CMake,config.h: Add -DSTIMBUFF_FRAME_RETRY_DELAY_MS

This determines how long a stimbuff should wait before retrying
to produce a stimframe, if the previous stimframe is still being
produced.

CMakeLists.txt

@@ -40,6 +40,14 @@ if(NOT STIMBUFF_FRAME_PERIOD_MS GREATER 0)
 		"STIMBUFF_FRAME_PERIOD_MS must be a positive integer > 0")
 endif()
 
+# Stimulus buffer frame retry delay configuration
+set(STIMBUFF_FRAME_RETRY_DELAY_MS 3
+	CACHE STRING "Stimulus buffer frame retry delay (ms)")
+if(NOT STIMBUFF_FRAME_RETRY_DELAY_MS GREATER 0)
+    message(FATAL_ERROR
+		"STIMBUFF_FRAME_RETRY_DELAY_MS must be a positive integer > 0")
+endif()
+
 # World thread configuration
 option(WORLD_USE_BODY_THREAD
 	"Use body thread for world component instead of separate world thread" OFF)
@@ -61,6 +69,8 @@ endif()
 set(CONFIG_DEBUG_QUTEX_DEADLOCK_TIMEOUT_MS ${DEBUG_QUTEX_DEADLOCK_TIMEOUT_MS})
 # Set the stimulus buffer frame period variable for config.h
 set(CONFIG_STIMBUFF_FRAME_PERIOD_MS ${STIMBUFF_FRAME_PERIOD_MS})
+# Set the stimulus buffer frame retry delay variable for config.h
+set(CONFIG_STIMBUFF_FRAME_RETRY_DELAY_MS ${STIMBUFF_FRAME_RETRY_DELAY_MS})
 
 # Configure config.h
 configure_file(