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#include <c10/util/WaitCounter.h>
#include <c10/util/Synchronized.h>
#include <c10/util/WaitCounterDynamicBackend.h>
#include <chrono>
#include <memory>
#include <string>
#include <string_view>
#include <unordered_map>
#include <vector>
#ifndef _WIN32
#include <dlfcn.h>
#endif
namespace c10::monitor {
namespace detail {
namespace {
using WaitCounterBackendFactories =
std::vector<std::shared_ptr<WaitCounterBackendFactoryIf>>;
Synchronized<WaitCounterBackendFactories>& waitCounterBackendFactories() {
static auto instance = new Synchronized<WaitCounterBackendFactories>();
return *instance;
}
class DynamicBackendWrapper : public WaitCounterBackendIf {
public:
explicit DynamicBackendWrapper(WaitCounterDynamicBackend impl)
: impl_{impl} {}
DynamicBackendWrapper(const DynamicBackendWrapper&) = delete;
DynamicBackendWrapper(DynamicBackendWrapper&&) = delete;
DynamicBackendWrapper& operator=(const DynamicBackendWrapper&) = delete;
DynamicBackendWrapper& operator=(DynamicBackendWrapper&&) = delete;
~DynamicBackendWrapper() override {
impl_.destroy(impl_.self);
}
intptr_t start(std::chrono::steady_clock::time_point now) noexcept override {
return impl_.start(
impl_.self,
std::chrono::duration_cast<std::chrono::microseconds>(
now.time_since_epoch())
.count());
}
void stop(std::chrono::steady_clock::time_point now, intptr_t ctx) noexcept
override {
return impl_.stop(
impl_.self,
std::chrono::duration_cast<std::chrono::microseconds>(
now.time_since_epoch())
.count(),
ctx);
}
private:
WaitCounterDynamicBackend impl_;
};
std::unique_ptr<WaitCounterBackendIf> getDynamicBackend(std::string_view key) {
static auto dynamicBackendInit =
reinterpret_cast<WaitCounterDynamicBackendInit>([]() -> void* {
#ifndef _WIN32
return dlsym(
RTLD_DEFAULT,
std::string(kWaitCounterDynamicBackendInitFn).c_str());
#else
return nullptr;
#endif
}());
if (!dynamicBackendInit) {
return nullptr;
}
WaitCounterDynamicBackend backend;
dynamicBackendInit(&backend, &key[0], key.size());
if (!backend.self) {
return nullptr;
}
return std::make_unique<DynamicBackendWrapper>(backend);
}
} // namespace
class WaitCounterImpl {
public:
static WaitCounterImpl& getInstance(std::string_view key) {
static auto& implMapSynchronized = *new Synchronized<
std::unordered_map<std::string, std::unique_ptr<WaitCounterImpl>>>();
return *implMapSynchronized.withLock([&](auto& implMap) {
if (auto implIt = implMap.find(std::string(key));
implIt != implMap.end()) {
return implIt->second.get();
}
auto [implIt, emplaceSuccess] = implMap.emplace(
std::string{key},
std::unique_ptr<WaitCounterImpl>(new WaitCounterImpl(key)));
assert(emplaceSuccess);
return implIt->second.get();
});
}
SmallVector<intptr_t> start() noexcept {
auto now = std::chrono::steady_clock::now();
SmallVector<intptr_t> ctxs;
ctxs.reserve(backends_.size());
for (const auto& backend : backends_) {
ctxs.push_back(backend->start(now));
}
return ctxs;
}
void stop(const SmallVector<intptr_t>& ctxs) noexcept {
auto now = std::chrono::steady_clock::now();
assert(ctxs.size() == backends_.size());
for (size_t i = 0; i < ctxs.size(); ++i) {
backends_[i]->stop(now, ctxs[i]);
}
}
private:
explicit WaitCounterImpl(std::string_view key) {
auto factoriesCopy = waitCounterBackendFactories().withLock(
[](auto& factories) { return factories; });
for (const auto& factory : factoriesCopy) {
if (auto backend = factory->create(key)) {
backends_.push_back(std::move(backend));
}
}
if (auto backend = getDynamicBackend(key)) {
backends_.push_back(std::move(backend));
}
}
SmallVector<std::unique_ptr<WaitCounterBackendIf>> backends_;
};
void registerWaitCounterBackend(
std::unique_ptr<WaitCounterBackendFactoryIf> factory) {
waitCounterBackendFactories().withLock(
[&](auto& factories) { factories.push_back(std::move(factory)); });
}
std::vector<std::shared_ptr<WaitCounterBackendFactoryIf>>
getRegisteredWaitCounterBackends() {
return waitCounterBackendFactories().withLock(
[](auto& factories) { return factories; });
}
} // namespace detail
WaitCounterHandle::WaitCounterHandle(std::string_view key)
: impl_(detail::WaitCounterImpl::getInstance(key)) {}
WaitCounterHandle::WaitGuard WaitCounterHandle::start() {
return WaitCounterHandle::WaitGuard(*this, impl_.start());
}
void WaitCounterHandle::stop(const SmallVector<intptr_t>& ctxs) {
return impl_.stop(ctxs);
}
} // namespace c10::monitor
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