mirror of
https://github.com/codership/wsrep-lib.git
synced 2025-04-19 21:02:17 +03:00
9318a50d18
This commit defines a TLS service interface. If the implementation is provided by the application when the provider is loaded, appropriate hooks are probed from the provider and the provider side hooks are initialized after the provider is loaded. A sample implementation to demostrate the use of TLS interface is provided in dbsim/db_tls.cpp. Also contains a change to thread service interface: The thread exit virtual method was changed to function pointer to allow thread exit path which does not involve C++.
728 lines
21 KiB
C++
728 lines
21 KiB
C++
/*
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* Copyright (C) 2019 Codership Oy <info@codership.com>
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*
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* This file is part of wsrep-lib.
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*
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* Wsrep-lib is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* Wsrep-lib is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "db_threads.hpp"
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#include "wsrep/compiler.hpp"
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#include "wsrep/logger.hpp"
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#include <cassert>
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#include <pthread.h>
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#include <algorithm>
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#include <atomic>
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#include <chrono>
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#include <map>
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#include <mutex>
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#include <ostream>
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#include <sstream>
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#include <thread>
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#include <unordered_map>
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#include <vector>
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extern "C" { static void* start_thread(void* args_ptr); }
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namespace
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{
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struct ti_obj
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{
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};
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enum ti_opcode
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{
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oc_thread_create,
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oc_thread_destroy,
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oc_mutex_create,
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oc_mutex_destroy,
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oc_mutex_lock,
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oc_mutex_trylock,
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oc_mutex_unlock,
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oc_cond_create,
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oc_cond_destroy,
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oc_cond_wait,
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oc_cond_timedwait,
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oc_cond_signal,
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oc_cond_broadcast,
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oc_max // must be the last
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};
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static const char* ti_opstring(enum ti_opcode op)
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{
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switch (op)
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{
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case oc_thread_create: return "thread_create";
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case oc_thread_destroy: return "thread_destroy";
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case oc_mutex_create: return "mutex_create";
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case oc_mutex_destroy: return "mutex_destroy";
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case oc_mutex_lock: return "mutex_lock";
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case oc_mutex_trylock: return "mutex_trylock";
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case oc_mutex_unlock: return "mutex_unlock";
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case oc_cond_create: return "cond_create";
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case oc_cond_destroy: return "cond_destroy";
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case oc_cond_wait: return "cond_wait";
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case oc_cond_timedwait: return "cond_timedwait";
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case oc_cond_signal: return "cond_signal";
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case oc_cond_broadcast: return "cond_broadcast";
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default: return "unknown";
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}
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}
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static std::vector<std::string> key_vec;
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static std::atomic<int> key_cnt;
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static std::vector<std::vector<size_t>> ops_map;
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static std::vector<std::mutex*> ops_map_sync;
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static struct ops_map_sync_deleter
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{
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~ops_map_sync_deleter()
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{
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std::for_each(ops_map_sync.begin(), ops_map_sync.end(),
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[](auto entry) { delete entry; });
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}
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} ops_map_sync_deleter;
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static std::array<std::atomic<size_t>, oc_max> total_ops;
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static std::atomic<size_t> total_allocations;
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static std::atomic<size_t> mutex_contention;
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static std::unordered_map<std::string, size_t> mutex_contention_counts;
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static int op_level;
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// Check correct condition variable usage:
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// - Associated mutex must be locked when waiting for cond
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// - There must be at least one waiter when signalling for condition
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static bool cond_checks;
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static inline void cond_check(bool condition, const char* name,
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const char* message)
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{
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if (cond_checks && !condition)
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{
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wsrep::log_error() << "Condition variable check failed for '"
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<< name << "': " << message;
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::abort();
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}
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}
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static inline int append_key(const char* name, const char* type)
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{
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key_vec.push_back(std::string(name) + "_" + type);
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wsrep::log_info() << "Register key " << name << "_" << type
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<< " with index " << (key_cnt + 1);
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ops_map.push_back(std::vector<size_t>());
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ops_map_sync.push_back(new std::mutex());
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ops_map.back().resize(oc_max);
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return ++key_cnt;
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}
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template <class Key> static inline size_t get_key_index(const Key* key)
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{
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size_t index(reinterpret_cast<const size_t>(key) - 1);
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assert(index < key_vec.size());
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return index;
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}
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template <class Key>
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static inline const char* get_key_name(const Key* key)
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{
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return key_vec[get_key_index(key)].c_str();
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}
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static inline const std::string& get_key_name_by_index(size_t index)
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{
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assert(index < key_vec.size());
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return key_vec[index];
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}
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// Note: Do not refer the obj pointer in this function, it may
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// have been deleted before the call.
