src/gallium/state_trackers/wgl/shared/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       return NULL;
  55
  56    return data;
  57 }
  58
  59 boolean
  60 stw_tls_init_thread(void)
  61 {
  62    struct stw_tls_data *data;
  63
  64    if (tlsIndex == TLS_OUT_OF_INDEXES) {
  65       return FALSE;
  66    }
  67
  68    data = stw_tls_data_create();
  69    if(!data)
  70       return FALSE;
  71
  72    TlsSetValue(tlsIndex, data);
  73
  74    return TRUE;
  75 }
  76
  77 void
  78 stw_tls_cleanup_thread(void)
  79 {
  80    struct stw_tls_data *data;
  81
  82    if (tlsIndex == TLS_OUT_OF_INDEXES) {
  83       return;
  84    }
  85
  86    data = (struct stw_tls_data *) TlsGetValue(tlsIndex);
  87    TlsSetValue(tlsIndex, NULL);
  88    FREE(data);
  89 }
  90
  91 void
  92 stw_tls_cleanup(void)
  93 {
  94    if (tlsIndex != TLS_OUT_OF_INDEXES) {
  95       TlsFree(tlsIndex);
  96       tlsIndex = TLS_OUT_OF_INDEXES;
  97    }
  98 }
  99
 100 struct stw_tls_data *
 101 stw_tls_get_data(void)
 102 {
 103    struct stw_tls_data *data;
 104
 105    if (tlsIndex == TLS_OUT_OF_INDEXES) {
 106       return NULL;
 107    }
 108
 109    data = (struct stw_tls_data *) TlsGetValue(tlsIndex);
 110    if(!data) {
 111       /* DllMain is called with DLL_THREAD_ATTACH only by threads created after
 112        * the DLL is loaded by the process */
 113
 114       data = stw_tls_data_create();
 115       if(!data)
 116          return NULL;
 117
 118       TlsSetValue(tlsIndex, data);
 119    }
 120
 121    return data;
 122 }