tests/test-rfifolock.c

   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 "qemu/osdep.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 }