1 // Copyright (C) 2006, 2007, 2008 Free Software Foundation
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)
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.
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,
19 // 20.6.6.2 Template class shared_ptr [util.smartptr.shared]
21 // { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* alpha*-*-osf* mips-sgi-irix6* } }
22 // { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* alpha*-*-osf* mips-sgi-irix6* } }
23 // { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } }
24 // { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
29 #include <testsuite_hooks.h>
35 #ifdef _GLIBCXX_HAVE_UNISTD_H
36 #include <unistd.h> // To test for _POSIX_THREAD_PRIORITY_SCHEDULING
39 /* This (brute-force) tests the atomicity and thus thread safety of the
40 * shared_ptr <- weak_ptr
41 * assignment operation by allocating a test object, retrieving a weak
42 * reference to it, and letting a number of threads repeatedly create strong
43 * references from the weak reference.
44 * Specifically, this tests the function _Sp_counted_base<true>::add_ref_lock()
48 const unsigned int HAMMER_MAX_THREADS
= 10;
49 const unsigned int POOL_SIZE
= 1000;
50 const unsigned long HAMMER_REPEAT
= 100000;
51 const unsigned long KILL_ONE_IN
= 1000;
55 static _Atomic_word counter
;
58 __gnu_cxx::__atomic_add(&counter
, 1);
62 __gnu_cxx::__atomic_add(&counter
, -1);
66 _Atomic_word
A::counter
= 0;
70 typedef std::__shared_ptr
<A
, _S_mutex
> sp_A_t
;
71 typedef std::__weak_ptr
<A
, _S_mutex
> wp_A_t
;
73 typedef std::vector
<sp_A_t
> sp_vector_t
;
74 typedef std::vector
<wp_A_t
> wp_vector_t
;
76 struct shared_and_weak_pools
78 sp_vector_t
& shared_pool
;
79 wp_vector_t
& weak_pool
;
81 shared_and_weak_pools(sp_vector_t
& _shared_pool
, wp_vector_t
& _weak_pool
)
82 : shared_pool(_shared_pool
), weak_pool(_weak_pool
)
86 void* thread_hammer_and_kill(void* opaque_pools
)
88 shared_and_weak_pools
& pools
= *static_cast<shared_and_weak_pools
*>(opaque_pools
);
89 // Using the same parameters as in the RNG test cases.
90 std::mersenne_twister
<
91 unsigned long, 32, 624, 397, 31,
94 0xefc60000ul
, 18> rng
;
96 sp_vector_t::iterator cur_shared
= pools
.shared_pool
.begin();
97 wp_vector_t::iterator cur_weak
= pools
.weak_pool
.begin();
99 for (unsigned int i
= 0; i
< HAMMER_REPEAT
; ++i
)
103 sp_A_t
strong(*cur_weak
);
105 catch (std::bad_weak_ptr
& exception
)
108 if (cur_weak
== pools
.weak_pool
.end())
112 if (rng() % KILL_ONE_IN
== 0)
121 void* thread_hammer(void* opaque_weak
)
123 wp_vector_t
& weak_pool
= *static_cast<wp_vector_t
*>(opaque_weak
);
124 // Using the same parameters as in the RNG test cases.
125 std::mersenne_twister
<
126 unsigned long, 32, 624, 397, 31,
129 0xefc60000ul
, 18> rng
;
130 wp_vector_t::iterator cur_weak
= weak_pool
.begin();
132 for (unsigned int i
= 0; i
< HAMMER_REPEAT
; ++i
)
136 sp_A_t
strong(*cur_weak
);
138 catch (std::bad_weak_ptr
& exception
)
141 if (cur_weak
== weak_pool
.end())
151 bool test
__attribute__((unused
)) = true;
152 sp_vector_t
obj_pool(POOL_SIZE
);
154 for(sp_vector_t::iterator cur
= obj_pool
.begin(); cur
!= obj_pool
.end(); ++cur
)
158 // Obtain weak references.
159 std::vector
<wp_vector_t
> weak_pool(HAMMER_MAX_THREADS
, wp_vector_t(obj_pool
.begin(), obj_pool
.end()));
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
);
167 pthread_attr_t tattr
;
168 pthread_attr_init(&tattr
);
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
++)
174 if (pthread_create(&threads
[worker
], &tattr
,
175 thread_hammer
, static_cast<void*>(&weak_pool
[worker
])))
178 // Wait for threads to complete, then check integrity of reference.
180 for (unsigned int worker
= 0; worker
< HAMMER_MAX_THREADS
; worker
++)
182 if (pthread_join(threads
[worker
], &status
))
187 VERIFY( A::counter
== 0 );