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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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>
#include "winbase.h"
#include "file.h"
#include "handle.h"
#include "process.h"
#include "thread.h"
#include "request.h"
#include "user.h"
/* 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;
void *cookie; /* magic cookie to return to client */
struct timeval timeout;
struct timeout_user *user;
struct wait_queue_entry queues[1];
};
/* asynchronous procedure calls */
struct thread_apc
{
struct thread_apc *next; /* queue linked list */
struct thread_apc *prev;
struct object *owner; /* object that queued this apc */
void *func; /* function to call in client */
enum apc_type type; /* type of apc function */
int nb_args; /* number of arguments */
void *args[1]; /* function arguments */
};
/* thread operations */
static void dump_thread( struct object *obj, int verbose );
static int thread_signaled( struct object *obj, struct thread *thread );
static void thread_poll_event( struct fd *fd, int event );
static void destroy_thread( struct object *obj );
static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only );
static const struct object_ops thread_ops =
{
sizeof(struct thread), /* size */
dump_thread, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
thread_signaled, /* signaled */
no_satisfied, /* satisfied */
no_get_fd, /* get_fd */
destroy_thread /* destroy */
};
static const struct fd_ops thread_fd_ops =
{
NULL, /* get_poll_events */
thread_poll_event, /* poll_event */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
no_queue_async /* queue_async */
};
static struct thread *first_thread;
static struct thread *booting_thread;
/* initialize the structure for a newly allocated thread */
inline static void init_thread_structure( struct thread *thread )
{
int i;
thread->unix_pid = 0; /* not known yet */
thread->context = NULL;
thread->teb = NULL;
thread->mutex = NULL;
thread->debug_ctx = NULL;
thread->debug_event = NULL;
thread->queue = NULL;
thread->hooks = NULL;
thread->wait = NULL;
thread->system_apc.head = NULL;
thread->system_apc.tail = NULL;
thread->user_apc.head = NULL;
thread->user_apc.tail = 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->attached = 0;
thread->exit_code = 0;
thread->next = NULL;
thread->prev = NULL;
thread->priority = THREAD_PRIORITY_NORMAL;
thread->affinity = 1;
thread->suspend = 0;
thread->creation_time = time(NULL);
thread->exit_time = 0;
for (i = 0; i < MAX_INFLIGHT_FDS; i++)
thread->inflight[i].server = thread->inflight[i].client = -1;
}
/* 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 );
if (!current) current = thread;
if (!booting_thread) /* first thread ever */
{
booting_thread = thread;
lock_master_socket(1);
}
if ((thread->next = first_thread) != NULL) thread->next->prev = thread;
first_thread = thread;
if (!(thread->id = alloc_ptid( thread )))
{
release_object( thread );
return NULL;
}
if (!(thread->request_fd = alloc_fd( &thread_fd_ops, fd, &thread->obj )))
{
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;
struct thread_apc *apc;
while ((apc = thread_dequeue_apc( thread, 0 ))) free( apc );
if (thread->req_data) free( thread->req_data );
if (thread->reply_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 );
if (thread->hooks) release_object( thread->hooks );
free_msg_queue( thread );
destroy_thread_windows( 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->hooks = NULL;
if (thread == booting_thread) /* killing booting thread */
{
booting_thread = NULL;
lock_master_socket(0);
}
}
/* destroy a thread when its refcount is 0 */
static void destroy_thread( struct object *obj )
{
struct thread_apc *apc;
struct thread *thread = (struct thread *)obj;
assert( obj->ops == &thread_ops );
assert( !thread->debug_ctx ); /* cannot still be debugging something */
if (thread->next) thread->next->prev = thread->prev;
if (thread->prev) thread->prev->next = thread->next;
