309 lines
8.2 KiB
C
309 lines
8.2 KiB
C
/*
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* create.c
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*
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* Description:
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* This translation unit implements routines associated with spawning a new
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* thread.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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#if ! defined(_UWIN) && ! defined(WINCE)
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#include <process.h>
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#endif
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int
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pthread_create (pthread_t * tid,
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const pthread_attr_t * attr,
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void *(PTW32_CDECL *start) (void *), void *arg)
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/*
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* ------------------------------------------------------
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* DOCPUBLIC
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* This function creates a thread running the start function,
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* passing it the parameter value, 'arg'. The 'attr'
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* argument specifies optional creation attributes.
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* The identity of the new thread is returned
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* via 'tid', which should not be NULL.
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*
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* PARAMETERS
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* tid
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* pointer to an instance of pthread_t
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*
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* attr
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* optional pointer to an instance of pthread_attr_t
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*
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* start
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* pointer to the starting routine for the new thread
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*
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* arg
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* optional parameter passed to 'start'
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*
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*
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* DESCRIPTION
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* This function creates a thread running the start function,
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* passing it the parameter value, 'arg'. The 'attr'
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* argument specifies optional creation attributes.
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* The identity of the new thread is returned
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* via 'tid', which should not be the NULL pointer.
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*
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* RESULTS
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* 0 successfully created thread,
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* EINVAL attr invalid,
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* EAGAIN insufficient resources.
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*
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* ------------------------------------------------------
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*/
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{
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pthread_t thread;
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ptw32_thread_t * tp;
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register pthread_attr_t a;
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HANDLE threadH = 0;
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int result = EAGAIN;
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int run = PTW32_TRUE;
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ThreadParms *parms = NULL;
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unsigned int stackSize;
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int priority;
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pthread_t self;
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/*
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* Before doing anything, check that tid can be stored through
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* without invoking a memory protection error (segfault).
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* Make sure that the assignment below can't be optimised out by the compiler.
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* This is assured by conditionally assigning *tid again at the end.
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*/
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tid->x = 0;
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if (attr != NULL)
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{
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a = *attr;
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}
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else
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{
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a = NULL;
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}
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if ((thread = ptw32_new ()).p == NULL)
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{
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goto FAIL0;
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}
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tp = (ptw32_thread_t *) thread.p;
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priority = tp->sched_priority;
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if ((parms = (ThreadParms *) malloc (sizeof (*parms))) == NULL)
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{
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goto FAIL0;
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}
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parms->tid = thread;
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parms->start = start;
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parms->arg = arg;
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#if defined(HAVE_SIGSET_T)
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/*
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* Threads inherit their initial sigmask from their creator thread.
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*/
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self = pthread_self();
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tp->sigmask = ((ptw32_thread_t *)self.p)->sigmask;
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#endif /* HAVE_SIGSET_T */
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if (a != NULL)
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{
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stackSize = (unsigned int)a->stacksize;
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tp->detachState = a->detachstate;
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priority = a->param.sched_priority;
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#if (THREAD_PRIORITY_LOWEST > THREAD_PRIORITY_NORMAL)
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/* WinCE */
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#else
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/* Everything else */
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/*
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* Thread priority must be set to a valid system level
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* without altering the value set by pthread_attr_setschedparam().
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*/
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/*
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* PTHREAD_EXPLICIT_SCHED is the default because Win32 threads
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* don't inherit their creator's priority. They are started with
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* THREAD_PRIORITY_NORMAL (win32 value). The result of not supplying
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* an 'attr' arg to pthread_create() is equivalent to defaulting to
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* PTHREAD_EXPLICIT_SCHED and priority THREAD_PRIORITY_NORMAL.
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*/
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if (PTHREAD_INHERIT_SCHED == a->inheritsched)
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{
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/*
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* If the thread that called pthread_create() is a Win32 thread
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* then the inherited priority could be the result of a temporary
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* system adjustment. This is not the case for POSIX threads.
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*/
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#if ! defined(HAVE_SIGSET_T)
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self = pthread_self ();
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#endif
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priority = ((ptw32_thread_t *) self.p)->sched_priority;
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}
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#endif
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}
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else
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{
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/*
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* Default stackSize
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*/
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stackSize = PTHREAD_STACK_MIN;
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}
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tp->state = run ? PThreadStateInitial : PThreadStateSuspended;
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tp->keys = NULL;
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/*
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* Threads must be started in suspended mode and resumed if necessary
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* after _beginthreadex returns us the handle. Otherwise we set up a
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* race condition between the creating and the created threads.
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* Note that we also retain a local copy of the handle for use
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* by us in case thread.p->threadH gets NULLed later but before we've
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* finished with it here.
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*/
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#if ! (defined (__MINGW64__) || defined(__MINGW32__)) || defined (__MSVCRT__) || defined (__DMC__)
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tp->threadH =
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threadH =
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(HANDLE) _beginthreadex ((void *) NULL, /* No security info */
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stackSize, /* default stack size */
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ptw32_threadStart,
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parms,
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(unsigned)
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CREATE_SUSPENDED,
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(unsigned *) &(tp->thread));
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if (threadH != 0)
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{
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if (a != NULL)
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{
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(void) ptw32_setthreadpriority (thread, SCHED_OTHER, priority);
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}
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if (run)
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{
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ResumeThread (threadH);
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}
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}
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#else
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{
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ptw32_mcs_local_node_t stateLock;
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/*
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* This lock will force pthread_threadStart() to wait until we have
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* the thread handle and have set the priority.
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*/
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ptw32_mcs_lock_acquire(&tp->stateLock, &stateLock);
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tp->threadH =
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threadH =
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(HANDLE) _beginthread (ptw32_threadStart, stackSize, /* default stack size */
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parms);
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/*
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* Make the return code match _beginthreadex's.
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*/
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if (threadH == (HANDLE) - 1L)
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{
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tp->threadH = threadH = 0;
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}
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else
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{
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if (!run)
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{
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/*
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* beginthread does not allow for create flags, so we do it now.
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* Note that beginthread itself creates the thread in SUSPENDED
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* mode, and then calls ResumeThread to start it.
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*/
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SuspendThread (threadH);
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}
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if (a != NULL)
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{
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(void) ptw32_setthreadpriority (thread, SCHED_OTHER, priority);
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}
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}
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ptw32_mcs_lock_release (&stateLock);
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}
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#endif
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result = (threadH != 0) ? 0 : EAGAIN;
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/*
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* Fall Through Intentionally
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*/
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/*
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* ------------
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* Failure Code
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* ------------
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*/
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FAIL0:
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if (result != 0)
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{
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ptw32_threadDestroy (thread);
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tp = NULL;
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if (parms != NULL)
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{
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free (parms);
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}
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}
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else
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{
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*tid = thread;
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}
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#if defined(_UWIN)
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if (result == 0)
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pthread_count++;
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#endif
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return (result);
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} /* pthread_create */
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