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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/RecursiveMutex.h"
#ifdef XP_WIN
# include <windows.h>
# define NativeHandle(m) (reinterpret_cast<CRITICAL_SECTION*>(&m))
#endif
namespace mozilla {
RecursiveMutex::RecursiveMutex(const char* aName)
: BlockingResourceBase(aName, eRecursiveMutex)
#ifdef DEBUG
,
mOwningThread(nullptr),
mEntryCount(0)
#endif
{
#ifdef XP_WIN
// This number was adapted from NSPR.
static const DWORD sLockSpinCount = 100;
# 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
BOOL r =
InitializeCriticalSectionEx(NativeHandle(mMutex), sLockSpinCount, flags);
MOZ_RELEASE_ASSERT(r);
#else
pthread_mutexattr_t attr;
MOZ_RELEASE_ASSERT(pthread_mutexattr_init(&attr) == 0,
"pthread_mutexattr_init failed");
MOZ_RELEASE_ASSERT(
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) == 0,
"pthread_mutexattr_settype failed");
MOZ_RELEASE_ASSERT(pthread_mutex_init(&mMutex, &attr) == 0,
"pthread_mutex_init failed");
MOZ_RELEASE_ASSERT(pthread_mutexattr_destroy(&attr) == 0,
"pthread_mutexattr_destroy failed");
#endif
}
RecursiveMutex::~RecursiveMutex() {
#ifdef XP_WIN
DeleteCriticalSection(NativeHandle(mMutex));
#else
MOZ_RELEASE_ASSERT(pthread_mutex_destroy(&mMutex) == 0,
"pthread_mutex_destroy failed");
#endif
}
void RecursiveMutex::LockInternal() {
#ifdef XP_WIN
EnterCriticalSection(NativeHandle(mMutex));
#else
MOZ_RELEASE_ASSERT(pthread_mutex_lock(&mMutex) == 0,
"pthread_mutex_lock failed");
#endif
}
void RecursiveMutex::UnlockInternal() {
#ifdef XP_WIN
LeaveCriticalSection(NativeHandle(mMutex));
#else
MOZ_RELEASE_ASSERT(pthread_mutex_unlock(&mMutex) == 0,
"pthread_mutex_unlock failed");
#endif
}
} // namespace mozilla
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