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Sweden-Number/server/thread.c

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/*
* Server-side thread management
*
* Copyright (C) 1998 Alexandre Julliard
*/
#include "config.h"
#include <assert.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#include <sys/uio.h>
#include <unistd.h>
#include <stdarg.h>
#include "winbase.h"
#include "handle.h"
#include "process.h"
#include "thread.h"
#include "request.h"
/* thread queues */
struct wait_queue_entry
{
struct wait_queue_entry *next;
struct wait_queue_entry *prev;
struct object *obj;
struct thread *thread;
};
struct thread_wait
{
int count; /* count of objects */
int flags;
struct timeval timeout;
struct timeout_user *user;
sleep_reply reply; /* function to build the reply */
struct wait_queue_entry queues[1];
};
/* asynchronous procedure calls */
struct thread_apc
{
void *func; /* function to call in client */
void *param; /* function param */
};
#define MAX_THREAD_APC 16 /* Max outstanding APCs for a thread */
/* thread operations */
static void dump_thread( struct object *obj, int verbose );
static int thread_signaled( struct object *obj, struct thread *thread );
extern void thread_poll_event( struct object *obj, int event );
static void destroy_thread( struct object *obj );
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 */
NULL, /* get_poll_events */
thread_poll_event, /* poll_event */
no_read_fd, /* get_read_fd */
no_write_fd, /* get_write_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
destroy_thread /* destroy */
};
static struct thread *first_thread;
static struct thread *booting_thread;
/* allocate the buffer for the communication with the client */
static int alloc_client_buffer( struct thread *thread )
{
struct get_thread_buffer_request *req;
int fd;
if ((fd = create_anonymous_file()) == -1) return -1;
if (ftruncate( fd, MAX_REQUEST_LENGTH ) == -1) goto error;
if ((thread->buffer = mmap( 0, MAX_REQUEST_LENGTH, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0 )) == (void*)-1) goto error;
/* build the first request into the buffer and send it */
req = thread->buffer;
req->pid = get_process_id( thread->process );
req->tid = get_thread_id( thread );
req->boot = (thread == booting_thread);
req->version = SERVER_PROTOCOL_VERSION;
set_reply_fd( thread, fd );
send_reply( thread );
return 1;
error:
file_set_error();
if (fd != -1) close( fd );
return 0;
}
/* create a new thread */
struct thread *create_thread( int fd, struct process *process, int suspend )
{
struct thread *thread;
int flags = fcntl( fd, F_GETFL, 0 );
fcntl( fd, F_SETFL, flags | O_NONBLOCK );
if (!(thread = alloc_object( &thread_ops, fd ))) return NULL;
thread->unix_pid = 0; /* not known yet */
thread->context = NULL;
thread->teb = NULL;
thread->mutex = NULL;
thread->debug_ctx = NULL;
thread->wait = NULL;
thread->apc = NULL;
thread->apc_count = 0;
thread->error = 0;
thread->pass_fd = -1;
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 = (suspend != 0);
thread->buffer = (void *)-1;
thread->last_req = REQ_GET_THREAD_BUFFER;
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;
add_process_thread( process, thread );
set_select_events( &thread->obj, POLLIN ); /* start listening to events */
if (!alloc_client_buffer( thread )) goto error;
return thread;
error:
remove_process_thread( process, thread );
release_object( thread );
return NULL;
}
/* handle a client event */
void thread_poll_event( struct object *obj, int event )
{
struct thread *thread = (struct thread *)obj;
assert( obj->ops == &thread_ops );
if (event & (POLLERR | POLLHUP)) kill_thread( thread, 0 );
else
{
if (event & POLLOUT) write_request( thread );
if (event & POLLIN) read_request( thread );
}
}
/* 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 */
release_object( thread->process );
if (thread->next) thread->next->prev = thread->prev;
if (thread->prev) thread->prev->next = thread->next;
else first_thread = thread->next;
if (thread->apc) free( thread->apc );
