Stefan Hajnoczi | 2da61b6 | 2014-03-03 11:30:03 +0100 | [diff] [blame] | 1 | /* |
| 2 | * RFifoLock tests |
| 3 | * |
| 4 | * Copyright Red Hat, Inc. 2013 |
| 5 | * |
| 6 | * Authors: |
| 7 | * Stefan Hajnoczi <stefanha@redhat.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU LGPL, version 2 or later. |
| 10 | * See the COPYING.LIB file in the top-level directory. |
| 11 | */ |
| 12 | |
| 13 | #include <glib.h> |
| 14 | #include "qemu-common.h" |
| 15 | #include "qemu/rfifolock.h" |
| 16 | |
| 17 | static void test_nesting(void) |
| 18 | { |
| 19 | RFifoLock lock; |
| 20 | |
| 21 | /* Trivial test, ensure the lock is recursive */ |
| 22 | rfifolock_init(&lock, NULL, NULL); |
| 23 | rfifolock_lock(&lock); |
| 24 | rfifolock_lock(&lock); |
| 25 | rfifolock_lock(&lock); |
| 26 | rfifolock_unlock(&lock); |
| 27 | rfifolock_unlock(&lock); |
| 28 | rfifolock_unlock(&lock); |
| 29 | rfifolock_destroy(&lock); |
| 30 | } |
| 31 | |
| 32 | typedef struct { |
| 33 | RFifoLock lock; |
| 34 | int fd[2]; |
| 35 | } CallbackTestData; |
| 36 | |
| 37 | static void rfifolock_cb(void *opaque) |
| 38 | { |
| 39 | CallbackTestData *data = opaque; |
| 40 | int ret; |
| 41 | char c = 0; |
| 42 | |
| 43 | ret = write(data->fd[1], &c, sizeof(c)); |
| 44 | g_assert(ret == 1); |
| 45 | } |
| 46 | |
| 47 | static void *callback_thread(void *opaque) |
| 48 | { |
| 49 | CallbackTestData *data = opaque; |
| 50 | |
| 51 | /* The other thread holds the lock so the contention callback will be |
| 52 | * invoked... |
| 53 | */ |
| 54 | rfifolock_lock(&data->lock); |
| 55 | rfifolock_unlock(&data->lock); |
| 56 | return NULL; |
| 57 | } |
| 58 | |
| 59 | static void test_callback(void) |
| 60 | { |
| 61 | CallbackTestData data; |
| 62 | QemuThread thread; |
| 63 | int ret; |
| 64 | char c; |
| 65 | |
| 66 | rfifolock_init(&data.lock, rfifolock_cb, &data); |
| 67 | ret = qemu_pipe(data.fd); |
| 68 | g_assert(ret == 0); |
| 69 | |
| 70 | /* Hold lock but allow the callback to kick us by writing to the pipe */ |
| 71 | rfifolock_lock(&data.lock); |
| 72 | qemu_thread_create(&thread, "callback_thread", |
| 73 | callback_thread, &data, QEMU_THREAD_JOINABLE); |
| 74 | ret = read(data.fd[0], &c, sizeof(c)); |
| 75 | g_assert(ret == 1); |
| 76 | rfifolock_unlock(&data.lock); |
| 77 | /* If we got here then the callback was invoked, as expected */ |
| 78 | |
| 79 | qemu_thread_join(&thread); |
| 80 | close(data.fd[0]); |
| 81 | close(data.fd[1]); |
| 82 | rfifolock_destroy(&data.lock); |
| 83 | } |
| 84 | |
| 85 | int main(int argc, char **argv) |
| 86 | { |
| 87 | g_test_init(&argc, &argv, NULL); |
| 88 | g_test_add_func("/nesting", test_nesting); |
| 89 | g_test_add_func("/callback", test_callback); |
| 90 | return g_test_run(); |
| 91 | } |