libconcurrent

tiny asymmetric-coroutine library.

Description

• asymmetric-coroutine
• bidirectional communication by yield_value/resume_value
• native context switch
• C11

Supported Platforms

Code Example

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdnoreturn.h>

#include <concurrent/concurrent.h>
#include <concurrent/shortname.h>

#define STACK_SIZE (1024 * 2)


noreturn void accumulator(struct concurrent_ctx *ctx)
{
    int *v = ctx_get_resume_value(ctx);
    int total = *v;
    for (;;) {
        v = yield_value(ctx, &total); // send total / receive next value
        total += *v;
    }
}

int main(void)
{
    struct concurrent_ctx *ctx;
    uint8_t stack[STACK_SIZE];
    uint8_t ctx_alloc[ctx_sizeof()];
    concurrent_init();
    ctx = (struct concurrent_ctx *)ctx_alloc;
    ctx_construct(ctx, stack, STACK_SIZE, accumulator, NULL);
    for (int i = 1; i <= 10; i++) {
        int *total = resume_value(ctx, &i); // send value / receive total
        printf("total = %d\n", *total);
        
    }
    ctx_destruct(ctx);
    concurrent_fin();
    return EXIT_SUCCESS;
}

/*
$ gcc -o sample sample.c -lconcurrent.a
$ ./sample
total = 1
total = 3
total = 6
total = 10
total = 15
total = 21
total = 28
total = 36
total = 45
total = 55
*/

Requirements for build

• for x86_64/i686: nasm

Installation

$ git clone https://github.com/sharow/libconcurrent.git libconcurrent
$ cd libconcurrent
$ make
$ sudo make install

for FreeBSD

Available in ports collection as devel/libconcurrent

for OSX

• install latest nasm from brew

$ brew install nasm

Tests

$ make test

Benchmark

examples/many_context1.c:

-- output: (Xeon E3 2.5Ghz)
3000000 context switch in 373.5 ms
one context switch in 125 ns
8031333 resume/yield pair per second


-- output: (RaspberryPi2 ARMv7 900MHz)
3000000 context switch in 2861.8 ms
one context switch in 954 ns
1048287 resume/yield pair per second

VS.

• Portable Coroutine Library (PCL): http://xmailserver.org/libpcl.html
• libtask: https://code.google.com/p/libtask/
• libconcurrency: http://code.google.com/p/libconcurrency/
• libcoro: http://software.schmorp.de/pkg/libcoro.html
• libcoroutine: https://github.com/stevedekorte/coroutine
• coro: http://www.goron.de/~froese/coro/
• libfiber: http://www.rkeene.org/projects/info/wiki/22
• mill: https://github.com/sustrik/mill
• fcontext: https://github.com/reginaldl/fcontext
• libwire: https://github.com/baruch/libwire
• coroutine(A asymmetric coroutine library for C): https://github.com/cloudwu/coroutine
• coroutine(a asymmetric coroutine (lua like) with fixed-size stack): https://github.com/xphh/coroutine
• coroutine(coroutine library with pthread-like interface in pure C): https://github.com/Marcus366/coroutine
• coroutines(A lightweight coroutine library written in C and assembler): https://github.com/xya/coroutines
• micro: https://github.com/mikewei/micoro