[LIBDCE] Mutual exclusion of Engine_open and Engine_close

This patch uses semaphores to mutually exclude:
1. dce_init() and Engine_open() IPU call.
   This solves a hang on IPU side during multiple
   instances.
   pthread mutex used within dce_init is replaced with
   semaphores as mutex is valid only across
   threads and not processes.
2. dce_deinit() and Engine_close().
   This solves a hang on IPU side during multiple
   instances.

Change-Id: Ia4d31582ebf0536142dee389e9601eae0169fb22
Signed-off-by: Saurabh Bipin Chandra <a0131926@ti.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/libdce.h b/libdce.h
index 5d4ffa8..b008e28 100644
--- a/libdce.h
+++ b/libdce.h
@@ -54,7 +54,8 @@ typedef enum dce_error_status {
     DCE_EIPC_CREATE_FAIL = -4,
     DCE_EIPC_CALL_FAIL = -5,
     DCE_EINVALID_INPUT = -6,
-    DCE_EOMAPDRM_FAIL = -7
+    DCE_EOMAPDRM_FAIL = -7,
+    DCE_ESEMAPHORE_FAIL = -8
 } dce_error_status;