xe

Hyper Fast io_uring Async I/O Library

Documentation is still WIP

Features

xe

• High Performance
• Low Latency I/O
• Fast Nanosecond Precision Timers
• Ultra Lightweight (0.6% overhead for echoserver)

xe/io

• Socket and File classes and utilities
• Epoll/libuv-like fast poll handle

xurl (WIP)

• Async DNS resolution
• HTTP, WS, and FILE url protocols (WIP)

Benchmarks

Library	Speed	%
xe	363K	100.0 %
l4cpp	362K	99.8 %
frevib	353K	97.3 %
epoll	351K	96.8 %
photon	305K	84.1 %

See benchmarks

Examples

// hello world snippet
static task run(xe_loop& loop){
	char msg[] = "Hello World!\n";

	co_await loop.queue(xe_op::write(STDOUT_FILENO, msg, sizeof(msg) - 1, 0));
}

Above snippet from hello_world.cc

// echo server snippet
static task echo(xe_socket& socket){
	byte buf[16384];
	int result;

	while(true){
		result = co_await socket.recv(buf, 16384, 0);

		if(result <= 0)
			break;
		result = co_await socket.send(buf, result, 0);

		if(result < 0)
			break;
	}
}

Above snippet from echoserver.cc

See examples and coroutine examples

Running Examples

See Building xe below

cd build
./coroutine_hello_world
./timer
./coroutine_file
./http # only if xurl enabled with openssl or wolfssl
./coroutine_echoserver
./echoserver

Using

Prerequisites

• Linux Kernel 5.11 or later
• liburing apt install liburing-dev or install from source
• cmake apt install cmake
• g++ 10 or newer, or clang 12 or newer apt install g++-10/clang++-12

xurl prerequisites (only if enabled, disabled by default)

• c-ares apt install libc-ares-dev or install from source

One of:

• OpenSSL >= 1.1.1 apt install libssl-dev
• wolfSSL (must be installed from source, see build flags)

Use with cmake

project(sample CXX)

# remove two lines below to disable xurl
set(XE_ENABLE_XURL ON)
set(XE_USE_OPENSSL ON) # alternatively set(XE_USE_WOLFSSL ON)

FetchContent_Declare(xe GIT_REPOSITORY https://github.com/davidzeng0/xe.git GIT_TAG master)
FetchContent_MakeAvailable(xe)

...

target_link_libraries(sample xe)

# with xurl
target_link_libraries(sample xe xurl)

Build xe

mkdir build; cd build

# with ninja
cmake -G "Ninja" -DCMAKE_BUILD_TYPE="Release" -DCMAKE_CXX_COMPILER="/your/cxx/compiler" ..
# enable xurl and use openssl
cmake -G "Ninja" -DXE_ENABLE_XURL="ON" -DXE_USE_OPENSSL="ON" -DCMAKE_BUILD_TYPE="Release" -DCMAKE_CXX_COMPILER="/your/cxx/compiler" ..

# without ninja
cmake -DCMAKE_BUILD_TYPE="Release" -DCMAKE_CXX_COMPILER="/your/cxx/compiler" ..

cmake --build .