Sweden-Number/server/event.c

155 lines
3.9 KiB
C

/*
* Server-side event management
*
* Copyright (C) 1998 Alexandre Julliard
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "winerror.h"
#include "winnt.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
struct event
{
struct object obj; /* object header */
int manual_reset; /* is it a manual reset event? */
int signaled; /* event has been signaled */
};
static void event_dump( struct object *obj, int verbose );
static int event_signaled( struct object *obj, struct thread *thread );
static int event_satisfied( struct object *obj, struct thread *thread );
static const struct object_ops event_ops =
{
sizeof(struct event),
event_dump,
add_queue,
remove_queue,
event_signaled,
event_satisfied,
no_read_fd,
no_write_fd,
no_flush,
no_get_file_info,
no_destroy
};
static struct event *create_event( const char *name, size_t len,
int manual_reset, int initial_state )
{
struct event *event;
if ((event = create_named_object( &event_ops, name, len )))
{
if (get_error() != ERROR_ALREADY_EXISTS)
{
/* initialize it if it didn't already exist */
event->manual_reset = manual_reset;
event->signaled = initial_state;
}
}
return event;
}
struct event *get_event_obj( struct process *process, int handle, unsigned int access )
{
return (struct event *)get_handle_obj( current->process, handle, access, &event_ops );
}
void pulse_event( struct event *event )
{
event->signaled = 1;
/* wake up all waiters if manual reset, a single one otherwise */
wake_up( &event->obj, !event->manual_reset );
event->signaled = 0;
}
void set_event( struct event *event )
{
event->signaled = 1;
/* wake up all waiters if manual reset, a single one otherwise */
wake_up( &event->obj, !event->manual_reset );
}
void reset_event( struct event *event )
{
event->signaled = 0;
}
static void event_dump( struct object *obj, int verbose )
{
struct event *event = (struct event *)obj;
assert( obj->ops == &event_ops );
fprintf( stderr, "Event manual=%d signaled=%d name='%s'\n",
event->manual_reset, event->signaled,
get_object_name( &event->obj ) );
}
static int event_signaled( struct object *obj, struct thread *thread )
{
struct event *event = (struct event *)obj;
assert( obj->ops == &event_ops );
return event->signaled;
}
static int event_satisfied( struct object *obj, struct thread *thread )
{
struct event *event = (struct event *)obj;
assert( obj->ops == &event_ops );
/* Reset if it's an auto-reset event */
if (!event->manual_reset) event->signaled = 0;
return 0; /* Not abandoned */
}
/* create an event */
DECL_HANDLER(create_event)
{
size_t len = get_req_strlen( req->name );
struct event *event;
req->handle = -1;
if ((event = create_event( req->name, len, req->manual_reset, req->initial_state )))
{
req->handle = alloc_handle( current->process, event, EVENT_ALL_ACCESS, req->inherit );
release_object( event );
}
}
/* open a handle to an event */
DECL_HANDLER(open_event)
{
size_t len = get_req_strlen( req->name );
req->handle = open_object( req->name, len, &event_ops, req->access, req->inherit );
}
/* do an event operation */
DECL_HANDLER(event_op)
{
struct event *event;
if (!(event = get_event_obj( current->process, req->handle, EVENT_MODIFY_STATE ))) return;
switch(req->op)
{
case PULSE_EVENT:
pulse_event( event );
break;
case SET_EVENT:
set_event( event );
break;
case RESET_EVENT:
reset_event( event );
break;
default:
fatal_protocol_error( current, "event_op: invalid operation %d\n", req->op );
}
release_object( event );
}