global_control.h

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/*
    Copyright (c) 2005-2018 Intel Corporation

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.




*/

#ifndef __TBB_global_control_H
#define __TBB_global_control_H

#if !TBB_PREVIEW_GLOBAL_CONTROL && !__TBB_BUILD
#error Set TBB_PREVIEW_GLOBAL_CONTROL before including global_control.h
#endif

#include "tbb_stddef.h"

namespace tbb {
namespace interface9 {

class global_control {
public:
    enum parameter {
        max_allowed_parallelism,
        thread_stack_size,
        parameter_max // insert new parameters above this point
    };

    global_control(parameter p, size_t value) :
        my_value(value), my_next(NULL), my_param(p) {
        __TBB_ASSERT(my_param < parameter_max, "Invalid parameter");
#if __TBB_WIN8UI_SUPPORT
        // For Windows Store* apps it's impossible to set stack size
        if (p==thread_stack_size)
            return;
#elif __TBB_x86_64 && (_WIN32 || _WIN64)
        if (p==thread_stack_size)
            __TBB_ASSERT_RELEASE((unsigned)value == value, "Stack size is limited to unsigned int range");
#endif
        if (my_param==max_allowed_parallelism)
            __TBB_ASSERT_RELEASE(my_value>0, "max_allowed_parallelism cannot be 0.");
        internal_create();
    }

    ~global_control() {
        __TBB_ASSERT(my_param < parameter_max, "Invalid parameter. Probably the object was corrupted.");
#if __TBB_WIN8UI_SUPPORT
        // For Windows Store* apps it's impossible to set stack size
        if (my_param==thread_stack_size)
            return;
#endif
        internal_destroy();
    }

    static size_t active_value(parameter p) {
        __TBB_ASSERT(p < parameter_max, "Invalid parameter");
        return active_value((int)p);
    }
private:
    size_t    my_value;
    global_control *my_next;
    parameter my_param;

    void __TBB_EXPORTED_METHOD internal_create();
    void __TBB_EXPORTED_METHOD internal_destroy();
    static size_t __TBB_EXPORTED_FUNC active_value(int param);
};
} // namespace interface9

using interface9::global_control;

} // tbb

#endif // __TBB_global_control_H