summaryrefslogtreecommitdiff
path: root/pthreads/src/create.c
diff options
context:
space:
mode:
Diffstat (limited to 'pthreads/src/create.c')
-rw-r--r--pthreads/src/create.c308
1 files changed, 308 insertions, 0 deletions
diff --git a/pthreads/src/create.c b/pthreads/src/create.c
new file mode 100644
index 0000000..e154185
--- /dev/null
+++ b/pthreads/src/create.c
@@ -0,0 +1,308 @@
+/*
+ * 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 */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-25 23:59:36 +0000