if (debug_level) fprintf( stderr, "%04x: *wakeup* signaled=%d\n", thread->id, signaled );
end_wait( thread );
if (send_thread_wakeup( thread, cookie, signaled ) == -1) /* error */
break;
}
return count;
}
/* thread wait timeout */
static void thread_timeout( void *ptr )
{
struct thread_wait *wait = ptr;
struct thread *thread = wait->thread;
client_ptr_t cookie = wait->cookie;
wait->user = NULL;
if (thread->wait != wait) return; /* not the top-level wait, ignore it */
if (thread->suspend + thread->process->suspend > 0) return; /* suspended, ignore it */
if (debug_level) fprintf( stderr, "%04x: *wakeup* signaled=TIMEOUT\n", thread->id );
end_wait( thread );
if (send_thread_wakeup( thread, cookie, STATUS_TIMEOUT ) == -1) return;
/* check if other objects have become signaled in the meantime */
wake_thread( thread );
}
/* try signaling an event flag, a semaphore or a mutex */
static int signal_object( obj_handle_t handle )
{
struct object *obj;
int ret = 0;
obj = get_handle_obj( current->process, handle, 0, NULL );
if (obj)
{
ret = obj->ops->signal( obj, get_handle_access( current->process, handle ));
release_object( obj );
}
return ret;
}
/* select on a list of handles */
static timeout_t select_on( unsigned int count, client_ptr_t cookie, const obj_handle_t *handles,
int flags, timeout_t timeout, obj_handle_t signal_obj )
{
int ret;
unsigned int i;
struct object *objects[MAXIMUM_WAIT_OBJECTS];
if (timeout <= 0) timeout = current_time - timeout;
if (count > MAXIMUM_WAIT_OBJECTS)
{
set_error( STATUS_INVALID_PARAMETER );
return 0;
}
for (i = 0; i < count; i++)
{
if (!(objects[i] = get_handle_obj( current->process, handles[i], SYNCHRONIZE, NULL )))
break;
}
if (i < count) goto done;
if (!wait_on( count, objects, flags, timeout )) goto done;
/* signal the object */
if (signal_obj)
{
if (!signal_object( signal_obj ))
{
end_wait( current );
goto done;
}
/* check if we woke ourselves up */
if (!current->wait) goto done;
}
if ((ret = check_wait( current )) != -1)
{
/* condition is already satisfied */
end_wait( current );
set_error( ret );
goto done;
}
/* now we need to wait */
if (current->wait->timeout != TIMEOUT_INFINITE)
{
if (!(current->wait->user = add_timeout_user( current->wait->timeout,
thread_timeout, current->wait )))
{
end_wait( current );
goto done;
}
}
current->wait->cookie = cookie;
set_error( STATUS_PENDING );
done:
while (i > 0) release_object( objects[--i] );
return timeout;
}
/* attempt to wake threads sleeping on the object wait queue */
void wake_up( struct object *obj, int max )
{
struct list *ptr;
LIST_FOR_EACH( ptr, &obj->wait_queue )
{
struct wait_queue_entry *entry = LIST_ENTRY( ptr, struct wait_queue_entry, entry );
if (!wake_thread( entry->thread )) continue;
if (max && !--max) break;
/* restart at the head of the list since a wake up can change the object wait queue */
ptr = &obj->wait_queue;
}
}
/* return the apc queue to use for a given apc type */
static inline struct list *get_apc_queue( struct thread *thread, enum apc_type type )
{
switch(type)
{
case APC_NONE:
case APC_USER:
case APC_TIMER:
return &thread->user_apc;
default:
return &thread->system_apc;
}
}
/* check if thread is currently waiting for a (system) apc */
static inline int is_in_apc_wait( struct thread *thread )
{
return (thread->process->suspend || thread->suspend ||
(thread->wait && (thread->wait->flags & SELECT_INTERRUPTIBLE)));
}
/* queue an existing APC to a given thread */
static int queue_apc( struct process *process, struct thread *thread, struct thread_apc *apc )
{
struct list *queue;
if (!thread) /* find a suitable thread inside the process */
{
struct thread *candidate;
/* first try to find a waiting thread */
LIST_FOR_EACH_ENTRY( candidate, &process->thread_list, struct thread, proc_entry )
{
if (candidate->state == TERMINATED) continue;
