Revert "LivoxGen1: Use syncCancelerForAsyncWork in producer pipeline"

This reverts commit d788810a05.

We're doing this because it's not necessary. We will be porting to
coros soon and we can just use brace-scopes.

include/user/stimulusProducer.h

@@ -14,7 +14,6 @@
 #include <boost/asio/io_service.hpp>
 #include <boost/asio/deadline_timer.hpp>
 #include <spinscale/spinLock.h>
-#include <spinscale/syncCancelerForAsyncWork.h>
 #include "deviceAttachmentSpec.h"
 
 namespace smo {
@@ -41,7 +40,8 @@ public:
 			&deviceAttachmentSpec,
 		boost::asio::io_service& ioService_)
 	: deviceAttachmentSpec(deviceAttachmentSpec),
-	ioService(ioService_), timer(ioService),
+	ioService(ioService_),
+	shouldContinue(false), timer(ioService),
 	nDeferrals(0)
 	{}
 
@@ -59,7 +59,7 @@ public:
 		std::cout << __func__ << ": Starting stimulus producer for device "
 			<< deviceAttachmentSpec->deviceSelector << std::endl;
 
-		stimulusProducerCanceler.startAcceptingWork();
+		shouldContinue = true;
 		nDeferrals = 0;
 		scheduleNextTimeout();
 	}
@@ -109,7 +109,8 @@ public:
 private:
 	boost::asio::io_service& ioService;
 protected:
-	sscl::SyncCancelerForAsyncWork stimulusProducerCanceler;
+	sscl::SpinLock shouldContinueLock;
+	bool shouldContinue;
 private:
 	boost::asio::deadline_timer timer;
 	size_t nDeferrals;