308 lines
7.9 KiB
C
308 lines
7.9 KiB
C
/*
|
|
* create.c
|
|
*
|
|
* Description:
|
|
* This translation unit implements routines associated with spawning a new
|
|
* thread.
|
|
*
|
|
* --------------------------------------------------------------------------
|
|
*
|
|
* Pthreads-win32 - POSIX Threads Library for Win32
|
|
* Copyright(C) 1998 John E. Bossom
|
|
* Copyright(C) 1999,2005 Pthreads-win32 contributors
|
|
*
|
|
* Contact Email: rpj@callisto.canberra.edu.au
|
|
*
|
|
* The current list of contributors is contained
|
|
* in the file CONTRIBUTORS included with the source
|
|
* code distribution. The list can also be seen at the
|
|
* following World Wide Web location:
|
|
* http://sources.redhat.com/pthreads-win32/contributors.html
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library in the file COPYING.LIB;
|
|
* if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
|
|
*/
|
|
|
|
#include "pthread.h"
|
|
#include "implement.h"
|
|
#if ! defined(_UWIN) && ! defined(WINCE)
|
|
#include <process.h>
|
|
#endif
|
|
|
|
int
|
|
pthread_create (pthread_t * tid,
|
|
const pthread_attr_t * attr,
|
|
void *(PTW32_CDECL *start) (void *), void *arg)
|
|
/*
|
|
* ------------------------------------------------------
|
|
* DOCPUBLIC
|
|
* This function creates a thread running the start function,
|
|
* passing it the parameter value, 'arg'. The 'attr'
|
|
* argument specifies optional creation attributes.
|
|
* The identity of the new thread is returned
|
|
* via 'tid', which should not be NULL.
|
|
*
|
|
* 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 identity of the new thread is returned
|
|
* via 'tid', which should not be the NULL pointer.
|
|
*
|
|
* RESULTS
|
|
* 0 successfully created thread,
|
|
* EINVAL attr invalid,
|
|
* EAGAIN insufficient resources.
|
|
*
|
|
* ------------------------------------------------------
|
|
*/
|
|
{
|
|
pthread_t thread;
|
|
ptw32_thread_t * tp;
|
|
register pthread_attr_t a;
|
|
HANDLE threadH = 0;
|
|
int result = EAGAIN;
|
|
int run = PTW32_TRUE;
|
|
ThreadParms *parms = NULL;
|
|
unsigned int stackSize;
|
|
int priority;
|
|
pthread_t self;
|
|
|
|
/*
|
|
* Before doing anything, check that tid can be stored through
|
|
* without invoking a memory protection error (segfault).
|
|
* Make sure that the assignment below can't be optimised out by the compiler.
|
|
* This is assured by conditionally assigning *tid again at the end.
|
|
*/
|
|
tid->x = 0;
|
|
|
|
if (attr != NULL)
|
|
{
|
|
a = *attr;
|
|
}
|
|
else
|
|
{
|
|
a = NULL;
|
|
}
|
|
|
|
if ((thread = ptw32_new ()).p == NULL)
|
|
{
|
|
goto FAIL0;
|
|
}
|
|
|
|
tp = (ptw32_thread_t *) thread.p;
|
|
|
|
priority = tp->sched_priority;
|
|
|
|
if ((parms = (ThreadParms *) malloc (sizeof (*parms))) == NULL)
|
|
{
|
|
goto FAIL0;
|
|
}
|
|
|
|
parms->tid = thread;
|
|
parms->start = start;
|
|
parms->arg = arg;
|
|
|
|
#if defined(HAVE_SIGSET_T)
|
|
|
|
/*
|
|
* Threads inherit their initial sigmask from their creator thread.
|
|
*/
|
|
self = pthread_self();
|
|
tp->sigmask = ((ptw32_thread_t *)self.p)->sigmask;
|
|
|
|
#endif /* HAVE_SIGSET_T */
|
|
|
|
|
|
if (a != NULL)
|
|
{
|
|
stackSize = (unsigned int)a->stacksize;
|
|
tp->detachState = a->detachstate;
|
|
priority = a->param.sched_priority;
|
|
|
|
#if (THREAD_PRIORITY_LOWEST > THREAD_PRIORITY_NORMAL)
|
|
/* WinCE */
|
|
#else
|
|
/* Everything else */
|
|
|
|
/*
|
|
* Thread priority must be set to a valid system level
|
|
* without altering the value set by pthread_attr_setschedparam().
