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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/Assertions.h"
#include <float.h>
#include <intrin.h>
#include <stdlib.h>
#include <windows.h>
#include "threading/ConditionVariable.h"
#include "threading/Mutex.h"
#include "threading/windows/MutexPlatformData.h"
// Some versions of the Windows SDK have a bug where some interlocked functions
// are not redefined as compiler intrinsics. Fix that for the interlocked
// functions that are used in this file.
#if defined(_MSC_VER) && !defined(InterlockedExchangeAdd)
#define InterlockedExchangeAdd(addend, value) \
_InterlockedExchangeAdd((volatile long*)(addend), (long)(value))
#endif
#if defined(_MSC_VER) && !defined(InterlockedIncrement)
#define InterlockedIncrement(addend) \
_InterlockedIncrement((volatile long*)(addend))
#endif
// Wrapper for native condition variable APIs.
struct js::ConditionVariable::PlatformData
{
CONDITION_VARIABLE cv_;
};
js::ConditionVariable::ConditionVariable()
{
InitializeConditionVariable(&platformData()->cv_);
}
void
js::ConditionVariable::notify_one()
{
WakeConditionVariable(&platformData()->cv_);
}
void
js::ConditionVariable::notify_all()
{
WakeAllConditionVariable(&platformData()->cv_);
}
void
js::ConditionVariable::wait(UniqueLock<Mutex>& lock)
{
SRWLOCK* srwlock = &lock.lock.platformData()->lock;
bool r = SleepConditionVariableSRW(&platformData()->cv_, srwlock, INFINITE, 0);
MOZ_RELEASE_ASSERT(r);
}
js::CVStatus
js::ConditionVariable::wait_until(UniqueLock<Mutex>& lock,
const mozilla::TimeStamp& abs_time)
{
return wait_for(lock, abs_time - mozilla::TimeStamp::Now());
}
js::CVStatus
js::ConditionVariable::wait_for(UniqueLock<Mutex>& lock,
const mozilla::TimeDuration& rel_time)
{
SRWLOCK* srwlock = &lock.lock.platformData()->lock;
// Note that DWORD is unsigned, so we have to be careful to clamp at 0.
// If rel_time is Forever, then ToMilliseconds is +inf, which evaluates as
// greater than UINT32_MAX, resulting in the correct INFINITE wait.
double msecd = rel_time.ToMilliseconds();
DWORD msec = msecd < 0.0
? 0
: msecd > UINT32_MAX
? INFINITE
: static_cast<DWORD>(msecd);
BOOL r = SleepConditionVariableSRW(&platformData()->cv_, srwlock, msec, 0);
if (r)
return CVStatus::NoTimeout;
MOZ_RELEASE_ASSERT(GetLastError() == ERROR_TIMEOUT);
return CVStatus::Timeout;
}
js::ConditionVariable::~ConditionVariable()
{
// Native condition variables don't require cleanup.
}
inline js::ConditionVariable::PlatformData*
js::ConditionVariable::platformData()
{
static_assert(sizeof platformData_ >= sizeof(PlatformData),
"platformData_ is too small");
return reinterpret_cast<PlatformData*>(platformData_);
}
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