In threaded processes, destroy the mutex atexit_mutex when we've

finished using it.  This allows the mutex's allocated memory to be
freed.

This is one sense a rather silly change, since at this point we're
less than a microsecond away from calling _exit; but fixing this
memory leak is likely to make life easier for anyone trying to
track down other memory leaks.

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/libc/stdlib/atexit.c b/lib/libc/stdlib/atexit.c
index efd1264..aba3edd 100644
--- a/lib/libc/stdlib/atexit.c
+++ b/lib/libc/stdlib/atexit.c
@@ -54,6 +54,7 @@ static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER;
 
 #define _MUTEX_LOCK(x)		if (__isthreaded) _pthread_mutex_lock(x)
 #define _MUTEX_UNLOCK(x)	if (__isthreaded) _pthread_mutex_unlock(x)
+#define _MUTEX_DESTROY(x)	if (__isthreaded) _pthread_mutex_destroy(x)
 
 struct atexit {
 	struct atexit *next;			/* next in list */
@@ -182,4 +183,6 @@ __cxa_finalize(void *dso)
 		}
 	}
 	_MUTEX_UNLOCK(&atexit_mutex);
+	if (dso == NULL)
+		_MUTEX_DESTROY(&atexit_mutex);
 }