Move c_src dirs back to toplevel

We just wanted c sourcefiles out of the top level, not c source
directories.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 18 insertions, 0 deletions

diff --git a/include/linux/mutex.h b/include/linux/mutex.h
new file mode 100644
index 00000000..801f06e1
--- /dev/null
+++ b/include/linux/mutex.h
@@ -0,0 +1,18 @@
+#ifndef __TOOLS_LINUX_MUTEX_H
+#define __TOOLS_LINUX_MUTEX_H
+
+#include <pthread.h>
+
+struct mutex {
+	pthread_mutex_t lock;
+};
+
+#define DEFINE_MUTEX(mutexname) \
+	struct mutex mutexname = { .lock = PTHREAD_MUTEX_INITIALIZER }
+
+#define mutex_init(l)		pthread_mutex_init(&(l)->lock, NULL)
+#define mutex_lock(l)		pthread_mutex_lock(&(l)->lock)
+#define mutex_trylock(l)	(!pthread_mutex_trylock(&(l)->lock))
+#define mutex_unlock(l)		pthread_mutex_unlock(&(l)->lock)
+
+#endif /* __TOOLS_LINUX_MUTEX_H */