Home | History | Annotate | Line # | Download | only in test 
      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 
     25 #include <stdio.h>
     26 #include <stdlib.h>
     27 
     28 static uv_cond_t condvar;
     29 static uv_mutex_t mutex;
     30 static uv_rwlock_t rwlock;
     31 static int step;
     32 
     33 /* The mutex and rwlock tests are really poor.
     34  * They're very basic sanity checks and nothing more.
     35  * Apologies if that rhymes.
     36  */
     37 
     38 TEST_IMPL(thread_mutex) {
     39   uv_mutex_t mutex;
     40   int r;
     41 
     42   r = uv_mutex_init(&mutex);
     43   ASSERT_OK(r);
     44 
     45   uv_mutex_lock(&mutex);
     46   uv_mutex_unlock(&mutex);
     47   uv_mutex_destroy(&mutex);
     48 
     49   return 0;
     50 }
     51 
     52 
     53 TEST_IMPL(thread_mutex_recursive) {
     54   uv_mutex_t mutex;
     55   int r;
     56 
     57   r = uv_mutex_init_recursive(&mutex);
     58   ASSERT_OK(r);
     59 
     60   uv_mutex_lock(&mutex);
     61   uv_mutex_lock(&mutex);
     62   ASSERT_OK(uv_mutex_trylock(&mutex));
     63 
     64   uv_mutex_unlock(&mutex);
     65   uv_mutex_unlock(&mutex);
     66   uv_mutex_unlock(&mutex);
     67   uv_mutex_destroy(&mutex);
     68 
     69   return 0;
     70 }
     71 
     72 
     73 TEST_IMPL(thread_rwlock) {
     74   uv_rwlock_t rwlock;
     75   int r;
     76 
     77   r = uv_rwlock_init(&rwlock);
     78   ASSERT_OK(r);
     79 
     80   uv_rwlock_rdlock(&rwlock);
     81   uv_rwlock_rdunlock(&rwlock);
     82   uv_rwlock_wrlock(&rwlock);
     83   uv_rwlock_wrunlock(&rwlock);
     84   uv_rwlock_destroy(&rwlock);
     85 
     86   return 0;
     87 }
     88 
     89 
     90 /* Call when holding |mutex|. */
     91 static void synchronize_nowait(void) {
     92   step += 1;
     93   uv_cond_signal(&condvar);
     94 }
     95 
     96 
     97 /* Call when holding |mutex|. */
     98 static void synchronize(void) {
     99   int current;
    100 
    101   synchronize_nowait();
    102   /* Wait for the other thread.  Guard against spurious wakeups. */
    103   for (current = step; current == step; uv_cond_wait(&condvar, &mutex));
    104   ASSERT_EQ(step, current + 1);
    105 }
    106 
    107 
    108 static void thread_rwlock_trylock_peer(void* unused) {
    109   (void) &unused;
    110 
    111   uv_mutex_lock(&mutex);
    112 
    113   /* Write lock held by other thread. */
    114   ASSERT_EQ(UV_EBUSY, uv_rwlock_tryrdlock(&rwlock));
    115   ASSERT_EQ(UV_EBUSY, uv_rwlock_trywrlock(&rwlock));
    116   synchronize();
    117 
    118   /* Read lock held by other thread. */
    119   ASSERT_OK(uv_rwlock_tryrdlock(&rwlock));
    120   uv_rwlock_rdunlock(&rwlock);
    121   ASSERT_EQ(UV_EBUSY, uv_rwlock_trywrlock(&rwlock));
    122   synchronize();
    123 
    124   /* Acquire write lock. */
    125   ASSERT_OK(uv_rwlock_trywrlock(&rwlock));
    126   synchronize();
    127 
    128   /* Release write lock and acquire read lock. */
    129   uv_rwlock_wrunlock(&rwlock);
    130   ASSERT_OK(uv_rwlock_tryrdlock(&rwlock));
    131   synchronize();
    132 
    133   uv_rwlock_rdunlock(&rwlock);
    134   synchronize_nowait();  /* Signal main thread we're going away. */
    135   uv_mutex_unlock(&mutex);
    136 }
    137 
    138 
    139 TEST_IMPL(thread_rwlock_trylock) {
    140   uv_thread_t thread;
    141 
    142   ASSERT_OK(uv_cond_init(&condvar));
    143   ASSERT_OK(uv_mutex_init(&mutex));
    144   ASSERT_OK(uv_rwlock_init(&rwlock));
    145 
    146   uv_mutex_lock(&mutex);
    147   ASSERT_OK(uv_thread_create(&thread, thread_rwlock_trylock_peer, NULL));
    148 
    149   /* Hold write lock. */
    150   ASSERT_OK(uv_rwlock_trywrlock(&rwlock));
    151   synchronize();  /* Releases the mutex to the other thread. */
    152 
    153   /* Release write lock and acquire read lock.  Pthreads doesn't support
    154    * the notion of upgrading or downgrading rwlocks, so neither do we.
    155    */
    156   uv_rwlock_wrunlock(&rwlock);
    157   ASSERT_OK(uv_rwlock_tryrdlock(&rwlock));
    158   synchronize();
    159 
    160   /* Release read lock. */
    161   uv_rwlock_rdunlock(&rwlock);
    162   synchronize();
    163 
    164   /* Write lock held by other thread. */
    165   ASSERT_EQ(UV_EBUSY, uv_rwlock_tryrdlock(&rwlock));
    166   ASSERT_EQ(UV_EBUSY, uv_rwlock_trywrlock(&rwlock));
    167   synchronize();
    168 
    169   /* Read lock held by other thread. */
    170   ASSERT_OK(uv_rwlock_tryrdlock(&rwlock));
    171   uv_rwlock_rdunlock(&rwlock);
    172   ASSERT_EQ(UV_EBUSY, uv_rwlock_trywrlock(&rwlock));
    173   synchronize();
    174 
    175   ASSERT_OK(uv_thread_join(&thread));
    176   uv_rwlock_destroy(&rwlock);
    177   uv_mutex_unlock(&mutex);
    178   uv_mutex_destroy(&mutex);
    179   uv_cond_destroy(&condvar);
    180 
    181   return 0;
    182 }
    183