1 files changed, 452 insertions, 0 deletions
diff --git a/src/3rdparty/libdbus/dbus/dbus-threads.c b/src/3rdparty/libdbus/dbus/dbus-threads.c
new file mode 100644
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--- /dev/null
+++ b/src/3rdparty/libdbus/dbus/dbus-threads.c
@@ -0,0 +1,452 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* dbus-threads.h  D-Bus threads handling
+ *
+ * Copyright (C) 2002, 2003, 2006 Red Hat Inc.
+ *
+ * SPDX-License-Identifier: AFL-2.1 OR GPL-2.0-or-later
+ *
+ * Licensed under the Academic Free License version 2.1
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+#include <config.h>
+#include "dbus-threads.h"
+#include "dbus-internals.h"
+#include "dbus-threads-internal.h"
+#include "dbus-list.h"
+
+/* Protected by _dbus_threads_lock_platform_specific() */
+static int thread_init_generation = 0;
+
+/**
+ * @defgroup DBusThreadsInternals Thread functions
+ * @ingroup  DBusInternals
+ * @brief _dbus_rmutex_lock(), etc.
+ *
+ * Functions and macros related to threads and thread locks.
+ *
+ * @{
+ */
+
+/**
+ * Creates a new mutex
+ * or creates a no-op mutex if threads are not initialized.
+ * May return #NULL even if threads are initialized, indicating
+ * out-of-memory.
+ *
+ * If possible, the mutex returned by this function is recursive, to
+ * avoid deadlocks. However, that cannot be relied on.
+ *
+ * @param location_p the location of the new mutex, can return #NULL on OOM
+ */
+void
+_dbus_rmutex_new_at_location (DBusRMutex **location_p)
+{
+  _dbus_assert (location_p != NULL);
+
+  if (!dbus_threads_init_default ())
+    {
+      *location_p = NULL;
+      return;
+    }
+
+  *location_p = _dbus_platform_rmutex_new ();
+}
+
+/**
+ * Creates a new mutex
+ * or creates a no-op mutex if threads are not initialized.
+ * May return #NULL even if threads are initialized, indicating
+ * out-of-memory.
+ *
+ * The returned mutex is suitable for use with condition variables.
+ *
+ * @param location_p the location of the new mutex, can return #NULL on OOM
+ */
+void
+_dbus_cmutex_new_at_location (DBusCMutex **location_p)
+{
+  _dbus_assert (location_p != NULL);
+
+  if (!dbus_threads_init_default ())
+    {
+      *location_p = NULL;
+      return;
+    }
+
+  *location_p = _dbus_platform_cmutex_new ();
+}
+
+/**
+ * Frees a DBusRMutex; does nothing if passed a #NULL pointer.
+ */
+void
+_dbus_rmutex_free_at_location (DBusRMutex **location_p)
+{
+  if (location_p == NULL)
+    return;
+
+  if (*location_p != NULL)
+    _dbus_platform_rmutex_free (*location_p);
+}
+
+/**
+ * Frees a DBusCMutex; does nothing if passed a #NULL pointer.
+ */
+void
+_dbus_cmutex_free_at_location (DBusCMutex **location_p)
+{
+  if (location_p == NULL)
+    return;
+
+  if (*location_p != NULL)
+    _dbus_platform_cmutex_free (*location_p);
+}
+
+/**
+ * Locks a mutex. Does nothing if passed a #NULL pointer.
+ * Locks may be recursive if threading implementation initialized
+ * recursive locks.
+ */
+void
+_dbus_rmutex_lock (DBusRMutex *mutex)
+{
+  if (mutex == NULL)
+    return;
+
+  _dbus_platform_rmutex_lock (mutex);
+}
+
+/**
+ * Locks a mutex. Does nothing if passed a #NULL pointer.
+ * Locks may be recursive if threading implementation initialized
+ * recursive locks.
+ */
+void
+_dbus_cmutex_lock (DBusCMutex *mutex)
+{
+  if (mutex == NULL)
+    return;
+
+  _dbus_platform_cmutex_lock (mutex);
+}
+
+/**
+ * Unlocks a mutex. Does nothing if passed a #NULL pointer.
+ *
+ * @returns #TRUE on success
+ */
+void
+_dbus_rmutex_unlock (DBusRMutex *mutex)
+{
+  if (mutex == NULL)
+    return;
+
+  _dbus_platform_rmutex_unlock (mutex);
+}
+
+/**
+ * Unlocks a mutex. Does nothing if passed a #NULL pointer.
