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-rw-r--r--pthreads/src/create.c308
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diff --git a/pthreads/src/create.c b/pthreads/src/create.c
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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 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.,
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 *(*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 */