397ad713cf
To be used also by Skia code to detect problems with Vulkan drivers. The watchdog does not handle OpenCL because neither did the original code, but also because OpenCLZone::hardDisable() called from it would deadlock on SolarMutex for some reason. Change-Id: I483d8cb0b11a4e1e65c564f4e4c29ab68843ff71 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/88008 Tested-by: Jenkins Reviewed-by: Luboš Luňák <l.lunak@collabora.com>
72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef INCLUDED_COMPHELPER_CRASHZONE_H
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#define INCLUDED_COMPHELPER_CRASHZONE_H
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#include <sal/config.h>
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#include <sal/types.h>
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#include <comphelper/comphelperdllapi.h>
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#include <atomic>
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#include <csignal>
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#include <type_traits>
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struct CrashWatchdogTimingsValues
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{
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/// delays to take various actions in 1/4 of a second increments.
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int mnDisableEntries;
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int const mnAbortAfter;
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};
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/**
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* A generic class for detecting if a given crash or a lock-up came from a specific
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* area of code (such as OpenGL).
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* Use this helper to track that.
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* The class is a template so that there can be multiple instances of static variables.
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*/
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template <typename Dummy> class CrashZone
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{
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// gnEnterCount and gnLeaveCount are accessed both from multiple threads (cf.
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// WatchdogThread::execute; so need to be of atomic type) and from signal handlers (cf.
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// VCLExceptionSignal_impl; so need to be of lock-free atomic type). sig_atomic_t is chosen as
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// the underlying type under the assumption that it is most likely to lead to an atomic type
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// that is actually lock-free. However, gnEnterCount and gnLeaveCount are both monotonically
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// increasing, so will eventually overflow, so the underlying type better be unsigned, which
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// sig_atomic_t is not guaranteed to be:
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#if !defined ARM32 || (defined ARM32 && defined __ARM_PCS_VFP)
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using AtomicCounter = std::atomic<std::make_unsigned_t<std::sig_atomic_t>>;
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static_assert(AtomicCounter::is_always_lock_free);
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#else
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using AtomicCounter = volatile std::make_unsigned_t<std::sig_atomic_t>;
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#endif
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/// how many times have we entered a zone
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static inline AtomicCounter gnEnterCount = 0;
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/// how many times have we left a new zone
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static inline AtomicCounter gnLeaveCount = 0;
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public:
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CrashZone() { enter(); }
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~CrashZone() { leave(); }
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static bool isInZone() { return gnEnterCount != gnLeaveCount; }
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static const AtomicCounter& enterCount() { return gnEnterCount; }
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// prefer creating instances to manually calling enter()/leave()
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static void enter() { gnEnterCount++; }
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static void leave() { gnLeaveCount++; }
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// these should be implemented for each specific zone if needed
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// static void hardDisable();
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// static const CrashWatchdogTimingsValues& getCrashWatchdogTimingsValues();
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// static void checkDebug(int nUnchanged, const CrashWatchdogTimingsValues& aTimingValues);
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// static const char* name();
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};
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#endif // INCLUDED_COMPHELPER_CRASHZONE_H
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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