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/***
* Copyright (C) Microsoft. All rights reserved.
* Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
*
* =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
*
* Parallel Patterns Library implementation (common code across platforms)
*
* For the latest on this and related APIs, please see: https://github.com/Microsoft/cpprestsdk
*
* =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
****/
#include "stdafx.h"
#if !defined(_WIN32) || _MSC_VER < 1800 || CPPREST_FORCE_PPLX
#include "pplx/pplx.h"
// Disable false alarm code analyze warning
#if defined(_MSC_VER)
#pragma warning (disable : 26165 26110)
#endif
namespace pplx
{
namespace details
{
/// <summary>
/// Spin lock to allow for locks to be used in global scope
/// </summary>
class _Spin_lock
{
public:
_Spin_lock()
: _M_lock(0)
{
}
void lock()
{
if ( details::atomic_compare_exchange(_M_lock, 1l, 0l) != 0l )
{
do
{
pplx::details::platform::YieldExecution();
} while ( details::atomic_compare_exchange(_M_lock, 1l, 0l) != 0l );
}
}
void unlock()
{
// fence for release semantics
details::atomic_exchange(_M_lock, 0l);
}
private:
atomic_long _M_lock;
};
typedef ::pplx::scoped_lock<_Spin_lock> _Scoped_spin_lock;
} // namespace details
static struct _pplx_g_sched_t
{
typedef std::shared_ptr<pplx::scheduler_interface> sched_ptr;
_pplx_g_sched_t()
{
m_state = post_ctor;
}
~_pplx_g_sched_t()
{
m_state = post_dtor;
}
sched_ptr get_scheduler()
{
switch (m_state)
{
case post_ctor:
// This is the 99.9% case.
if (!m_scheduler)
{
::pplx::details::_Scoped_spin_lock lock(m_spinlock);
if (!m_scheduler)
{
m_scheduler = std::make_shared< ::pplx::default_scheduler_t>();
}
}
return m_scheduler;
default:
// This case means the global m_scheduler is not available.
// We spin off an individual scheduler instead.
return std::make_shared< ::pplx::default_scheduler_t>();
}
}
void set_scheduler(sched_ptr scheduler)
{
if (m_state == pre_ctor || m_state == post_dtor) {
throw invalid_operation("Scheduler cannot be initialized now");
}
::pplx::details::_Scoped_spin_lock lock(m_spinlock);
if (m_scheduler != nullptr)
{
throw invalid_operation("Scheduler is already initialized");
}
m_scheduler = std::move(scheduler);
}
enum
{
pre_ctor = 0,
post_ctor = 1,
post_dtor = 2
} m_state;
private:
pplx::details::_Spin_lock m_spinlock;
sched_ptr m_scheduler;
} _pplx_g_sched;
_PPLXIMP std::shared_ptr<pplx::scheduler_interface> _pplx_cdecl get_ambient_scheduler()
{
return _pplx_g_sched.get_scheduler();
}
_PPLXIMP void _pplx_cdecl set_ambient_scheduler(std::shared_ptr<pplx::scheduler_interface> _Scheduler)
{
_pplx_g_sched.set_scheduler(std::move(_Scheduler));
}
} // namespace pplx
#endif