From 923cf7f40a7f1875874384b30a7c8dcb1f23467a Mon Sep 17 00:00:00 2001
From: Hirokazu Honda <hiroh@chromium.org>
Date: Wed, 1 Dec 2021 16:53:37 +0900
Subject: libcamera: base: Introduce ConditionVariable

ConditionVariable is alias to std::condition_variable. This replaces
std::condition_variable with the ConditionVariable. It enables
replacing ConditionVariable implementation easily in the following
patches.

Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 include/libcamera/base/semaphore.h | 4 +---
 include/libcamera/base/thread.h    | 2 ++
 src/android/camera_stream.h        | 3 +--
 src/libcamera/base/thread.cpp      | 8 ++++++--
 src/libcamera/camera_manager.cpp   | 3 +--
 src/v4l2/v4l2_camera.h             | 2 +-
 6 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/include/libcamera/base/semaphore.h b/include/libcamera/base/semaphore.h
index ae87d319..ec05fad3 100644
--- a/include/libcamera/base/semaphore.h
+++ b/include/libcamera/base/semaphore.h
@@ -7,8 +7,6 @@
 
 #pragma once
 
-#include <condition_variable>
-
 #include <libcamera/base/private.h>
 #include <libcamera/base/thread.h>
 
@@ -26,7 +24,7 @@ public:
 
 private:
 	Mutex mutex_;
-	std::condition_variable cv_;
+	ConditionVariable cv_;
 	unsigned int available_;
 };
 
diff --git a/include/libcamera/base/thread.h b/include/libcamera/base/thread.h
index 32ebc80a..1ebf8363 100644
--- a/include/libcamera/base/thread.h
+++ b/include/libcamera/base/thread.h
@@ -7,6 +7,7 @@
 
 #pragma once
 
+#include <condition_variable>
 #include <memory>
 #include <mutex>
 #include <sys/types.h>
@@ -26,6 +27,7 @@ class Object;
 class ThreadData;
 class ThreadMain;
 
+using ConditionVariable = std::condition_variable;
 using Mutex = std::mutex;
 using MutexLocker = std::unique_lock<std::mutex>;
 
diff --git a/src/android/camera_stream.h b/src/android/camera_stream.h
index e9da75f0..e4808369 100644
--- a/src/android/camera_stream.h
+++ b/src/android/camera_stream.h
@@ -7,7 +7,6 @@
 
 #pragma once
 
-#include <condition_variable>
 #include <memory>
 #include <mutex>
 #include <queue>
@@ -154,7 +153,7 @@ private:
 		PostProcessor *postProcessor_;
 
 		libcamera::Mutex mutex_;
-		std::condition_variable cv_;
+		libcamera::ConditionVariable cv_;
 
 		std::queue<Camera3RequestDescriptor::StreamBuffer *> requests_;
 		State state_ = State::Stopped;
diff --git a/src/libcamera/base/thread.cpp b/src/libcamera/base/thread.cpp
index d0ca30e3..b893135f 100644
--- a/src/libcamera/base/thread.cpp
+++ b/src/libcamera/base/thread.cpp
@@ -8,7 +8,6 @@
 #include <libcamera/base/thread.h>
 
 #include <atomic>
-#include <condition_variable>
 #include <list>
 #include <sys/syscall.h>
 #include <sys/types.h>
@@ -158,7 +157,7 @@ private:
 
 	std::atomic<EventDispatcher *> dispatcher_;
 
-	std::condition_variable cv_;
+	ConditionVariable cv_;
 	std::atomic<bool> exit_;
 	int exitCode_;
 
@@ -205,6 +204,11 @@ ThreadData *ThreadData::current()
 	return data;
 }
 
+/**
+ * \typedef ConditionVariable
+ * \brief An alias for std::condition_variable
+ */
+
 /**
  * \typedef Mutex
  * \brief An alias for std::mutex
diff --git a/src/libcamera/camera_manager.cpp b/src/libcamera/camera_manager.cpp
index e78bb1d7..77ff3bd1 100644
--- a/src/libcamera/camera_manager.cpp
+++ b/src/libcamera/camera_manager.cpp
@@ -7,7 +7,6 @@
 
 #include <libcamera/camera_manager.h>
 
-#include <condition_variable>
 #include <map>
 
 #include <libcamera/camera.h>
@@ -63,7 +62,7 @@ private:
 	void createPipelineHandlers();
 	void cleanup();
 
-	std::condition_variable cv_;
+	ConditionVariable cv_;
 	bool initialized_;
 	int status_;
 
diff --git a/src/v4l2/v4l2_camera.h b/src/v4l2/v4l2_camera.h
index 94263b2f..4afbb331 100644
--- a/src/v4l2/v4l2_camera.h
+++ b/src/v4l2/v4l2_camera.h
@@ -82,6 +82,6 @@ private:
 	int efd_;
 
 	libcamera::Mutex bufferMutex_;
-	std::condition_variable bufferCV_;
+	libcamera::ConditionVariable bufferCV_;
 	unsigned int bufferAvailableCount_;
 };
-- 
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