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template <class Key>
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static inline void update_ops(const ti_obj* obj,
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const Key* key,
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enum ti_opcode op)
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{
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if (op_level < 1)
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return;
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total_ops[op] += 1;
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if (op_level < 2)
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return;
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if (false && op == oc_mutex_destroy)
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{
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wsrep::log_info() << "thread: " << std::this_thread::get_id()
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<< " object: " << obj
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<< ": name: " << get_key_name(key)
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<< " op: " << ti_opstring(op);
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}
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std::lock_guard<std::mutex> lock(*ops_map_sync[get_key_index(key)]);
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ops_map[get_key_index(key)][op] += 1;
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}
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struct thread_args
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{
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void* this_thread;
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void* (*fn)(void*);
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void* args;
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};
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pthread_key_t this_thread_key;
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struct this_thread_key_initializer
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{
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this_thread_key_initializer()
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{
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pthread_key_create(&this_thread_key, nullptr);
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}
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~this_thread_key_initializer()
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{
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pthread_key_delete(this_thread_key);
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}
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};
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class ti_thread : public ti_obj
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{
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public:
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ti_thread(const wsrep::thread_service::thread_key* key)
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: key_(key)
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, th_()
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, retval_()
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, detached_()
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{
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update_ops(this, key_, oc_thread_create);
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}
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~ti_thread()
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{
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update_ops(this, key_, oc_thread_destroy);
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}
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ti_thread(const ti_thread&) = delete;
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ti_thread& operator=(const ti_thread&) = delete;
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int run(void* (*fn)(void *), void* args)
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{
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auto ta(new thread_args{this, fn, args});
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return pthread_create(&th_, nullptr, start_thread, ta);
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}
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int detach()
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{
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detached_ = true;
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return pthread_detach(th_);
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}
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int join(void** retval)
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{
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return pthread_join(th_, retval);
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}
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bool detached() const { return detached_; }
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void retval(void* retval) { retval_ = retval; }
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static ti_thread* self()
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{
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return reinterpret_cast<ti_thread*>(
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pthread_getspecific(this_thread_key));
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}
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int setschedparam(int policy, const struct sched_param* param)
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{
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return pthread_setschedparam(th_, policy, param);
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}
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int getschedparam(int* policy, struct sched_param* param)
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{
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return pthread_getschedparam(th_, policy, param);
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}
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int equal(ti_thread* other)
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{
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return pthread_equal(th_, other->th_);
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}
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private:
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const wsrep::thread_service::thread_key* key_;
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pthread_t th_;
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void* retval_;
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bool detached_;
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};
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class ti_mutex : public ti_obj
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{
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public:
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ti_mutex(const wsrep::thread_service::mutex_key* key, bool inplace)
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: mutex_(PTHREAD_MUTEX_INITIALIZER)
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, key_(key)
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, inplace_(inplace)
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#ifndef NDEBUG
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, locked_()
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, owner_()
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#endif // ! NDEBUG
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{
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update_ops(this, key_, oc_mutex_create);
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if (not inplace) total_allocations++;
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}
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~ti_mutex() { update_ops(this, key_, oc_mutex_destroy); }
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ti_mutex& operator=(const ti_mutex&) = delete;
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ti_mutex(const ti_mutex&) = delete;
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int lock()
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{
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update_ops(this, key_, oc_mutex_lock);
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int ret(pthread_mutex_trylock(&mutex_));
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if (ret == EBUSY)
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{
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mutex_contention++;
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{
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std::lock_guard<std::mutex> lock(*ops_map_sync[get_key_index(key_)]);
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mutex_contention_counts[get_key_name(key_)] += 1;
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}
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ret = pthread_mutex_lock(&mutex_);
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}
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#ifndef NDEBUG
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if (ret == 0)
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{
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assert(owner_ == std::thread::id());
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locked_ = true;
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owner_ = std::this_thread::get_id();
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}
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#endif // ! NDEBUG
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return ret;
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}
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int trylock()
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{
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update_ops(this, key_, oc_mutex_trylock);
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int ret(pthread_mutex_trylock(&mutex_));
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#ifndef NDEBUG
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if (ret == 0)
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{
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assert(owner_ == std::thread::id());
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locked_ = true;
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owner_ = std::this_thread::get_id();
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}
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#endif // ! NDEBUG
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return ret;
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}
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int unlock()
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{
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assert(locked_);
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#ifndef NDEBUG
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assert(owner_ == std::this_thread::get_id());
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owner_ = std::thread::id();
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#endif // ! NDEBUG
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// Use temporary object. After mutex is unlocked it may be
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// destroyed before this update_ops() finishes.
