--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/lib/vtls/polarssl_threadlock.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,144 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2013-2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2010, 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+#include "curl_setup.h"
+
+#if (defined(USE_POLARSSL) || defined(USE_MBEDTLS)) && \
+    ((defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)) || \
+     (defined(USE_THREADS_WIN32) && defined(HAVE_PROCESS_H)))
+
+#if defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)
+#  include <pthread.h>
+#  define POLARSSL_MUTEX_T pthread_mutex_t
+#elif defined(USE_THREADS_WIN32) && defined(HAVE_PROCESS_H)
+#  include <process.h>
+#  define POLARSSL_MUTEX_T HANDLE
+#endif
+
+#include "polarssl_threadlock.h"
+#include "curl_printf.h"
+#include "curl_memory.h"
+/* The last #include file should be: */
+#include "memdebug.h"
+
+/* number of thread locks */
+#define NUMT                    2
+
+/* This array will store all of the mutexes available to PolarSSL. */
+static POLARSSL_MUTEX_T *mutex_buf = NULL;
+
+int Curl_polarsslthreadlock_thread_setup(void)
+{
+  int i;
+
+  mutex_buf = calloc(NUMT * sizeof(POLARSSL_MUTEX_T), 1);
+  if(!mutex_buf)
+    return 0;     /* error, no number of threads defined */
+
+  for(i = 0;  i < NUMT;  i++) {
+    int ret;
+#if defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)
+    ret = pthread_mutex_init(&mutex_buf[i], NULL);
+    if(ret)
+      return 0; /* pthread_mutex_init failed */
+#elif defined(USE_THREADS_WIN32) && defined(HAVE_PROCESS_H)
+    mutex_buf[i] = CreateMutex(0, FALSE, 0);
+    if(mutex_buf[i] == 0)
+      return 0;  /* CreateMutex failed */
+#endif /* USE_THREADS_POSIX && HAVE_PTHREAD_H */
+  }
+
+  return 1; /* OK */
+}
+
+int Curl_polarsslthreadlock_thread_cleanup(void)
+{
+  int i;
+
+  if(!mutex_buf)
+    return 0; /* error, no threads locks defined */
+
+  for(i = 0; i < NUMT; i++) {
+    int ret;
+#if defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)
+    ret = pthread_mutex_destroy(&mutex_buf[i]);
+    if(ret)
+      return 0; /* pthread_mutex_destroy failed */
+#elif defined(USE_THREADS_WIN32) && defined(HAVE_PROCESS_H)
+    ret = CloseHandle(mutex_buf[i]);
+    if(!ret)
+      return 0; /* CloseHandle failed */
+#endif /* USE_THREADS_POSIX && HAVE_PTHREAD_H */
+  }
+  free(mutex_buf);
+  mutex_buf = NULL;
+
+  return 1; /* OK */
+}
+
+int Curl_polarsslthreadlock_lock_function(int n)
+{
+  if(n < NUMT) {
+    int ret;
+#if defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)
+    ret = pthread_mutex_lock(&mutex_buf[n]);
+    if(ret) {
+      DEBUGF(fprintf(stderr,
+                     "Error: polarsslthreadlock_lock_function failed\n"));
+      return 0; /* pthread_mutex_lock failed */
+    }
+#elif defined(USE_THREADS_WIN32) && defined(HAVE_PROCESS_H)
+    ret = (WaitForSingleObject(mutex_buf[n], INFINITE) == WAIT_FAILED?1:0);
+    if(ret) {
+      DEBUGF(fprintf(stderr,
+                     "Error: polarsslthreadlock_lock_function failed\n"));
+      return 0; /* pthread_mutex_lock failed */
+    }
+#endif /* USE_THREADS_POSIX && HAVE_PTHREAD_H */
+  }
+  return 1; /* OK */
+}
+
+int Curl_polarsslthreadlock_unlock_function(int n)
+{
+  if(n < NUMT) {
+    int ret;
+#if defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)
+    ret = pthread_mutex_unlock(&mutex_buf[n]);
+    if(ret) {
+      DEBUGF(fprintf(stderr,
+                     "Error: polarsslthreadlock_unlock_function failed\n"));
+      return 0; /* pthread_mutex_unlock failed */
+    }
+#elif defined(USE_THREADS_WIN32) && defined(HAVE_PROCESS_H)
+    ret = ReleaseMutex(mutex_buf[n]);
+    if(!ret) {
+      DEBUGF(fprintf(stderr,
+                     "Error: polarsslthreadlock_unlock_function failed\n"));
+      return 0; /* pthread_mutex_lock failed */
+    }
+#endif /* USE_THREADS_POSIX && HAVE_PTHREAD_H */
+  }
+  return 1; /* OK */
+}
+
+#endif /* USE_POLARSSL || USE_MBEDTLS */