basic: add _cleanup_ wrappers for pthread_mutex_{lock,unlock}

I put the helper functions in a separate header file, because they don't fit
anywhere else. pthread_mutex_{lock,unlock} is used in two places: nss-systemd
and hashmap. I don't indent to convert hashmap to use the helpers, because
there it'd make the code more complicated. Is it worth to create a new header
file even if the only use is in nss-systemd.c? I think yes, because it feels
clean and also I think it's likely that pthread_mutex_{lock,unlock} will be
used in other places later.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/basic/pthread-util.h b/src/basic/pthread-util.h
new file mode 100644
index 0000000000..dc3eaba436
--- /dev/null
+++ b/src/basic/pthread-util.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+#include <pthread.h>
+
+#include "macro.h"
+
+static inline pthread_mutex_t* pthread_mutex_lock_assert(pthread_mutex_t *mutex) {
+        assert_se(pthread_mutex_lock(mutex) == 0);
+        return mutex;
+}
+
+static inline void pthread_mutex_unlock_assertp(pthread_mutex_t **mutexp) {
+        if (*mutexp)
+                assert_se(pthread_mutex_unlock(*mutexp) == 0);
+}