+ *
+ * @returns #TRUE on success
+ */
+void
+_dbus_cmutex_unlock (DBusCMutex *mutex)
+{
+  if (mutex == NULL)
+    return;
+
+  _dbus_platform_cmutex_unlock (mutex);
+}
+
+/**
+ * Creates a new condition variable using the function supplied
+ * to dbus_threads_init(), or creates a no-op condition variable
+ * if threads are not initialized. May return #NULL even if
+ * threads are initialized, indicating out-of-memory.
+ *
+ * @returns new mutex or #NULL
+ */
+DBusCondVar *
+_dbus_condvar_new (void)
+{
+  if (!dbus_threads_init_default ())
+    return NULL;
+
+  return _dbus_platform_condvar_new ();
+}
+
+
+/**
+ * This does the same thing as _dbus_condvar_new.  It however
+ * gives another level of indirection by allocating a pointer
+ * to point to the condvar location; this used to be useful.
+ *
+ * @returns the location of a new condvar or #NULL on OOM
+ */
+
+void 
+_dbus_condvar_new_at_location (DBusCondVar **location_p)
+{
+  _dbus_assert (location_p != NULL);
+
+  *location_p = _dbus_condvar_new();
+}
+
+
+/**
+ * Frees a conditional variable created with dbus_condvar_new(); does
+ * nothing if passed a #NULL pointer.
+ */
+void
+_dbus_condvar_free (DBusCondVar *cond)
+{
+  if (cond == NULL)
+    return;
+
+  _dbus_platform_condvar_free (cond);
+}
+
+/**
+ * Frees a condition variable; does nothing if passed a #NULL pointer.
+ */
+void
+_dbus_condvar_free_at_location (DBusCondVar **location_p)
+{
+  if (location_p == NULL)
+    return;
+
+  if (*location_p != NULL)
+    _dbus_platform_condvar_free (*location_p);
+}
+
+/**
+ * Atomically unlocks the mutex and waits for the conditions
+ * variable to be signalled. Locks the mutex again before
+ * returning.
+ * Does nothing if passed a #NULL pointer.
+ */
+void
+_dbus_condvar_wait (DBusCondVar *cond,
+                    DBusCMutex  *mutex)
+{
+  if (cond == NULL || mutex == NULL)
+    return;
+
+  _dbus_platform_condvar_wait (cond, mutex);
+}
+
+/**
+ * Atomically unlocks the mutex and waits for the conditions variable
+ * to be signalled, or for a timeout. Locks the mutex again before
+ * returning.  Does nothing if passed a #NULL pointer.  Return value
+ * is #FALSE if we timed out, #TRUE otherwise.
+ *
+ * @param cond the condition variable
+ * @param mutex the mutex
+ * @param timeout_milliseconds the maximum time to wait
+ * @returns #FALSE if the timeout occurred, #TRUE if not
+ */
+dbus_bool_t
+_dbus_condvar_wait_timeout (DBusCondVar               *cond,
+                            DBusCMutex                *mutex,
+                            int                        timeout_milliseconds)
+{
+  if (cond == NULL || mutex == NULL)
+    return TRUE;
+
+  return _dbus_platform_condvar_wait_timeout (cond, mutex,
+      timeout_milliseconds);
+}
+
+/**
+ * If there are threads waiting on the condition variable, wake
+ * up exactly one. 
+ * Does nothing if passed a #NULL pointer.
