# HevTaskSystem

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HevTaskSystem is a simple, lightweight multi-task system (coroutines) for Unix.

The task system is executed within a Unix process/thread. In task system, you
can create many tasks and attach them to the task system. When a task yields or
is blocked by I/O, the scheduler will pick a suitable task from running list and
switch to it. Memory space, file descriptors, and other resources are shared among
all tasks in the task system. Each task has its private, standalone task structure
(#HevTask) and stack in heap of the process.

Within a task, you can allocate memory from heap, read and write data to the stack,
and perform I/O operations in synchronized mode.

## Features

* Simple/lightweight task.
* I/O operations wrapper.
* Inter-task synchronous. (Mutex/Condition)
* Inter-task communications. (Channel)
* Slice-based memory allocator.
* Call on new stack.
* Multi-thread support.
* Multi-platform support. (Linux/BSD/macOS)

## How to Build

### Unix

```bash
git clone https://gitlab.com/hev/hev-task-system
cd hev-task-system
make

# Link with librt (only for glibc versions before 2.17)
make LDFLAGS=-lrt

# Disable stack overflow detection
make ENABLE_STACK_OVERFLOW_DETECTION=0

# Set stack backend to heap (Recommended for 32-bit)
make CONFIG_STACK_BACKEND=STACK_HEAP

# Disable sliced memory allocator
make ENABLE_MEMALLOC_SLICE=0

# Disable I/O splice by splice syscall (for old Linux kernel)
make ENABLE_IO_SPLICE_SYSCALL=0

# Demos
make apps

# Tests
make tests
```

### Android

```bash
mkdir hev-task-system
cd hev-task-system
git clone https://gitlab.com/hev/hev-task-system jni
ndk-build
```

### iOS and MacOS

```bash
git clone https://gitlab.com/hev/hev-task-system
cd hev-task-system
# will generate HevTaskSystem.xcframework
./build-apple.sh
```

## Demos

1. [simple](https://gitlab.com/hev/hev-task-system/blob/master/apps/simple.c)
1. [channel](https://gitlab.com/hev/hev-task-system/blob/master/apps/channel.c)
1. [timeout](https://gitlab.com/hev/hev-task-system/blob/master/apps/timeout.c)
1. [wakeup](https://gitlab.com/hev/hev-task-system/blob/master/apps/wakeup.c)
1. [echo-server](https://gitlab.com/hev/hev-task-system/blob/master/apps/echo-server.c)
1. [call](https://gitlab.com/hev/hev-task-system/blob/master/apps/call.c)
1. [gtk](https://gitlab.com/hev/hev-task-system/blob/master/apps/gtk.c)
1. [curl](https://gitlab.com/hev/hev-task-system/blob/master/apps/curl.c)

## Contributors

* **hev** - https://hev.cc

## License

MIT