├── CMakeLists.txt
├── README.md
└── libuv-test.c


/CMakeLists.txt:
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 1 | #Standard stuff
 2 | cmake_minimum_required(VERSION 2.6)
 3 | project(libuv_test)
 4 | 
 5 | #Check threads
 6 | set(CMAKE_THREAD_PREFER_PTHREAD 1)
 7 | include(FindThreads)
 8 | 
 9 | if(NOT CMAKE_USE_PTHREADS_INIT)
10 |     message(FATAL_ERROR "Could not find pthreads")
11 | endif(NOT CMAKE_USE_PTHREADS_INIT)
12 | 
13 | #Static way of locating library
14 | find_library(LIBRT_LIBRARY rt)
15 | 
16 | if(NOT LIBRT_LIBRARY)
17 |     message(FATAL_ERROR "Librt could not be found")
18 | endif(NOT LIBRT_LIBRARY)
19 | 
20 | #Add the libuv-dir. Compile this using another CMake-file?
21 | find_library(LIBUV uv lib/libuv)
22 | 
23 | include_directories(lib/libuv/include)
24 | add_executable(libuv_test libuv-test.c)
25 | target_link_libraries(libuv_test ${CMAKE_THREAD_LIBS_INIT})
26 | target_link_libraries(libuv_test ${LIBUV})
27 | target_link_libraries(libuv_test ${LIBRT_LIBRARY})
28 | 


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/README.md:
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1 | libuv-multiple-loops
2 | ====================
3 | 
4 | An example showing how to use multiple event loops in libuv. The loops run in
5 | two different threads, and the example also shows how threads can communicate.
6 | 
7 | Also included is a CMakeLists.txt file, in case you want to use CMake. Remember
8 | to adjust paths to libuv.
9 | 


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/libuv-test.c:
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 1 | #include <stdio.h>
 2 | #include <stdint.h>
 3 | #include <pthread.h>
 4 | #include <uv.h>
 5 | 
 6 | /* Libuv multiple loops + thread communication example. Written by Kristian
 7 |  * Evensen <kristian.evensen@gmail.com>  */
 8 | 
 9 | //rpath is needed because it is an argument to the linker (not compiler) about
10 | //where to look
11 | //gcc -Iinclude -g libuv-test.c -o libuv_test -L "./" -l uv -Xlinker -rpath -Xlinker "./" -lrt
12 | 
13 | void timer_callback(uv_timer_t *handle, int status){
14 |     uv_async_t *other_thread_notifier = (uv_async_t *) handle->data;
15 | 
16 |     fprintf(stderr, "Timer expired, notifying other thread\n");
17 | 
18 |     //Notify the other thread
19 |     uv_async_send(other_thread_notifier);
20 | }
21 | 
22 | void *child_thread(void *data){
23 |     uv_loop_t *thread_loop = (uv_loop_t *) data;
24 |     fprintf(stderr, "Consumer thread will start event loop\n");
25 | 
26 |     //Start this loop
27 |     uv_run(thread_loop);
28 |     pthread_exit(NULL);
29 | }
30 | 
31 | void consumer_notify(uv_async_t *handle, int status){
32 |     fprintf(stderr, "Hello from the other thread\n", handle->loop->backend_fd);
33 | }
34 | 
35 | int main(int argc, char *argv[]){
36 |     pthread_t thread;
37 |     uv_async_t async;
38 | 
39 |     /* Create and set up the consumer thread */
40 |     uv_loop_t *thread_loop = uv_loop_new();
41 |     uv_async_init(thread_loop, &async, consumer_notify);
42 |     pthread_create(&thread, NULL, child_thread, thread_loop);
43 | 
44 |     /* Main thread will run default loop */
45 |     uv_loop_t *main_loop = uv_default_loop();
46 |     uv_timer_t timer_req;
47 |     uv_timer_init(main_loop, &timer_req);
48 | 
49 |     /* Timer callback needs async so it knows where to send messages */
50 |     timer_req.data = &async;
51 |     uv_timer_start(&timer_req, timer_callback, 0, 2000);
52 | 
53 |     fprintf(stderr, "Starting main loop\n");
54 |     uv_run(main_loop);
55 | 
56 |     return 0;
57 | }
58 | 


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