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Thread safety analysis: Test and document release_generic_capability 

The old locking attributes had a generic release, but as it turns out
the capability-based attributes have it as well.

Reviewed By: aaron.ballman

Differential Revision: https://reviews.llvm.org/D87064
This commit is contained in:
Aaron Puchert 2020-09-06 20:34:32 +02:00
parent 8c386c9474
commit cc6713a2c3
2 changed files with 18 additions and 11 deletions
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26
clang/docs/ThreadSafetyAnalysis.rst
View File

@ -209,21 +209,21 @@ must be held on entry to the function, *and must still be held on exit*.
}
ACQUIRE(...), ACQUIRE_SHARED(...), RELEASE(...), RELEASE_SHARED(...)
--------------------------------------------------------------------
ACQUIRE(...), ACQUIRE_SHARED(...), RELEASE(...), RELEASE_SHARED(...), RELEASE_GENERIC(...)
------------------------------------------------------------------------------------------
*Previously*: ``EXCLUSIVE_LOCK_FUNCTION``, ``SHARED_LOCK_FUNCTION``,
``UNLOCK_FUNCTION``
``ACQUIRE`` is an attribute on functions or methods, which
declares that the function acquires a capability, but does not release it. The
caller must not hold the given capability on entry, and it will hold the
capability on exit. ``ACQUIRE_SHARED`` is similar.
``ACQUIRE`` and ``ACQUIRE_SHARED`` are attributes on functions or methods
declaring that the function acquires a capability, but does not release it.
The given capability must not be held on entry, and will be held on exit
(exclusively for ``ACQUIRE``, shared for ``ACQUIRE_SHARED``).
``RELEASE`` and ``RELEASE_SHARED`` declare that the function releases the given
capability. The caller must hold the capability on entry, and will no longer
hold it on exit. It does not matter whether the given capability is shared or
exclusive.
``RELEASE``, ``RELEASE_SHARED``, and ``RELEASE_GENERIC`` declare that the
function releases the given capability. The capability must be held on entry
(exclusively for ``RELEASE``, shared for ``RELEASE_SHARED``, exclusively or
shared for ``RELEASE_GENERIC``), and will no longer be held on exit.
.. code-block:: c++
@ -820,6 +820,9 @@ implementation.
#define RELEASE_SHARED(...) \
THREAD_ANNOTATION_ATTRIBUTE__(release_shared_capability(__VA_ARGS__))
#define RELEASE_GENERIC(...) \
THREAD_ANNOTATION_ATTRIBUTE__(release_generic_capability(__VA_ARGS__))
#define TRY_ACQUIRE(...) \
THREAD_ANNOTATION_ATTRIBUTE__(try_acquire_capability(__VA_ARGS__))
@ -864,6 +867,9 @@ implementation.
// Release/unlock a shared mutex.
void ReaderUnlock() RELEASE_SHARED();
// Generic unlock, can unlock exclusive and shared mutexes.
void GenericUnlock() RELEASE_GENERIC();
// Try to acquire the mutex. Returns true on success, and false on failure.
bool TryLock() TRY_ACQUIRE(true);

3
clang/test/SemaCXX/thread-safety-annotations.h
View File

@ -6,6 +6,7 @@
#define ASSERT_SHARED_LOCK(...) __attribute__((assert_shared_capability(__VA_ARGS__)))
#define EXCLUSIVE_LOCK_FUNCTION(...) __attribute__((acquire_capability(__VA_ARGS__)))
#define SHARED_LOCK_FUNCTION(...) __attribute__((acquire_shared_capability(__VA_ARGS__)))
#define UNLOCK_FUNCTION(...) __attribute__((release_generic_capability(__VA_ARGS__)))
#define EXCLUSIVE_TRYLOCK_FUNCTION(...) __attribute__((try_acquire_capability(__VA_ARGS__)))
#define SHARED_TRYLOCK_FUNCTION(...) __attribute__((try_acquire_shared_capability(__VA_ARGS__)))
#define EXCLUSIVE_LOCKS_REQUIRED(...) __attribute__((requires_capability(__VA_ARGS__)))
@ -16,6 +17,7 @@
#define ASSERT_SHARED_LOCK(...) __attribute__((assert_shared_lock(__VA_ARGS__)))
#define EXCLUSIVE_LOCK_FUNCTION(...) __attribute__((exclusive_lock_function(__VA_ARGS__)))
#define SHARED_LOCK_FUNCTION(...) __attribute__((shared_lock_function(__VA_ARGS__)))
#define UNLOCK_FUNCTION(...) __attribute__((unlock_function(__VA_ARGS__)))
#define EXCLUSIVE_TRYLOCK_FUNCTION(...) __attribute__((exclusive_trylock_function(__VA_ARGS__)))
#define SHARED_TRYLOCK_FUNCTION(...) __attribute__((shared_trylock_function(__VA_ARGS__)))
#define EXCLUSIVE_LOCKS_REQUIRED(...) __attribute__((exclusive_locks_required(__VA_ARGS__)))
@ -23,7 +25,6 @@
#endif
// Lock semantics only
#define UNLOCK_FUNCTION(...) __attribute__((unlock_function(__VA_ARGS__)))
#define GUARDED_VAR __attribute__((guarded_var))
#define PT_GUARDED_VAR __attribute__((pt_guarded_var))