Make CDistributedActorsMailbox compatible with C++ interop (#1214)

Author: egorzhdan

Sources/CDistributedActorsMailbox/include/backtrace_support.h

@@ -15,6 +15,10 @@
 #ifndef SACT_BACKTRACE_SUPPORT_H
 #define SACT_BACKTRACE_SUPPORT_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * Prints a stack backtrace directly to `stderr`.
  * Use only internally, mostly for 
@@ -26,4 +30,8 @@ void sact_dump_backtrace(void);
 
 int sact_get_backtrace(char*** strs);
 
+#if defined(__cplusplus)
+} // extern "C"
+#endif
+
 #endif

Sources/CDistributedActorsMailbox/include/c_mpsc_linked_queue.h

@@ -18,6 +18,10 @@
 #include <stdatomic.h>
 #include <stdlib.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 typedef struct Node {
  void* item;
  _Atomic (struct Node*) next;
@@ -39,4 +43,8 @@ void c_sact_mpsc_linked_queue_enqueue(CSActMPSCLinkedQueue* q, void* item);
 
 void* c_sact_mpsc_linked_queue_dequeue(CSActMPSCLinkedQueue* q);
 
+#if defined(__cplusplus)
+} // extern "C"
+#endif
+
 #endif /* CMPSCLinkedQueue_h */