f71e8fd0c5
Reason for revert: linux x86-64 release segfault in src/ports/SkFontHost_fontconfig.cpp:107 http://108.170.220.120:10117/builders/Test-Ubuntu12-ShuttleA-GTX660-x86_64-Release/builds/905/steps/RunTests/logs/stdio Original issue's description: > Port most uses of SkOnce to SkLazyPtr. > > BUG=skia: > > Committed: http://code.google.com/p/skia/source/detail?r=15006 > > Committed: http://code.google.com/p/skia/source/detail?r=15014 R=reed@google.com, mtklein@chromium.org TBR=mtklein@chromium.org, reed@google.com NOTREECHECKS=true NOTRY=true BUG=skia: Author: mtklein@google.com Review URL: https://codereview.chromium.org/306063004 git-svn-id: http://skia.googlecode.com/svn/trunk@15015 2bbb7eff-a529-9590-31e7-b0007b416f81
117 lines
3.5 KiB
C++
117 lines
3.5 KiB
C++
/*
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* Copyright 2013 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkMessageBus_DEFINED
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#define SkMessageBus_DEFINED
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#include "SkOnce.h"
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#include "SkTDArray.h"
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#include "SkThread.h"
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#include "SkTypes.h"
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template <typename Message>
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class SkMessageBus : SkNoncopyable {
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public:
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// Post a message to be received by all Inboxes for this Message type. Threadsafe.
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static void Post(const Message& m);
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class Inbox {
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public:
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Inbox();
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~Inbox();
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// Overwrite out with all the messages we've received since the last call. Threadsafe.
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void poll(SkTDArray<Message>* out);
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private:
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SkTDArray<Message> fMessages;
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SkMutex fMessagesMutex;
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friend class SkMessageBus;
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void receive(const Message& m); // SkMessageBus is a friend only to call this.
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};
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private:
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SkMessageBus();
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static SkMessageBus* Get();
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static void New(SkMessageBus**);
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SkTDArray<Inbox*> fInboxes;
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SkMutex fInboxesMutex;
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};
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// This must go in a single .cpp file, not some .h, or we risk creating more than one global
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// SkMessageBus per type when using shared libraries.
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#define DECLARE_SKMESSAGEBUS_MESSAGE(Message) \
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template <> \
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SkMessageBus<Message>* SkMessageBus<Message>::Get() { \
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static SkMessageBus<Message>* bus = NULL; \
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SK_DECLARE_STATIC_ONCE(once); \
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SkOnce(&once, &New, &bus); \
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SkASSERT(bus != NULL); \
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return bus; \
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}
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// ----------------------- Implementation of SkMessageBus::Inbox -----------------------
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template<typename Message>
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SkMessageBus<Message>::Inbox::Inbox() {
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// Register ourselves with the corresponding message bus.
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SkMessageBus<Message>* bus = SkMessageBus<Message>::Get();
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SkAutoMutexAcquire lock(bus->fInboxesMutex);
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bus->fInboxes.push(this);
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}
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template<typename Message>
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SkMessageBus<Message>::Inbox::~Inbox() {
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// Remove ourselves from the corresponding message bus.
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SkMessageBus<Message>* bus = SkMessageBus<Message>::Get();
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SkAutoMutexAcquire lock(bus->fInboxesMutex);
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// This is a cheaper fInboxes.remove(fInboxes.find(this)) when order doesn't matter.
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for (int i = 0; i < bus->fInboxes.count(); i++) {
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if (this == bus->fInboxes[i]) {
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bus->fInboxes.removeShuffle(i);
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break;
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}
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}
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}
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template<typename Message>
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void SkMessageBus<Message>::Inbox::receive(const Message& m) {
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SkAutoMutexAcquire lock(fMessagesMutex);
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fMessages.push(m);
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}
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template<typename Message>
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void SkMessageBus<Message>::Inbox::poll(SkTDArray<Message>* messages) {
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SkASSERT(NULL != messages);
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messages->reset();
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SkAutoMutexAcquire lock(fMessagesMutex);
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messages->swap(fMessages);
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}
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// ----------------------- Implementation of SkMessageBus -----------------------
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template <typename Message>
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SkMessageBus<Message>::SkMessageBus() {}
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template <typename Message>
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/*static*/ void SkMessageBus<Message>::New(SkMessageBus<Message>** bus) {
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*bus = new SkMessageBus<Message>();
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}
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template <typename Message>
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/*static*/ void SkMessageBus<Message>::Post(const Message& m) {
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SkMessageBus<Message>* bus = SkMessageBus<Message>::Get();
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SkAutoMutexAcquire lock(bus->fInboxesMutex);
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for (int i = 0; i < bus->fInboxes.count(); i++) {
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bus->fInboxes[i]->receive(m);
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}
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}
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#endif // SkMessageBus_DEFINED
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