libstdc++-v3/testsuite/20_util/shared_ptr/thread/default_weaktoshared.cc

   1 // Copyright (C) 2006-2014 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // 20.6.6.2 Template class shared_ptr [util.smartptr.shared]
  19
  20 // { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-gnu* *-*-solaris* *-*-cygwin *-*-darwin* } }
  21 // { dg-options "-pthread -std=gnu++0x" { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-gnu* } }
  22 // { dg-options "-pthreads -std=gnu++0x" { target *-*-solaris* } }
  23 // { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
  24
  25 #include <memory>
  26 #include <random>
  27 #include <vector>
  28 #include <testsuite_hooks.h>
  29 #include <iostream>
  30 #include <cstdlib>
  31
  32 #include <pthread.h>
  33
  34 #ifdef _GLIBCXX_HAVE_UNISTD_H
  35 #include <unistd.h>     // To test for _POSIX_THREAD_PRIORITY_SCHEDULING
  36 #endif
  37
  38 /* This (brute-force) tests the atomicity and thus thread safety of the
  39  * shared_ptr <- weak_ptr
  40  * assignment operation by allocating a test object, retrieving a weak
  41  * reference to it, and letting a number of threads repeatedly create strong
  42  * references from the weak reference.
  43  * Specifically, this tests the function _Sp_counted_base<true>::add_ref_lock()
  44  */
  45
  46
  47 const unsigned int HAMMER_MAX_THREADS = 10;
  48 const unsigned int POOL_SIZE = 1000;
  49 const unsigned long HAMMER_REPEAT = 100000;
  50 const unsigned long KILL_ONE_IN = 1000;
  51
  52 struct A
  53   {
  54     static _Atomic_word counter;
  55     A()
  56       {
  57         __gnu_cxx::__atomic_add(&counter, 1);
  58       }
  59     ~A()
  60       {
  61         __gnu_cxx::__atomic_add(&counter, -1);
  62       }
  63   };
  64
  65 _Atomic_word A::counter = 0;
  66
  67 typedef std::shared_ptr<A> sp_A_t;
  68 typedef std::weak_ptr<A> wp_A_t;
  69
  70 typedef std::vector<sp_A_t> sp_vector_t;
  71 typedef std::vector<wp_A_t> wp_vector_t;
  72
  73 struct shared_and_weak_pools
  74 {
  75   sp_vector_t& shared_pool;
  76   wp_vector_t& weak_pool;
  77
  78   shared_and_weak_pools(sp_vector_t& _shared_pool, wp_vector_t& _weak_pool)
  79     : shared_pool(_shared_pool), weak_pool(_weak_pool)
  80     { }
  81 };
  82
  83 void* thread_hammer_and_kill(void* opaque_pools)
  84 {
  85   shared_and_weak_pools& pools = *static_cast<shared_and_weak_pools*>(opaque_pools);
  86   // Using the same parameters as in the RNG test cases.
  87   std::mersenne_twister_engine<
  88     unsigned long, 32, 624, 397, 31,
  89     0x9908b0dful, 11,
  90     0xfffffffful, 7,
  91     0x9d2c5680ul, 15,
  92     0xefc60000ul, 18, 1812433253ul> rng;
  93
  94   sp_vector_t::iterator cur_shared = pools.shared_pool.begin();
  95   wp_vector_t::iterator cur_weak = pools.weak_pool.begin();
  96
  97   for (unsigned int i = 0; i < HAMMER_REPEAT; ++i)
  98     {
  99       try
 100       {
 101         sp_A_t strong(*cur_weak);
 102       }
 103       catch (std::bad_weak_ptr& exception)
 104       {
 105         ++cur_weak;
 106         if (cur_weak == pools.weak_pool.end())
 107           break;
 108       }
 109
 110       if (rng() % KILL_ONE_IN == 0)
 111       {
 112         cur_shared->reset();
 113         ++cur_shared;
 114       }
 115     }
 116   return 0;
 117 }
 118
 119 void* thread_hammer(void* opaque_weak)
 120 {
 121   wp_vector_t& weak_pool = *static_cast<wp_vector_t*>(opaque_weak);
 122   // Using the same parameters as in the RNG test cases.
 123   std::mersenne_twister_engine<
 124     unsigned long, 32, 624, 397, 31,
 125     0x9908b0dful, 11,
 126     0xfffffffful, 7,
 127     0x9d2c5680ul, 15,
 128     0xefc60000ul, 18, 1812433253ul> rng;
 129
 130   wp_vector_t::iterator cur_weak = weak_pool.begin();
 131
 132   for (unsigned int i = 0; i < HAMMER_REPEAT; ++i)
 133     {
 134       try
 135       {
 136         sp_A_t strong(*cur_weak);
 137       }
 138       catch (std::bad_weak_ptr& exception)
 139       {
 140         ++cur_weak;
 141         if (cur_weak == weak_pool.end())
 142           break;
 143       }
 144     }
 145   return 0;
 146 }
 147
 148 int
 149 test01()
 150 {
 151   bool test __attribute__((unused)) = true;
 152   sp_vector_t obj_pool(POOL_SIZE);
 153
 154   for(sp_vector_t::iterator cur = obj_pool.begin(); cur != obj_pool.end(); ++cur)
 155   {
 156     cur->reset(new A);
 157   }
 158   // Obtain weak references.
 159   std::vector<wp_vector_t> weak_pool(HAMMER_MAX_THREADS, wp_vector_t(obj_pool.begin(), obj_pool.end()));
 160
 161   // Launch threads with pointer to weak reference.
 162   pthread_t threads[HAMMER_MAX_THREADS];
 163 #if defined(__sun) && defined(__svr4__) && _XOPEN_VERSION >= 500
 164   pthread_setconcurrency (HAMMER_MAX_THREADS);
 165 #endif
 166
 167   pthread_attr_t tattr;
 168   pthread_attr_init(&tattr);
 169
 170   shared_and_weak_pools pools(obj_pool, weak_pool[0]);
 171   pthread_create(threads, &tattr, thread_hammer_and_kill, static_cast<void*>(&pools));
 172   for (unsigned int worker = 1; worker < HAMMER_MAX_THREADS; worker++)
 173     {
 174       if (pthread_create(&threads[worker], &tattr,
 175                          thread_hammer, static_cast<void*>(&weak_pool[worker])))
 176         std::abort();
 177     }
 178   // Wait for threads to complete, then check integrity of reference.
 179   void* status;
 180   for (unsigned int worker = 0; worker < HAMMER_MAX_THREADS; worker++)
 181     {
 182       if (pthread_join(threads[worker], &status))
 183         std::abort();
 184     }
 185   obj_pool.clear();
 186
 187   VERIFY( A::counter == 0 );
 188
 189   return 0;
 190 }
 191
 192 int
 193 main()
 194 {
 195   test01();
 196   return 0;
 197 }