Current File : //usr/include/mysql/server/private/threadpool_generic.h
/* 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>
#include "threadpool_winsockets.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();
int init() override { return 0; }
void set_io_timeout(int sec) override;
int start_io() override;
void wait_begin(int type) override;
void wait_end() override;
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 _WIN32
win_aiosocket win_sock{};
void init_vio(st_vio *vio) override
{ win_sock.init(vio);}
#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
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