svm: add producer wait function

Type: refactor

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: I9488ad7e045c908b60b5821d9c48583f6d513c2f

1 files changed, 10 insertions, 2 deletions

diff --git a/src/svm/message_queue.h b/src/svm/message_queue.h
index 1ef773d9f0a..0e402c5a409 100644
--- a/src/svm/message_queue.h
+++ b/src/svm/message_queue.h
@@ -399,12 +399,20 @@ svm_msg_q_unlock (svm_msg_q_t * mq)
 /**
  * Wait for message queue event
  *
- * Must be called with mutex held. The queue only works non-blocking
- * with eventfds, so handle blocking calls as an exception here.
+ * When eventfds are not configured, the shared memory mutex is locked
+ * before waiting on the condvar. Typically called by consumers.
  */
 int svm_msg_q_wait (svm_msg_q_t *mq, svm_msg_q_wait_type_t type);
 
 /**
+ * Wait for message queue event as producer
+ *
+ * Similar to @ref svm_msg_q_wait but lock (mutex or spinlock) must
+ * be held. Should only be called by producers.
+ */
+int svm_msg_q_wait_prod (svm_msg_q_t *mq);
+
+/**
  * Timed wait for message queue event
  *
  * Must be called with mutex held.