OGLCompilersDLL/InitializeDll.cpp

//
// Copyright (C) 2002-2005  3Dlabs Inc. Ltd.
// All rights reserved.
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// modification, are permitted provided that the following conditions
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//
//    Redistributions in binary form must reproduce the above
//    copyright notice, this list of conditions and the following
//    disclaimer in the documentation and/or other materials provided
//    with the distribution.
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//    contributors may be used to endorse or promote products derived
//    from this software without specific prior written permission.
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#define SH_EXPORTING

#include <cassert>

#include "InitializeDll.h"
#include "../glslang/Include/InitializeGlobals.h"

#include "../glslang/Public/ShaderLang.h"

namespace glslang {

OS_TLSIndex ThreadInitializeIndex = OS_INVALID_TLS_INDEX;

bool InitProcess()
{
    glslang::GetGlobalLock();

    if (ThreadInitializeIndex != OS_INVALID_TLS_INDEX) {
        //
        // Function is re-entrant.
        //

        glslang::ReleaseGlobalLock();
        return true;
    }

    ThreadInitializeIndex = OS_AllocTLSIndex();

    if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX) {
        assert(0 && "InitProcess(): Failed to allocate TLS area for init flag");

        glslang::ReleaseGlobalLock();
        return false;
    }

    if (! InitializePoolIndex()) {
        assert(0 && "InitProcess(): Failed to initialize global pool");

        glslang::ReleaseGlobalLock();
        return false;
    }

    if (! InitThread()) {
        assert(0 && "InitProcess(): Failed to initialize thread");

        glslang::ReleaseGlobalLock();
        return false;
    }

    glslang::ReleaseGlobalLock();
    return true;
}


bool InitThread()
{
    //
    // This function is re-entrant
    //
    if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX) {
        assert(0 && "InitThread(): Process hasn't been initalised.");
        return false;
    }

    if (OS_GetTLSValue(ThreadInitializeIndex) != 0)
        return true;

    InitializeMemoryPools();

    if (! OS_SetTLSValue(ThreadInitializeIndex, (void *)1)) {
        assert(0 && "InitThread(): Unable to set init flag.");
        return false;
    }

    return true;
}


bool DetachThread()
{
    bool success = true;

    if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX)
        return true;

    //
    // Function is re-entrant and this thread may not have been initialized.
    //
    if (OS_GetTLSValue(ThreadInitializeIndex) != 0) {
        if (!OS_SetTLSValue(ThreadInitializeIndex, (void *)0)) {
            assert(0 && "DetachThread(): Unable to clear init flag.");
            success = false;
        }

        FreeGlobalPools();

    }

    return success;
}

bool DetachProcess()
{
    bool success = true;

    if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX)
        return true;

    ShFinalize();

    success = DetachThread();

    FreePoolIndex();

    OS_FreeTLSIndex(ThreadInitializeIndex);
    ThreadInitializeIndex = OS_INVALID_TLS_INDEX;

    return success;
}

} // end namespace glslang