eventdev: add missing C++ guards

Some public header files were missing 'extern "C"' C++ guards,
and couldn't be used by C++ applications. Add the missing guards.

Fixes: dc39e2f359b5 ("eventdev: add ring structure for events")
Fixes: 7a3357205755 ("lib: remove C++ include guard from private headers")
Cc: stable@dpdk.org

Signed-off-by: Brian Dooley <brian.dooley@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Tyler Retzlaff <roretzla@linux.microsoft.com>

lib/eventdev/eventdev_pmd.h

@@ -5,6 +5,10 @@
 #ifndef _RTE_EVENTDEV_PMD_H_
 #define _RTE_EVENTDEV_PMD_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /** @file
  * RTE Event PMD APIs
  *
@@ -1366,4 +1370,8 @@ void
 event_dev_fp_ops_set(struct rte_event_fp_ops *fp_ops,
 		     const struct rte_eventdev *dev);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _RTE_EVENTDEV_PMD_H_ */

lib/eventdev/eventdev_pmd_pci.h

@@ -5,6 +5,10 @@
 #ifndef _RTE_EVENTDEV_PMD_PCI_H_
 #define _RTE_EVENTDEV_PMD_PCI_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /** @file
  * RTE Eventdev PCI PMD APIs
  *
@@ -150,4 +154,8 @@ rte_event_pmd_pci_remove(struct rte_pci_device *pci_dev,
 	return 0;
 }
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _RTE_EVENTDEV_PMD_PCI_H_ */

lib/eventdev/eventdev_pmd_vdev.h

@@ -5,6 +5,10 @@
 #ifndef _RTE_EVENTDEV_PMD_VDEV_H_
 #define _RTE_EVENTDEV_PMD_VDEV_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /** @file
  * RTE Eventdev VDEV PMD APIs
  *
@@ -99,4 +103,8 @@ rte_event_pmd_vdev_uninit(const char *name)
 	return 0;
 }
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _RTE_EVENTDEV_PMD_VDEV_H_ */

lib/eventdev/rte_event_ring.h

@@ -14,6 +14,10 @@
 #ifndef _RTE_EVENT_RING_
 #define _RTE_EVENT_RING_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include <stdint.h>
 
 #include <rte_common.h>
@@ -264,4 +268,9 @@ rte_event_ring_get_capacity(const struct rte_event_ring *r)
 {
 	return rte_ring_get_capacity(&r->r);
 }
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif