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/* Copyright (c) 2000, 2016, 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 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 St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "my_thread.h"
#ifdef _WIN32
#include "my_sys.h" /* my_osmaperr */
#include <process.h>
#include <signal.h>
struct thread_start_parameter
{
my_start_routine func;
void *arg;
};
static unsigned int __stdcall win_thread_start(void *p)
{
struct thread_start_parameter *par= (struct thread_start_parameter *)p;
my_start_routine func= par->func;
void *arg= par->arg;
free(p);
(*func)(arg);
return 0;
}
#endif
/*
One time initialization. For simplicity, we assume initializer thread
does not exit within init_routine().
*/
int my_thread_once(my_thread_once_t *once_control, void (*init_routine)(void))
{
#ifndef _WIN32
return pthread_once(once_control, init_routine);
#else
LONG state;
/*
Do "dirty" read to find out if initialization is already done, to
save an interlocked operation in common case. Memory barriers are ensured by
Visual C++ volatile implementation.
*/
if (*once_control == MY_THREAD_ONCE_DONE)
return 0;
state= InterlockedCompareExchange(once_control, MY_THREAD_ONCE_INPROGRESS,
MY_THREAD_ONCE_INIT);
switch(state)
{
case MY_THREAD_ONCE_INIT:
/* This is initializer thread */
(*init_routine)();
*once_control= MY_THREAD_ONCE_DONE;
break;
case MY_THREAD_ONCE_INPROGRESS:
/* init_routine in progress. Wait for its completion */
while(*once_control == MY_THREAD_ONCE_INPROGRESS)
{
Sleep(1);
}
break;
case MY_THREAD_ONCE_DONE:
/* Nothing to do */
break;
}
return 0;
#endif /* _WIN32 */
}
int my_thread_create(my_thread_handle *thread, const my_thread_attr_t *attr,
my_start_routine func, void *arg)
{
#ifndef _WIN32
return pthread_create(&thread->thread, attr, func, arg);
#else
struct thread_start_parameter *par;
unsigned int stack_size;
par= (struct thread_start_parameter *)malloc(sizeof(*par));
if (!par)
goto error_return;
par->func= func;
par->arg= arg;
stack_size= attr ? attr->dwStackSize : 0;
thread->handle= (HANDLE)_beginthreadex(NULL, stack_size, win_thread_start,
par, 0, &thread->thread);
if (thread->handle)
{
/* Note that JOINABLE is default, so attr == NULL => JOINABLE. */
if (attr && attr->detachstate == MY_THREAD_CREATE_DETACHED)
{
/*
Close handles for detached threads right away to avoid leaking
handles. For joinable threads we need the handle during
my_thread_join. It will be closed there.
*/
CloseHandle(thread->handle);
thread->handle= NULL;
}
return 0;
}
my_osmaperr(GetLastError());
free(par);
error_return:
thread->thread= 0;
thread->handle= NULL;
return 1;
#endif
}
int my_thread_join(my_thread_handle *thread, void **value_ptr)
{
#ifndef _WIN32
return pthread_join(thread->thread, value_ptr);
#else
DWORD ret;
int result= 0;
ret= WaitForSingleObject(thread->handle, INFINITE);
if (ret != WAIT_OBJECT_0)
{
my_osmaperr(GetLastError());
result= 1;
}
if (thread->handle)
CloseHandle(thread->handle);
thread->thread= 0;
thread->handle= NULL;
return result;
#endif
}
int my_thread_cancel(my_thread_handle *thread)
{
#ifndef _WIN32
return pthread_cancel(thread->thread);
#else
BOOL ok= FALSE;
if (thread->handle)
{
ok= TerminateThread(thread->handle, 0);
CloseHandle(thread->handle);
}
if (ok)
return 0;
errno= EINVAL;
return -1;
#endif
}
void my_thread_exit(void *value_ptr)
{
#ifndef _WIN32
pthread_exit(value_ptr);
#else
_endthreadex(0);
#endif
}
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