/***************************************************************************** Copyright (c) 2012, 2018, Oracle and/or its affiliates. All Rights Reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License, version 2.0, as published by the Free Software Foundation. This program is also distributed with certain software (including but not limited to OpenSSL) that is licensed under separate terms, as designated in a particular file or component or in included license documentation. The authors of MySQL hereby grant you an additional permission to link the program and your derivative works with the separately licensed software that they have included with MySQL. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0, for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA *****************************************************************************/ /** @file include/ut0mutex.h Policy based mutexes. Created 2012-03-24 Sunny Bains. ***********************************************************************/ #ifndef ut0mutex_h #define ut0mutex_h #include "my_inttypes.h" extern ulong srv_spin_wait_delay; extern ulong srv_n_spin_wait_rounds; extern ulong srv_force_recovery_crash; #ifdef UNIV_LIBRARY /* Mutexes are disabled under UNIV_LIBRARY */ #define mutex_create(I, M) (void)M #define mutex_enter(M) (void)M #define mutex_enter_nospin(M) (void)M #define mutex_enter_nowait(M) (void)M #define mutex_exit(M) (void)M #define mutex_free(M) (void)M #ifdef UNIV_DEBUG #define mutex_validate(M) (M) /* Since mutexes are disabled under UNIV_LIBRARY, the following is OK and necessary to suppress compiler warnings. */ #define mutex_own(M) ((M) || false) #endif /* UNIV_DEBUG */ typedef OSMutex SysMutex; typedef OSMutex ib_mutex_t; typedef OSMutex ib_bpmutex_t; #else /* UNIV_LIBRARY */ #include #include "ib0mutex.h" #include "os0atomic.h" #include "sync0policy.h" /** Create a typedef using the MutexType @param[in] M Mutex type @param[in] P Policy type @param[in] T The resulting typedef alias */ #define UT_MUTEX_TYPE(M, P, T) typedef PolicyMutex> T; typedef OSMutex EventMutex; #ifdef HAVE_IB_LINUX_FUTEX UT_MUTEX_TYPE(TTASFutexMutex, GenericPolicy, FutexMutex) UT_MUTEX_TYPE(TTASFutexMutex, BlockMutexPolicy, BlockFutexMutex) #endif /* HAVE_IB_LINUX_FUTEX */ UT_MUTEX_TYPE(TTASMutex, GenericPolicy, SpinMutex) UT_MUTEX_TYPE(TTASMutex, BlockMutexPolicy, BlockSpinMutex) UT_MUTEX_TYPE(OSTrackMutex, GenericPolicy, SysMutex) UT_MUTEX_TYPE(OSTrackMutex, BlockMutexPolicy, BlockSysMutex) UT_MUTEX_TYPE(TTASEventMutex, GenericPolicy, SyncArrayMutex) UT_MUTEX_TYPE(TTASEventMutex, BlockMutexPolicy, BlockSyncArrayMutex) #ifndef UNIV_HOTBACKUP #ifdef MUTEX_FUTEX /** The default mutex type. */ typedef FutexMutex ib_mutex_t; typedef BlockFutexMutex ib_bpmutex_t; #define MUTEX_TYPE "Uses futexes" #elif defined(MUTEX_SYS) typedef SysMutex ib_mutex_t; typedef BlockSysMutex ib_bpmutex_t; #define MUTEX_TYPE "Uses system mutexes" #elif defined(MUTEX_EVENT) typedef SyncArrayMutex ib_mutex_t; typedef BlockSyncArrayMutex ib_bpmutex_t; #define MUTEX_TYPE "Uses event mutexes" #else #error "ib_mutex_t type is unknown" #endif /* MUTEX_FUTEX */ #include "ut0mutex.ic" extern ulong srv_spin_wait_delay; extern ulong srv_n_spin_wait_rounds; #define mutex_create(I, M) mutex_init((M), (I), __FILE__, __LINE__) #define mutex_enter(M) \ (M)->enter(srv_n_spin_wait_rounds, srv_spin_wait_delay, __FILE__, __LINE__) #define mutex_enter_nospin(M) (M)->enter(0, 0, __FILE__, __LINE__) #define mutex_enter_nowait(M) (M)->trylock(__FILE__, __LINE__) #define mutex_exit(M) (M)->exit() #define mutex_free(M) mutex_destroy(M) /* RAII guard for ib mutex */ struct IB_mutex_guard { /** Constructor to acquire mutex @param[in] in_mutex input mutex */ explicit IB_mutex_guard(ib_mutex_t *in_mutex) : m_mutex(in_mutex) { mutex_enter(in_mutex); } /** Destructor to release mutex */ ~IB_mutex_guard() { mutex_exit(m_mutex); } /** Disable copy construction */ IB_mutex_guard(IB_mutex_guard const &) = delete; /** Disable assignment */ IB_mutex_guard &operator=(IB_mutex_guard const &) = delete; private: /** Current mutex for RAII */ ib_mutex_t *m_mutex; }; #ifdef UNIV_DEBUG /** Checks that the mutex has been initialized. */ #define mutex_validate(M) (M)->validate() /** Checks that the current thread owns the mutex. Works only in the debug version. */ #define mutex_own(M) (M)->is_owned() #else #define mutex_own(M) /* No op */ #define mutex_validate(M) /* No op */ #endif /* UNIV_DEBUG */ #else /* !UNIV_HOTBACKUP */ #include "../meb/mutex.h" typedef meb::Mutex ib_mutex_t; typedef meb::Mutex ib_bpmutex_t; #endif /* !UNIV_HOTBACKUP */ /** Iterate over the mutex meta data */ class MutexMonitor { public: /** Constructor */ MutexMonitor() {} /** Destructor */ ~MutexMonitor() {} /** Enable the mutex monitoring */ void enable(); /** Disable the mutex monitoring */ void disable(); /** Reset the mutex monitoring values */ void reset(); /** Invoke the callback for each active mutex collection @param[in,out] callback Functor to call @return false if callback returned false */ template bool iterate(Callback &callback) const UNIV_NOTHROW { LatchMetaData::iterator end = latch_meta.end(); for (LatchMetaData::iterator it = latch_meta.begin(); it != end; ++it) { /* Some of the slots will be null in non-debug mode */ if (*it == NULL) { continue; } latch_meta_t *latch_meta = *it; bool ret = callback(*latch_meta); if (!ret) { return (ret); } } return (true); } }; /** Defined in sync0sync.cc */ extern MutexMonitor *mutex_monitor; #ifndef UNIV_HOTBACKUP /** Creates, or rather, initializes a mutex object in a specified memory location (which must be appropriately aligned). The mutex is initialized in the reset state. Explicit freeing of the mutex with mutex_free is necessary only if the memory block containing it is freed. Add the mutex instance to the global mutex list. @param[in,out] mutex mutex to initialise @param[in] id The mutex ID (Latch ID) @param[in] file_name Filename from where it was called @param[in] line Line number in filename from where called */ template void mutex_init(Mutex *mutex, latch_id_t id, const char *file_name, uint32_t line) { new (mutex) Mutex(); mutex->init(id, file_name, line); } /** Removes a mutex instance from the mutex list. The mutex is checked to be in the reset state. @param[in,out] mutex mutex instance to destroy */ template void mutex_destroy(Mutex *mutex) { mutex->destroy(); } #endif /* UNIV_LIBRARY */ #endif /* !UNIV_HOTBACKUP */ #endif /* ut0mutex_h */