417 lines
11 KiB
C
417 lines
11 KiB
C
/*
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* Server-side thread management
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*
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* Copyright (C) 1998 Alexandre Julliard
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*/
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#include <assert.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#include "winnt.h"
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#include "winerror.h"
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#include "server.h"
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#include "server/thread.h"
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/* thread queues */
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struct wait_queue_entry
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{
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struct wait_queue_entry *next;
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struct wait_queue_entry *prev;
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struct object *obj;
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struct thread *thread;
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};
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struct thread_wait
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{
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int count; /* count of objects */
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int flags;
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struct timeval timeout;
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struct wait_queue_entry queues[1];
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};
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/* thread operations */
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static void dump_thread( struct object *obj, int verbose );
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static int thread_signaled( struct object *obj, struct thread *thread );
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static void destroy_thread( struct object *obj );
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static const struct object_ops thread_ops =
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{
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dump_thread,
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add_queue,
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remove_queue,
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thread_signaled,
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no_satisfied,
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no_read_fd,
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no_write_fd,
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no_flush,
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destroy_thread
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};
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static struct thread *first_thread;
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/* create a new thread */
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struct thread *create_thread( int fd, void *pid, int *thread_handle,
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int *process_handle )
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{
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struct thread *thread;
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struct process *process;
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if (!(thread = mem_alloc( sizeof(*thread) ))) return NULL;
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if (pid) process = get_process_from_id( pid );
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else process = create_process();
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if (!process)
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{
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free( thread );
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return NULL;
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}
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init_object( &thread->obj, &thread_ops, NULL );
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thread->client_fd = fd;
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thread->process = process;
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thread->unix_pid = 0; /* not known yet */
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thread->name = NULL;
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thread->mutex = NULL;
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thread->wait = NULL;
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thread->error = 0;
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thread->state = STARTING;
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thread->exit_code = 0x103; /* STILL_ACTIVE */
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thread->next = first_thread;
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thread->prev = NULL;
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if (first_thread) first_thread->prev = thread;
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first_thread = thread;
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add_process_thread( process, thread );
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*thread_handle = *process_handle = -1;
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if (current)
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{
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if ((*thread_handle = alloc_handle( current->process, thread,
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THREAD_ALL_ACCESS, 0 )) == -1)
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goto error;
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}
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if (current && !pid)
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{
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if ((*process_handle = alloc_handle( current->process, process,
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PROCESS_ALL_ACCESS, 0 )) == -1)
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goto error;
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}
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if (add_client( fd, thread ) == -1) goto error;
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return thread;
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error:
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if (current)
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{
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close_handle( current->process, *thread_handle );
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close_handle( current->process, *process_handle );
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}
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remove_process_thread( process, thread );
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release_object( thread );
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return NULL;
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}
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/* destroy a thread when its refcount is 0 */
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static void destroy_thread( struct object *obj )
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{
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struct thread *thread = (struct thread *)obj;
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assert( obj->ops == &thread_ops );
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release_object( thread->process );
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if (thread->next) thread->next->prev = thread->prev;
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if (thread->prev) thread->prev->next = thread->next;
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else first_thread = thread->next;
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if (thread->name) free( thread->name );
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if (debug_level) memset( thread, 0xaa, sizeof(thread) ); /* catch errors */
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free( thread );
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}
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/* dump a thread on stdout for debugging purposes */
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static void dump_thread( struct object *obj, int verbose )
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{
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struct thread *thread = (struct thread *)obj;
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assert( obj->ops == &thread_ops );
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printf( "Thread pid=%d fd=%d name='%s'\n",
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thread->unix_pid, thread->client_fd, thread->name );
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}
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static int thread_signaled( struct object *obj, struct thread *thread )
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{
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struct thread *mythread = (struct thread *)obj;
