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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <mutex>
// template <class Mutex> class unique_lock;
// bool try_lock();
#include <mutex>
#include <cassert>
bool try_lock_called = false;
struct mutex
{
bool try_lock()
{
try_lock_called = !try_lock_called;
return try_lock_called;
}
void unlock() {}
};
mutex m;
int main()
{
std::unique_lock<mutex> lk(m, std::defer_lock);
assert(lk.try_lock() == true);
assert(try_lock_called == true);
assert(lk.owns_lock() == true);
try
{
lk.try_lock();
assert(false);
}
catch (std::system_error& e)
{
assert(e.code().value() == EDEADLK);
}
lk.unlock();
assert(lk.try_lock() == false);
assert(try_lock_called == false);
assert(lk.owns_lock() == false);
lk.release();
try
{
lk.try_lock();
assert(false);
}
catch (std::system_error& e)
{
assert(e.code().value() == EPERM);
}
}
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