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Chip 2001 January
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Chip_2001-01_cd1.bin
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tema
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mysql
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mysql-3.23.28g-win-source.exe
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test1
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mysql_thr.c
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C/C++ Source or Header
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1999-10-12
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7KB
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256 lines
/* Testing of connecting to MySQL from X threads */
#include <windows.h>
#include <process.h>
#include <stdio.h>
#include <mysql.h>
#include <errno.h>
#define TEST_COUNT 20
/*****************************************************************************
** The following is to emulate the posix thread interface
*****************************************************************************/
typedef HANDLE pthread_t;
typedef struct thread_attr {
DWORD dwStackSize ;
DWORD dwCreatingFlag ;
int priority ;
} pthread_attr_t ;
typedef struct { int dummy; } pthread_condattr_t;
typedef unsigned int uint;
typedef struct {
uint waiting;
HANDLE semaphore;
} pthread_cond_t;
typedef CRITICAL_SECTION pthread_mutex_t;
#define pthread_mutex_init(A,B) InitializeCriticalSection(A)
#define pthread_mutex_lock(A) (EnterCriticalSection(A),0)
#define pthread_mutex_unlock(A) LeaveCriticalSection(A)
#define pthread_mutex_destroy(A) DeleteCriticalSection(A)
#define pthread_handler_decl(A,B) unsigned __cdecl A(void *B)
typedef unsigned (__cdecl *pthread_handler)(void *);
#define pthread_self() GetCurrentThread()
static unsigned int thread_count;
static pthread_cond_t COND_thread_count;
static pthread_mutex_t LOCK_thread_count;
pthread_mutex_t THR_LOCK_malloc,THR_LOCK_open,THR_LOCK_keycache,
THR_LOCK_lock,THR_LOCK_isam;
/*
** We have tried to use '_beginthreadex' instead of '_beginthread' here
** but in this case the program leaks about 512 characters for each
** created thread !
*/
int pthread_create(pthread_t *thread_id, pthread_attr_t *attr,
pthread_handler func, void *param)
{
HANDLE hThread;
hThread=(HANDLE)_beginthread(func,
attr->dwStackSize ? attr->dwStackSize :
65535,param);
if ((long) hThread == -1L)
{
return(errno ? errno : -1);
}
*thread_id=hThread;
return(0);
}
void pthread_exit(unsigned A)
{
_endthread();
}
/*
** The following simple implementation of conds works as long as
** only one thread uses pthread_cond_wait at a time.
** This is coded very carefully to work with thr_lock.
*/
/*****************************************************************************
** The following is a simple implementation of posix conditions
*****************************************************************************/
int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
{
cond->waiting=0;
cond->semaphore=CreateSemaphore(NULL,0,0x7FFFFFFF,(char*) 0);
if (!cond->semaphore)
return ENOMEM;
return 0;
}
int pthread_cond_destroy(pthread_cond_t *cond)
{
return CloseHandle(cond->semaphore) ? 0 : EINVAL;
}
int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
InterlockedIncrement(&cond->waiting);
LeaveCriticalSection(mutex);
WaitForSingleObject(cond->semaphore,INFINITE);
InterlockedDecrement(&cond->waiting);
EnterCriticalSection(mutex);
return 0 ;
}
int pthread_cond_signal(pthread_cond_t *cond)
{
long prev_count;
if (cond->waiting)
ReleaseSemaphore(cond->semaphore,1,&prev_count);
return 0;
}
int pthread_attr_init(pthread_attr_t *connect_att)
{
connect_att->dwStackSize = 0;
connect_att->dwCreatingFlag = 0;
connect_att->priority = 0;
return 0;
}
int pthread_attr_setstacksize(pthread_attr_t *connect_att,DWORD stack)
{
connect_att->dwStackSize=stack;
return 0;
}
int pthread_attr_setprio(pthread_attr_t *connect_att,int priority)
{
connect_att->priority=priority;
return 0;
}
int pthread_attr_destroy(pthread_attr_t *connect_att)
{
return 0;
}
/* from my_pthread.c */
#ifndef REMOVE_BUG
__declspec(thread) int THR_KEY_my_errno;
int _my_errno(void)
{
return THR_KEY_my_errno;
}
#endif
/*****************************************************************************
** The test program
*****************************************************************************/
pthread_handler_decl(test_thread,arg)
{
MYSQL mysql;
MYSQL_RES *res;
mysql_init(&mysql);
if (!mysql_real_connect(&mysql,NULL,0,0,NULL,0,NULL,0))
{
fprintf(stderr,"Couldn't connect to engine!\n%s\n\n",mysql_error(&mysql));
perror("");
goto end;
}
if (mysql_query(&mysql,"select 1") < 0)
{
fprintf(stderr,"Query failed (%s)\n",mysql_error(&mysql));
goto end;
}
if (!(res=mysql_store_result(&mysql)))
{
fprintf(stderr,"Couldn't get result from query failed\n",
mysql_error(&mysql));
goto end;
}
mysql_free_result(res);
end:
Sleep(1000); /* Win32 sleep */
mysql_close(&mysql);
pthread_mutex_lock(&LOCK_thread_count);
thread_count--;
pthread_cond_signal(&COND_thread_count); /* Tell main we are ready */
pthread_mutex_unlock(&LOCK_thread_count);
pthread_exit(0);
return 0;
}
int main(int argc,char **argv)
{
pthread_t tid;
pthread_attr_t thr_attr;
int i,error;
if ((error=pthread_cond_init(&COND_thread_count,NULL)))
{
fprintf(stderr,"Got error: %d from pthread_cond_init (errno: %d)",
error,errno);
exit(1);
}
pthread_mutex_init(&LOCK_thread_count,NULL);
if ((error=pthread_attr_init(&thr_attr)))
{
fprintf(stderr,"Got error: %d from pthread_attr_init (errno: %d)",
error,errno);
exit(1);
}
if ((error=pthread_attr_setstacksize(&thr_attr,65536L)))
{
fprintf(stderr,"Got error: %d from pthread_attr_setstacksize (errno: %d)",
error,errno);
exit(1);
}
printf("Init ok. Creating %d threads\n",TEST_COUNT);
for (i=1 ; i <= TEST_COUNT ; i++)
{
int *param= &i;
if ((error=pthread_mutex_lock(&LOCK_thread_count)))
{
fprintf(stderr,"\nGot error: %d from pthread_mutex_lock (errno: %d)",
error,errno);
exit(1);
}
if ((error=pthread_create(&tid,&thr_attr,test_thread,(void*) param)))
{
fprintf(stderr,"\nGot error: %d from pthread_create (errno: %d)\n",
error,errno);
pthread_mutex_unlock(&LOCK_thread_count);
exit(1);
}
thread_count++;
pthread_mutex_unlock(&LOCK_thread_count);
}
if ((error=pthread_mutex_lock(&LOCK_thread_count)))
fprintf(stderr,"\nGot error: %d from pthread_mutex_lock\n",error);
while (thread_count)
{
if ((error=pthread_cond_wait(&COND_thread_count,&LOCK_thread_count)))
fprintf(stderr,"\nGot error: %d from pthread_cond_wait\n",error);
}
pthread_mutex_unlock(&LOCK_thread_count);
pthread_attr_destroy(&thr_attr);
printf("\nend\n");
return 0;
}