1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved. 2 * 3 * Permission is hereby granted, free of charge, to any person obtaining a copy 4 * of this software and associated documentation files (the "Software"), to 5 * deal in the Software without restriction, including without limitation the 6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 7 * sell copies of the Software, and to permit persons to whom the Software is 8 * furnished to do so, subject to the following conditions: 9 * 10 * The above copyright notice and this permission notice shall be included in 11 * all copies or substantial portions of the Software. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 19 * IN THE SOFTWARE. 20 */ 21 22 #include "uv.h" 23 #include "task.h" 24 #include <stdio.h> 25 #include <stdlib.h> 26 27 static uv_thread_t thread; 28 static uv_mutex_t mutex; 29 30 static uv_prepare_t prepare; 31 static uv_async_t async; 32 33 static volatile int async_cb_called; 34 static int prepare_cb_called; 35 static int close_cb_called; 36 37 38 static void thread_cb(void *arg) { 39 int n; 40 int r; 41 42 for (;;) { 43 uv_mutex_lock(&mutex); 44 n = async_cb_called; 45 uv_mutex_unlock(&mutex); 46 47 if (n == 3) { 48 break; 49 } 50 51 r = uv_async_send(&async); 52 ASSERT(r == 0); 53 54 /* Work around a bug in Valgrind. 55 * 56 * Valgrind runs threads not in parallel but sequentially, i.e. one after 57 * the other. It also doesn't preempt them, instead it depends on threads 58 * yielding voluntarily by making a syscall. 59 * 60 * That never happens here: the pipe that is associated with the async 61 * handle is written to once but that's too early for Valgrind's scheduler 62 * to kick in. Afterwards, the thread busy-loops, starving the main thread. 63 * Therefore, we yield. 64 * 65 * This behavior has been observed with Valgrind 3.7.0 and 3.9.0. 66 */ 67 uv_sleep(0); 68 } 69 } 70 71 72 static void close_cb(uv_handle_t* handle) { 73 ASSERT_NOT_NULL(handle); 74 close_cb_called++; 75 } 76 77 78 static void async_cb(uv_async_t* handle) { 79 int n; 80 81 ASSERT(handle == &async); 82 83 uv_mutex_lock(&mutex); 84 n = ++async_cb_called; 85 uv_mutex_unlock(&mutex); 86 87 if (n == 3) { 88 uv_close((uv_handle_t*)&async, close_cb); 89 uv_close((uv_handle_t*)&prepare, close_cb); 90 } 91 } 92 93 94 static void prepare_cb(uv_prepare_t* handle) { 95 int r; 96 97 ASSERT(handle == &prepare); 98 99 if (prepare_cb_called++) 100 return; 101 102 r = uv_thread_create(&thread, thread_cb, NULL); 103 ASSERT(r == 0); 104 uv_mutex_unlock(&mutex); 105 } 106 107 108 TEST_IMPL(async) { 109 int r; 110 111 r = uv_mutex_init(&mutex); 112 ASSERT(r == 0); 113 uv_mutex_lock(&mutex); 114 115 r = uv_prepare_init(uv_default_loop(), &prepare); 116 ASSERT(r == 0); 117 r = uv_prepare_start(&prepare, prepare_cb); 118 ASSERT(r == 0); 119 120 r = uv_async_init(uv_default_loop(), &async, async_cb); 121 ASSERT(r == 0); 122 123 r = uv_run(uv_default_loop(), UV_RUN_DEFAULT); 124 ASSERT(r == 0); 125 126 ASSERT(prepare_cb_called > 0); 127 ASSERT(async_cb_called == 3); 128 ASSERT(close_cb_called == 2); 129 130 ASSERT(0 == uv_thread_join(&thread)); 131 132 MAKE_VALGRIND_HAPPY(); 133 return 0; 134 } 135