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

   1 // Copyright (C) 2006, 2007 Free Software Foundation
   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 2, 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 COPYING.  If not, write to the Free
  16 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  17 // USA.
  18
  19 // 20.6.6.2 Template class shared_ptr [util.smartptr.shared]
  20
  21 // { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* alpha*-*-osf* mips-sgi-irix6* } }
  22 // { dg-options "-pthread -std=gnu++0x" { target *-*-freebsd* *-*-netbsd* *-*-linux* alpha*-*-osf* mips-sgi-irix6* } }
  23 // { dg-options "-pthreads -std=gnu++0x" { target *-*-solaris* } }
  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<
  88     unsigned long, 32, 624, 397, 31,
  89     0x9908b0dful, 11, 7,
  90     0x9d2c5680ul, 15,
  91     0xefc60000ul, 18> rng;
  92
  93   sp_vector_t::iterator cur_shared = pools.shared_pool.begin();
  94   wp_vector_t::iterator cur_weak = pools.weak_pool.begin();
  95
  96   for (unsigned int i = 0; i < HAMMER_REPEAT; ++i)
  97     {
  98       try
  99       {
 100         sp_A_t strong(*cur_weak);
 101       }
 102       catch (std::bad_weak_ptr& exception)
 103       {
 104         ++cur_weak;
 105         if (cur_weak == pools.weak_pool.end())
 106           break;
 107       }
 108
 109       if (rng() % KILL_ONE_IN == 0)
 110       {
 111         cur_shared->reset();
 112         ++cur_shared;
 113       }
 114     }
 115   return 0;
 116 }
 117
 118 void* thread_hammer(void* opaque_weak)
 119 {
 120   wp_vector_t& weak_pool = *static_cast<wp_vector_t*>(opaque_weak);
 121   // Using the same parameters as in the RNG test cases.
 122   std::mersenne_twister<
 123     unsigned long, 32, 624, 397, 31,
 124     0x9908b0dful, 11, 7,
 125     0x9d2c5680ul, 15,
 126     0xefc60000ul, 18> rng;
 127   wp_vector_t::iterator cur_weak = weak_pool.begin();
 128
 129   for (unsigned int i = 0; i < HAMMER_REPEAT; ++i)
 130     {
 131       try
 132       {
 133         sp_A_t strong(*cur_weak);
 134       }
 135       catch (std::bad_weak_ptr& exception)
 136       {
 137         ++cur_weak;
 138         if (cur_weak == weak_pool.end())
 139           break;
 140       }
 141     }
 142   return 0;
 143 }
 144
 145 int
 146 test01()
 147 {
 148   bool test __attribute__((unused)) = true;
 149   sp_vector_t obj_pool(POOL_SIZE);
 150
 151   for(sp_vector_t::iterator cur = obj_pool.begin(); cur != obj_pool.end(); ++cur)
 152   {
 153     cur->reset(new A);
 154   }
 155   // Obtain weak references.
 156   std::vector<wp_vector_t> weak_pool(HAMMER_MAX_THREADS, wp_vector_t(obj_pool.begin(), obj_pool.end()));
 157
 158   // Launch threads with pointer to weak reference.
 159   pthread_t threads[HAMMER_MAX_THREADS];
 160 #if defined(__sun) && defined(__svr4__) && _XOPEN_VERSION >= 500
 161   pthread_setconcurrency (HAMMER_MAX_THREADS);
 162 #endif
 163
 164   pthread_attr_t tattr;
 165   int ret = pthread_attr_init(&tattr);
 166
 167   shared_and_weak_pools pools(obj_pool, weak_pool[0]);
 168   pthread_create(threads, &tattr, thread_hammer_and_kill, static_cast<void*>(&pools));
 169   for (unsigned int worker = 1; worker < HAMMER_MAX_THREADS; worker++)
 170     {
 171       if (pthread_create(&threads[worker], &tattr,
 172                          thread_hammer, static_cast<void*>(&weak_pool[worker])))
 173         std::abort();
 174     }
 175   // Wait for threads to complete, then check integrity of reference.
 176   void* status;
 177   for (unsigned int worker = 0; worker < HAMMER_MAX_THREADS; worker++)
 178     {
 179       if (pthread_join(threads[worker], &status))
 180         std::abort();
 181     }
 182   obj_pool.clear();
 183
 184   VERIFY( A::counter == 0 );
 185
 186   return 0;
 187 }
 188
 189 int
 190 main()
 191 {
 192   test01();
 193   return 0;
 194 }