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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_TRACEPOINT_PROVIDER_H
#define CEPH_TRACEPOINT_PROVIDER_H
#include "common/ceph_context.h"
#include "common/config_obs.h"
#include "common/ceph_mutex.h"
#include <dlfcn.h>
class TracepointProvider : public md_config_obs_t {
public:
struct Traits {
const char *library;
const char *config_key;
Traits(const char *library, const char *config_key)
: library(library), config_key(config_key) {
}
};
class Singleton {
public:
Singleton(CephContext *cct, const char *library, const char *config_key)
: tracepoint_provider(new TracepointProvider(cct, library, config_key)) {
}
~Singleton() {
delete tracepoint_provider;
}
inline bool is_enabled() const {
return tracepoint_provider->m_handle != nullptr;
}
private:
TracepointProvider *tracepoint_provider;
};
template <const Traits &traits>
class TypedSingleton : public Singleton {
public:
explicit TypedSingleton(CephContext *cct)
: Singleton(cct, traits.library, traits.config_key) {
}
};
TracepointProvider(CephContext *cct, const char *library,
const char *config_key);
~TracepointProvider() override;
TracepointProvider(const TracepointProvider&) = delete;
TracepointProvider operator =(const TracepointProvider&) = delete;
TracepointProvider(TracepointProvider&&) = delete;
TracepointProvider operator =(TracepointProvider&&) = delete;
template <const Traits &traits>
static void initialize(CephContext *cct) {
#ifdef WITH_LTTNG
cct->lookup_or_create_singleton_object<TypedSingleton<traits>>(
traits.library, false, cct);
#endif
}
protected:
const char** get_tracked_conf_keys() const override {
return m_config_keys;
}
void handle_conf_change(const ConfigProxy& conf,
const std::set <std::string> &changed) override;
private:
CephContext *m_cct;
std::string m_library;
mutable const char* m_config_keys[2];
ceph::mutex m_lock = ceph::make_mutex("TracepointProvider::m_lock");
void* m_handle = nullptr;
void verify_config(const ConfigProxy& conf);
};
#endif // CEPH_TRACEPOINT_PROVIDER_H
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