diff options
Diffstat (limited to 'pthreads/create.c')
-rw-r--r-- | pthreads/create.c | 610 |
1 files changed, 305 insertions, 305 deletions
diff --git a/pthreads/create.c b/pthreads/create.c index 9e9388b20..3c97db082 100644 --- a/pthreads/create.c +++ b/pthreads/create.c @@ -1,305 +1,305 @@ -/* - * 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" -#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'. 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; - long 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 = 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 (__MINGW32__) || defined (__MSVCRT__) || defined (__DMC__) - - tp->threadH = - threadH = - (HANDLE) _beginthreadex ((void *) NULL, /* No security info */ - (unsigned) 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 /* __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 (&tp->cancelLock); - - tp->threadH = - threadH = - (HANDLE) _beginthread (ptw32_threadStart, (unsigned) 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); - } - } - - (void) pthread_mutex_unlock (&tp->cancelLock); - -#endif /* __MINGW32__ && ! __MSVCRT__ */ - - 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; - } - -#ifdef _UWIN - if (result == 0) - pthread_count++; -#endif - return (result); - -} /* pthread_create */ +/*
+ * 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;
+ long 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 = 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 (__MINGW32__) || defined (__MSVCRT__) || defined (__DMC__)
+
+ tp->threadH =
+ threadH =
+ (HANDLE) _beginthreadex ((void *) NULL, /* No security info */
+ (unsigned) 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 /* __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 (&tp->cancelLock);
+
+ tp->threadH =
+ threadH =
+ (HANDLE) _beginthread (ptw32_threadStart, (unsigned) 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);
+ }
+ }
+
+ (void) pthread_mutex_unlock (&tp->cancelLock);
+
+#endif /* __MINGW32__ && ! __MSVCRT__ */
+
+ 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;
+ }
+
+#ifdef _UWIN
+ if (result == 0)
+ pthread_count++;
+#endif
+ return (result);
+
+} /* pthread_create */
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