getcwd: fix compilation on mingw64

[gnulib.git] / lib / sockets.c

diff --git a/lib/sockets.c b/lib/sockets.c
index 42b8f9e..53cb66e 100644 (file)
--- a/lib/sockets.c
+++ b/lib/sockets.c
@@ -37,6 +37,10 @@ close_fd_maybe_socket (const struct fd_hook *remaining_list,
                        gl_close_fn primary,
                        int fd)
 {
+  /* Note about multithread-safety: There is a race condition where, between
+     our calls to closesocket() and the primary close(), some other thread
+     could make system calls that allocate precisely the same HANDLE value
+     as sock; then the primary close() would call CloseHandle() on it.  */
   SOCKET sock;
   WSANETWORKEVENTS ev;