--- /dev/null
+// Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+// 20.6.6.2 Template class shared_ptr [util.smartptr.shared]
+
+// { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* alpha*-*-osf* mips-sgi-irix6* } }
+// { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* alpha*-*-osf* mips-sgi-irix6* } }
+// { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } }
+// { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
+
+#include <memory>
+#include <random>
+#include <vector>
+#include <testsuite_hooks.h>
+#include <iostream>
+#include <cstdlib>
+
+#include <pthread.h>
+
+#ifdef _GLIBCXX_HAVE_UNISTD_H
+#include <unistd.h> // To test for _POSIX_THREAD_PRIORITY_SCHEDULING
+#endif
+
+/* This (brute-force) tests the atomicity and thus thread safety of the
+ * shared_ptr <- weak_ptr
+ * assignment operation by allocating a test object, retrieving a weak
+ * reference to it, and letting a number of threads repeatedly create strong
+ * references from the weak reference.
+ * Specifically, this tests the function _Sp_counted_base<true>::add_ref_lock()
+ */
+
+
+const unsigned int HAMMER_MAX_THREADS = 10;
+const unsigned int POOL_SIZE = 1000;
+const unsigned long HAMMER_REPEAT = 100000;
+const unsigned long KILL_ONE_IN = 1000;
+
+struct A
+ {
+ static _Atomic_word counter;
+ A()
+ {
+ __gnu_cxx::__atomic_add(&counter, 1);
+ }
+ ~A()
+ {
+ __gnu_cxx::__atomic_add(&counter, -1);
+ }
+ };
+
+_Atomic_word A::counter = 0;
+
+using std::_S_mutex;
+
+typedef std::__shared_ptr<A, _S_mutex> sp_A_t;
+typedef std::__weak_ptr<A, _S_mutex> wp_A_t;
+
+typedef std::vector<sp_A_t> sp_vector_t;
+typedef std::vector<wp_A_t> wp_vector_t;
+
+struct shared_and_weak_pools
+{
+ sp_vector_t& shared_pool;
+ wp_vector_t& weak_pool;
+
+ shared_and_weak_pools(sp_vector_t& _shared_pool, wp_vector_t& _weak_pool)
+ : shared_pool(_shared_pool), weak_pool(_weak_pool)
+ { }
+};
+
+void* thread_hammer_and_kill(void* opaque_pools)
+{
+ shared_and_weak_pools& pools = *static_cast<shared_and_weak_pools*>(opaque_pools);
+ // Using the same parameters as in the RNG test cases.
+ std::mersenne_twister<
+ unsigned long, 32, 624, 397, 31,
+ 0x9908b0dful, 11, 7,
+ 0x9d2c5680ul, 15,
+ 0xefc60000ul, 18> rng;
+
+ sp_vector_t::iterator cur_shared = pools.shared_pool.begin();
+ wp_vector_t::iterator cur_weak = pools.weak_pool.begin();
+
+ for (unsigned int i = 0; i < HAMMER_REPEAT; ++i)
+ {
+ try
+ {
+ sp_A_t strong(*cur_weak);
+ }
+ catch (std::bad_weak_ptr& exception)
+ {
+ ++cur_weak;
+ if (cur_weak == pools.weak_pool.end())
+ break;
+ }
+
+ if (rng() % KILL_ONE_IN == 0)
+ {
+ cur_shared->reset();
+ ++cur_shared;
+ }
+ }
+ return 0;
+}
+
+void* thread_hammer(void* opaque_weak)
+{
+ wp_vector_t& weak_pool = *static_cast<wp_vector_t*>(opaque_weak);
+ // Using the same parameters as in the RNG test cases.
+ std::mersenne_twister<
+ unsigned long, 32, 624, 397, 31,
+ 0x9908b0dful, 11, 7,
+ 0x9d2c5680ul, 15,
+ 0xefc60000ul, 18> rng;
+ wp_vector_t::iterator cur_weak = weak_pool.begin();
+
+ for (unsigned int i = 0; i < HAMMER_REPEAT; ++i)
+ {
+ try
+ {
+ sp_A_t strong(*cur_weak);
+ }
+ catch (std::bad_weak_ptr& exception)
+ {
+ ++cur_weak;
+ if (cur_weak == weak_pool.end())
+ break;
+ }
+ }
+ return 0;
+}
+
+int
+test01()
+{
+ bool test __attribute__((unused)) = true;
+ sp_vector_t obj_pool(POOL_SIZE);
+
+ for(sp_vector_t::iterator cur = obj_pool.begin(); cur != obj_pool.end(); ++cur)
+ {
+ cur->reset(new A);
+ }
+ // Obtain weak references.
+ std::vector<wp_vector_t> weak_pool(HAMMER_MAX_THREADS, wp_vector_t(obj_pool.begin(), obj_pool.end()));
+
+ // Launch threads with pointer to weak reference.
+ pthread_t threads[HAMMER_MAX_THREADS];
+#if defined(__sun) && defined(__svr4__) && _XOPEN_VERSION >= 500
+ pthread_setconcurrency (HAMMER_MAX_THREADS);
+#endif
+
+ pthread_attr_t tattr;
+ pthread_attr_init(&tattr);
+
+ shared_and_weak_pools pools(obj_pool, weak_pool[0]);
+ pthread_create(threads, &tattr, thread_hammer_and_kill, static_cast<void*>(&pools));
+ for (unsigned int worker = 1; worker < HAMMER_MAX_THREADS; worker++)
+ {
+ if (pthread_create(&threads[worker], &tattr,
+ thread_hammer, static_cast<void*>(&weak_pool[worker])))
+ std::abort();
+ }
+ // Wait for threads to complete, then check integrity of reference.
+ void* status;
+ for (unsigned int worker = 0; worker < HAMMER_MAX_THREADS; worker++)
+ {
+ if (pthread_join(threads[worker], &status))
+ std::abort();
+ }
+ obj_pool.clear();
+
+ VERIFY( A::counter == 0 );
+
+ return 0;
+}
+
+int
+main()
+{
+ test01();
+ return 0;
+}
projects / msp430-gcc.git / blobdiff