74 lines
1.6 KiB
C++
74 lines
1.6 KiB
C++
// -*-c++-*-
|
|
// vim: set ft=cpp:
|
|
|
|
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
|
|
file Copyright.txt or https://cmake.org/licensing for details. */
|
|
#pragma once
|
|
|
|
#if __cplusplus >= 201402L || defined(_MSVC_LANG) && _MSVC_LANG >= 201402L
|
|
# define CMake_HAVE_CXX_SHARED_LOCK
|
|
#endif
|
|
#if __cplusplus >= 201703L || defined(_MSVC_LANG) && _MSVC_LANG >= 201703L
|
|
# define CMake_HAVE_CXX_SHARED_MUTEX
|
|
#endif
|
|
|
|
#if defined(CMake_HAVE_CXX_SHARED_LOCK)
|
|
# include <shared_mutex> // IWYU pragma: export
|
|
#endif
|
|
#if !defined(CMake_HAVE_CXX_SHARED_MUTEX)
|
|
# include <cm3p/uv.h>
|
|
#endif
|
|
|
|
namespace cm {
|
|
#if defined(CMake_HAVE_CXX_SHARED_MUTEX)
|
|
using std::shared_mutex;
|
|
#else
|
|
class shared_mutex
|
|
{
|
|
uv_rwlock_t _M_;
|
|
|
|
public:
|
|
using native_handle_type = uv_rwlock_t*;
|
|
|
|
shared_mutex() { uv_rwlock_init(&_M_); }
|
|
~shared_mutex() { uv_rwlock_destroy(&_M_); }
|
|
|
|
shared_mutex(shared_mutex const&) = delete;
|
|
shared_mutex& operator=(shared_mutex const&) = delete;
|
|
|
|
void lock() { uv_rwlock_wrlock(&_M_); }
|
|
bool try_lock() { return uv_rwlock_trywrlock(&_M_) == 0; }
|
|
void unlock() { uv_rwlock_wrunlock(&_M_); }
|
|
|
|
void lock_shared() { uv_rwlock_rdlock(&_M_); }
|
|
void unlock_shared() { uv_rwlock_rdunlock(&_M_); }
|
|
|
|
native_handle_type native_handle() { return &_M_; }
|
|
};
|
|
#endif
|
|
|
|
#if defined(CMake_HAVE_CXX_SHARED_LOCK)
|
|
using std::shared_lock;
|
|
#else
|
|
template <typename T>
|
|
class shared_lock
|
|
{
|
|
T& _mutex;
|
|
|
|
public:
|
|
using mutex_type = T;
|
|
|
|
shared_lock(T& m)
|
|
: _mutex(m)
|
|
{
|
|
_mutex.lock_shared();
|
|
}
|
|
|
|
~shared_lock() { _mutex.unlock_shared(); }
|
|
|
|
shared_lock(shared_lock const&) = delete;
|
|
shared_lock& operator=(shared_lock const&) = delete;
|
|
};
|
|
#endif
|
|
}
|