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/* Copyright (C) 2003 MySQL AB
This program is free software; you can redistribute it and/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 02110-1301, USA */
#ifndef NDB_THREAD_HPP
#define NDB_THREAD_HPP
#include <NdbMutex.h>
#include <NdbCondition.h>
#include <NdbThread.h>
// NDBT_Thread ctor -> NDBT_Thread_run -> thr.run()
extern "C" {
static void* NDBT_Thread_run(void* arg);
}
// Function to run in a thread.
typedef void NDBT_ThreadFunc(class NDBT_Thread&);
/*
* NDBT_Thread
*
* Represents a thread. The thread pauses at startup.
* Main process sets a function to run. When the function
* returns, the thread pauses again to wait for a command.
* This allows main process to sync with the thread and
* exchange data with it.
*
* Input to thread is typically options. The input area
* is read-only in the thread. Output from thread is
* results such as statistics. Error code is handled
* separately.
*
* Pointer to Ndb object and method to create it are
* provided for convenience.
*/
class NDBT_ThreadSet;
class NDBT_Thread {
public:
NDBT_Thread();
NDBT_Thread(NDBT_ThreadSet* thread_set, int thread_no);
void create(NDBT_ThreadSet* thread_set, int thread_no);
~NDBT_Thread();
// if part of a set
inline NDBT_ThreadSet& get_thread_set() const {
assert(m_thread_set != 0);
return *m_thread_set;
}
inline int get_thread_no() const {
return m_thread_no;
}
// { Wait -> Start -> Stop }+ -> Exit
enum State {
Wait = 1, // wait for command
Start, // run current function
Stop, // stopped (paused) when current function done
Exit // exit thread
};
// tell thread to start running current function
void start();
// wait for thread to stop when function is done
void stop();
// tell thread to exit
void exit();
// collect thread after exit
void join();
// set function to run
inline void set_func(NDBT_ThreadFunc* func) {
m_func = func;
}
// input area
inline void set_input(const void* input) {
m_input = input;
}
inline const void* get_input() const {
return m_input;
}
// output area
inline void set_output(void* output) {
m_output = output;
}
inline void* get_output() const {
return m_output;
}
template <class T> inline void set_output() {
set_output(new T);
}
inline void delete_output() {
delete m_output;
m_output = 0;
}
// thread-specific Ndb object
inline class Ndb* get_ndb() const {
return m_ndb;
}
int connect(class Ndb_cluster_connection*, const char* db = "TEST_DB");
void disconnect();
// error code (OS, Ndb, other)
void clear_err() {
m_err = 0;
}
void set_err(int err) {
m_err = err;
}
int get_err() const {
return m_err;
}
private:
friend class NDBT_ThreadSet;
friend void* NDBT_Thread_run(void* arg);
enum { Magic = 0xabacadae };
Uint32 m_magic;
State m_state;
NDBT_ThreadSet* m_thread_set;
int m_thread_no;
NDBT_ThreadFunc* m_func;
const void* m_input;
void* m_output;
class Ndb* m_ndb;
int m_err;
// run the thread
void run();
void lock() {
NdbMutex_Lock(m_mutex);
}
void unlock() {
NdbMutex_Unlock(m_mutex);
}
void wait() {
NdbCondition_Wait(m_cond, m_mutex);
}
void signal() {
NdbCondition_Signal(m_cond);
}
NdbMutex* m_mutex;
NdbCondition* m_cond;
NdbThread* m_thread;
void* m_status;
};
/*
* A set of threads, indexed from 0 to count-1. Methods
* are applied to each thread (serially). Input area is
* common to all threads. Output areas are allocated
* separately according to a template class.
*/
class NDBT_ThreadSet {
public:
NDBT_ThreadSet(int count);
~NDBT_ThreadSet();
inline int get_count() const {
return m_count;
}
inline NDBT_Thread& get_thread(int n) {
assert(n < m_count && m_thread[n] != 0);
return *m_thread[n];
}
// tell each thread to start running
void start();
// wait for each thread to stop
void stop();
// tell each thread to exit
void exit();
// collect each thread after exit
void join();
// set function to run in each thread
void set_func(NDBT_ThreadFunc* func);
// set input area (same instance in each thread)
void set_input(const void* input);
// set output areas
template <class T> inline void set_output() {
for (int n = 0; n < m_count; n++) {
NDBT_Thread& thr = *m_thread[n];
thr.set_output<T>();
}
}
void delete_output();
// thread-specific Ndb objects
int connect(class Ndb_cluster_connection*, const char* db = "TEST_DB");
void disconnect();
int get_err() const;
private:
int m_count;
NDBT_Thread** m_thread;
};
#endif
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