- Add a default asynchronous I/O implementation.

server/fd.c

@@ -146,6 +146,8 @@ struct fd
     int                  unix_fd;     /* unix file descriptor */
     int                  fs_locks;    /* can we use filesystem locks for this fd? */
     int                  poll_index;  /* index of fd in poll array */
+    struct list          read_q;      /* async readers of this fd */
+    struct list          write_q;     /* async writers of this fd */
 };
 
 static void fd_dump( struct object *obj, int verbose );
@@ -1073,6 +1075,9 @@ static void fd_destroy( struct object *obj )
 {
     struct fd *fd = (struct fd *)obj;
 
+    async_terminate_queue( &fd->read_q, STATUS_CANCELLED );
+    async_terminate_queue( &fd->write_q, STATUS_CANCELLED );
+
     remove_fd_locks( fd );
     list_remove( &fd->inode_entry );
     if (fd->poll_index != -1) remove_poll_user( fd, fd->poll_index );
@@ -1126,6 +1131,8 @@ struct fd *alloc_fd( const struct fd_ops *fd_user_ops, struct object *user )
     fd->poll_index = -1;
     list_init( &fd->inode_entry );
     list_init( &fd->locks );
+    list_init( &fd->read_q );
+    list_init( &fd->write_q );
 
     if ((fd->poll_index = add_poll_user( fd )) == -1)
     {
@@ -1370,14 +1377,77 @@ int default_fd_signaled( struct object *obj, struct thread *thread )
     return ret;
 }
 
+int default_fd_get_poll_events( struct fd *fd )
+{
+    int events = 0;
+
+    if( !list_empty( &fd->read_q ))
+        events |= POLLIN;
+    if( !list_empty( &fd->write_q ))
+        events |= POLLOUT;
+
+    return events;
+}
+
 /* default handler for poll() events */
 void default_poll_event( struct fd *fd, int event )
 {
-    /* an error occurred, stop polling this fd to avoid busy-looping */
+    if (!list_empty( &fd->read_q ) && (POLLIN & event) )
+    {
+        async_terminate_head( &fd->read_q, STATUS_ALERTED );
+        return;
+    }
+    if (!list_empty( &fd->write_q ) && (POLLOUT & event) )
+    {
+        async_terminate_head( &fd->write_q, STATUS_ALERTED );
+        return;
+    }
+
+    /* if an error occurred, stop polling this fd to avoid busy-looping */
     if (event & (POLLERR | POLLHUP)) set_fd_events( fd, -1 );
     wake_up( fd->user, 0 );
 }
 
+void default_fd_queue_async( struct fd *fd, void *apc, void *user, void *io_sb, int type, int count )
+{
+    struct list *queue;
+    int events;
+
+    if (!(fd->fd_ops->get_file_info( fd ) & FD_FLAG_OVERLAPPED))
+    {
+        set_error( STATUS_INVALID_HANDLE );
+        return;
+    }
+
+    switch (type)
+    {
+    case ASYNC_TYPE_READ:
+        queue = &fd->read_q;
+        break;
+    case ASYNC_TYPE_WRITE:
+        queue = &fd->write_q;
+        break;
+    default:
+        set_error( STATUS_INVALID_PARAMETER );
+        return;
+    }
+
+    if (!create_async( current, NULL, queue, apc, user, io_sb ))
+        return;
+
+    /* Check if the new pending request can be served immediately */
+    events = check_fd_events( fd, fd->fd_ops->get_poll_events( fd ) );
+    if (events) fd->fd_ops->poll_event( fd, events );
+
+    set_fd_events( fd, fd->fd_ops->get_poll_events( fd ) );
+}
+
+void default_fd_cancel_async( struct fd *fd )
+{
+    async_terminate_queue( &fd->read_q, STATUS_CANCELLED );
+    async_terminate_queue( &fd->write_q, STATUS_CANCELLED );
+}
+
 /* default flush() routine */
 int no_flush( struct fd *fd, struct event **event )
 {

server/file.c

@@ -60,8 +60,6 @@ struct file
     struct fd          *fd;         /* file descriptor for this file */
     unsigned int        access;     /* file access (GENERIC_READ/WRITE) */
     unsigned int        options;    /* file options (FILE_DELETE_ON_CLOSE, FILE_SYNCHRONOUS...) */
-    struct list         read_q;
-    struct list         write_q;
 };
 
 static void file_dump( struct object *obj, int verbose );
@@ -69,11 +67,8 @@ static struct fd *file_get_fd( struct object *obj );
 static void file_destroy( struct object *obj );
 
 static int file_get_poll_events( struct fd *fd );
-static void file_poll_event( struct fd *fd, int event );
 static int file_flush( struct fd *fd, struct event **event );
 static int file_get_info( struct fd *fd );
-static void file_queue_async( struct fd *fd, void *apc, void *user, void* iosb, int type, int count );
-static void file_cancel_async( struct fd *fd );
 