if (is_in_apc_wait( candidate ))
{
thread = candidate;
break;
}
}
if (!thread)
{
/* then use the first one that accepts a signal */
LIST_FOR_EACH_ENTRY( candidate, &process->thread_list, struct thread, proc_entry )
{
if (send_thread_signal( candidate, SIGUSR1 ))
{
thread = candidate;
break;
}
}
}
if (!thread) return 0; /* nothing found */
queue = get_apc_queue( thread, apc->call.type );
}
else
{
if (thread->state == TERMINATED) return 0;
queue = get_apc_queue( thread, apc->call.type );
/* send signal for system APCs if needed */
if (queue == &thread->system_apc && list_empty( queue ) && !is_in_apc_wait( thread ))
{
if (!send_thread_signal( thread, SIGUSR1 )) return 0;
}
/* cancel a possible previous APC with the same owner */
if (apc->owner) thread_cancel_apc( thread, apc->owner, apc->call.type );
}
grab_object( apc );
list_add_tail( queue, &apc->entry );
if (!list_prev( queue, &apc->entry )) /* first one */
wake_thread( thread );
return 1;
}
/* queue an async procedure call */
int thread_queue_apc( struct thread *thread, struct object *owner, const apc_call_t *call_data )
{
struct thread_apc *apc;
int ret = 0;
if ((apc = create_apc( owner, call_data )))
{
ret = queue_apc( NULL, thread, apc );
release_object( apc );
}
return ret;
}
/* cancel the async procedure call owned by a specific object */
void thread_cancel_apc( struct thread *thread, struct object *owner, enum apc_type type )
{
struct thread_apc *apc;
struct list *queue = get_apc_queue( thread, type );
LIST_FOR_EACH_ENTRY( apc, queue, struct thread_apc, entry )
{
if (apc->owner != owner) continue;
list_remove( &apc->entry );
apc->executed = 1;
wake_up( &apc->obj, 0 );
release_object( apc );
return;
}
}
/* remove the head apc from the queue; the returned object must be released by the caller */
static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only )
{
struct thread_apc *apc = NULL;
struct list *ptr = list_head( &thread->system_apc );
if (!ptr && !system_only) ptr = list_head( &thread->user_apc );
if (ptr)
{
apc = LIST_ENTRY( ptr, struct thread_apc, entry );
list_remove( ptr );
}
return apc;
}
/* clear an APC queue, cancelling all the APCs on it */
static void clear_apc_queue( struct list *queue )
{
struct list *ptr;
while ((ptr = list_head( queue )))
{
struct thread_apc *apc = LIST_ENTRY( ptr, struct thread_apc, entry );
list_remove( &apc->entry );
apc->executed = 1;
wake_up( &apc->obj, 0 );
release_object( apc );
}
}
/* add an fd to the inflight list */
/* return list index, or -1 on error */
int thread_add_inflight_fd( struct thread *thread, int client, int server )
{
int i;
if (server == -1) return -1;
if (client == -1)
{
close( server );
return -1;
}
/* first check if we already have an entry for this fd */
for (i = 0; i < MAX_INFLIGHT_FDS; i++)
if (thread->inflight[i].client == client)
{
close( thread->inflight[i].server );
thread->inflight[i].server = server;
return i;
}
/* now find a free spot to store it */
for (i = 0; i < MAX_INFLIGHT_FDS; i++)
if (thread->inflight[i].client == -1)
{
thread->inflight[i].client = client;
thread->inflight[i].server = server;
return i;
}
return -1;
}
/* get an inflight fd and purge it from the list */
/* the fd must be closed when no longer used */
int thread_get_inflight_fd( struct thread *thread, int client )
{
int i, ret;
if (client == -1) return -1;
do
{
for (i = 0; i < MAX_INFLIGHT_FDS; i++)
{
if (thread->inflight[i].client == client)
{
ret = thread->inflight[i].server;
thread->inflight[i].server = thread->inflight[i].client = -1;
return ret;
}
}
} while (!receive_fd( thread->process )); /* in case it is still in the socket buffer */
return -1;
}
/* kill a thread on the spot */
void kill_thread( struct thread *thread, int violent_death )
{
if (thread->state == TERMINATED) return; /* already killed */
