metrics_hub: protect access to vector of metrics_listener
prevent potential race between metrics hub thread trying to access the metrics vector and another thread adding another element to it
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@ -31,6 +31,8 @@
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#include "srslte/common/threads.h"
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#include "srslte/srslte.h"
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#include <chrono>
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#include <mutex>
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#include <thread>
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#include <vector>
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namespace srslte {
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@ -54,7 +56,7 @@ template <typename metrics_t>
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class metrics_hub : public periodic_thread
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{
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public:
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metrics_hub() : m(nullptr), sleep_start(std::chrono::steady_clock::now()), periodic_thread("METRICS_HUB") {}
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metrics_hub() : sleep_start(std::chrono::steady_clock::now()), periodic_thread("METRICS_HUB") {}
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bool init(metrics_interface<metrics_t>* m_, float report_period_secs_ = 1.0)
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{
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m = m_;
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@ -73,11 +75,17 @@ public:
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wait_thread_finish();
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}
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void add_listener(metrics_listener<metrics_t>* listener) { listeners.push_back(listener); }
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void add_listener(metrics_listener<metrics_t>* listener)
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{
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std::unique_lock<std::mutex> lock(mutex);
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listeners.push_back(listener);
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}
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private:
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void run_period()
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{
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std::unique_lock<std::mutex> lock(mutex);
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// get current time and check how long we slept
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auto period_usec =
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std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::steady_clock::now() - sleep_start);
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@ -92,9 +100,10 @@ private:
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// store start of sleep period
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sleep_start = std::chrono::steady_clock::now();
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}
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metrics_interface<metrics_t>* m;
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metrics_interface<metrics_t>* m = nullptr;
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std::vector<metrics_listener<metrics_t>*> listeners;
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std::chrono::steady_clock::time_point sleep_start;
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std::mutex mutex;
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};
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} // namespace srslte
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