155 lines
3.9 KiB
C
155 lines
3.9 KiB
C
/*
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* Server-side event 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 <stdio.h>
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#include <stdlib.h>
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#include "winerror.h"
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#include "winnt.h"
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#include "handle.h"
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#include "thread.h"
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#include "request.h"
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struct event
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{
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struct object obj; /* object header */
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int manual_reset; /* is it a manual reset event? */
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int signaled; /* event has been signaled */
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};
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static void event_dump( struct object *obj, int verbose );
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static int event_signaled( struct object *obj, struct thread *thread );
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static int event_satisfied( struct object *obj, struct thread *thread );
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static const struct object_ops event_ops =
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{
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sizeof(struct event),
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event_dump,
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add_queue,
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remove_queue,
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event_signaled,
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event_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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no_get_file_info,
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no_destroy
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};
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static struct event *create_event( const char *name, size_t len,
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int manual_reset, int initial_state )
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{
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struct event *event;
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if ((event = create_named_object( &event_ops, name, len )))
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{
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if (get_error() != ERROR_ALREADY_EXISTS)
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{
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/* initialize it if it didn't already exist */
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event->manual_reset = manual_reset;
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event->signaled = initial_state;
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}
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}
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return event;
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}
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struct event *get_event_obj( struct process *process, int handle, unsigned int access )
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{
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return (struct event *)get_handle_obj( current->process, handle, access, &event_ops );
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}
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void pulse_event( struct event *event )
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{
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event->signaled = 1;
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/* wake up all waiters if manual reset, a single one otherwise */
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wake_up( &event->obj, !event->manual_reset );
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event->signaled = 0;
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}
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void set_event( struct event *event )
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{
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event->signaled = 1;
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/* wake up all waiters if manual reset, a single one otherwise */
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wake_up( &event->obj, !event->manual_reset );
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}
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void reset_event( struct event *event )
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{
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event->signaled = 0;
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}
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static void event_dump( struct object *obj, int verbose )
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{
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struct event *event = (struct event *)obj;
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assert( obj->ops == &event_ops );
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fprintf( stderr, "Event manual=%d signaled=%d name='%s'\n",
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event->manual_reset, event->signaled,
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get_object_name( &event->obj ) );
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}
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static int event_signaled( struct object *obj, struct thread *thread )
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{
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struct event *event = (struct event *)obj;
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assert( obj->ops == &event_ops );
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return event->signaled;
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}
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static int event_satisfied( struct object *obj, struct thread *thread )
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{
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struct event *event = (struct event *)obj;
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assert( obj->ops == &event_ops );
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/* Reset if it's an auto-reset event */
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if (!event->manual_reset) event->signaled = 0;
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return 0; /* Not abandoned */
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}
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/* create an event */
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DECL_HANDLER(create_event)
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{
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size_t len = get_req_strlen( req->name );
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struct event *event;
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req->handle = -1;
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if ((event = create_event( req->name, len, req->manual_reset, req->initial_state )))
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{
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req->handle = alloc_handle( current->process, event, EVENT_ALL_ACCESS, req->inherit );
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release_object( event );
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}
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}
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/* open a handle to an event */
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DECL_HANDLER(open_event)
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{
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size_t len = get_req_strlen( req->name );
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req->handle = open_object( req->name, len, &event_ops, req->access, req->inherit );
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}
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/* do an event operation */
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DECL_HANDLER(event_op)
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{
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struct event *event;
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if (!(event = get_event_obj( current->process, req->handle, EVENT_MODIFY_STATE ))) return;
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switch(req->op)
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{
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case PULSE_EVENT:
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pulse_event( event );
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break;
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case SET_EVENT:
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set_event( event );
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break;
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case RESET_EVENT:
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reset_event( event );
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break;
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default:
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fatal_protocol_error( current, "event_op: invalid operation %d\n", req->op );
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}
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release_object( event );
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}
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