thread->state = TERMINATED;
thread->exit_time = current_time;
if (current == thread) current = NULL;
if (debug_level)
fprintf( stderr,"%04x: *killed* exit_code=%d\n",
thread->id, thread->exit_code );
if (thread->wait)
{
while (thread->wait) end_wait( thread );
send_thread_wakeup( thread, 0, STATUS_PENDING );
/* if it is waiting on the socket, we don't need to send a SIGQUIT */
violent_death = 0;
}
kill_console_processes( thread, 0 );
debug_exit_thread( thread );
abandon_mutexes( thread );
wake_up( &thread->obj, 0 );
if (violent_death) send_thread_signal( thread, SIGQUIT );
cleanup_thread( thread );
remove_process_thread( thread->process, thread );
release_object( thread );
}
/* copy parts of a context structure */
static void copy_context( context_t *to, const context_t *from, unsigned int flags )
{
assert( to->cpu == from->cpu );
to->flags |= flags;
if (flags & SERVER_CTX_CONTROL) to->ctl = from->ctl;
if (flags & SERVER_CTX_INTEGER) to->integer = from->integer;
if (flags & SERVER_CTX_SEGMENTS) to->seg = from->seg;
if (flags & SERVER_CTX_FLOATING_POINT) to->fp = from->fp;
if (flags & SERVER_CTX_DEBUG_REGISTERS) to->debug = from->debug;
if (flags & SERVER_CTX_EXTENDED_REGISTERS) to->ext = from->ext;
}
/* return the context flags that correspond to system regs */
/* (system regs are the ones we can't access on the client side) */
static unsigned int get_context_system_regs( enum cpu_type cpu )
{
switch (cpu)
{
case CPU_x86: return SERVER_CTX_DEBUG_REGISTERS;
case CPU_x86_64: return SERVER_CTX_DEBUG_REGISTERS;
case CPU_ALPHA: return 0;
case CPU_POWERPC: return 0;
case CPU_SPARC: return 0;
}
return 0;
}
/* trigger a breakpoint event in a given thread */
void break_thread( struct thread *thread )
{
debug_event_t data;
assert( thread->context );
memset( &data, 0, sizeof(data) );
data.exception.first = 1;
data.exception.exc_code = STATUS_BREAKPOINT;
data.exception.flags = EXCEPTION_CONTINUABLE;
switch (thread->context->cpu)
{
case CPU_x86:
data.exception.address = thread->context->ctl.i386_regs.eip;
break;
case CPU_x86_64:
data.exception.address = thread->context->ctl.x86_64_regs.rip;
break;
case CPU_ALPHA:
data.exception.address = thread->context->ctl.alpha_regs.fir;
break;
case CPU_POWERPC:
data.exception.address = thread->context->ctl.powerpc_regs.iar;
break;
case CPU_SPARC:
data.exception.address = thread->context->ctl.sparc_regs.pc;
break;
}
generate_debug_event( thread, EXCEPTION_DEBUG_EVENT, &data );
thread->debug_break = 0;
}
/* take a snapshot of currently running threads */
struct thread_snapshot *thread_snap( int *count )
{
struct thread_snapshot *snapshot, *ptr;
struct thread *thread;
int total = 0;
LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
if (thread->state != TERMINATED) total++;
if (!total || !(snapshot = mem_alloc( sizeof(*snapshot) * total ))) return NULL;
ptr = snapshot;
LIST_FOR_EACH_ENTRY( thread, &thread_list, struct thread, entry )
{
if (thread->state == TERMINATED) continue;
ptr->thread = thread;
ptr->count = thread->obj.refcount;
ptr->priority = thread->priority;
grab_object( thread );
ptr++;
}
*count = total;
return snapshot;
}
/* gets the current impersonation token */
struct token *thread_get_impersonation_token( struct thread *thread )
{
if (thread->token)
return thread->token;
else
return thread->process->token;
}
/* create a new thread */
DECL_HANDLER(new_thread)
{
struct thread *thread;
int request_fd = thread_get_inflight_fd( current, req->request_fd );
if (request_fd == -1 || fcntl( request_fd, F_SETFL, O_NONBLOCK ) == -1)
{
if (request_fd != -1) close( request_fd );
set_error( STATUS_INVALID_HANDLE );
return;
}
if ((thread = create_thread( request_fd, current->process )))
{
if (req->suspend) thread->suspend++;
reply->tid = get_thread_id( thread );
