Enable prefetching backtace

Signed-off-by: Mattias Andrée <maandree@kth.se>

3 files changed, 13 insertions, 4 deletions

diff --git a/config.mk b/config.mk
index 51e1c93..df0ba5d 100644
--- a/config.mk
+++ b/config.mk
@@ -2,5 +2,5 @@ PREFIX    = /usr
 MANPREFIX = $(PREFIX)/share/man
 
 CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700
-CFLAGS   = -std=c99 -Wall -pedantic
+CFLAGS   = -std=c11 -Wall -pedantic
 LDFLAGS  = -s -lunwind -ldw -lerror
diff --git a/internal.h b/internal.h
index a2be394..1975522 100644
--- a/internal.h
+++ b/internal.h
@@ -21,5 +21,8 @@ struct liberror_backtrace {
 };
 
 
+extern _Thread_local struct liberror_backtrace *liberror_saved_backtrace;
+
+
 void liberror_print_backtrace(struct liberror_error *, FILE *, const char *);
 int liberror_save_backtrace(struct liberror_error *);
diff --git a/save_backtrace.c b/save_backtrace.c
index e366abf..7214fa4 100644
--- a/save_backtrace.c
+++ b/save_backtrace.c
@@ -53,9 +53,15 @@ liberror_save_backtrace(struct liberror_error *error)
 
 	ret = 0;
 out:
-	if (error->backtrace && !--error->backtrace->refcount)
-		free(error->backtrace);
-	error->backtrace = backtrace;
+	if (error) {
+		if (error->backtrace && !--error->backtrace->refcount)
+			free(error->backtrace);
+		error->backtrace = backtrace;
+	} else {
+		if (liberror_saved_backtrace && !--liberror_saved_backtrace->refcount)
+			free(liberror_saved_backtrace);
+		liberror_saved_backtrace = backtrace;
+	}
 	errno = saved_errno;
 	return ret;
 }