VLCKit/libvlc/patches/0015-Work-around-lack-of-__thread-storage-qualifier-on-ol.patch

From 834faef414b913e0a909945295779509dff44d55 Mon Sep 17 00:00:00 2001
From: Carola Nitz <nitz.carola@googlemail.com>
Date: Fri, 23 Feb 2018 13:16:41 +0100
Subject: [PATCH 15/16] Work around lack of __thread storage qualifier on old
 macOS

---
 compat/tdestroy.c    | 67 ++++++++++++++++++++++++++------------------
 configure.ac         |  4 +--
 include/vlc_fixups.h |  6 ++--
 po/POTFILES.in       |  1 +
 src/Makefile.am      |  1 +
 5 files changed, 47 insertions(+), 32 deletions(-)

diff --git a/compat/tdestroy.c b/compat/tdestroy.c
index 6bb3480957..5c54881553 100644
--- a/compat/tdestroy.c
+++ b/compat/tdestroy.c
@@ -3,7 +3,7 @@
  * @brief replacement for GNU tdestroy()
  */
 /*****************************************************************************
- * Copyright (C) 2009, 2018 Rémi Denis-Courmont
+ * Copyright (C) 2009 Rémi Denis-Courmont
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as published by
@@ -24,77 +24,88 @@
 # include "config.h"
 #endif
 
-#include <assert.h>
+#if defined(HAVE_SEARCH_H) && !defined(HAVE_TDESTROY) && defined(HAVE_TFIND)
+
 #include <stdlib.h>
-#ifdef HAVE_SEARCH_H
-# include <search.h>
-#endif
+#include <assert.h>
 
-#ifdef HAVE_TFIND
-static __thread struct
+#include <vlc_common.h>
+#include <search.h>
+
+static struct
 {
     const void **tab;
     size_t count;
-} list = { NULL, 0 };
+    vlc_mutex_t lock;
+} list = { NULL, 0, VLC_STATIC_MUTEX };
 
-static void list_nodes(const void *node, const VISIT which, const int depth)
+static void list_nodes (const void *node, const VISIT which, const int depth)
 {
     (void) depth;
 
     if (which != postorder && which != leaf)
         return;
 
-    const void **tab = realloc(list.tab, sizeof (*tab) * (list.count + 1));
-    if (tab == NULL)
-        abort();
+    const void **tab = realloc (list.tab, sizeof (*tab) * (list.count + 1));
+    if (unlikely(tab == NULL))
+        abort ();
 
     tab[list.count] = *(const void **)node;
     list.tab = tab;
     list.count++;
 }
 
-static __thread const void *smallest;
+static struct
+{
+    const void *node;
+    vlc_mutex_t lock;
+} smallest = { NULL, VLC_STATIC_MUTEX };
 
-static int cmp_smallest(const void *a, const void *b)
+static int cmp_smallest (const void *a, const void *b)
 {
     if (a == b)
         return 0;
-    if (a == smallest)
+    if (a == smallest.node)
         return -1;
-    if (b == smallest)
+    if (likely(b == smallest.node))
         return +1;
-    abort();
+    abort ();
 }
 
-void tdestroy(void *root, void (*freenode)(void *))
+void vlc_tdestroy (void *root, void (*freenode) (void *))
 {
     const void **tab;
     size_t count;
 
-    assert(freenode != NULL);
+    assert (freenode != NULL);
 
     /* Enumerate nodes in order */
-    assert(list.count == 0);
-    twalk(root, list_nodes);
+    vlc_mutex_lock (&list.lock);
+    assert (list.count == 0);
+    twalk (root, list_nodes);
     tab = list.tab;
     count = list.count;
     list.tab = NULL;
     list.count = 0;
+    vlc_mutex_unlock (&list.lock);
 
     /* Destroy the tree */
+    vlc_mutex_lock (&smallest.lock);
     for (size_t i = 0; i < count; i++)
     {
-         void *node = (void *)(tab[i]);
+         void *node  = tab[i];
 