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return (mythread->state == TERMINATED);
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}
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/* get a thread pointer from a thread id (and increment the refcount) */
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struct thread *get_thread_from_id( void *id )
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{
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struct thread *t = first_thread;
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while (t && (t != id)) t = t->next;
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if (t) grab_object( t );
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return t;
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}
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/* get a thread from a handle (and increment the refcount) */
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struct thread *get_thread_from_handle( int handle, unsigned int access )
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{
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return (struct thread *)get_handle_obj( current->process, handle,
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access, &thread_ops );
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}
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/* get all information about a thread */
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void get_thread_info( struct thread *thread,
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struct get_thread_info_reply *reply )
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{
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reply->pid = thread;
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reply->exit_code = thread->exit_code;
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}
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/* send a reply to a thread */
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int send_reply( struct thread *thread, int pass_fd, int n,
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... /* arg_1, len_1, ..., arg_n, len_n */ )
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{
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struct iovec vec[16];
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va_list args;
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int i;
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assert( n < 16 );
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va_start( args, n );
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for (i = 0; i < n; i++)
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{
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vec[i].iov_base = va_arg( args, void * );
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vec[i].iov_len = va_arg( args, int );
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}
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va_end( args );
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return send_reply_v( thread->client_fd, thread->error, pass_fd, vec, n );
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}
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/* add a thread to an object wait queue; return 1 if OK, 0 on error */
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int add_queue( struct object *obj, struct wait_queue_entry *entry )
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{
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grab_object( obj );
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entry->obj = obj;
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entry->prev = obj->tail;
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entry->next = NULL;
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if (obj->tail) obj->tail->next = entry;
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else obj->head = entry;
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obj->tail = entry;
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return 1;
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}
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/* remove a thread from an object wait queue */
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void remove_queue( struct object *obj, struct wait_queue_entry *entry )
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{
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if (entry->next) entry->next->prev = entry->prev;
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else obj->tail = entry->prev;
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if (entry->prev) entry->prev->next = entry->next;
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else obj->head = entry->next;
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release_object( obj );
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}
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/* finish waiting */
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static void end_wait( struct thread *thread )
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{
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struct thread_wait *wait = thread->wait;
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struct wait_queue_entry *entry;
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int i;
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assert( wait );
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for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
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entry->obj->ops->remove_queue( entry->obj, entry );
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if (wait->flags & SELECT_TIMEOUT) set_select_timeout( thread->client_fd, NULL );
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free( wait );
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thread->wait = NULL;
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}
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/* build the thread wait structure */
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static int wait_on( struct thread *thread, int count,
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int *handles, int flags, int timeout )
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{
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struct thread_wait *wait;
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struct wait_queue_entry *entry;
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struct object *obj;
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int i;
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if ((count < 0) || (count > MAXIMUM_WAIT_OBJECTS))
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{
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SET_ERROR( ERROR_INVALID_PARAMETER );
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return 0;
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}
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if (!(wait = mem_alloc( sizeof(*wait) + (count-1) * sizeof(*entry) ))) return 0;
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thread->wait = wait;
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wait->count = count;
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wait->flags = flags;
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if (flags & SELECT_TIMEOUT)
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{
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gettimeofday( &wait->timeout, 0 );
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if (timeout)
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{
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wait->timeout.tv_usec += (timeout % 1000) * 1000;
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if (wait->timeout.tv_usec >= 1000000)
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{
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wait->timeout.tv_usec -= 1000000;
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wait->timeout.tv_sec++;
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}
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wait->timeout.tv_sec += timeout / 1000;
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}
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}
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for (i = 0, entry = wait->queues; i < count; i++, entry++)
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{
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if (!(obj = get_handle_obj( thread->process, handles[i],
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SYNCHRONIZE, NULL )))
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{
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wait->count = i - 1;
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end_wait( thread );
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return 0;
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}
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entry->thread = thread;
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if (!obj->ops->add_queue( obj, entry ))
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{
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wait->count = i - 1;
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end_wait( thread );
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return 0;