else first_thread = thread->next;
while ((apc = thread_dequeue_apc( thread, 0 ))) free( apc );
cleanup_thread( thread );
release_object( thread->process );
if (thread->id) free_ptid( thread->id );
}
/* 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 teb=%p state=%d\n",
thread->id, thread->unix_pid, thread->teb, thread->state );
}
static int thread_signaled( struct object *obj, struct thread *thread )
{
struct thread *mythread = (struct thread *)obj;
return (mythread->state == TERMINATED);
}
/* 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_PARAMETER );
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 pid */
struct thread *get_thread_from_pid( int pid )
{
struct thread *t = first_thread;
while (t && (t->unix_pid != pid)) t = t->next;
return t;
}
/* 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)
thread->priority = req->priority;
if (req->mask & SET_THREAD_INFO_AFFINITY)
{
if (req->affinity != 1) set_error( STATUS_INVALID_PARAMETER );
else thread->affinity = req->affinity;
}
}
/* suspend a thread */
int suspend_thread( struct thread *thread, int check_limit )
{
int old_count = thread->suspend;
if (thread->suspend < MAXIMUM_SUSPEND_COUNT || !check_limit)
{
if (!(thread->process->suspend + thread->suspend++)) stop_thread( thread );
}
else set_error( STATUS_SUSPEND_COUNT_EXCEEDED );
return old_count;
}
/* resume a thread */
int resume_thread( struct thread *thread )
{
int old_count = thread->suspend;
if (thread->suspend > 0)
{
if (!(--thread->suspend + thread->process->suspend)) continue_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;
entry->prev = obj->tail;
entry->next = NULL;
if (obj->tail) obj->tail->next = entry;
else obj->head = entry;
obj->tail = entry;
return 1;
}
/* remove a thread from an object wait queue */
void remove_queue( struct object *obj, struct wait_queue_entry *entry )
{
if (entry->next) entry->next->prev = entry->prev;
else obj->tail = entry->prev;
if (entry->prev) entry->prev->next = entry->next;
else obj->head = entry->next;
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 );
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 );
thread->wait = wait->next;
free( wait );
}
/* build the thread wait structure */
static int wait_on( int count, struct object *objects[], int flags, int sec, int usec )
{
struct thread_wait *wait;
struct wait_queue_entry *entry;
int i;
if (!(wait = mem_alloc( sizeof(*wait) + (count-1) * sizeof(*entry) ))) return 0;
wait->next = current->wait;
wait->thread = current;
wait->count = count;
wait->flags = flags;
wait->user = NULL;
current->wait = wait;
if (flags & SELECT_TIMEOUT)
{
wait->timeout.tv_sec = sec;
wait->timeout.tv_usec = usec;
}
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_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_INTERRUPTIBLE) && thread->system_apc.head) return STATUS_USER_APC;
if ((wait->flags & SELECT_ALERTABLE) && thread->user_apc.head) return STATUS_USER_APC;
if (wait->flags & SELECT_TIMEOUT)
{
struct timeval now;
gettimeofday( &now, NULL );
if (!time_before( &now, &wait->timeout )) return STATUS_TIMEOUT;
}
return -1;
}
/* send the wakeup signal to a thread */
static int send_thread_wakeup( struct thread *thread, void *cookie, int signaled )
{
struct wake_up_reply reply;
int ret;
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 */
static int wake_thread( struct thread *thread )
{
int signaled, count;
void *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 cookie=%p\n",
thread->id, signaled, cookie );
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;
void *cookie = wait->cookie;
wait->user = NULL;
if (thread->wait != wait) return; /* not the top-level wait, ignore it */
if (debug_level) fprintf( stderr, "%04x: *wakeup* signaled=%d cookie=%p\n",
thread->id, STATUS_TIMEOUT, cookie );
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 );
}
/* select on a list of handles */