if (thread->buffer != (void *)-1) munmap( thread->buffer, MAX_REQUEST_LENGTH );
if (thread->pass_fd != -1) close( thread->pass_fd );
}
/* 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 pid=%d teb=%p state=%d\n",
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( void *id )
{
struct thread *t = first_thread;
while (t && (t != id)) t = t->next;
if (t) grab_object( t );
return t;
}
/* get a thread from a handle (and increment the refcount) */
struct thread *get_thread_from_handle( int 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,
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;
}
/* suspend all threads but the current */
void suspend_all_threads( void )
{
struct thread *thread;
for ( thread = first_thread; thread; thread = thread->next )
if ( thread != current )
suspend_thread( thread, 0 );
}
/* resume all threads but the current */
void resume_all_threads( void )
{
struct thread *thread;
for ( thread = first_thread; thread; thread = thread->next )
if ( thread != current )
resume_thread( thread );
}
/* 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 );
free( wait );
thread->wait = NULL;
}
/* build the thread wait structure */
static int wait_on( int count, struct object *objects[], int flags,
int timeout, sleep_reply func )
{
struct thread_wait *wait;
struct wait_queue_entry *entry;
int i;
if (!(wait = mem_alloc( sizeof(*wait) + (count-1) * sizeof(*entry) ))) return 0;
current->wait = wait;
wait->count = count;
wait->flags = flags;
wait->user = NULL;
wait->reply = func;
if (flags & SELECT_TIMEOUT)
{
gettimeofday( &wait->timeout, 0 );
add_timeout( &wait->timeout, timeout );
}
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, struct object **object )
{
int i, signaled;
struct thread_wait *wait = thread->wait;
struct wait_queue_entry *entry = wait->queues;
assert( wait );
*object = NULL;
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;
*object = entry->obj;
if (entry->obj->ops->satisfied( entry->obj, thread ))
signaled = i + STATUS_ABANDONED_WAIT_0;
return signaled;
}
}
other_checks:
if ((wait->flags & SELECT_ALERTABLE) && thread->apc) 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;
}
/* build a reply to the select request */
static void build_select_reply( struct thread *thread, struct object *obj, int signaled )
{
struct select_request *req = get_req_ptr( thread );
req->signaled = signaled;
}
/* attempt to wake up a thread */
/* return 1 if OK, 0 if the wait condition is still not satisfied */
static int wake_thread( struct thread *thread )
{
int signaled;
struct object *object;
if ((signaled = check_wait( thread, &object )) == -1) return 0;
thread->error = 0;
thread->wait->reply( thread, object, signaled );
end_wait( thread );
return 1;
}
/* thread wait timeout */
static void thread_timeout( void *ptr )
{
struct thread *thread = ptr;
if (debug_level) fprintf( stderr, "%08x: *timeout*\n", (unsigned int)thread );
assert( thread->wait );
thread->error = 0;
thread->wait->user = NULL;
thread->wait->reply( thread, NULL, STATUS_TIMEOUT );
end_wait( thread );
send_reply( thread );
}
/* sleep on a list of objects */
int sleep_on( int count, struct object *objects[], int flags, int timeout, sleep_reply func )
{
assert( !current->wait );
if (!wait_on( count, objects, flags, timeout, func )) return 0;
if (wake_thread( current )) return 1;
/* now we need to wait */
if (flags & SELECT_TIMEOUT)
{
if (!(current->wait->user = add_timeout_user( &current->wait->timeout,
thread_timeout, current )))
{
end_wait( current );
return 0;
}
}
return 1;
}
/* select on a list of handles */
static int select_on( int count, int *handles, int flags, int timeout )
{
int ret = 0;
int i;
struct object *objects[MAXIMUM_WAIT_OBJECTS];
if ((count < 0) || (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) ret = sleep_on( count, objects, flags, timeout, build_select_reply );
while (--i >= 0) release_object( objects[i] );
return ret;
}
/* 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 ))
{
send_reply( thread );
if (max && !--max) break;
}
}
}