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auto key(key_);
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int ret(pthread_mutex_unlock(&mutex_));
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update_ops(this, key, oc_mutex_unlock);
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return ret;
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}
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struct condwait_context
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{
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#ifndef NDEBUG
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bool locked;
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std::thread::id owner;
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#endif // ! NDEBUG
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};
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condwait_context save_for_condwait()
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{
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#ifndef NDEBUG
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return condwait_context{ locked_, owner_ };
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#else
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return condwait_context{};
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#endif // ! NDEBUG
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}
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void reset()
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{
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#ifndef NDEBUG
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locked_ = false;
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owner_ = std::thread::id();
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#endif // ! NDEBUG
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}
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void restore_from_condwait(const condwait_context& ctx WSREP_UNUSED)
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{
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#ifndef NDEBUG
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locked_ = ctx.locked;
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owner_ = ctx.owner;
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#endif // ! NDEBUG
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}
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pthread_mutex_t* native_handle() { return &mutex_; }
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const wsrep::thread_service::mutex_key* key() const { return key_; }
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bool inplace() const { return inplace_; }
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private:
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pthread_mutex_t mutex_;
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const wsrep::thread_service::mutex_key* key_;
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const bool inplace_;
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#ifndef NDEBUG
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bool locked_;
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std::atomic<std::thread::id> owner_;
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#endif // ! NDEBU
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};
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class ti_cond : public ti_obj
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{
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public:
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ti_cond(const wsrep::thread_service::cond_key* key, bool inplace)
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: cond_(PTHREAD_COND_INITIALIZER)
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, key_(key)
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, inplace_(inplace)
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, waiter_()
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{
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update_ops(this, key_, oc_cond_create);
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if (not inplace) total_allocations++;
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}
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~ti_cond() { update_ops(this, key_, oc_cond_destroy); }
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ti_cond& operator=(const ti_cond&) = delete;
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ti_cond(const ti_cond&) = delete;
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int wait(ti_mutex& mutex)
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{
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cond_check(pthread_mutex_trylock(mutex.native_handle()),
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get_key_name(key_), "Mutex not locked in cond wait");
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waiter_ = true;
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update_ops(this, key_, oc_cond_wait);
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// update_ops(&mutex, mutex.key(), oc_mutex_unlock);
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auto condwait_ctx(mutex.save_for_condwait());
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mutex.reset();
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int ret(pthread_cond_wait(&cond_, mutex.native_handle()));
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// update_ops(&mutex, mutex.key(), oc_mutex_lock);
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mutex.restore_from_condwait(condwait_ctx);
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waiter_ = false;
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return ret;
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}
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int timedwait(ti_mutex& mutex, const struct timespec* ts)
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{
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cond_check(pthread_mutex_trylock(mutex.native_handle()),
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get_key_name(key_), "Mutex not locked in cond wait");
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waiter_ = true;
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update_ops(this, key_, oc_cond_timedwait);
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// update_ops(&mutex, mutex.key(), oc_mutex_unlock);
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auto condwait_ctx(mutex.save_for_condwait());
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mutex.reset();
