deps: upgrade to libuv 1.21.0

Notable changes:

- Building via cmake is now supported.
  PR-URL: https://github.com/libuv/libuv/pull/1850
- Stricter checks have been added to prevent watching the same
  file descriptor multiple times.
  PR-URL: https://github.com/libuv/libuv/pull/1851
  Refs: https://github.com/nodejs/node/issues/3604
- An IPC deadlock on Windows has been fixed.
  PR-URL: https://github.com/libuv/libuv/pull/1843
  Fixes: https://github.com/nodejs/node/issues/9706
  Fixes: https://github.com/nodejs/node/issues/7657
- uv_fs_lchown() has been added.
  PR-URL: https://github.com/libuv/libuv/pull/1826
  Refs: https://github.com/nodejs/node/issues/19868
- uv_fs_copyfile() sets errno on error.
  PR-URL: https://github.com/libuv/libuv/pull/1881
  Fixes: https://github.com/nodejs/node/issues/21329
- uv_fs_fchmod() supports -A files on Windows.
  PR-URL: https://github.com/libuv/libuv/pull/1819
  Refs: https://github.com/nodejs/node/issues/12803

PR-URL: https://github.com/nodejs/node/pull/21466
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 24 insertions, 15 deletions

diff --git a/deps/uv/src/unix/signal.c b/deps/uv/src/unix/signal.c
index b9d0a56084..8da08b8680 100644
--- a/deps/uv/src/unix/signal.c
+++ b/deps/uv/src/unix/signal.c
@@ -54,8 +54,7 @@ static void uv__signal_unregister_handler(int signum);
 static uv_once_t uv__signal_global_init_guard = UV_ONCE_INIT;
 static struct uv__signal_tree_s uv__signal_tree =
     RB_INITIALIZER(uv__signal_tree);
-static int uv__signal_lock_pipefd[2];
-
+static int uv__signal_lock_pipefd[2] = { -1, -1 };
 
 RB_GENERATE_STATIC(uv__signal_tree_s,
                    uv_signal_s, tree_entry,
@@ -64,7 +63,7 @@ RB_GENERATE_STATIC(uv__signal_tree_s,
 static void uv__signal_global_reinit(void);
 
 static void uv__signal_global_init(void) {
-  if (!uv__signal_lock_pipefd[0])
+  if (uv__signal_lock_pipefd[0] == -1)
     /* pthread_atfork can register before and after handlers, one
      * for each child. This only registers one for the child. That
      * state is both persistent and cumulative, so if we keep doing
@@ -74,15 +73,11 @@ static void uv__signal_global_init(void) {
     if (pthread_atfork(NULL, NULL, &uv__signal_global_reinit))
       abort();
 
-  if (uv__make_pipe(uv__signal_lock_pipefd, 0))
-    abort();
-
-  if (uv__signal_unlock())
-    abort();
+  uv__signal_global_reinit();
 }
 
 
-static void uv__signal_global_reinit(void) {
+UV_DESTRUCTOR(static void uv__signal_global_fini(void)) {
   /* We can only use signal-safe functions here.
    * That includes read/write and close, fortunately.
    * We do all of this directly here instead of resetting
@@ -90,11 +85,26 @@ static void uv__signal_global_reinit(void) {
    * uv__signal_global_once_init is only called from uv_loop_init
    * and this needs to function in existing loops.
    */
-  uv__close(uv__signal_lock_pipefd[0]);
-  uv__signal_lock_pipefd[0] = -1;
-  uv__close(uv__signal_lock_pipefd[1]);
-  uv__signal_lock_pipefd[1] = -1;
-  uv__signal_global_init();
+  if (uv__signal_lock_pipefd[0] != -1) {
+    uv__close(uv__signal_lock_pipefd[0]);
+    uv__signal_lock_pipefd[0] = -1;
+  }
+
+  if (uv__signal_lock_pipefd[1] != -1) {
+    uv__close(uv__signal_lock_pipefd[1]);
+    uv__signal_lock_pipefd[1] = -1;
+  }
+}
+
+
+static void uv__signal_global_reinit(void) {
+  uv__signal_global_fini();
+
+  if (uv__make_pipe(uv__signal_lock_pipefd, 0))
+    abort();
+
+  if (uv__signal_unlock())
+    abort();
 }
 
 
@@ -103,7 +113,6 @@ void uv__signal_global_once_init(void) {
 }
 
 
-
 static int uv__signal_lock(void) {
   int r;
   char data;