/* queue an async procedure call */
static int thread_queue_apc( struct thread *thread, void *func, void *param )
{
struct thread_apc *apc;
if (!thread->apc)
{
if (!(thread->apc = mem_alloc( MAX_THREAD_APC * sizeof(*apc) )))
return 0;
thread->apc_count = 0;
}
else if (thread->apc_count >= MAX_THREAD_APC) return 0;
thread->apc[thread->apc_count].func = func;
thread->apc[thread->apc_count].param = param;
thread->apc_count++;
if (thread->wait)
{
if (wake_thread( thread )) send_reply( thread );
}
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 || !thread->process->ldt_flags)
{
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 + 2 * entry;
if (read_thread_int( thread, addr, base ) == -1) goto done;
if (read_thread_int( thread, addr + 1, limit ) == -1) goto done;
addr = (int *)thread->process->ldt_flags + (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;
if (current == thread) current = NULL;
if (debug_level)
fprintf( stderr,"%08x: *killed* exit_code=%d\n",
(unsigned int)thread, thread->exit_code );
if (thread->wait)
{
end_wait( thread );
/* if it is waiting on the socket, we don't need to send a SIGTERM */
violent_death = 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 );
remove_select_user( &thread->obj );
release_object( thread );
}
/* signal that we are finished booting on the client side */
DECL_HANDLER(boot_done)
{
debug_level = req->debug_level;
/* Make sure last_req is initialized */
current->last_req = REQ_BOOT_DONE;
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 sock[2];
if (socketpair( AF_UNIX, SOCK_STREAM, 0, sock ) != -1)
{
if ((thread = create_thread( sock[0], current->process, req->suspend )))
{
req->tid = thread;
if ((req->handle = alloc_handle( current->process, thread,
THREAD_ALL_ACCESS, req->inherit )) != -1)
{
set_reply_fd( current, sock[1] );
/* thread object will be released when the thread gets killed */
return;
}
release_object( thread );
}
close( sock[1] );
}
else file_set_error();
}
/* retrieve the thread buffer file descriptor */
DECL_HANDLER(get_thread_buffer)
{
fatal_protocol_error( current, "get_thread_buffer: should never get called directly\n" );
}
/* initialize a new thread */
DECL_HANDLER(init_thread)
{
if (current->unix_pid)
{
fatal_protocol_error( current, "init_thread: already running\n" );
return;
}
current->unix_pid = req->unix_pid;
current->teb = req->teb;
current->entry = req->entry;
if (current->suspend + current->process->suspend > 0) stop_thread( current );
if (current->process->running_threads > 1)
generate_debug_event( current, CREATE_THREAD_DEBUG_EVENT, current );
}
/* terminate a thread */
DECL_HANDLER(terminate_thread)
{
struct thread *thread;
req->self = 0;
req->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
{
req->self = 1;
req->last = (thread->process->running_threads == 1);
}
release_object( thread );
}
}
/* fetch information about a thread */
DECL_HANDLER(get_thread_info)
{
struct thread *thread;
if ((thread = get_thread_from_handle( req->handle, THREAD_QUERY_INFORMATION )))
{
req->tid = thread;
req->exit_code = (thread->state == TERMINATED) ? thread->exit_code : STILL_ACTIVE;
req->priority = thread->priority;
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 )))
{
req->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 )))
{
req->count = resume_thread( thread );
release_object( thread );
}
}
/* select on a handle list */
DECL_HANDLER(select)
{
if (!select_on( req->count, req->handles, req->flags, req->timeout ))
req->signaled = -1;
}
/* 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, req->func, req->param );
release_object( thread );
}
}
/* get list of APC to call */
DECL_HANDLER(get_apcs)
{
if ((req->count = current->apc_count))
{
memcpy( req->apcs, current->apc, current->apc_count * sizeof(*current->apc) );
free( current->apc );
current->apc = NULL;
current->apc_count = 0;
}
}
/* 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, &req->base, &req->limit, &req->flags );
release_object( thread );
}
}
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