 static const struct object_ops file_ops =
 {
@@ -91,11 +86,11 @@ static const struct object_ops file_ops =
 static const struct fd_ops file_fd_ops =
 {
     file_get_poll_events,         /* get_poll_events */
-    file_poll_event,              /* poll_event */
+    default_poll_event,           /* poll_event */
     file_flush,                   /* flush */
     file_get_info,                /* get_file_info */
-    file_queue_async,             /* queue_async */
-    file_cancel_async             /* cancel_async */
+    default_fd_queue_async,       /* queue_async */
+    default_fd_cancel_async       /* cancel_async */
 };
 
 static inline int is_overlapped( const struct file *file )
@@ -164,8 +159,6 @@ static struct object *create_file( const char *nameptr, size_t len, unsigned int
 
     file->access     = access;
     file->options    = options;
-    list_init( &file->read_q );
-    list_init( &file->write_q );
 
     /* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
     if (!(file->fd = alloc_fd( &file_fd_ops, &file->obj )) ||
@@ -233,27 +226,6 @@ static int file_get_poll_events( struct fd *fd )
     return events;
 }
 
-static void file_poll_event( struct fd *fd, int event )
-{
-    struct file *file = get_fd_user( fd );
-    assert( file->obj.ops == &file_ops );
-    if (is_overlapped( file ))
-    {
-        if (!list_empty( &file->read_q ) && (POLLIN & event) )
-        {
-            async_terminate_head( &file->read_q, STATUS_ALERTED );
-            return;
-        }
-        if (!list_empty( &file->write_q ) && (POLLOUT & event) )
-        {
-            async_terminate_head( &file->write_q, STATUS_ALERTED );
-            return;
-        }
-    }
-    default_poll_event( fd, event );
-}
-
-
 static int file_flush( struct fd *fd, struct event **event )
 {
     int ret = (fsync( get_unix_fd(fd) ) != -1);
@@ -269,53 +241,6 @@ static int file_get_info( struct fd *fd )
     else return 0;
 }
 
-static void file_queue_async( struct fd *fd, void *apc, void *user, void *iosb,
-                              int type, int count )
-{
-    struct file *file = get_fd_user( fd );
-    struct list *queue;
-    int events;
-
-    assert( file->obj.ops == &file_ops );
-
-    if (!is_overlapped( file ))
-    {
-        set_error( STATUS_INVALID_HANDLE );
-        return;
-    }
-
-    switch (type)
-    {
-    case ASYNC_TYPE_READ:
-        queue = &file->read_q;
-        break;
-    case ASYNC_TYPE_WRITE:
-        queue = &file->write_q;
-        break;
-    default:
-        set_error( STATUS_INVALID_PARAMETER );
-        return;
-    }
-
-    if (!create_async( current, NULL, queue, apc, user, iosb ))
-        return;
-
-    /* Check if the new pending request can be served immediately */
-    events = check_fd_events( fd, file_get_poll_events( fd ) );
-    if (events) file_poll_event( fd, events );
-
-    set_fd_events( fd, file_get_poll_events( fd ));
-}
-
-static void file_cancel_async( struct fd *fd )
-{
-    struct file *file = get_fd_user( fd );
-    assert( file->obj.ops == &file_ops );
-
-    async_terminate_queue( &file->read_q, STATUS_CANCELLED );
-    async_terminate_queue( &file->write_q, STATUS_CANCELLED );
-}
-
 static struct fd *file_get_fd( struct object *obj )
 {
     struct file *file = (struct file *)obj;
@@ -328,11 +253,6 @@ static void file_destroy( struct object *obj )
     struct file *file = (struct file *)obj;
     assert( obj->ops == &file_ops );
 
-    if (is_overlapped( file ))
-    {
-        async_terminate_queue( &file->read_q, STATUS_CANCELLED );
-        async_terminate_queue( &file->write_q, STATUS_CANCELLED );
-    }
     if (file->fd) release_object( file->fd );
 }
 

server/file.h

@@ -64,7 +64,10 @@ extern int flush_cached_fd( struct process *process, obj_handle_t handle );
 extern int default_fd_add_queue( struct object *obj, struct wait_queue_entry *entry );
 extern void default_fd_remove_queue( struct object *obj, struct wait_queue_entry *entry );
 extern int default_fd_signaled( struct object *obj, struct thread *thread );
+extern int default_fd_get_poll_events( struct fd *fd );
 extern void default_poll_event( struct fd *fd, int event );
+extern void default_fd_queue_async( struct fd *fd, void *apc, void *user, void *io_sb, int type, int count );
+extern void default_fd_cancel_async( struct fd *fd );
 extern int no_flush( struct fd *fd, struct event **event );
 extern int no_get_file_info( struct fd *fd );
 extern void no_queue_async( struct fd *fd, void* apc, void* user, void* io_sb, int type, int count);