e9d5842ac7
This is a follow up to https://github.com/llvm/llvm-project/pull/98717, which made lock_guard available under _LIBCPP_HAS_NO_THREADS. We can make unique_lock available under similar circumstances. This patch follows the example in #98717, by: - Removing the preprocessor guards for _LIBCPP_HAS_NO_THREADS in the unique_lock header. - providing a set of custom mutex implementations in a local header. - using custom locks in tests that can be made to work under `no-threads`.
82 lines
1.7 KiB
C++
82 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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: no-threads
|
|
// UNSUPPORTED: c++03
|
|
// ALLOW_RETRIES: 2
|
|
|
|
// <mutex>
|
|
|
|
// template <class Mutex> class unique_lock;
|
|
|
|
// void lock();
|
|
|
|
#include <cassert>
|
|
#include <chrono>
|
|
#include <cstdlib>
|
|
#include <mutex>
|
|
#include <system_error>
|
|
#include <thread>
|
|
|
|
#include "make_test_thread.h"
|
|
#include "test_macros.h"
|
|
|
|
std::mutex m;
|
|
|
|
typedef std::chrono::system_clock Clock;
|
|
typedef Clock::time_point time_point;
|
|
typedef Clock::duration duration;
|
|
typedef std::chrono::milliseconds ms;
|
|
typedef std::chrono::nanoseconds ns;
|
|
|
|
void f()
|
|
{
|
|
std::unique_lock<std::mutex> lk(m, std::defer_lock);
|
|
time_point t0 = Clock::now();
|
|
lk.lock();
|
|
time_point t1 = Clock::now();
|
|
assert(lk.owns_lock() == true);
|
|
ns d = t1 - t0 - ms(250);
|
|
assert(d < ms(25)); // within 25ms
|
|
#ifndef TEST_HAS_NO_EXCEPTIONS
|
|
try
|
|
{
|
|
lk.lock();
|
|
assert(false);
|
|
}
|
|
catch (std::system_error& e)
|
|
{
|
|
assert(e.code() == std::errc::resource_deadlock_would_occur);
|
|
}
|
|
#endif
|
|
lk.unlock();
|
|
lk.release();
|
|
#ifndef TEST_HAS_NO_EXCEPTIONS
|
|
try
|
|
{
|
|
lk.lock();
|
|
assert(false);
|
|
}
|
|
catch (std::system_error& e)
|
|
{
|
|
assert(e.code() == std::errc::operation_not_permitted);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
int main(int, char**)
|
|
{
|
|
m.lock();
|
|
std::thread t = support::make_test_thread(f);
|
|
std::this_thread::sleep_for(ms(250));
|
|
m.unlock();
|
|
t.join();
|
|
|
|
return 0;
|
|
}
|