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diff --git a/public/gcsdk/gcparalleljobfarm.h b/public/gcsdk/gcparalleljobfarm.h
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+++ b/public/gcsdk/gcparalleljobfarm.h
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+//====== Copyright (c), Valve Corporation, All rights reserved. =======
+//
+// Purpose: Implements singleton datacache with support for yielding updates
+//
+//=============================================================================
+
+#ifndef GCPARALLELJOBFARM_H
+#define GCPARALLELJOBFARM_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+namespace GCSDK
+{
+
+class IYieldingParallelFarmJobHandler
+{
+	//
+	// Derived class instances implementing farm job workload processing must
+	// be allocated on the heap as the calling job will yield for processing.
+	//
+protected:
+	//
+	// BYieldingRunWorkload is called on different newly created farm jobs
+	// Param passed iJobSequenceCounter starts at 0 (zero) for the first framed job
+	// and is incremented by one for each subsequently farmed job.
+	// When the parallel processing should end job must set pbWorkloadCompleted to true
+	// and return true as success.
+	// Any farmed job returning false will abort further farmed processing and
+	// will result in BYieldingExecuteParallel returning false to the caller job.
+	//
+	virtual bool BYieldingRunWorkload( int iJobSequenceCounter, bool *pbWorkloadCompleted ) = 0;
+
+public:
+	bool BYieldingExecuteParallel( int numJobsParallel, char const *pchJobName = NULL, uint nTimeoutSec = 0 );
+};
+
+
+} // namespace GCSDK
+
+#endif // GCPARALLELJOBFARM_H