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}
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release_object( obj );
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}
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return 1;
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}
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/* check if the thread waiting condition is satisfied */
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static int check_wait( struct thread *thread, int *signaled )
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{
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int i;
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struct thread_wait *wait = thread->wait;
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struct wait_queue_entry *entry = wait->queues;
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struct timeval now;
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assert( wait );
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if (wait->flags & SELECT_ALL)
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{
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for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
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if (!entry->obj->ops->signaled( entry->obj, thread )) goto check_timeout;
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/* Wait satisfied: tell it to all objects */
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*signaled = 0;
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for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
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if (entry->obj->ops->satisfied( entry->obj, thread ))
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*signaled = STATUS_ABANDONED_WAIT_0;
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return 1;
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}
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else
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{
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for (i = 0, entry = wait->queues; i < wait->count; i++, entry++)
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{
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if (!entry->obj->ops->signaled( entry->obj, thread )) continue;
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/* Wait satisfied: tell it to the object */
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*signaled = i;
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if (entry->obj->ops->satisfied( entry->obj, thread ))
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*signaled += STATUS_ABANDONED_WAIT_0;
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return 1;
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}
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}
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check_timeout:
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if (!(wait->flags & SELECT_TIMEOUT)) return 0;
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gettimeofday( &now, NULL );
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if ((now.tv_sec > wait->timeout.tv_sec) ||
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((now.tv_sec == wait->timeout.tv_sec) &&
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(now.tv_usec >= wait->timeout.tv_usec)))
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{
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*signaled = STATUS_TIMEOUT;
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return 1;
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}
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return 0;
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}
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/* sleep on a list of objects */
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void sleep_on( struct thread *thread, int count, int *handles, int flags, int timeout )
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{
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struct select_reply reply;
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assert( !thread->wait );
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reply.signaled = -1;
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if (!wait_on( thread, count, handles, flags, timeout )) goto done;
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if (!check_wait( thread, &reply.signaled ))
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{
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/* we need to wait */
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if (flags & SELECT_TIMEOUT)
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set_select_timeout( thread->client_fd, &thread->wait->timeout );
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return;
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}
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end_wait( thread );
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done:
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send_reply( thread, -1, 1, &reply, sizeof(reply) );
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}
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/* attempt to wake up a thread */
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/* return 1 if OK, 0 if the wait condition is still not satisfied */
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static int wake_thread( struct thread *thread )
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{
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struct select_reply reply;
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if (!check_wait( thread, &reply.signaled )) return 0;
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end_wait( thread );
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send_reply( thread, -1, 1, &reply, sizeof(reply) );
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return 1;
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}
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/* timeout for the current thread */
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void thread_timeout(void)
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{
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struct select_reply reply;
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assert( current->wait );
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reply.signaled = STATUS_TIMEOUT;
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end_wait( current );
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send_reply( current, -1, 1, &reply, sizeof(reply) );
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}
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/* attempt to wake threads sleeping on the object wait queue */
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void wake_up( struct object *obj, int max )
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{
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struct wait_queue_entry *entry = obj->head;
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while (entry)
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{
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struct wait_queue_entry *next = entry->next;
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if (wake_thread( entry->thread ))
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{
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if (max && !--max) break;
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}
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entry = next;
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}
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}
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/* kill a thread on the spot */
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void kill_thread( struct thread *thread, int exit_code )
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{
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if (thread->state == TERMINATED) return; /* already killed */
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if (thread->unix_pid) kill( thread->unix_pid, SIGTERM );
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remove_client( thread->client_fd, exit_code ); /* this will call thread_killed */
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}
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/* a thread has been killed */
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void thread_killed( struct thread *thread, int exit_code )
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{
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thread->state = TERMINATED;
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thread->exit_code = exit_code;
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if (thread->wait) end_wait( thread );
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abandon_mutexes( thread );
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remove_process_thread( thread->process, thread );
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wake_up( &thread->obj, 0 );
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release_object( thread );
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}
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