Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 98 insertions, 0 deletions

diff --git a/third_party/libwebrtc/rtc_base/thread_annotations.h b/third_party/libwebrtc/rtc_base/thread_annotations.h
new file mode 100644
index 0000000000..689f6681cc
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/thread_annotations.h
@@ -0,0 +1,98 @@
+//
+// Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS.  All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+//
+// Borrowed from
+// https://code.google.com/p/gperftools/source/browse/src/base/thread_annotations.h
+// but adapted for clang attributes instead of the gcc.
+//
+// This header file contains the macro definitions for thread safety
+// annotations that allow the developers to document the locking policies
+// of their multi-threaded code. The annotations can also help program
+// analysis tools to identify potential thread safety issues.
+
+#ifndef RTC_BASE_THREAD_ANNOTATIONS_H_
+#define RTC_BASE_THREAD_ANNOTATIONS_H_
+
+#if defined(__clang__) && (!defined(SWIG))
+#define RTC_THREAD_ANNOTATION_ATTRIBUTE__(x) __attribute__((x))
+#else
+#define RTC_THREAD_ANNOTATION_ATTRIBUTE__(x)  // no-op
+#endif
+
+// Document if a shared variable/field needs to be protected by a lock.
+// GUARDED_BY allows the user to specify a particular lock that should be
+// held when accessing the annotated variable.
+#define RTC_GUARDED_BY(x) RTC_THREAD_ANNOTATION_ATTRIBUTE__(guarded_by(x))
+
+// Document if the memory location pointed to by a pointer should be guarded
+// by a lock when dereferencing the pointer. Note that a pointer variable to a
+// shared memory location could itself be a shared variable. For example, if a
+// shared global pointer q, which is guarded by mu1, points to a shared memory
+// location that is guarded by mu2, q should be annotated as follows:
+//     int *q GUARDED_BY(mu1) PT_GUARDED_BY(mu2);
+#define RTC_PT_GUARDED_BY(x) RTC_THREAD_ANNOTATION_ATTRIBUTE__(pt_guarded_by(x))
+
+// Document the acquisition order between locks that can be held
+// simultaneously by a thread. For any two locks that need to be annotated
+// to establish an acquisition order, only one of them needs the annotation.
+// (i.e. You don't have to annotate both locks with both ACQUIRED_AFTER
+// and ACQUIRED_BEFORE.)
+#define RTC_ACQUIRED_AFTER(x) \
+  RTC_THREAD_ANNOTATION_ATTRIBUTE__(acquired_after(x))
+#define RTC_ACQUIRED_BEFORE(x) \
+  RTC_THREAD_ANNOTATION_ATTRIBUTE__(acquired_before(x))
+
+// The following three annotations document the lock requirements for
+// functions/methods.
+
+// Document if a function expects certain locks to be held before it is called
+#define RTC_EXCLUSIVE_LOCKS_REQUIRED(...) \
+  RTC_THREAD_ANNOTATION_ATTRIBUTE__(exclusive_locks_required(__VA_ARGS__))
+#define RTC_SHARED_LOCKS_REQUIRED(...) \
+  RTC_THREAD_ANNOTATION_ATTRIBUTE__(shared_locks_required(__VA_ARGS__))
+
+// Document the locks acquired in the body of the function. These locks
+// cannot be held when calling this function (as google3's Mutex locks are
+// non-reentrant).
+#define RTC_LOCKS_EXCLUDED(...) \
+  RTC_THREAD_ANNOTATION_ATTRIBUTE__(locks_excluded(__VA_ARGS__))
+
+// Document the lock the annotated function returns without acquiring it.
+#define RTC_LOCK_RETURNED(x) RTC_THREAD_ANNOTATION_ATTRIBUTE__(lock_returned(x))
+
+// Document if a class/type is a lockable type (such as the Mutex class).
+#define RTC_LOCKABLE RTC_THREAD_ANNOTATION_ATTRIBUTE__(lockable)
+
+// Document if a class is a scoped lockable type (such as the MutexLock class).
+#define RTC_SCOPED_LOCKABLE RTC_THREAD_ANNOTATION_ATTRIBUTE__(scoped_lockable)
+
+// The following annotations specify lock and unlock primitives.
+#define RTC_EXCLUSIVE_LOCK_FUNCTION(...) \
+  RTC_THREAD_ANNOTATION_ATTRIBUTE__(exclusive_lock_function(__VA_ARGS__))
+
+#define RTC_SHARED_LOCK_FUNCTION(...) \
+  RTC_THREAD_ANNOTATION_ATTRIBUTE__(shared_lock_function(__VA_ARGS__))
+
+#define RTC_EXCLUSIVE_TRYLOCK_FUNCTION(...) \
+  RTC_THREAD_ANNOTATION_ATTRIBUTE__(exclusive_trylock_function(__VA_ARGS__))
+
+#define RTC_SHARED_TRYLOCK_FUNCTION(...) \
+  RTC_THREAD_ANNOTATION_ATTRIBUTE__(shared_trylock_function(__VA_ARGS__))
+
+#define RTC_UNLOCK_FUNCTION(...) \
+  RTC_THREAD_ANNOTATION_ATTRIBUTE__(unlock_function(__VA_ARGS__))
+
+#define RTC_ASSERT_EXCLUSIVE_LOCK(...) \
+  RTC_THREAD_ANNOTATION_ATTRIBUTE__(assert_exclusive_lock(__VA_ARGS__))
+
+// An escape hatch for thread safety analysis to ignore the annotated function.
+#define RTC_NO_THREAD_SAFETY_ANALYSIS \
+  RTC_THREAD_ANNOTATION_ATTRIBUTE__(no_thread_safety_analysis)
+
+#endif  // RTC_BASE_THREAD_ANNOTATIONS_H_