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/*
* create.c
*
* Description:
* This translation unit implements routines associated with spawning a new
* thread.
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright (C) 1998
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA
*/
#include "pthread.h"
#include "implement.h"
int
pthread_create (pthread_t * tid,
const pthread_attr_t * attr,
void *(*start) (void *),
void *arg)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function creates a thread running the start function,
* passing it the parameter value, 'arg'.
*
* PARAMETERS
* tid
* pointer to an instance of pthread_t
*
* attr
* optional pointer to an instance of pthread_attr_t
*
* start
* pointer to the starting routine for the new thread
*
* arg
* optional parameter passed to 'start'
*
*
* DESCRIPTION
* This function creates a thread running the start function,
* passing it the parameter value, 'arg'. The 'attr'
* argument specifies optional creation attributes.
* The thread is identity of the new thread is returned
* as 'tid'
*
* RESULTS
* 0 successfully created thread,
* EINVAL attr invalid,
* EAGAIN insufficient resources.
*
* ------------------------------------------------------
*/
{
pthread_t thread;
HANDLE threadH = 0;
int result = EAGAIN;
int run = TRUE;
ThreadParms *parms = NULL;
long stackSize;
if ((thread = ptw32_new()) == NULL)
{
goto FAIL0;
}
thread->cancelEvent =
CreateEvent (
0,
(int) TRUE, /* manualReset */
(int) FALSE, /* setSignaled */
NULL);
if (thread->cancelEvent == NULL)
{
goto FAIL0;
}
if ((parms = (ThreadParms *) malloc (sizeof (*parms))) == NULL)
{
goto FAIL0;
}
parms->tid = thread;
parms->start = start;
parms->arg = arg;
if (attr != NULL && *attr != NULL)
{
stackSize = (*attr)->stacksize;
thread->detachState = (*attr)->detachstate;
#if HAVE_SIGSET_T
thread->sigmask = (*attr)->sigmask;
#endif /* HAVE_SIGSET_T */
}
else
{
/*
* Default stackSize
*/
stackSize = PTHREAD_STACK_MIN;
}
thread->state = run
? PThreadStateInitial
: PThreadStateSuspended;
thread->keys = NULL;
/*
* Threads must be started in suspended mode and resumed if necessary
* after _beginthreadex returns us the handle. Otherwise we set up a
* race condition between the creating and the created threads.
* Note that we also retain a local copy of the handle for use
* by us in case thread->threadH gets NULLed later but before we've
* finished with it here.
*/
#if ! defined (__MINGW32__) || defined (__MSVCRT__)
thread->threadH = threadH = (HANDLE)
_beginthreadex (
(void *) NULL, /* No security info */
(unsigned) stackSize, /* default stack size */
(unsigned (PT_STDCALL *) (void *)) ptw32_threadStart,
parms,
(unsigned) CREATE_SUSPENDED,
(unsigned *) &(thread->thread));
if (threadH != 0 && run)
{
ResumeThread(threadH);
}
#else /* __MINGW32__ && ! __MSVCRT__ */
/*
* This lock will force pthread_threadStart() to wait until we have
* the thread handle.
*/
InitializeCriticalSection(&thread->cancelLock);
EnterCriticalSection(&thread->cancelLock);
thread->threadH = threadH = (HANDLE)
_beginthread (
(void (PT_STDCALL *) (void *)) ptw32_hreadStart,
(unsigned) stackSize, /* default stack size */
parms);
/*
* Make the return code match _beginthreadex's.
*/
if (threadH == (HANDLE) -1L)
{
thread->threadH = threadH = 0;
}
else if (! run)
{
/*
* beginthread does not allow for create flags, so we do it now.
* Note that beginthread itself creates the thread in SUSPENDED
* mode, and then calls ResumeThread to start it.
*/
SuspendThread (threadH);
}
LeaveCriticalSection(&thread->cancelLock);
#endif /* __MINGW32__ && ! __MSVCRT__ */
result = (threadH != 0) ? 0 : EAGAIN;
/*
* Fall Through Intentionally
*/
/*
* ------------
* Failure Code
* ------------
*/
FAIL0:
if (result != 0)
{
ptw32_threadDestroy (thread);
thread = NULL;
if (parms != NULL)
{
free (parms);
}
}
*tid = thread;
return (result);
} /* pthread_create */

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