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63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
#ifndef ASYNCHRONOUS_BRIDGE_H
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#define ASYNCHRONOUS_BRIDGE_H
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#include <atomic>
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#include <boost/asio/io_context.hpp>
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#include <boost/asio/post.hpp>
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namespace sscl::cps {
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class AsynchronousBridge
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{
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public:
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AsynchronousBridge(boost::asio::io_context &io_context)
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: isAsyncOperationComplete(false), io_context(io_context)
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{}
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void setAsyncOperationComplete(void)
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{
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/** EXPLANATION:
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* This empty post()ed message is necessary to ensure that the thread
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* that's waiting on the io_context is signaled to wake up and check
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* the io_context's queue.
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*/
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isAsyncOperationComplete.store(true);
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boost::asio::post(io_context, []{});
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}
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/** Blocks the calling thread in run_one() on the bridge's io_context.
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* Used by syncAwaitAllSettlements(); that io_context must be the caller
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* thread's own queue so posted completions on the caller are not starved.
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*/
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void waitForAsyncOperationCompleteOrIoContextStopped(void)
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{
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for (;;)
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{
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io_context.run_one();
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if (isAsyncOperationComplete.load() || io_context.stopped())
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{ break; }
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/** EXPLANATION:
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* In the puppeteer and mind thread loops we call checkException()
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* after run() returns, but we don't have to do that here because
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* setException() calls stop().
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*
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* So if an exception is set on our thread, we'll break out of this
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* loop due to the check for stopped() above, and that'll take us
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* back out to the main loop, where we'll catch the exception.
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*/
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}
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}
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bool exitedBecauseIoContextStopped(void) const
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{ return io_context.stopped(); }
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private:
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std::atomic<bool> isAsyncOperationComplete;
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boost::asio::io_context &io_context;
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};
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} // namespace sscl::cps
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#endif // ASYNCHRONOUS_BRIDGE_H
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