-         smallest = node;
-         node = tdelete(node, &root, cmp_smallest);
-         assert(node != NULL);
+         smallest.node = node;
+         node = tdelete (node, &root, cmp_smallest);
+         assert (node != NULL);
     }
+    vlc_mutex_unlock (&smallest.lock);
     assert (root == NULL);
 
     /* Destroy the nodes */
     for (size_t i = 0; i < count; i++)
-         freenode((void *)(tab[i]));
-    free(tab);
+         freenode ((void *)(tab[i]));
+    free (tab);
 }
-#endif /* HAVE_TFIND */
+
+#endif
diff --git a/configure.ac b/configure.ac
index 1201826d2f..3ad0ccf81d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -639,8 +639,8 @@ dnl Check for system libs needed
 need_libc=false
 
 dnl Check for usual libc functions
-AC_CHECK_FUNCS([accept4 daemon fcntl flock fstatat fstatvfs fork getmntent_r getenv getpwuid_r isatty memalign mkostemp mmap open_memstream newlocale pipe2 pread posix_fadvise posix_madvise setlocale stricmp strnicmp strptime uselocale])
-AC_REPLACE_FUNCS([aligned_alloc atof atoll dirfd fdopendir flockfile fsync getdelim getpid lfind lldiv memrchr nrand48 poll posix_memalign recvmsg rewind sendmsg setenv strcasecmp strcasestr strdup strlcpy strndup strnlen strnstr strsep strtof strtok_r strtoll swab tdestroy tfind timegm timespec_get strverscmp pathconf])
+AC_CHECK_FUNCS([accept4 daemon fcntl flock fstatat fstatvfs fork getmntent_r getenv getpwuid_r isatty memalign mkostemp mmap open_memstream pipe2 pread posix_fadvise posix_madvise setlocale stricmp strnicmp strptime uselocale])
+AC_REPLACE_FUNCS([aligned_alloc atof atoll dirfd fdopendir flockfile fsync getdelim getpid lfind lldiv memrchr nrand48 poll posix_memalign recvmsg rewind sendmsg setenv strcasecmp strcasestr strdup strlcpy strndup strnlen strnstr strsep strtof strtok_r strtoll swab tfind timegm timespec_get strverscmp pathconf])
 AC_REPLACE_FUNCS([gettimeofday])
 AC_CHECK_FUNC(fdatasync,,
   [AC_DEFINE(fdatasync, fsync, [Alias fdatasync() to fsync() if missing.])
diff --git a/include/vlc_fixups.h b/include/vlc_fixups.h
index 8fd01da0ce..16282aae9e 100644
--- a/include/vlc_fixups.h
+++ b/include/vlc_fixups.h
@@ -505,9 +505,11 @@ void *lfind( const void *key, const void *base, size_t *nmemb,
          lfind((a),(b), &(unsigned){ (*(c) > UINT_MAX) ? UINT_MAX : *(c) }, (d),(e))
 #endif /* _WIN64 */
 
-#ifndef HAVE_TDESTROY
 void tdestroy( void *root, void (*free_node)(void *nodep) );
-#endif
+# ifndef HAVE_TDESTROY
+void vlc_tdestroy( void *, void (*)(void *) );
+#  define tdestroy vlc_tdestroy
+# endif
 
 /* Random numbers */
 #ifndef HAVE_NRAND48
diff --git a/po/POTFILES.in b/po/POTFILES.in
index d2771b57ec..62b3645c30 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -66,6 +66,7 @@ src/config/help.c
 src/config/intf.c
 src/darwin/error.c
 src/extras/libc.c
+src/extras/tdestroy.c
 src/input/access.c
 src/input/decoder.c
 src/input/decoder.h
diff --git a/src/Makefile.am b/src/Makefile.am
index b6c5996837..978a0674b1 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -210,6 +210,7 @@ libvlccore_la_SOURCES = \
 	config/getopt.c \
 	config/vlc_getopt.h \
 	extras/libc.c \
+	extras/tdestroy.c \
 	media_source/media_source.c \
 	media_source/media_source.h \
 	media_source/media_tree.c \
-- 
2.21.0 (Apple Git-122.2)