|
|
*/
|
|
|
|
/*
|
|
* PTHREAD_EXPLICIT_SCHED is the default because Win32 threads
|
|
* don't inherit their creator's priority. They are started with
|
|
* THREAD_PRIORITY_NORMAL (win32 value). The result of not supplying
|
|
* an 'attr' arg to pthread_create() is equivalent to defaulting to
|
|
* PTHREAD_EXPLICIT_SCHED and priority THREAD_PRIORITY_NORMAL.
|
|
*/
|
|
if (PTHREAD_INHERIT_SCHED == a->inheritsched)
|
|
{
|
|
/*
|
|
* If the thread that called pthread_create() is a Win32 thread
|
|
* then the inherited priority could be the result of a temporary
|
|
* system adjustment. This is not the case for POSIX threads.
|
|
*/
|
|
#if ! defined(HAVE_SIGSET_T)
|
|
self = pthread_self ();
|
|
#endif
|
|
priority = ((ptw32_thread_t *) self.p)->sched_priority;
|
|
}
|
|
|
|
#endif
|
|
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* Default stackSize
|
|
*/
|
|
stackSize = PTHREAD_STACK_MIN;
|
|
}
|
|
|
|
tp->state = run ? PThreadStateInitial : PThreadStateSuspended;
|
|
|
|
tp->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.p->threadH gets NULLed later but before we've
|
|
* finished with it here.
|
|
*/
|
|
|
|
#if ! (defined (__MINGW64__) || defined(__MINGW32__)) || defined (__MSVCRT__) || defined (__DMC__)
|
|
|
|
tp->threadH =
|
|
threadH =
|
|
(HANDLE) _beginthreadex ((void *) NULL, /* No security info */
|
|
stackSize, /* default stack size */
|
|
ptw32_threadStart,
|
|
parms,
|
|
(unsigned)
|
|
CREATE_SUSPENDED,
|
|
(unsigned *) &(tp->thread));
|
|
|
|
if (threadH != 0)
|
|
{
|
|
if (a != NULL)
|
|
{
|
|
(void) ptw32_setthreadpriority (thread, SCHED_OTHER, priority);
|
|
}
|
|
|
|
if (run)
|
|
{
|
|
ResumeThread (threadH);
|
|
}
|
|
}
|
|
|
|
#else
|
|
|
|
{
|
|
ptw32_mcs_local_node_t stateLock;
|
|
|
|
/*
|
|
* This lock will force pthread_threadStart() to wait until we have
|
|
* the thread handle and have set the priority.
|
|
*/
|
|
ptw32_mcs_lock_acquire(&tp->stateLock, &stateLock);
|
|
|
|
tp->threadH =
|
|
threadH =
|
|
(HANDLE) _beginthread (ptw32_threadStart, stackSize, /* default stack size */
|
|
parms);
|
|
|
|
/*
|
|
* Make the return code match _beginthreadex's.
|
|
*/
|
|
if (threadH == (HANDLE) - 1L)
|
|
{
|
|
tp->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);
|
|
}
|
|
|
|
if (a != NULL)
|
|
{
|
|
(void) ptw32_setthreadpriority (thread, SCHED_OTHER, priority);
|
|
}
|
|
}
|
|
|
|
ptw32_mcs_lock_release (&stateLock);
|
|
}
|
|
#endif
|
|
|
|
result = (threadH != 0) ? 0 : EAGAIN;
|
|
|
|
/*
|
|
* Fall Through Intentionally
|
|
*/
|
|
|
|
/*
|
|
* ------------
|
|
* Failure Code
|
|
* ------------
|
|
*/
|
|
|
|
FAIL0:
|
|
if (result != 0)
|
|
{
|
|
|
|
ptw32_threadDestroy (thread);
|
|
tp = NULL;
|
|
|
|
if (parms != NULL)
|
|
{
|
|
free (parms);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
*tid = thread;
|
|
}
|
|
|
|
#if defined(_UWIN)
|
|
if (result == 0)
|
|
pthread_count++;
|
|
#endif
|
|
return (result);
|
|
|
|
} /* pthread_create */
|