server: Add a process flag indicating whether the process is terminating, use it to block thread creation in a being terminated process.

dlls/kernel32/tests/loader.c

@@ -1525,7 +1525,6 @@ static void child_process(const char *dll_name, DWORD target_offset)
 
         SetLastError(0xdeadbeef);
         thread = CreateThread(NULL, 0, noop_thread_proc, &dummy, 0, &ret);
-todo_wine
         ok(!thread || broken(thread != 0) /* before win7 */, "CreateThread should fail\n");
         if (!thread)
             ok(GetLastError() == ERROR_ACCESS_DENIED, "expected ERROR_ACCESS_DENIED, got %d\n", GetLastError());

server/process.c

@@ -323,6 +323,7 @@ struct thread *create_process( int fd, struct thread *parent_thread, int inherit
     process->suspend         = 0;
     process->is_system       = 0;
     process->debug_children  = 0;
+    process->is_terminating  = 0;
     process->console         = NULL;
     process->startup_state   = STARTUP_IN_PROGRESS;
     process->startup_info    = NULL;
@@ -570,6 +571,8 @@ static void terminate_process( struct process *process, struct thread *skip, int
     struct thread *thread;
 
     grab_object( process );  /* make sure it doesn't get freed when threads die */
+    process->is_terminating = 1;
+
 restart:
     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
     {

server/process.h

@@ -74,6 +74,7 @@ struct process
     int                  suspend;         /* global process suspend count */
     unsigned int         is_system:1;     /* is it a system process? */
     unsigned int         debug_children:1;/* also debug all child processes */
+    unsigned int         is_terminating:1;/* is process terminating? */
     struct list          locks;           /* list of file locks owned by the process */
     struct list          classes;         /* window classes owned by the process */
     struct console_input*console;         /* console input */

server/thread.c

@@ -214,6 +214,12 @@ struct thread *create_thread( int fd, struct process *process )
 {
     struct thread *thread;
 
+    if (process->is_terminating)
+    {
+        set_error( STATUS_PROCESS_IS_TERMINATING );
+        return NULL;
+    }
+
     if (!(thread = alloc_object( &thread_ops ))) return NULL;
 
     init_thread_structure( thread );