static void select_on( int count, void *cookie, const obj_handle_t *handles,
int flags, int sec, int usec )
{
int ret, i;
struct object *objects[MAXIMUM_WAIT_OBJECTS];
if ((count < 0) || (count > MAXIMUM_WAIT_OBJECTS))
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
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, sec, usec )) 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 (flags & SELECT_TIMEOUT)
{
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] );
}
/* attempt to wake threads sleeping on the object wait queue */
void wake_up( struct object *obj, int max )
{
struct wait_queue_entry *entry = obj->head;
while (entry)
{
struct thread *thread = entry->thread;
entry = entry->next;
if (wake_thread( thread ))
{
if (max && !--max) break;
}
}
}
/* queue an async procedure call */
int thread_queue_apc( struct thread *thread, struct object *owner, void *func,
enum apc_type type, int system, int nb_args, ... )
{
struct thread_apc *apc;
struct apc_queue *queue = system ? &thread->system_apc : &thread->user_apc;
/* cancel a possible previous APC with the same owner */
if (owner) thread_cancel_apc( thread, owner, system );
if (thread->state == TERMINATED) return 0;
if (!(apc = mem_alloc( sizeof(*apc) + (nb_args-1)*sizeof(apc->args[0]) ))) return 0;
apc->prev = queue->tail;
apc->next = NULL;
apc->owner = owner;
apc->func = func;
apc->type = type;
apc->nb_args = nb_args;
if (nb_args)
{
int i;
va_list args;
va_start( args, nb_args );
for (i = 0; i < nb_args; i++) apc->args[i] = va_arg( args, void * );
va_end( args );
}
queue->tail = apc;
if (!apc->prev) /* first one */
{
queue->head = apc;
wake_thread( thread );
}
else apc->prev->next = apc;
return 1;
}
/* cancel the async procedure call owned by a specific object */
void thread_cancel_apc( struct thread *thread, struct object *owner, int system )
{
struct thread_apc *apc;
struct apc_queue *queue = system ? &thread->system_apc : &thread->user_apc;
for (apc = queue->head; apc; apc = apc->next)
{
if (apc->owner != owner) continue;
if (apc->next) apc->next->prev = apc->prev;
else queue->tail = apc->prev;
if (apc->prev) apc->prev->next = apc->next;
else queue->head = apc->next;
free( apc );
return;
}
}
/* remove the head apc from the queue; the returned pointer must be freed by the caller */
static struct thread_apc *thread_dequeue_apc( struct thread *thread, int system_only )
{
struct thread_apc *apc;
struct apc_queue *queue = &thread->system_apc;
if (!queue->head && !system_only) queue = &thread->user_apc;
if ((apc = queue->head))
{
if (apc->next) apc->next->prev = NULL;
else queue->tail = NULL;
queue->head = apc->next;
}
return 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;
}
/* retrieve an LDT selector entry */
static void get_selector_entry( struct thread *thread, int entry,
unsigned int *base, unsigned int *limit,
unsigned char *flags )
{
if (!thread->process->ldt_copy)
{
set_error( STATUS_ACCESS_DENIED );
return;
}
if (entry >= 8192)
{
set_error( STATUS_INVALID_PARAMETER ); /* FIXME */
return;
}
if (suspend_for_ptrace( thread ))
{
unsigned char flags_buf[4];
int *addr = (int *)thread->process->ldt_copy + entry;
if (read_thread_int( thread, addr, base ) == -1) goto done;
if (read_thread_int( thread, addr + 8192, limit ) == -1) goto done;
addr = (int *)thread->process->ldt_copy + 2*8192 + (entry >> 2);
if (read_thread_int( thread, addr, (int *)flags_buf ) == -1) goto done;
*flags = flags_buf[entry & 3];
done:
resume_thread( thread );
}
}
/* 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 = time(NULL);
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, NULL, STATUS_PENDING );
/* if it is waiting on the socket, we don't need to send a SIGTERM */
violent_death = 0;
}
kill_console_processes( thread, 0 );
debug_exit_thread( thread );
abandon_mutexes( thread );
remove_process_thread( thread->process, thread );
wake_up( &thread->obj, 0 );
detach_thread( thread, violent_death ? SIGTERM : 0 );
cleanup_thread( thread );
