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Diffstat (limited to '')
| -rw-r--r-- | sql/threadpool_generic.h | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/sql/threadpool_generic.h b/sql/threadpool_generic.h new file mode 100644 index 00000000..acf5ec69 --- /dev/null +++ b/sql/threadpool_generic.h @@ -0,0 +1,156 @@ +/* Copyright(C) 2019, 2020, MariaDB + * + * This program is free software; you can redistribute itand /or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * 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 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 Street, Fifth Floor, Boston, MA 02111 - 1301 USA*/ + +#if defined (HAVE_POOL_OF_THREADS) +#include <my_global.h> +#include <sql_plist.h> +#include <my_pthread.h> +#include <mysqld.h> +#include <threadpool.h> +#include <violite.h> + +#ifdef _WIN32 +#include <windows.h> +/* AIX may define this, too ?*/ +#define HAVE_IOCP +#endif + + +#ifdef _WIN32 +typedef HANDLE TP_file_handle; +#else +typedef int TP_file_handle; +#define INVALID_HANDLE_VALUE -1 +#endif + +#ifdef __linux__ +#include <sys/epoll.h> +typedef struct epoll_event native_event; +#elif defined(HAVE_KQUEUE) +#include <sys/event.h> +typedef struct kevent native_event; +#elif defined (__sun) +#include <port.h> +typedef port_event_t native_event; +#elif defined (HAVE_IOCP) +typedef OVERLAPPED_ENTRY native_event; +#else +#error threadpool is not available on this platform +#endif + +struct thread_group_t; + +/* Per-thread structure for workers */ +struct worker_thread_t +{ + ulonglong event_count; /* number of request handled by this thread */ + thread_group_t* thread_group; + worker_thread_t* next_in_list; + worker_thread_t** prev_in_list; + mysql_cond_t cond; + bool woken; +}; + +typedef I_P_List<worker_thread_t, I_P_List_adapter<worker_thread_t, + & worker_thread_t::next_in_list, + & worker_thread_t::prev_in_list>, + I_P_List_counter +> +worker_list_t; + +struct TP_connection_generic :public TP_connection +{ + TP_connection_generic(CONNECT* c); + ~TP_connection_generic(); + + virtual int init() { return 0; }; + virtual void set_io_timeout(int sec); + virtual int start_io(); + virtual void wait_begin(int type); + virtual void wait_end(); + + thread_group_t* thread_group; + TP_connection_generic* next_in_queue; + TP_connection_generic** prev_in_queue; + ulonglong abs_wait_timeout; + ulonglong enqueue_time; + TP_file_handle fd; + bool bound_to_poll_descriptor; + int waiting; + bool fix_group; +#ifdef HAVE_IOCP + OVERLAPPED overlapped; +#endif +#ifdef _WIN32 + enum_vio_type vio_type; +#endif +}; + + +typedef I_P_List<TP_connection_generic, + I_P_List_adapter<TP_connection_generic, + & TP_connection_generic::next_in_queue, + & TP_connection_generic::prev_in_queue>, + I_P_List_counter, + I_P_List_fast_push_back<TP_connection_generic> > + connection_queue_t; + +const int NQUEUES = 2; /* We have high and low priority queues*/ + +enum class operation_origin +{ + WORKER, + LISTENER +}; + +struct thread_group_counters_t +{ + ulonglong thread_creations; + ulonglong thread_creations_due_to_stall; + ulonglong wakes; + ulonglong wakes_due_to_stall; + ulonglong throttles; + ulonglong stalls; + ulonglong dequeues[2]; + ulonglong polls[2]; +}; + +struct thread_group_t +{ + mysql_mutex_t mutex; + connection_queue_t queues[NQUEUES]; + worker_list_t waiting_threads; + worker_thread_t* listener; + pthread_attr_t* pthread_attr; + TP_file_handle pollfd; + int thread_count; + int active_thread_count; + int connection_count; + /* Stats for the deadlock detection timer routine.*/ + int io_event_count; + int queue_event_count; + ulonglong last_thread_creation_time; + int shutdown_pipe[2]; + bool shutdown; + bool stalled; + thread_group_counters_t counters; + char pad[CPU_LEVEL1_DCACHE_LINESIZE]; +}; + +#define TP_INCREMENT_GROUP_COUNTER(group,var) do {group->counters.var++;}while(0) + +extern thread_group_t* all_groups; +#endif + |