src/gallium/state_trackers/wgl/stw_tls.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include <windows.h>
  29
  30 #include "pipe/p_compiler.h"
  31 #include "util/u_memory.h"
  32 #include "stw_tls.h"
  33
  34 static DWORD tlsIndex = TLS_OUT_OF_INDEXES;
  35
  36 boolean
  37 stw_tls_init(void)
  38 {
  39    tlsIndex = TlsAlloc();
  40    if (tlsIndex == TLS_OUT_OF_INDEXES) {
  41       return FALSE;
  42    }
  43
  44    return TRUE;
  45 }
  46
  47 static INLINE struct stw_tls_data *
  48 stw_tls_data_create()
  49 {
  50    struct stw_tls_data *data;
  51
  52    data = CALLOC_STRUCT(stw_tls_data);
  53    if (!data)
  54       goto no_data;
  55
  56    data->hCallWndProcHook = SetWindowsHookEx(WH_CALLWNDPROC,
  57                                              stw_call_window_proc,
  58                                              NULL,
  59                                              GetCurrentThreadId());
  60    if(data->hCallWndProcHook == NULL)
  61       goto no_hook;
  62
  63    TlsSetValue(tlsIndex, data);
  64
  65    return data;
  66
  67 no_hook:
  68    FREE(data);
  69 no_data:
  70    return NULL;
  71 }
  72
  73 boolean
  74 stw_tls_init_thread(void)
  75 {
  76    struct stw_tls_data *data;
  77
  78    if (tlsIndex == TLS_OUT_OF_INDEXES) {
  79       return FALSE;
  80    }
  81
  82    data = stw_tls_data_create();
  83    if(!data)
  84       return FALSE;
  85
  86    return TRUE;
  87 }
  88
  89 void
  90 stw_tls_cleanup_thread(void)
  91 {
  92    struct stw_tls_data *data;
  93
  94    if (tlsIndex == TLS_OUT_OF_INDEXES) {
  95       return;
  96    }
  97
  98    data = (struct stw_tls_data *) TlsGetValue(tlsIndex);
  99    if(data) {
 100       TlsSetValue(tlsIndex, NULL);
 101
 102       if(data->hCallWndProcHook) {
 103          UnhookWindowsHookEx(data->hCallWndProcHook);
 104          data->hCallWndProcHook = NULL;
 105       }
 106
 107       FREE(data);
 108    }
 109 }
 110
 111 void
 112 stw_tls_cleanup(void)
 113 {
 114    if (tlsIndex != TLS_OUT_OF_INDEXES) {
 115       TlsFree(tlsIndex);
 116       tlsIndex = TLS_OUT_OF_INDEXES;
 117    }
 118 }
 119
 120 struct stw_tls_data *
 121 stw_tls_get_data(void)
 122 {
 123    struct stw_tls_data *data;
 124
 125    if (tlsIndex == TLS_OUT_OF_INDEXES) {
 126       return NULL;
 127    }
 128
 129    data = (struct stw_tls_data *) TlsGetValue(tlsIndex);
 130    if(!data) {
 131       /* DllMain is called with DLL_THREAD_ATTACH only by threads created after
 132        * the DLL is loaded by the process */
 133       data = stw_tls_data_create();
 134       if(!data)
 135          return NULL;
 136    }
 137
 138    return data;
 139 }