+ */
+void
+_dbus_condvar_wake_one (DBusCondVar *cond)
+{
+  if (cond == NULL)
+    return;
+
+  _dbus_platform_condvar_wake_one (cond);
+}
+
+/* Protected by _dbus_threads_lock_platform_specific() */
+static DBusRMutex *global_locks[_DBUS_N_GLOBAL_LOCKS] = { NULL };
+
+static void
+shutdown_global_locks (void *nil)
+{
+  int i;
+
+  for (i = 0; i < _DBUS_N_GLOBAL_LOCKS; i++)
+    {
+      _dbus_assert (global_locks[i] != NULL);
+      _dbus_platform_rmutex_free (global_locks[i]);
+      global_locks[i] = NULL;
+    }
+}
+
+static dbus_bool_t
+init_global_locks (void)
+{
+  int i;
+  dbus_bool_t ok;
+
+  for (i = 0; i < _DBUS_N_GLOBAL_LOCKS; i++)
+    {
+      _dbus_assert (global_locks[i] == NULL);
+
+      global_locks[i] = _dbus_platform_rmutex_new ();
+
+      if (global_locks[i] == NULL)
+        goto failed;
+    }
+
+  _dbus_platform_rmutex_lock (global_locks[_DBUS_LOCK_shutdown_funcs]);
+  ok = _dbus_register_shutdown_func_unlocked (shutdown_global_locks, NULL);
+  _dbus_platform_rmutex_unlock (global_locks[_DBUS_LOCK_shutdown_funcs]);
+
+  if (!ok)
+    goto failed;
+
+  return TRUE;
+
+ failed:
+  for (i = i - 1; i >= 0; i--)
+    {
+      _dbus_platform_rmutex_free (global_locks[i]);
+      global_locks[i] = NULL;
+    }
+
+  return FALSE;
+}
+
+dbus_bool_t
+_dbus_lock (DBusGlobalLock lock)
+{
+  _dbus_assert (lock >= 0);
+  _dbus_assert (lock < _DBUS_N_GLOBAL_LOCKS);
+
+  if (thread_init_generation != _dbus_current_generation &&
+      !dbus_threads_init_default ())
+    return FALSE;
+
+  _dbus_platform_rmutex_lock (global_locks[lock]);
+  return TRUE;
+}
+
+void
+_dbus_unlock (DBusGlobalLock lock)
+{
+  _dbus_assert (lock >= 0);
+  _dbus_assert (lock < _DBUS_N_GLOBAL_LOCKS);
+
+  _dbus_platform_rmutex_unlock (global_locks[lock]);
+}
+
+/** @} */ /* end of internals */
+
+/**
+ * @defgroup DBusThreads Thread functions
+ * @ingroup  DBus
+ * @brief dbus_threads_init() and dbus_threads_init_default()
+ *
+ * Functions and macros related to threads and thread locks.
+ *
+ * If threads are initialized, the D-Bus library has locks on all
+ * global data structures.  In addition, each #DBusConnection has a
+ * lock, so only one thread at a time can touch the connection.  (See
+ * @ref DBusConnection for more on connection locking.)
+ *
+ * Most other objects, however, do not have locks - they can only be
+ * used from a single thread at a time, unless you lock them yourself.
+ * For example, a #DBusMessage can't be modified from two threads
+ * at once.
+ * 
+ * @{
+ */
+
+/**
+ * Initializes threads, like dbus_threads_init_default().
+ * This version previously allowed user-specified threading
+ * primitives, but since D-Bus 1.6 it ignores them and behaves
+ * exactly like dbus_threads_init_default().
+ *
+ * @param functions ignored, formerly functions for using threads
+ * @returns #TRUE on success, #FALSE if no memory
+ */
+dbus_bool_t
+dbus_threads_init (const DBusThreadFunctions *functions)
+{
+  _dbus_threads_lock_platform_specific ();
+
+  if (thread_init_generation == _dbus_current_generation)
+    {
+      _dbus_threads_unlock_platform_specific ();
+      return TRUE;
+    }
+
+  if (!_dbus_threads_init_platform_specific() ||
+      !init_global_locks ())
+    {
+      _dbus_threads_unlock_platform_specific ();
+      return FALSE;
+    }
+
+  thread_init_generation = _dbus_current_generation;
+
+  _dbus_threads_unlock_platform_specific ();
+  return TRUE;
+}
+
+
+
+/* Default thread implemenation */
+
+/**
+ * Initializes threads. If this function is not called, the D-Bus
+ * library will not lock any data structures.  If it is called, D-Bus
+ * will do locking, at some cost in efficiency.
+ *
+ * Since D-Bus 1.7 it is safe to call this function from any thread,
+ * any number of times (but it must be called before any other
+ * libdbus API is used).
+ *
+ * In D-Bus 1.6 or older, this function must be called in the main thread
+ * before any other thread starts. As a result, it is not sufficient to
+ * call this function in a library or plugin, unless the library or plugin
+ * imposes a similar requirement on its callers.
+ *
+ * dbus_shutdown() reverses the effects of this function when it
+ * resets all global state in libdbus.
+ * 
+ * @returns #TRUE on success, #FALSE if not enough memory
+ */
+dbus_bool_t
+dbus_threads_init_default (void)
+{
+  return dbus_threads_init (NULL);
+}
+
+
+/** @} */
+
+#ifdef DBUS_ENABLE_EMBEDDED_TESTS
+
+#endif /* DBUS_ENABLE_EMBEDDED_TESTS */