if ((reply->handle = alloc_handle( current->process, thread, req->access, req->attributes )))
{
/* thread object will be released when the thread gets killed */
return;
}
kill_thread( thread, 1 );
}
}
/* initialize a new thread */
DECL_HANDLER(init_thread)
{
struct process *process = current->process;
int reply_fd = thread_get_inflight_fd( current, req->reply_fd );
int wait_fd = thread_get_inflight_fd( current, req->wait_fd );
if (current->reply_fd) /* already initialised */
{
set_error( STATUS_INVALID_PARAMETER );
goto error;
}
if (reply_fd == -1 || fcntl( reply_fd, F_SETFL, O_NONBLOCK ) == -1) goto error;
current->reply_fd = create_anonymous_fd( &thread_fd_ops, reply_fd, &current->obj, 0 );
reply_fd = -1;
if (!current->reply_fd) goto error;
if (wait_fd == -1)
{
set_error( STATUS_TOO_MANY_OPENED_FILES ); /* most likely reason */
return;
}
if (!(current->wait_fd = create_anonymous_fd( &thread_fd_ops, wait_fd, &current->obj, 0 )))
return;
if (!is_valid_address(req->teb))
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
current->unix_pid = req->unix_pid;
current->unix_tid = req->unix_tid;
current->teb = req->teb;
if (!process->peb) /* first thread, initialize the process too */
{
if (!CPU_FLAG(req->cpu) || !(supported_cpus & CPU_FLAG(req->cpu)))
{
set_error( STATUS_NOT_SUPPORTED );
return;
}
process->unix_pid = current->unix_pid;
process->peb = req->entry;
process->cpu = req->cpu;
reply->info_size = init_process( current );
}
else
{
if (req->cpu != process->cpu)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (process->unix_pid != current->unix_pid)
process->unix_pid = -1; /* can happen with linuxthreads */
if (current->suspend + process->suspend > 0) stop_thread( current );
generate_debug_event( current, CREATE_THREAD_DEBUG_EVENT, &req->entry );
}
debug_level = max( debug_level, req->debug_level );
reply->pid = get_process_id( process );
reply->tid = get_thread_id( current );
reply->version = SERVER_PROTOCOL_VERSION;
reply->server_start = server_start_time;
reply->all_cpus = supported_cpus;
return;
error:
if (reply_fd != -1) close( reply_fd );
if (wait_fd != -1) close( wait_fd );
}
/* terminate a thread */
DECL_HANDLER(terminate_thread)
{
struct thread *thread;
reply->self = 0;
reply->last = 0;
if ((thread = get_thread_from_handle( req->handle, THREAD_TERMINATE )))
{
thread->exit_code = req->exit_code;
if (thread != current) kill_thread( thread, 1 );
else
{
reply->self = 1;
reply->last = (thread->process->running_threads == 1);
}
release_object( thread );
}
}
/* open a handle to a thread */
DECL_HANDLER(open_thread)
{
struct thread *thread = get_thread_from_id( req->tid );
reply->handle = 0;
if (thread)
{
reply->handle = alloc_handle( current->process, thread, req->access, req->attributes );
release_object( thread );
}
}
/* fetch information about a thread */
DECL_HANDLER(get_thread_info)
{
struct thread *thread;
obj_handle_t handle = req->handle;
if (!handle) thread = get_thread_from_id( req->tid_in );
else thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION );
if (thread)
{
reply->pid = get_process_id( thread->process );
reply->tid = get_thread_id( thread );
reply->teb = thread->teb;
reply->exit_code = (thread->state == TERMINATED) ? thread->exit_code : STATUS_PENDING;
reply->priority = thread->priority;
reply->affinity = thread->affinity;
reply->creation_time = thread->creation_time;
reply->exit_time = thread->exit_time;
reply->last = thread->process->running_threads == 1;
release_object( thread );
}
}
/* set information about a thread */
DECL_HANDLER(set_thread_info)
{
struct thread *thread;
if ((thread = get_thread_from_handle( req->handle, THREAD_SET_INFORMATION )))
{
set_thread_info( thread, req );
release_object( thread );
}
}
/* suspend a thread */
DECL_HANDLER(suspend_thread)
{
struct thread *thread;
if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
