JavaSharedMemory

Shared memory between processes. (Java, C++, Rust, etc.) Based on Java 19 Foreign Function & Memory API

Support Windows (CreateFileMapping), Linux and macOS (mmap and shmget).

Note Compared with standard input and output (anonymous pipes) on Windows, more than 2x performance improvement.

Usage

Java

repositories {
    maven { url 'https://www.jitpack.io' }
}

dependencies {
    implementation 'com.github.ShirasawaSama:JavaSharedMemory:<version>'
}

tasks.withType(JavaCompile).each {
    it.options.compilerArgs.add('--enable-preview')
}

// kotlin script
// tasks.withType<JavaCompile> {
//     options.compilerArgs = options.compilerArgs + listOf("--enable-preview")
// }

import cn.apisium.shm;

public class Main {
    public static void main(String[] args) {
        // var shm = SharedMemory.open("test", 1024)
        try (var shm = SharedMemory.create("test", 1024)) {
            var buf = shm.toByteBuffer();
            buf.put("Hello, World!".getBytes());
        }
    }
}

C++

git submodule add https://github.com/ShirasawaSama/JavaSharedMemory.git

CMakeLists.txt:

add_subdirectory(JavaSharedMemory)
target_link_libraries(${PROJECT_NAME} java_shared_memory)

main.cpp:

#include <jshm.h>

int main() {
    auto shm = jshm::shared_memory::create("test", 1024);
    // auto shm = jshm::shared_memory::open("test", 1024);
    strcpy((char*)shm->address(), "Hello, World!");
    delete shm;
}

Author

Shirasawa

License

MIT