#882

Committed 31 Aug 2023 07:44PM UTC coverage: 41.798% (-44.7%) from 86.546%

Build # #882

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/examples/async_io/async_io_simple.cpp

//  Copyright (c) 2007-2024 Hartmut Kaiser
//
//  SPDX-License-Identifier: BSL-1.0
//  Distributed under the Boost Software License, Version 1.0. (See accompanying
//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

// The purpose of this example is to demonstrate how it is possible to
// schedule an IO task onto one of the IO-threads in HPX (which are OS-threads)
// and how to synchronize the result of this IO task with a waiting HPX thread.

#include <hpx/assert.hpp>
#include <hpx/hpx_init.hpp>
#include <hpx/include/parallel_executors.hpp>
#include <hpx/include/runtime.hpp>
#include <hpx/iostream.hpp>

#include <functional>
#include <iostream>

// this function will be executed by a dedicated OS thread
void do_async_io(char const* string_to_write, int& result)
{
    // This IO operation will possibly block the IO thread in the
    // kernel.
    std::cout << "OS-thread: " << string_to_write << std::endl;

    result = 1;
}

// This function will be executed by an HPX thread
int async_io(char const* string_to_write)
{
    int result = 0;

    {
        // Get a reference to one of the IO specific HPX io_service objects ...
        hpx::execution::experimental::io_pool_executor executor;

        // ... and schedule the handler to run on one of its OS-threads.
        hpx::async(executor, &do_async_io, string_to_write, std::ref(result))
            .get();
    }

    HPX_ASSERT(result == 1);

    return result;    // this will be executed only after result has been set
}

int hpx_main()
{
    {
        // Execute an asynchronous IO operation wait for it to complete without
        // blocking any of the HPX thread-manager threads.
        int result = async_io("Write this string to std::cout");

        // Print the returned result.
        hpx::cout << "HPX-thread: The asynchronous IO operation returned: "
                  << result << "\n"
                  << std::flush;
    }

    return hpx::finalize();    // Initiate shutdown of the runtime system.
}

int main(int argc, char* argv[])
{
    return hpx::init(argc, argv);    // Initialize and run HPX.
}

1	// Copyright (c) 2007-2024 Hartmut Kaiser
2	//
3	// SPDX-License-Identifier: BSL-1.0
4	// Distributed under the Boost Software License, Version 1.0. (See accompanying
5	// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6
7	// The purpose of this example is to demonstrate how it is possible to
8	// schedule an IO task onto one of the IO-threads in HPX (which are OS-threads)
9	// and how to synchronize the result of this IO task with a waiting HPX thread.
10
11	#include <hpx/assert.hpp>
12	#include <hpx/hpx_init.hpp>
13	#include <hpx/include/parallel_executors.hpp>
14	#include <hpx/include/runtime.hpp>
15	#include <hpx/iostream.hpp>
16
17	#include <functional>
18	#include <iostream>
19
20	// this function will be executed by a dedicated OS thread
21	void do_async_io(char const* string_to_write, int& result)	×
22	{
23	// This IO operation will possibly block the IO thread in the
24	// kernel.
25	std::cout << "OS-thread: " << string_to_write << std::endl;	×
26
27	result = 1;	×
28	}	×
29
30	// This function will be executed by an HPX thread
31	int async_io(char const* string_to_write)	×
32	{
33	int result = 0;	×
34
35	{
36	// Get a reference to one of the IO specific HPX io_service objects ...
37	hpx::execution::experimental::io_pool_executor executor;
38
39	// ... and schedule the handler to run on one of its OS-threads.
40	hpx::async(executor, &do_async_io, string_to_write, std::ref(result))	×
41	.get();	×
42	}
43
44	HPX_ASSERT(result == 1);
45
46	return result; // this will be executed only after result has been set	×
47	}
48
49	int hpx_main()	×
50	{
51	{
52	// Execute an asynchronous IO operation wait for it to complete without
53	// blocking any of the HPX thread-manager threads.
54	int result = async_io("Write this string to std::cout");	×
55
56	// Print the returned result.
57	hpx::cout << "HPX-thread: The asynchronous IO operation returned: "	×
58	<< result << "\n"	×
59	<< std::flush;	×
60	}
61
62	return hpx::finalize(); // Initiate shutdown of the runtime system.	×
63	}
64
65	int main(int argc, char* argv[])	×
66	{
67	return hpx::init(argc, argv); // Initialize and run HPX.	×
68	}

STEllAR-GROUP / hpx / #882

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