1 files changed, 13 insertions, 0 deletions
diff --git a/src/context.h b/src/context.h
index d65bf9b5..076d0731 100644
--- a/src/context.h
+++ b/src/context.h
@@ -21,6 +21,8 @@
 #ifndef CONTEXT_H
 #define CONTEXT_H
 
+#include <stdint.h>
+
 #include "gpgme.h"
 #include "engine.h"
 #include "wait.h"
@@ -78,6 +80,12 @@ struct gpgme_context
 {
   DECLARE_LOCK (lock);
 
+  /* The unique serial number of this context object.  This is used
+   * for a weak reference of the context.  Using the address of the
+   * context is not always possible becuase it might have already been
+   * freed and reused.  */
+  uint64_t serial;
+
   /* True if the context was canceled asynchronously.  */
   int canceled;
 
@@ -186,4 +194,9 @@ struct gpgme_context
   struct gpgme_io_cbs io_cbs;
 };
 
+
+/* Macro to retrieve the serial number.  Returns 0 if CTX is NULL.  */
+#define CTXSERIAL(ctx) (ctx? (unsigned long)ctx->serial : 0)
+
+
 #endif	/* CONTEXT_H */