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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// <thread>
// class thread
// template <class F, class ...Args> thread(F&& f, Args&&... args);
// UNSUPPORTED: sanitizer-new-delete
#include <thread>
#include <new>
#include <atomic>
#include <cstdlib>
#include <cassert>
#include <vector>
#include "test_macros.h"
std::atomic<unsigned> throw_one(0xFFFF);
std::atomic<unsigned> outstanding_new(0);
void* operator new(std::size_t s) TEST_THROW_SPEC(std::bad_alloc)
{
unsigned expected = throw_one;
do {
if (expected == 0) TEST_THROW(std::bad_alloc());
} while (!throw_one.compare_exchange_weak(expected, expected - 1));
++outstanding_new;
void* ret = std::malloc(s);
if (!ret) std::abort(); // placate MSVC's unchecked malloc warning
return ret;
}
void operator delete(void* p) TEST_NOEXCEPT
{
if (!p) return;
--outstanding_new;
std::free(p);
}
bool f_run = false;
struct F {
std::vector<int> v_; // so f's copy-ctor calls operator new
explicit F() : v_(10) {}
void operator()() const { f_run = true; }
};
F f;
class G
{
int alive_;
public:
static int n_alive;
static bool op_run;
G() : alive_(1) {++n_alive;}
G(const G& g) : alive_(g.alive_) {++n_alive;}
~G() {alive_ = 0; --n_alive;}
void operator()()
{
assert(alive_ == 1);
assert(n_alive >= 1);
op_run = true;
}
void operator()(int i, double j)
{
assert(alive_ == 1);
assert(n_alive >= 1);
assert(i == 5);
assert(j == 5.5);
op_run = true;
}
};
int G::n_alive = 0;
bool G::op_run = false;
#if TEST_STD_VER >= 11
class MoveOnly
{
MoveOnly(const MoveOnly&);
public:
MoveOnly() {}
MoveOnly(MoveOnly&&) {}
void operator()(MoveOnly&&)
{
}
};
#endif
// Test throwing std::bad_alloc
//-----------------------------
// Concerns:
// A Each allocation performed during thread construction should be performed
// in the parent thread so that std::terminate is not called if
// std::bad_alloc is thrown by new.
// B std::thread's constructor should properly handle exceptions and not leak
// memory.
// Plan:
// 1 Create a thread and count the number of allocations, 'numAllocs', it
// performs.
// 2 For each allocation performed run a test where that allocation throws.
// 2.1 check that the exception can be caught in the parent thread.
// 2.2 Check that the functor has not been called.
// 2.3 Check that no memory allocated by the creation of the thread is leaked.
// 3 Finally check that a thread runs successfully if we throw after
// 'numAllocs + 1' allocations.
int numAllocs;
void test_throwing_new_during_thread_creation() {
#ifndef TEST_HAS_NO_EXCEPTIONS
throw_one = 0xFFF;
{
std::thread t(f);
t.join();
}
numAllocs = 0xFFF - throw_one;
// i <= numAllocs means the last iteration is expected not to throw.
for (int i=0; i <= numAllocs; ++i) {
throw_one = i;
f_run = false;
TEST_NOT_WIN32_DLL(unsigned old_outstanding = outstanding_new);
try {
std::thread t(f);
assert(i == numAllocs); // Only final iteration will not throw.
t.join();
assert(f_run);
} catch (std::bad_alloc const&) {
assert(i < numAllocs);
assert(!f_run); // (2.2)
}
// In DLL builds on Windows, the overridden operators new/delete won't
// override calls from within the DLL, so this won't match.
TEST_NOT_WIN32_DLL(assert(old_outstanding == outstanding_new)); // (2.3)
}
f_run = false;
throw_one = 0xFFF;
#endif
}
int main(int, char**)
{
test_throwing_new_during_thread_creation();
{
std::thread t(f);
t.join();
assert(f_run == true);
}
{
assert(G::n_alive == 0);
assert(!G::op_run);
{
G g;
std::thread t(g);
t.join();
}
assert(G::n_alive == 0);
assert(G::op_run);
}
G::op_run = false;
#ifndef TEST_HAS_NO_EXCEPTIONS
// The test below expects `std::thread` to call `new`, which may not be the
// case for all implementations.
LIBCPP_ASSERT(numAllocs > 0); // libc++ should call new.
if (numAllocs > 0) {
try
{
throw_one = 0;
assert(G::n_alive == 0);
assert(!G::op_run);
std::thread t((G()));
assert(false);
}
catch (std::bad_alloc const&)
{
throw_one = 0xFFFF;
assert(G::n_alive == 0);
assert(!G::op_run);
}
}
#endif
#if TEST_STD_VER >= 11
{
assert(G::n_alive == 0);
assert(!G::op_run);
{
G g;
std::thread t(g, 5, 5.5);
t.join();
}
assert(G::n_alive == 0);
assert(G::op_run);
}
{
std::thread t = std::thread(MoveOnly(), MoveOnly());
t.join();
}
#endif
return 0;
}
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