[libcamera-devel,1/7] libcamera: base: semaphore: Apply clang thread safety annotation
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Message ID 20211203164619.1541033-2-hiroh@chromium.org
State Accepted
Headers show
Series
  • Apply clang thread safety annotation libcamera-core and v4l2
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Commit Message

Hirokazu Honda Dec. 3, 2021, 4:46 p.m. UTC 
This annotates member functions and variables of Semaphore by
clang thread safety annotations.

Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
---
 include/libcamera/base/semaphore.h | 10 +++++-----
 src/libcamera/base/semaphore.cpp   |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

Patch
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diff --git a/include/libcamera/base/semaphore.h b/include/libcamera/base/semaphore.h
index c11e8dd1..f1052317 100644
--- a/include/libcamera/base/semaphore.h
+++ b/include/libcamera/base/semaphore.h
@@ -18,15 +18,15 @@  class Semaphore
 public:
 	Semaphore(unsigned int n = 0);
 
-	unsigned int available();
-	void acquire(unsigned int n = 1);
-	bool tryAcquire(unsigned int n = 1);
-	void release(unsigned int n = 1);
+	unsigned int available() LIBCAMERA_TSA_EXCLUDES(mutex_);
+	void acquire(unsigned int n = 1) LIBCAMERA_TSA_EXCLUDES(mutex_);
+	bool tryAcquire(unsigned int n = 1) LIBCAMERA_TSA_EXCLUDES(mutex_);
+	void release(unsigned int n = 1) LIBCAMERA_TSA_EXCLUDES(mutex_);
 
 private:
 	Mutex mutex_;
 	ConditionVariable cv_;
-	unsigned int available_;
+	unsigned int available_ LIBCAMERA_TSA_GUARDED_BY(mutex_);
 };
 
 } /* namespace libcamera */
diff --git a/src/libcamera/base/semaphore.cpp b/src/libcamera/base/semaphore.cpp
index 4fe30293..1e1c2efa 100644
--- a/src/libcamera/base/semaphore.cpp
+++ b/src/libcamera/base/semaphore.cpp
@@ -56,7 +56,7 @@  unsigned int Semaphore::available()
 void Semaphore::acquire(unsigned int n)
 {
 	MutexLocker locker(mutex_);
-	cv_.wait(locker, [&] { return available_ >= n; });
+	cv_.wait(locker, [&]() LIBCAMERA_TSA_REQUIRES(mutex_) { return available_ >= n; });
 	available_ -= n;
 }