Rémi Bernon : server: Keep a list of threads connected to each desktop.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: f7303cf7b6f57c7b0baa1dc4f1a1f600d5ce0f61
URL:    https://gitlab.winehq.org/wine/wine/-/commit/f7303cf7b6f57c7b0baa1dc4f1a1f60...

Author: Rémi Bernon 
Date:   Sat Jan 27 22:00:12 2024 +0100

server: Keep a list of threads connected to each desktop.

---

server/thread.h     |  1 +
 server/user.h       |  1 +
 server/winstation.c | 53 +++++++++++++++++++++++++++++++----------------------
 3 files changed, 33 insertions(+), 22 deletions(-)

diff --git a/server/thread.h b/server/thread.h
index 8dcf966a90a..766ed78a72f 100644
--- a/server/thread.h
+++ b/server/thread.h
@@ -51,6 +51,7 @@ struct thread
     struct object          obj;           /* object header */
     struct list            entry;         /* entry in system-wide thread list */
     struct list            proc_entry;    /* entry in per-process thread list */
+    struct list            desktop_entry; /* entry in per-desktop thread list */
     struct process        *process;
     thread_id_t            id;            /* thread id */
     struct list            mutex_list;    /* list of currently owned mutexes */
diff --git a/server/user.h b/server/user.h
index 1acd0638520..c3ca90d5a77 100644
--- a/server/user.h
+++ b/server/user.h
@@ -70,6 +70,7 @@ struct desktop
     struct winstation   *winstation;       /* winstation this desktop belongs to */
     timeout_t            input_time;       /* last time this desktop had the input */
     struct list          entry;            /* entry in winstation list of desktops */
+    struct list          threads;          /* list of threads connected to this desktop */
     struct window       *top_window;       /* desktop window for this desktop */
     struct window       *msg_window;       /* HWND_MESSAGE top window */
     struct hook_table   *global_hooks;     /* table of global hooks on this desktop */
diff --git a/server/winstation.c b/server/winstation.c
index 00afe0119ff..f6fe5fd9e57 100644
--- a/server/winstation.c
+++ b/server/winstation.c
@@ -273,6 +273,7 @@ static struct desktop *create_desktop( const struct unicode_str *name, unsigned
             desktop->close_timeout = NULL;
             desktop->foreground_input = NULL;
             desktop->users = 0;
+            list_init( &desktop->threads );
             memset( &desktop->cursor, 0, sizeof(desktop->cursor) );
             memset( desktop->keystate, 0, sizeof(desktop->keystate) );
             list_add_tail( &winstation->desktops, &desktop->entry );
@@ -362,26 +363,37 @@ static void close_desktop_timeout( void *private )
 }

/* add a user of the desktop and cancel the close timeout */
-static void add_desktop_user( struct desktop *desktop )
+static void add_desktop_thread( struct desktop *desktop, struct thread *thread )
 {
-    desktop->users++;
-    if (desktop->close_timeout)
+    list_add_tail( &desktop->threads, &thread->desktop_entry );
+
+    if (!thread->process->is_system)
     {
-        remove_timeout_user( desktop->close_timeout );
-        desktop->close_timeout = NULL;
+        desktop->users++;
+        if (desktop->close_timeout)
+        {
+            remove_timeout_user( desktop->close_timeout );
+            desktop->close_timeout = NULL;
+        }
     }
 }

/* remove a user of the desktop and start the close timeout if necessary */
-static void remove_desktop_user( struct desktop *desktop )
+static void remove_desktop_thread( struct desktop *desktop, struct thread *thread )
 {
     struct process *process;
-    assert( desktop->users > 0 );
-    desktop->users--;

-    /* if we have one remaining user, it has to be the manager of the desktop window */
-    if ((process = get_top_window_owner( desktop )) && desktop->users == process->running_threads && !desktop->close_timeout)
-        desktop->close_timeout = add_timeout_user( -TICKS_PER_SEC, close_desktop_timeout, desktop );
+    list_remove( &thread->desktop_entry );
+
+    if (!thread->process->is_system)
+    {
+        assert( desktop->users > 0 );
+        desktop->users--;
+
+        /* if we have one remaining user, it has to be the manager of the desktop window */
+        if ((process = get_top_window_owner( desktop )) && desktop->users == process->running_threads && !desktop->close_timeout)
+            desktop->close_timeout = add_timeout_user( -TICKS_PER_SEC, close_desktop_timeout, desktop );
+    }
 }

/* set the thread default desktop handle */
@@ -390,7 +402,7 @@ void set_thread_default_desktop( struct thread *thread, struct desktop *desktop,
     if (thread->desktop) return;  /* nothing to do */

thread->desktop = handle;
-    if (!thread->process->is_system) add_desktop_user( desktop );
+    add_desktop_thread( desktop, thread );
 }

/* set the process default desktop handle */
@@ -500,14 +512,11 @@ void release_thread_desktop( struct thread *thread, int close )

if (!(handle = thread->desktop)) return;

-    if (!thread->process->is_system)
+    if (!(desktop = get_desktop_obj( thread->process, handle, 0 ))) clear_error();  /* ignore errors */
+    else
     {
-        if (!(desktop = get_desktop_obj( thread->process, handle, 0 ))) clear_error();  /* ignore errors */
-        else
-        {
-            remove_desktop_user( desktop );
-            release_object( desktop );
-        }
+        remove_desktop_thread( desktop, thread );
+        release_object( desktop );
     }

if (close)
@@ -730,10 +739,10 @@ DECL_HANDLER(set_thread_desktop)
     else
     {
         current->desktop = req->handle;  /* FIXME: should we close the old one? */
-        if (!current->process->is_system && old_desktop != new_desktop)
+        if (old_desktop != new_desktop)
         {
-            add_desktop_user( new_desktop );
-            if (old_desktop) remove_desktop_user( old_desktop );
+            if (old_desktop) remove_desktop_thread( old_desktop, current );
+            add_desktop_thread( new_desktop, current );
         }
     }