55 lines
1.3 KiB
C++
55 lines
1.3 KiB
C++
#pragma once
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#include <mbgl/util/optional.hpp>
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#include <functional>
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#include <memory>
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#include <mutex>
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#include <queue>
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#include <mapbox/std/weak.hpp>
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namespace mbgl {
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class Scheduler;
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class Message;
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class Mailbox : public std::enable_shared_from_this<Mailbox> {
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public:
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// Create a "holding" mailbox, messages to which will remain queued,
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// unconsumed, until the mailbox is associated with a Scheduler using
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// start(). This allows a Mailbox object to be created on one thread and
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// later transferred to a different target thread that may not yet exist.
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Mailbox();
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Mailbox(Scheduler&);
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// Attach the given scheduler to this mailbox and begin processing messages
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// sent to it. The mailbox must be a "holding" mailbox, as created by the
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// default constructor Mailbox().
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void open(Scheduler& scheduler_);
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void close();
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bool isOpen() const;
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void push(std::unique_ptr<Message>);
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void receive();
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static void maybeReceive(const std::weak_ptr<Mailbox>&);
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static std::function<void()> makeClosure(std::weak_ptr<Mailbox>);
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private:
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mapbox::base::WeakPtr<Scheduler> weakScheduler;
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std::recursive_mutex receivingMutex;
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std::mutex pushingMutex;
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bool closed { false };
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std::mutex queueMutex;
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std::queue<std::unique_ptr<Message>> queue;
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};
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} // namespace mbgl
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