gecko-dev/mozglue/misc/Mutex_windows.cpp
Eric Rahm 480a72812d Bug 1371435 - Backed out changeset 5b6d169feb92. r=froydnj
CRITICAL_SECTIONs have useful debug info that we'd like to keep around at least
on nightly, rather than having diverging signatures on crash stats we'd like to
just keep a unified implementation. As we didn't see significant perf
improvements after landing we're going to just back this out.
2017-06-28 13:56:57 -07:00

58 lines
1.6 KiB
C++

/* -*- 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 "mozilla/DebugOnly.h"
#include "mozilla/PlatformMutex.h"
#include <windows.h>
#include "MutexPlatformData_windows.h"
mozilla::detail::MutexImpl::MutexImpl()
{
// This number was adopted from NSPR.
const static DWORD LockSpinCount = 1500;
#if defined(RELEASE_OR_BETA)
// Vista and later automatically allocate and subsequently leak a debug info
// object for each critical section that we allocate unless we tell the
// system not to do that.
DWORD flags = CRITICAL_SECTION_NO_DEBUG_INFO;
#else
DWORD flags = 0;
#endif // defined(RELEASE_OR_BETA)
BOOL r = InitializeCriticalSectionEx(&platformData()->criticalSection,
LockSpinCount, flags);
MOZ_RELEASE_ASSERT(r);
}
mozilla::detail::MutexImpl::~MutexImpl()
{
DeleteCriticalSection(&platformData()->criticalSection);
}
void
mozilla::detail::MutexImpl::lock()
{
EnterCriticalSection(&platformData()->criticalSection);
}
void
mozilla::detail::MutexImpl::unlock()
{
LeaveCriticalSection(&platformData()->criticalSection);
}
mozilla::detail::MutexImpl::PlatformData*
mozilla::detail::MutexImpl::platformData()
{
static_assert(sizeof(platformData_) >= sizeof(PlatformData),
"platformData_ is too small");
return reinterpret_cast<PlatformData*>(platformData_);
}