{
if (thread->state == TERMINATED) set_error( STATUS_ACCESS_DENIED );
else reply->count = suspend_thread( thread );
release_object( thread );
}
}
/* resume a thread */
DECL_HANDLER(resume_thread)
{
struct thread *thread;
if ((thread = get_thread_from_handle( req->handle, THREAD_SUSPEND_RESUME )))
{
reply->count = resume_thread( thread );
release_object( thread );
}
}
/* select on a handle list */
DECL_HANDLER(select)
{
struct thread_apc *apc;
unsigned int count;
const apc_result_t *result = get_req_data();
const obj_handle_t *handles = (const obj_handle_t *)(result + 1);
if (get_req_data_size() < sizeof(*result))
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
count = (get_req_data_size() - sizeof(*result)) / sizeof(obj_handle_t);
/* first store results of previous apc */
if (req->prev_apc)
{
if (!(apc = (struct thread_apc *)get_handle_obj( current->process, req->prev_apc,
0, &thread_apc_ops ))) return;
apc->result = *result;
apc->executed = 1;
if (apc->result.type == APC_CREATE_THREAD) /* transfer the handle to the caller process */
{
obj_handle_t handle = duplicate_handle( current->process, apc->result.create_thread.handle,
apc->caller->process, 0, 0, DUP_HANDLE_SAME_ACCESS );
close_handle( current->process, apc->result.create_thread.handle );
apc->result.create_thread.handle = handle;
clear_error(); /* ignore errors from the above calls */
}
else if (apc->result.type == APC_ASYNC_IO)
{
if (apc->owner)
async_set_result( apc->owner, apc->result.async_io.status,
apc->result.async_io.total, apc->result.async_io.apc );
}
wake_up( &apc->obj, 0 );
close_handle( current->process, req->prev_apc );
release_object( apc );
}
reply->timeout = select_on( count, req->cookie, handles, req->flags, req->timeout, req->signal );
if (get_error() == STATUS_USER_APC)
{
for (;;)
{
if (!(apc = thread_dequeue_apc( current, !(req->flags & SELECT_ALERTABLE) )))
break;
/* Optimization: ignore APC_NONE calls, they are only used to
* wake up a thread, but since we got here the thread woke up already.
*/
if (apc->call.type != APC_NONE)
{
if ((reply->apc_handle = alloc_handle( current->process, apc, SYNCHRONIZE, 0 )))
reply->call = apc->call;
release_object( apc );
break;
}
apc->executed = 1;
wake_up( &apc->obj, 0 );
release_object( apc );
}
}
}
/* queue an APC for a thread or process */
DECL_HANDLER(queue_apc)
{
struct thread *thread = NULL;
struct process *process = NULL;
struct thread_apc *apc;
if (!(apc = create_apc( NULL, &req->call ))) return;
switch (apc->call.type)
{
case APC_NONE:
case APC_USER:
thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT );
break;
case APC_VIRTUAL_ALLOC:
case APC_VIRTUAL_FREE:
case APC_VIRTUAL_PROTECT:
case APC_VIRTUAL_FLUSH:
case APC_VIRTUAL_LOCK:
case APC_VIRTUAL_UNLOCK:
case APC_UNMAP_VIEW:
process = get_process_from_handle( req->handle, PROCESS_VM_OPERATION );
break;
case APC_VIRTUAL_QUERY:
process = get_process_from_handle( req->handle, PROCESS_QUERY_INFORMATION );
break;
case APC_MAP_VIEW:
process = get_process_from_handle( req->handle, PROCESS_VM_OPERATION );
if (process && process != current->process)
{
/* duplicate the handle into the target process */
obj_handle_t handle = duplicate_handle( current->process, apc->call.map_view.handle,
process, 0, 0, DUP_HANDLE_SAME_ACCESS );
if (handle) apc->call.map_view.handle = handle;
else
{
release_object( process );
process = NULL;
}
}
break;
case APC_CREATE_THREAD:
process = get_process_from_handle( req->handle, PROCESS_CREATE_THREAD );
break;
default:
set_error( STATUS_INVALID_PARAMETER );
break;
}
if (thread)
{
if (!queue_apc( NULL, thread, apc )) set_error( STATUS_THREAD_IS_TERMINATING );
release_object( thread );
}
else if (process)
{
reply->self = (process == current->process);
if (!reply->self)
{
