winsup/cygwin/window.cc

   1 /* window.cc: hidden windows for signals/itimer support
   2
   3    Written by Sergey Okhapkin <sos@prospect.com.ru>
   4
   5 This file is part of Cygwin.
   6
   7 This software is a copyrighted work licensed under the terms of the
   8 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
   9 details. */
  10
  11 #include "winsup.h"
  12 #include <sys/time.h>
  13 #define USE_SYS_TYPES_FD_SET
  14 #include <winsock2.h>
  15 #include "perprocess.h"
  16 #include "cygtls.h"
  17 #include "sync.h"
  18 #include "wininfo.h"
  19
  20 wininfo NO_COPY winmsg;
  21
  22 muto NO_COPY wininfo::_lock;
  23
  24 int
  25 wininfo::process (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
  26 {
  27 #ifndef NOSTRACE
  28   strace.wm (uMsg, wParam, lParam);
  29 #endif
  30   switch (uMsg)
  31     {
  32     case WM_PAINT:
  33       return 0;
  34     case WM_DESTROY:
  35       PostQuitMessage (0);
  36       return 0;
  37     case WM_ASYNCIO:
  38       if (WSAGETSELECTEVENT (lParam) == FD_OOB)
  39         raise (SIGURG);
  40       else
  41         raise (SIGIO);
  42       return 0;
  43     default:
  44       return DefWindowProcW (hwnd, uMsg, wParam, lParam);
  45     }
  46 }
  47
  48 static LRESULT CALLBACK
  49 process_window_events (HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
  50 {
  51   return winmsg.process (hwnd, uMsg, wParam, lParam);
  52 }
  53
  54 /* Handle windows events.  Inherits ownership of the wininfo lock */
  55 DWORD
  56 wininfo::winthread ()
  57 {
  58   MSG msg;
  59   WNDCLASSW wc;
  60   static NO_COPY WCHAR classname[] = L"CygwinWndClass";
  61
  62   _lock.grab ();
  63   /* Register the window class for the main window. */
  64
  65   wc.style = 0;
  66   wc.lpfnWndProc = (WNDPROC) process_window_events;
  67   wc.cbClsExtra = 0;
  68   wc.cbWndExtra = 0;
  69   wc.hInstance = user_data->hmodule;
  70   wc.hIcon = NULL;
  71   wc.hCursor = NULL;
  72   wc.hbrBackground = NULL;
  73   wc.lpszMenuName = NULL;
  74   wc.lpszClassName = classname;
  75
  76   if (!RegisterClassW (&wc))
  77     api_fatal ("cannot register window class, %E");
  78
  79   /* Create hidden window. */
  80   hwnd = CreateWindowExW (0, classname, classname, WS_POPUP, CW_USEDEFAULT,
  81                           CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
  82                           (HWND) NULL, (HMENU) NULL, user_data->hmodule,
  83                           (LPVOID) NULL);
  84   if (!hwnd)
  85     api_fatal ("couldn't create window, %E");
  86   release ();
  87
  88   int ret;
  89   while ((ret = (int) GetMessageW (&msg, hwnd, 0, 0)) > 0)
  90     DispatchMessageW (&msg);
  91
  92   return 0;
  93 }
  94
  95 static DWORD
  96 winthread (VOID *arg)
  97 {
  98   return  ((wininfo *) arg)->winthread ();
  99 }
 100
 101 wininfo::operator
 102 HWND ()
 103 {
 104   if (hwnd)
 105     return hwnd;
 106
 107   lock ();
 108   if (!hwnd)
 109     {
 110       _lock.upforgrabs ();
 111       cygthread *h = new cygthread (::winthread, this, "win");
 112       h->SetThreadPriority (THREAD_PRIORITY_HIGHEST);
 113       h->zap_h ();
 114       lock ();
 115     }
 116   release ();
 117   return hwnd;
 118 }
 119
 120 void
 121 wininfo::lock ()
 122 {
 123   _lock.init ("wininfo_lock")->acquire ();
 124 }
 125
 126 void
 127 wininfo::release ()
 128 {
 129   _lock.release ();
 130 }