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int ret(pthread_cond_timedwait(&cond_, mutex.native_handle(), ts));
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// update_ops(&mutex, mutex.key(), oc_mutex_lock);
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mutex.restore_from_condwait(condwait_ctx);
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waiter_ = false;
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return ret;
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}
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int signal()
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{
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update_ops(this, key_, oc_cond_signal);
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cond_check(waiter_, get_key_name(key_),
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"Signalling condition variable without waiter");
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return pthread_cond_signal(&cond_);
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}
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int broadcast()
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{
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update_ops(this, key_, oc_cond_broadcast);
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return pthread_cond_broadcast(&cond_);
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}
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bool inplace() const { return inplace_; }
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private:
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pthread_cond_t cond_;
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const wsrep::thread_service::cond_key* key_;
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const bool inplace_;
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bool waiter_;
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};
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}
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int db::ti::before_init()
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{
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wsrep::log_info() << "db::ti::before_init()";
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return 0;
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}
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int db::ti::after_init()
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{
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wsrep::log_info() << "db::ti::after_init()";
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return 0;
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}
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//////////////////////////////////////////////////////////////////////////////
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// Thread //
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//////////////////////////////////////////////////////////////////////////////
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extern "C"
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{
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static void* start_thread(void* args_ptr)
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{
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thread_args* ta(reinterpret_cast<thread_args*>(args_ptr));
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ti_thread* thread = reinterpret_cast<ti_thread*>(ta->this_thread);
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pthread_setspecific(this_thread_key, thread);
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void* (*fn)(void*) = ta->fn;
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void* args = ta->args;
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delete ta;
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void* ret = (*fn)(args);
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pthread_setspecific(this_thread_key, nullptr);
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// If we end here the thread returned instead of calling
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// pthread_exit()
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if (thread->detached())
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delete thread;
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return ret;
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}
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WSREP_NORETURN
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static void exit_thread(wsrep::thread_service::thread* thread, void* retval)
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{
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pthread_setspecific(this_thread_key, nullptr);
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ti_thread* th(reinterpret_cast<ti_thread*>(thread));
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th->retval(retval);
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if (th->detached())
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delete th;
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pthread_exit(retval);
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}
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} // extern "C"
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db::ti::ti()
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{
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thread_service::exit = exit_thread;
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}
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const wsrep::thread_service::thread_key*
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db::ti::create_thread_key(const char* name) WSREP_NOEXCEPT
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{
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assert(name);
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return reinterpret_cast<const wsrep::thread_service::thread_key*>(
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append_key(name, "thread"));
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}
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int db::ti::create_thread(const wsrep::thread_service::thread_key* key,
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wsrep::thread_service::thread** thread,
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void* (*fn)(void*), void* args) WSREP_NOEXCEPT
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{
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auto pit(new ti_thread(key));
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total_allocations++;
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int ret;
