/* * 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) 1999,2002 Pthreads-win32 contributors * * Contact Email: rpj@ise.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., * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA */ #include "pthread.h" #include "implement.h" #ifndef _UWIN #include <process.h> #endif 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; } 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 */ ptw32_threadStart, parms, (unsigned) CREATE_SUSPENDED, (unsigned *) &(thread->thread)); if (threadH != 0) { /* * 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 (attr != NULL && *attr != NULL) { (void) SetThreadPriority(threadH, PTHREAD_INHERIT_SCHED == (*attr)->inheritsched ? GetThreadPriority(GetCurrentThread()) : (*attr)->param.sched_priority ); } if (run) { ResumeThread(threadH); } } #else /* __MINGW32__ && ! __MSVCRT__ */ /* * This lock will force pthread_threadStart() to wait until we have * the thread handle and have set the priority. */ (void) pthread_mutex_lock(&thread->cancelLock); thread->threadH = threadH = (HANDLE) _beginthread ( ptw32_threadStart, (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); } /* * 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 (attr != NULL && *attr != NULL) { (void) SetThreadPriority(threadH, PTHREAD_INHERIT_SCHED == (*attr)->inheritsched ? GetThreadPriority(GetCurrentThread()) : (*attr)->param.sched_priority ); } } (void) pthread_mutex_unlock(&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; #ifdef _UWIN if (result == 0) pthread_count++; #endif return (result); } /* pthread_create */