1 // Test whether no race conditions are reported on std::thread. Note: since 2 // the implementation of std::thread uses the shared pointer implementation, 3 // that implementation has to be annotated in order to avoid false positives. 4 // See also http://gcc.gnu.org/onlinedocs/libstdc++/manual/debug.html for more 5 // information. 6 7 #include "../../drd/drd.h" 8 #define _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(addr) \ 9 ANNOTATE_HAPPENS_BEFORE(addr) 10 #define _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(addr) \ 11 ANNOTATE_HAPPENS_AFTER(addr) 12 13 #include <iostream> 14 #include <thread> 15 #include <unistd.h> 16 17 static int i; 18 19 int main(int argc, char** argv) 20 { 21 std::thread t1( []() { sleep(1); i = 1; } ); 22 std::thread t2( []() { i = 2; } ); 23 t2.join(); 24 t1.join(); 25 std::cerr << "Done.\n"; 26 return 0; 27 } 28 29 // 30 // From libstdc++-v3/src/c++11/thread.cc 31 // 32 33 extern "C" void* execute_native_thread_routine(void* __p) 34 { 35 std::thread::_Impl_base* __t = static_cast<std::thread::_Impl_base*>(__p); 36 std::thread::__shared_base_type __local; 37 __local.swap(__t->_M_this_ptr); 38 39 __try { 40 __t->_M_run(); 41 } __catch(const __cxxabiv1::__forced_unwind&) { 42 __throw_exception_again; 43 } __catch(...) { 44 std::terminate(); 45 } 46 47 return 0; 48 } 49 50 #include <system_error> 51 52 namespace std 53 { 54 void thread::_M_start_thread(__shared_base_type __b) 55 { 56 if (!__gthread_active_p()) 57 #if __EXCEPTIONS 58 throw system_error(make_error_code(errc::operation_not_permitted), 59 "Enable multithreading to use std::thread"); 60 #else 61 __throw_system_error(int(errc::operation_not_permitted)); 62 #endif 63 64 __b->_M_this_ptr = __b; 65 int __e = __gthread_create(&_M_id._M_thread, execute_native_thread_routine, 66 __b.get()); 67 if (__e) { 68 __b->_M_this_ptr.reset(); 69 __throw_system_error(__e); 70 } 71 } 72 } 73
