replay: introduce mutex to protect the replay log

This mutex will protect read/write operations for replay log.
Using mutex is necessary because most of the events consist of
several fields stored in the log. The mutex will help to avoid races.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20150917162348.8676.8628.stgit@PASHA-ISP.def.inno>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/replay/replay-internal.h b/replay/replay-internal.h
index 17600deff9..8a0de0d8d8 100644
--- a/replay/replay-internal.h
+++ b/replay/replay-internal.h
@@ -33,6 +33,13 @@ int64_t replay_get_qword(void);
 void replay_get_array(uint8_t *buf, size_t *size);
 void replay_get_array_alloc(uint8_t **buf, size_t *size);
 
+/* Mutex functions for protecting replay log file */
+
+void replay_mutex_init(void);
+void replay_mutex_destroy(void);
+void replay_mutex_lock(void);
+void replay_mutex_unlock(void);
+
 /*! Checks error status of the file. */
 void replay_check_error(void);