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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "threading/Mutex.h"
#include "js/Utility.h"
using namespace js;
#ifdef DEBUG
MOZ_THREAD_LOCAL(js::Mutex::MutexVector*) js::Mutex::HeldMutexStack;
/* static */ bool
js::Mutex::Init()
{
return HeldMutexStack.init();
}
/* static */ void
js::Mutex::ShutDown()
{
js_delete(HeldMutexStack.get());
HeldMutexStack.set(nullptr);
}
/* static */ js::Mutex::MutexVector&
js::Mutex::heldMutexStack()
{
auto stack = HeldMutexStack.get();
if (!stack) {
AutoEnterOOMUnsafeRegion oomUnsafe;
stack = js_new<MutexVector>();
if (!stack)
oomUnsafe.crash("js::Mutex::heldMutexStack");
HeldMutexStack.set(stack);
}
return *stack;
}
void
js::Mutex::lock()
{
auto& stack = heldMutexStack();
if (!stack.empty()) {
const Mutex& prev = *stack.back();
if (id_.order <= prev.id_.order) {
fprintf(stderr,
"Attempt to acquire mutex %s with order %d while holding %s with order %d\n",
id_.name, id_.order, prev.id_.name, prev.id_.order);
MOZ_CRASH("Mutex ordering violation");
}
}
MutexImpl::lock();
AutoEnterOOMUnsafeRegion oomUnsafe;
if (!stack.append(this))
oomUnsafe.crash("js::Mutex::lock");
}
void
js::Mutex::unlock()
{
auto& stack = heldMutexStack();
MOZ_ASSERT(stack.back() == this);
MutexImpl::unlock();
stack.popBack();
}
#endif
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