[LTP] [PATCH 2/3] tst_test: add macro helper to invoke pthread_once()

Alexey Kodanev
2016-12-19T13:36:34Z

Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
---
include/tst_test.h | 14 ++++++++++++++
1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/include/tst_test.h b/include/tst_test.h
index 3c77a98..a4ba167 100644
--- a/include/tst_test.h
+++ b/include/tst_test.h
@@ -71,6 +71,20 @@ pid_t safe_fork(const char *filename, unsigned int lineno);
({int ret = expr; \
ret != 0 ? tst_res(TINFO, #expr " failed"), ret : ret; }) \

+/*
+ * Macro to use for making functions called only once in
+ * multi-threaded tests such as init or cleanup function.
+ * The first call to @name_fn function by any thread shall
+ * call the @exec_fn. Subsequent calls shall not call @exec_fn.
+ * *_fn functions must not take any arguments.
+ */
+#define TST_DECLARE_ONCE_FN(name_fn, exec_fn) \
+ void name_fn(void) \
+ { \
+ static pthread_once_t ltp_once = PTHREAD_ONCE_INIT; \
+ pthread_once(&ltp_once, exec_fn); \
+ }
+
#include "tst_safe_macros.h"
#include "tst_safe_file_ops.h"
#include "tst_safe_net.h"
--
1.7.1