[libcamera-devel] [PATCH 1/2] libcamera: thread: Add a method to return the ID of the current thread
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Sat Jan 18 22:33:47 CET 2020
The current thread ID is useful when logging message to debug
concurrency issues. Add a method to retrieve it.
Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
src/libcamera/include/thread.h | 2 ++
src/libcamera/thread.cpp | 20 ++++++++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/src/libcamera/include/thread.h b/src/libcamera/include/thread.h
index 37edd4f5138b..819a9879ac56 100644
--- a/src/libcamera/include/thread.h
+++ b/src/libcamera/include/thread.h
@@ -9,6 +9,7 @@
#include <memory>
#include <mutex>
+#include <sys/types.h>
#include <thread>
#include <libcamera/signal.h>
@@ -39,6 +40,7 @@ public:
Signal<Thread *> finished;
static Thread *current();
+ static pid_t currentId();
EventDispatcher *eventDispatcher();
void setEventDispatcher(std::unique_ptr<EventDispatcher> dispatcher);
diff --git a/src/libcamera/thread.cpp b/src/libcamera/thread.cpp
index 18ebd16a7e2f..fe32cd677596 100644
--- a/src/libcamera/thread.cpp
+++ b/src/libcamera/thread.cpp
@@ -9,6 +9,9 @@
#include <atomic>
#include <list>
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
#include <libcamera/event_dispatcher.h>
@@ -62,6 +65,7 @@ private:
Thread *thread_;
bool running_;
+ pid_t tid_;
Mutex mutex_;
@@ -108,6 +112,7 @@ ThreadData *ThreadData::current()
* started, set it here.
*/
ThreadData *data = mainThread.data_;
+ data->tid_ = syscall(SYS_gettid);
currentThreadData = data;
return data;
}
@@ -189,6 +194,7 @@ void Thread::startThread()
*/
thread_local ThreadCleaner cleaner(this, &Thread::finishThread);
+ data_->tid_ = syscall(SYS_gettid);
currentThreadData = data_;
run();
@@ -308,6 +314,20 @@ Thread *Thread::current()
return data->thread_;
}
+/**
+ * \brief Retrieve the ID of the current thread
+ *
+ * The thread ID corresponds to the Linux thread ID (TID) as returned by the
+ * gettid system call.
+ *
+ * \return The ID of the current thread
+ */
+pid_t Thread::currentId()
+{
+ ThreadData *data = ThreadData::current();
+ return data->tid_;
+}
+
/**
* \brief Set the event dispatcher
* \param[in] dispatcher Pointer to the event dispatcher
--
Regards,
Laurent Pinchart
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