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      1 //
      2 // Copyright (C) 2002-2005  3Dlabs Inc. Ltd.
      3 // All rights reserved.
      4 //
      5 // Redistribution and use in source and binary forms, with or without
      6 // modification, are permitted provided that the following conditions
      7 // are met:
      8 //
      9 //    Redistributions of source code must retain the above copyright
     10 //    notice, this list of conditions and the following disclaimer.
     11 //
     12 //    Redistributions in binary form must reproduce the above
     13 //    copyright notice, this list of conditions and the following
     14 //    disclaimer in the documentation and/or other materials provided
     15 //    with the distribution.
     16 //
     17 //    Neither the name of 3Dlabs Inc. Ltd. nor the names of its
     18 //    contributors may be used to endorse or promote products derived
     19 //    from this software without specific prior written permission.
     20 //
     21 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     22 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     23 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     24 // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     25 // COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     26 // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     27 // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     28 // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     29 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
     31 // ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     32 // POSSIBILITY OF SUCH DAMAGE.
     33 //
     34 
     35 #define SH_EXPORTING
     36 
     37 #include <cassert>
     38 
     39 #include "InitializeDll.h"
     40 #include "../glslang/Include/InitializeGlobals.h"
     41 
     42 #include "../glslang/Public/ShaderLang.h"
     43 
     44 namespace glslang {
     45 
     46 OS_TLSIndex ThreadInitializeIndex = OS_INVALID_TLS_INDEX;
     47 
     48 bool InitProcess()
     49 {
     50     glslang::GetGlobalLock();
     51 
     52     if (ThreadInitializeIndex != OS_INVALID_TLS_INDEX) {
     53         //
     54         // Function is re-entrant.
     55         //
     56 
     57         glslang::ReleaseGlobalLock();
     58         return true;
     59     }
     60 
     61     ThreadInitializeIndex = OS_AllocTLSIndex();
     62 
     63     if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX) {
     64         assert(0 && "InitProcess(): Failed to allocate TLS area for init flag");
     65 
     66         glslang::ReleaseGlobalLock();
     67         return false;
     68     }
     69 
     70     if (! InitializePoolIndex()) {
     71         assert(0 && "InitProcess(): Failed to initialize global pool");
     72 
     73         glslang::ReleaseGlobalLock();
     74         return false;
     75     }
     76 
     77     if (! InitThread()) {
     78         assert(0 && "InitProcess(): Failed to initialize thread");
     79 
     80         glslang::ReleaseGlobalLock();
     81         return false;
     82     }
     83 
     84     glslang::ReleaseGlobalLock();
     85     return true;
     86 }
     87 
     88 
     89 bool InitThread()
     90 {
     91     //
     92     // This function is re-entrant
     93     //
     94     if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX) {
     95         assert(0 && "InitThread(): Process hasn't been initalised.");
     96         return false;
     97     }
     98 
     99     if (OS_GetTLSValue(ThreadInitializeIndex) != 0)
    100         return true;
    101 
    102     InitializeMemoryPools();
    103 
    104     if (! OS_SetTLSValue(ThreadInitializeIndex, (void *)1)) {
    105         assert(0 && "InitThread(): Unable to set init flag.");
    106         return false;
    107     }
    108 
    109     return true;
    110 }
    111 
    112 
    113 bool DetachThread()
    114 {
    115     bool success = true;
    116 
    117     if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX)
    118         return true;
    119 
    120     //
    121     // Function is re-entrant and this thread may not have been initialized.
    122     //
    123     if (OS_GetTLSValue(ThreadInitializeIndex) != 0) {
    124         if (!OS_SetTLSValue(ThreadInitializeIndex, (void *)0)) {
    125             assert(0 && "DetachThread(): Unable to clear init flag.");
    126             success = false;
    127         }
    128 
    129         FreeGlobalPools();
    130 
    131     }
    132 
    133     return success;
    134 }
    135 
    136 bool DetachProcess()
    137 {
    138     bool success = true;
    139 
    140     if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX)
    141         return true;
    142 
    143     ShFinalize();
    144 
    145     success = DetachThread();
    146 
    147     FreePoolIndex();
    148 
    149     OS_FreeTLSIndex(ThreadInitializeIndex);
    150     ThreadInitializeIndex = OS_INVALID_TLS_INDEX;
    151 
    152     return success;
    153 }
    154 
    155 } // end namespace glslang
    156