mirror of
https://github.com/codership/wsrep-lib.git
synced 2025-10-31 06:50:26 +03:00
a5d95f0175
The thread local ti_thread object was not initialized for main thread, which caused ASAN to complain about wild pointer. Fixed by assigning a thread local ti_thread object for main thread too.
728 lines
21 KiB
C++
728 lines
21 KiB
C++
/*
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* Copyright (C) 2019-2023 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 <cstdint>
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#include <pthread.h>
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#include <algorithm>
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#include <atomic>
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#include <array>
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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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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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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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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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thread_local ti_thread* this_ti_thread = nullptr;
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static bool main_thread_initializer()
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{
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const auto* main_thread_key
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= reinterpret_cast<const wsrep::thread_service::thread_key*>(
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append_key("main", "thread"));
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static ti_thread main_thread(main_thread_key);
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this_ti_thread = &main_thread;
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return true;
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}
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static bool main_thread_init = main_thread_initializer();
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ti_thread* ti_thread::self()
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{
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return this_ti_thread;
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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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this_ti_thread = 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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this_ti_thread = 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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this_ti_thread = 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)));
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}
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int db::ti::join(wsrep::thread_service::thread* thread, void** retval) WSREP_NOEXCEPT
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{
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|
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();
|
|
}
|