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-rw-r--r--src/vlibmemory/api.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/src/vlibmemory/api.h b/src/vlibmemory/api.h
index 6cd645bb1d5..662805373ba 100644
--- a/src/vlibmemory/api.h
+++ b/src/vlibmemory/api.h
@@ -53,6 +53,28 @@ vl_api_can_send_msg (vl_api_registration_t * rp)
return vl_mem_api_can_send (rp->vl_input_queue);
}
+/*
+ * Suggests to an API handler to relinguish control. Currently limits
+ * an handler to a maximum of 1ms or it earlier if the client queue is
+ * full.
+ *
+ * May be enhanced in the future based on other performance
+ * characteristics of the main thread.
+ */
+#define VL_API_MAX_TIME_IN_HANDLER 0.001 /* 1 ms */
+always_inline int
+vl_api_process_may_suspend (vlib_main_t * vm, vl_api_registration_t * rp,
+ f64 start)
+{
+ /* Is client queue full (leave space for reply message) */
+ if (rp->registration_type <= REGISTRATION_TYPE_SHMEM &&
+ rp->vl_input_queue->cursize + 1 >= rp->vl_input_queue->maxsize)
+ return true;
+ if (vlib_time_now (vm) > start + VL_API_MAX_TIME_IN_HANDLER)
+ return true;
+ return false;
+}
+
always_inline vl_api_registration_t *
vl_api_client_index_to_registration (u32 index)
{