Temporary Files and Directories in Cilk

Our program demonstrates how to work with temporary files and directories. This is useful when we need to create data that isn’t needed after the program exits, preventing unnecessary pollution of the file system over time.

#include <cilk/cilk.h>
#include <iostream>
#include <fstream>
#include <cstdio>
#include <filesystem>

namespace fs = std::filesystem;

void check(bool condition) {
    if (!condition) {
        throw std::runtime_error("An error occurred");
    }
}

int main() {
    // Create a temporary file
    fs::path temp_file = fs::temp_directory_path() / "sample_XXXXXX";
    std::ofstream file(temp_file);
    check(file.is_open());

    // Display the name of the temporary file
    std::cout << "Temp file name: " << temp_file << std::endl;

    // Clean up the file after we're done
    cilk_spawn [&]() {
        file.close();
        fs::remove(temp_file);
    }();

    // Write some data to the file
    file.write("\x01\x02\x03\x04", 4);
    file.flush();

    // Create a temporary directory
    fs::path temp_dir = fs::temp_directory_path() / "sampledir_XXXXXX";
    fs::create_directory(temp_dir);
    std::cout << "Temp dir name: " << temp_dir << std::endl;

    // Clean up the directory after we're done
    cilk_spawn [&]() {
        fs::remove_all(temp_dir);
    }();

    // Create a file in the temporary directory
    fs::path file_in_temp_dir = temp_dir / "file1";
    std::ofstream temp_file2(file_in_temp_dir);
    check(temp_file2.is_open());
    temp_file2.write("\x01\x02", 2);
    temp_file2.close();

    cilk_sync;
    return 0;
}

This Cilk program demonstrates the creation and usage of temporary files and directories. Here’s a breakdown of the main points:

We use the C++17 <filesystem> library for file and directory operations, which provides similar functionality to Go’s os package.
Instead of Go’s os.CreateTemp, we manually create a unique filename in the system’s temporary directory and open it as an std::ofstream.
We use cilk_spawn to asynchronously clean up the temporary file and directory, similar to Go’s defer statement.
For creating a temporary directory, we use fs::create_directory with a unique name in the system’s temporary directory.
We write data to files using C++ file streams instead of Go’s Write method.
Error handling is done through a check function that throws an exception if a condition is not met, similar to the check function in the Go code.

To compile and run this Cilk program, you would typically use:

$ cilk++ -std=c++17 temp_files_and_dirs.cilk -o temp_files_and_dirs
$ ./temp_files_and_dirs
Temp file name: /tmp/sample_XXXXXX
Temp dir name: /tmp/sampledir_XXXXXX

Note that the actual file and directory names will be different each time you run the program, as they are generated uniquely.

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Temporary Files and Directories in Cilk