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#pragma once
#include <chrono>
#include <memory>
#include <string_view>
#include <c10/macros/Macros.h>
#include <c10/util/ScopeExit.h>
#include <c10/util/SmallVector.h>
namespace c10::monitor {
namespace detail {
class WaitCounterImpl;
class WaitCounterBackendIf {
public:
virtual ~WaitCounterBackendIf() = default;
virtual intptr_t start(
std::chrono::steady_clock::time_point now) noexcept = 0;
virtual void stop(
std::chrono::steady_clock::time_point now,
intptr_t ctx) noexcept = 0;
};
class WaitCounterBackendFactoryIf {
public:
virtual ~WaitCounterBackendFactoryIf() = default;
// May return nullptr.
// In this case the counter will be ignored by the given backend.
virtual std::unique_ptr<WaitCounterBackendIf> create(
std::string_view key) noexcept = 0;
};
C10_API void registerWaitCounterBackend(
std::unique_ptr<WaitCounterBackendFactoryIf>);
C10_API std::vector<std::shared_ptr<WaitCounterBackendFactoryIf>>
getRegisteredWaitCounterBackends();
} // namespace detail
// A handle to a wait counter.
class C10_API WaitCounterHandle {
public:
explicit WaitCounterHandle(std::string_view key);
class WaitGuard {
public:
WaitGuard(WaitGuard&& other) noexcept
: handle_{std::exchange(other.handle_, {})},
ctxs_{std::move(other.ctxs_)} {}
WaitGuard(const WaitGuard&) = delete;
WaitGuard& operator=(const WaitGuard&) = delete;
WaitGuard& operator=(WaitGuard&&) = delete;
~WaitGuard() {
stop();
}
void stop() {
if (auto handle = std::exchange(handle_, nullptr)) {
handle->stop(ctxs_);
}
}
private:
WaitGuard(WaitCounterHandle& handle, SmallVector<intptr_t>&& ctxs)
: handle_{&handle}, ctxs_{std::move(ctxs)} {}
friend class WaitCounterHandle;
WaitCounterHandle* handle_;
SmallVector<intptr_t> ctxs_;
};
// Starts a waiter
WaitGuard start();
private:
// Stops the waiter. Each start() call should be matched by exactly one stop()
// call.
void stop(const SmallVector<intptr_t>& ctxs);
// NOLINTNEXTLINE(cppcoreguidelines-avoid-const-or-ref-data-members)
detail::WaitCounterImpl& impl_;
};
} // namespace c10::monitor
#define STATIC_WAIT_COUNTER(_key) \
[]() -> ::c10::monitor::WaitCounterHandle& { \
static ::c10::monitor::WaitCounterHandle handle(#_key); \
return handle; \
}()
#define STATIC_SCOPED_WAIT_COUNTER(_name) \
auto C10_ANONYMOUS_VARIABLE(SCOPE_GUARD) = STATIC_WAIT_COUNTER(_name).start();
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