release_object( thread );
}
/* 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;
for (thread = first_thread; thread; thread = thread->next)
if (thread->state != TERMINATED) total++;
if (!total || !(snapshot = mem_alloc( sizeof(*snapshot) * total ))) return NULL;
ptr = snapshot;
for (thread = first_thread; thread; thread = thread->next)
{
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;
}
/* signal that we are finished booting on the client side */
DECL_HANDLER(boot_done)
{
debug_level = max( debug_level, req->debug_level );
if (current == booting_thread)
{
booting_thread = (struct thread *)~0UL; /* make sure it doesn't match other threads */
lock_master_socket(0); /* allow other clients now */
}
}
/* 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,
THREAD_ALL_ACCESS, req->inherit )))
{
/* thread object will be released when the thread gets killed */
return;
}
kill_thread( thread, 1 );
}
}
/* initialize a new thread */
DECL_HANDLER(init_thread)
{
int reply_fd = thread_get_inflight_fd( current, req->reply_fd );
int wait_fd = thread_get_inflight_fd( current, req->wait_fd );
if (current->unix_pid)
{
fatal_protocol_error( current, "init_thread: already running\n" );
goto error;
}
if (reply_fd == -1 || fcntl( reply_fd, F_SETFL, O_NONBLOCK ) == -1)
{
fatal_protocol_error( current, "bad reply fd\n" );
goto error;
}
if (wait_fd == -1)
{
fatal_protocol_error( current, "bad wait fd\n" );
goto error;
}
current->reply_fd = alloc_fd( &thread_fd_ops, reply_fd, &current->obj );
current->wait_fd = alloc_fd( &thread_fd_ops, wait_fd, &current->obj );
if (!current->reply_fd || !current->wait_fd) return;
current->unix_pid = req->unix_pid;
current->teb = req->teb;
if (current->suspend + current->process->suspend > 0) stop_thread( current );
if (current->process->running_threads > 1)
generate_debug_event( current, CREATE_THREAD_DEBUG_EVENT, req->entry );
reply->pid = get_process_id( current->process );
reply->tid = get_thread_id( current );
reply->boot = (current == booting_thread);
reply->version = SERVER_PROTOCOL_VERSION;
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->inherit );
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->tid = get_thread_id( thread );
reply->teb = thread->teb;
reply->exit_code = (thread->state == TERMINATED) ? thread->exit_code : STILL_ACTIVE;
reply->priority = thread->priority;
reply->creation_time = thread->creation_time;
reply->exit_time = thread->exit_time;
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, 1 );
release_object( thread );
}
}
/* resume a thread */
DECL_HANDLER(resume_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 = resume_thread( thread );
release_object( thread );
}
}
/* select on a handle list */
DECL_HANDLER(select)
{
int count = get_req_data_size() / sizeof(int);
select_on( count, req->cookie, get_req_data(), req->flags, req->sec, req->usec );
}
/* queue an APC for a thread */
DECL_HANDLER(queue_apc)
{
struct thread *thread;
if ((thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT )))
{
thread_queue_apc( thread, NULL, req->func, APC_USER, !req->user, 1, req->param );
release_object( thread );
}
}
/* get next APC to call */
DECL_HANDLER(get_apc)
{
struct thread_apc *apc;
size_t size;
for (;;)
{
if (!(apc = thread_dequeue_apc( current, !req->alertable )))
{
/* no more APCs */
reply->func = NULL;
reply->type = APC_NONE;
return;
}
/* Optimization: ignore APCs that have a NULL func; they are only used
* to wake up a thread, but since we got here the thread woke up already.
* Exception: for APC_ASYNC_IO, func == NULL is legal.
*/
if (apc->func || apc->type == APC_ASYNC_IO) break;
free( apc );
}
size = apc->nb_args * sizeof(apc->args[0]);
if (size > get_reply_max_size()) size = get_reply_max_size();
reply->func = apc->func;
reply->type = apc->type;
set_reply_data( apc->args, size );
free( apc );
}
/* 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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