obj_handle_t handle = alloc_handle( current->process, apc, SYNCHRONIZE, 0 );
if (handle)
{
if (queue_apc( process, NULL, apc ))
{
apc->caller = (struct thread *)grab_object( current );
reply->handle = handle;
}
else
{
close_handle( current->process, handle );
set_error( STATUS_PROCESS_IS_TERMINATING );
}
}
}
release_object( process );
}
release_object( apc );
}
/* Get the result of an APC call */
DECL_HANDLER(get_apc_result)
{
struct thread_apc *apc;
if (!(apc = (struct thread_apc *)get_handle_obj( current->process, req->handle,
0, &thread_apc_ops ))) return;
if (!apc->executed) set_error( STATUS_PENDING );
else
{
reply->result = apc->result;
/* close the handle directly to avoid an extra round-trip */
close_handle( current->process, req->handle );
}
release_object( apc );
}
/* retrieve the current context of a thread */
DECL_HANDLER(get_thread_context)
{
struct thread *thread;
context_t *context;
if (get_reply_max_size() < sizeof(context_t))
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (!(thread = get_thread_from_handle( req->handle, THREAD_GET_CONTEXT ))) return;
if (req->suspend)
{
if (thread != current || !thread->suspend_context)
{
/* not suspended, shouldn't happen */
set_error( STATUS_INVALID_PARAMETER );
}
else
{
if (thread->context == thread->suspend_context) thread->context = NULL;
set_reply_data_ptr( thread->suspend_context, sizeof(context_t) );
thread->suspend_context = NULL;
}
}
else if (thread != current && !thread->context)
{
/* thread is not suspended, retry (if it's still running) */
if (thread->state != RUNNING) set_error( STATUS_ACCESS_DENIED );
else set_error( STATUS_PENDING );
}
else if ((context = set_reply_data_size( sizeof(context_t) )))
{
unsigned int flags = get_context_system_regs( thread->process->cpu );
memset( context, 0, sizeof(context_t) );
context->cpu = thread->process->cpu;
if (thread->context) copy_context( context, thread->context, req->flags & ~flags );
if (flags) get_thread_context( thread, context, flags );
}
reply->self = (thread == current);
release_object( thread );
}
/* set the current context of a thread */
DECL_HANDLER(set_thread_context)
{
struct thread *thread;
const context_t *context = get_req_data();
if (get_req_data_size() < sizeof(context_t))
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (!(thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT ))) return;
if (req->suspend)
{
if (thread != current || thread->context || context->cpu != thread->process->cpu)
{
/* nested suspend or exception, shouldn't happen */
set_error( STATUS_INVALID_PARAMETER );
}
else if ((thread->suspend_context = mem_alloc( sizeof(context_t) )))
{
memcpy( thread->suspend_context, get_req_data(), sizeof(context_t) );
thread->context = thread->suspend_context;
if (thread->debug_break) break_thread( thread );
}
}
else if (thread != current && !thread->context)
{
/* thread is not suspended, retry (if it's still running) */
if (thread->state != RUNNING) set_error( STATUS_ACCESS_DENIED );
else set_error( STATUS_PENDING );
}
else if (context->cpu == thread->process->cpu)
{
unsigned int system_flags = get_context_system_regs(context->cpu) & context->flags;
unsigned int client_flags = context->flags & ~system_flags;
if (system_flags) set_thread_context( thread, context, system_flags );
if (thread->context && !get_error()) copy_context( thread->context, context, client_flags );
}
else set_error( STATUS_INVALID_PARAMETER );
reply->self = (thread == current);
release_object( thread );
}
/* fetch a selector entry for a thread */
DECL_HANDLER(get_selector_entry)
{
struct thread *thread;
if ((thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION )))
{
get_selector_entry( thread, req->entry, &reply->base, &reply->limit, &reply->flags );
release_object( thread );
}
}
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