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if ((ret = pit->run(fn, args)))
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{
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delete pit;
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}
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else
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{
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*thread = reinterpret_cast<wsrep::thread_service::thread*>(pit);
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}
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return ret;
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}
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int db::ti::detach(wsrep::thread_service::thread* thread) WSREP_NOEXCEPT
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{
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return reinterpret_cast<ti_thread*>(thread)->detach();
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}
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int db::ti::equal(wsrep::thread_service::thread* thread_1,
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wsrep::thread_service::thread* thread_2) WSREP_NOEXCEPT
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{
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return (reinterpret_cast<ti_thread*>(thread_1)->equal(
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reinterpret_cast<ti_thread*>(thread_2)));
|
|
}
|
|
|
|
int db::ti::join(wsrep::thread_service::thread* thread, void** retval) WSREP_NOEXCEPT
|
|
{
|
|
ti_thread* th(reinterpret_cast<ti_thread*>(thread));
|
|
int ret(th->join(retval));
|
|
if (not th->detached())
|
|
{
|
|
delete th;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
wsrep::thread_service::thread* db::ti::self() WSREP_NOEXCEPT
|
|
{
|
|
return reinterpret_cast<wsrep::thread_service::thread*>(ti_thread::self());
|
|
}
|
|
|
|
int db::ti::setschedparam(wsrep::thread_service::thread* thread,
|
|
int policy, const struct sched_param* param) WSREP_NOEXCEPT
|
|
{
|
|
return reinterpret_cast<ti_thread*>(thread)->setschedparam(policy, param);
|
|
}
|
|
|
|
int db::ti::getschedparam(wsrep::thread_service::thread* thread,
|
|
int* policy, struct sched_param* param) WSREP_NOEXCEPT
|
|
{
|
|
return reinterpret_cast<ti_thread*>(thread)->getschedparam(policy, param);
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
// Mutex //
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
const wsrep::thread_service::mutex_key*
|
|
db::ti::create_mutex_key(const char* name) WSREP_NOEXCEPT
|
|
{
|
|
assert(name);
|
|
return reinterpret_cast<const wsrep::thread_service::mutex_key*>(
|
|
append_key(name, "mutex"));
|
|
}
|
|
|
|
wsrep::thread_service::mutex*
|
|
db::ti::init_mutex(const wsrep::thread_service::mutex_key* key, void* memblock,
|
|
size_t memblock_size) WSREP_NOEXCEPT
|
|
{
|
|
return reinterpret_cast<wsrep::thread_service::mutex*>(
|
|
memblock_size >= sizeof(ti_mutex) ? new (memblock) ti_mutex(key, true)
|
|
: new ti_mutex(key, false));
|
|
}
|
|
|
|
int db::ti::destroy(wsrep::thread_service::mutex* mutex) WSREP_NOEXCEPT
|
|
{
|
|
ti_mutex* m(reinterpret_cast<ti_mutex*>(mutex));
|
|
if (m->inplace())
|
|
{
|
|
m->~ti_mutex();
|
|
}
|
|
else
|
|
{
|
|
delete m;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int db::ti::lock(wsrep::thread_service::mutex* mutex) WSREP_NOEXCEPT
|
|
{
|
|
return reinterpret_cast<ti_mutex*>(mutex)->lock();
|
|
}
|
|
|
|
int db::ti::trylock(wsrep::thread_service::mutex* mutex) WSREP_NOEXCEPT
|
|
{
|
|
return reinterpret_cast<ti_mutex*>(mutex)->trylock();
|
|
}
|
|
|
|
int db::ti::unlock(wsrep::thread_service::mutex* mutex) WSREP_NOEXCEPT
|
|
{
|
|
return reinterpret_cast<ti_mutex*>(mutex)->unlock();
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
// Cond //
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
const wsrep::thread_service::cond_key* db::ti::create_cond_key(const char* name) WSREP_NOEXCEPT
|
|
{
|
|
assert(name);
|
|
return reinterpret_cast<const wsrep::thread_service::cond_key*>(
|
|
append_key(name, "cond"));
|
|
}
|
|
|
|
wsrep::thread_service::cond*
|
|
db::ti::init_cond(const wsrep::thread_service::cond_key* key, void* memblock,
|
|
size_t memblock_size) WSREP_NOEXCEPT
|
|
{
|
|
return reinterpret_cast<wsrep::thread_service::cond*>(
|
|
memblock_size >= sizeof(ti_cond) ? new (memblock) ti_cond(key, true)
|
|
: new ti_cond(key, false));
|
|
}
|
|
|
|
int db::ti::destroy(wsrep::thread_service::cond* cond) WSREP_NOEXCEPT
|
|
{
|
|
ti_cond* c(reinterpret_cast<ti_cond*>(cond));
|
|
if (c->inplace())
|
|
{
|
|
c->~ti_cond();
|
|
}
|
|
else
|
|
{
|
|
delete c;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int db::ti::wait(wsrep::thread_service::cond* cond,
|
|
wsrep::thread_service::mutex* mutex) WSREP_NOEXCEPT
|
|
{
|
|
return reinterpret_cast<ti_cond*>(cond)->wait(
|
|
*reinterpret_cast<ti_mutex*>(mutex));
|
|
}
|
|
|
|
int db::ti::timedwait(wsrep::thread_service::cond* cond,
|
|
wsrep::thread_service::mutex* mutex,
|
|
const struct timespec* ts) WSREP_NOEXCEPT
|
|
{
|
|
return reinterpret_cast<ti_cond*>(cond)->timedwait(
|
|
*reinterpret_cast<ti_mutex*>(mutex), ts);
|
|
}
|
|
|
|
int db::ti::signal(wsrep::thread_service::cond* cond) WSREP_NOEXCEPT
|
|
{
|
|
return reinterpret_cast<ti_cond*>(cond)->signal();
|
|
}
|
|
|
|
int db::ti::broadcast(wsrep::thread_service::cond* cond) WSREP_NOEXCEPT
|
|
{
|
|
return reinterpret_cast<ti_cond*>(cond)->broadcast();
|
|
}
|
|
|
|
void db::ti::level(int level)
|
|
{
|
|
::op_level = level;
|
|
}
|
|
|
|
void db::ti::cond_checks(bool cond_checks)
|
|
{
|
|
if (cond_checks)
|
|
wsrep::log_info() << "Enabling condition variable checking";
|
|
::cond_checks = cond_checks;
|
|
}
|
|
|
|
std::string db::ti::stats()
|
|
{
|
|
std::ostringstream os;
|
|
os << "Totals:\n";
|
|
for (size_t i(0); i < total_ops.size(); ++i)
|
|
{
|
|
if (total_ops[i] > 0)
|
|
{
|
|
os << " " << ti_opstring(static_cast<enum ti_opcode>(i)) << ": "
|
|
<< total_ops[i] << "\n";
|
|
}
|
|
}
|
|
os << "Total allocations: " << total_allocations << "\n";
|
|
os << "Mutex contention: " << mutex_contention << "\n";
|
|
for (auto i : mutex_contention_counts)
|
|
{
|
|
os << " " << i.first << ": " << i.second << "\n";
|
|
}
|
|
os << "Per key:\n";
|
|
std::map<std::string, std::vector<size_t>> sorted;
|
|
for (size_t i(0); i < ops_map.size(); ++i)
|
|
{
|
|
sorted.insert(std::make_pair(get_key_name_by_index(i), ops_map[i]));
|
|
}
|
|
for (auto i : sorted)
|
|
{
|
|
for (size_t j(0); j < i.second.size(); ++j)
|
|
{
|
|
if (i.second[j])
|
|
{
|
|
os << " " << i.first << ": "
|
|
<< ti_opstring(static_cast<enum ti_opcode>(j)) << ": "
|
|
<< i.second[j] << "\n";
|
|
}
|
|
}
|
|
}
|
|
return os.str();
|
|
}
|