diff options
Diffstat (limited to 'pthreads/pthread_tryjoin_np.c')
| -rwxr-xr-x | pthreads/pthread_tryjoin_np.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/pthreads/pthread_tryjoin_np.c b/pthreads/pthread_tryjoin_np.c new file mode 100755 index 000000000..e9fe1dae6 --- /dev/null +++ b/pthreads/pthread_tryjoin_np.c @@ -0,0 +1,173 @@ +/*
+ * pthread_tryjoin_np.c
+ *
+ * Description:
+ * This translation unit implements functions related to thread
+ * synchronisation.
+ *
+ * --------------------------------------------------------------------------
+ *
+ * Pthreads-win32 - POSIX Threads Library for Win32
+ * Copyright(C) 1998 John E. Bossom
+ * Copyright(C) 1999,2012 Pthreads-win32 contributors
+ *
+ * Homepage1: http://sourceware.org/pthreads-win32/
+ * Homepage2: http://sourceforge.net/projects/pthreads4w/
+ *
+ * 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
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "pthread.h"
+#include "implement.h"
+
+/*
+ * Not needed yet, but defining it should indicate clashes with build target
+ * environment that should be fixed.
+ */
+#if !defined(WINCE)
+# include <signal.h>
+#endif
+
+
+int
+pthread_tryjoin_np (pthread_t thread, void **value_ptr)
+ /*
+ * ------------------------------------------------------
+ * DOCPUBLIC
+ * This function checks if 'thread' has terminated and
+ * returns the thread's exit value if 'value_ptr' is not
+ * NULL or until 'abstime' passes and returns an
+ * error. If the thread has not exited the function returns
+ * immediately. This function detaches the thread on successful
+ * completion.
+ *
+ * PARAMETERS
+ * thread
+ * an instance of pthread_t
+ *
+ * value_ptr
+ * pointer to an instance of pointer to void
+ *
+ *
+ * DESCRIPTION
+ * This function checks if 'thread' has terminated and
+ * returns the thread's exit value if 'value_ptr' is not
+ * NULL or until 'abstime' passes and returns an
+ * error. If the thread has not exited the function returns
+ * immediately. This function detaches the thread on successful
+ * completion.
+ * NOTE: Detached threads cannot be joined or canceled.
+ * In this implementation 'abstime' will be
+ * resolved to the nearest millisecond.
+ *
+ * RESULTS
+ * 0 'thread' has completed
+ * EBUSY 'thread' is still live
+ * EINVAL thread is not a joinable thread,
+ * ESRCH no thread could be found with ID 'thread',
+ * ENOENT thread couldn't find it's own valid handle,
+ * EDEADLK attempt to join thread with self
+ *
+ * ------------------------------------------------------
+ */
+{
+ int result;
+ pthread_t self;
+ ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
+ ptw32_mcs_local_node_t node;
+
+ ptw32_mcs_lock_acquire(&ptw32_thread_reuse_lock, &node);
+
+ if (NULL == tp
+ || thread.x != tp->ptHandle.x)
+ {
+ result = ESRCH;
+ }
+ else if (PTHREAD_CREATE_DETACHED == tp->detachState)
+ {
+ result = EINVAL;
+ }
+ else
+ {
+ result = 0;
+ }
+
+ ptw32_mcs_lock_release(&node);
+
+ if (result == 0)
+ {
+ /*
+ * The target thread is joinable and can't be reused before we join it.
+ */
+ self = pthread_self();
+
+ if (NULL == self.p)
+ {
+ result = ENOENT;
+ }
+ else if (pthread_equal (self, thread))
+ {
+ result = EDEADLK;
+ }
+ else
+ {
+ /*
+ * Pthread_join is a cancellation point.
+ * If we are canceled then our target thread must not be
+ * detached (destroyed). This is guaranteed because
+ * pthreadCancelableTimedWait will not return if we
+ * are canceled.
+ */
+ result = pthreadCancelableTimedWait (tp->threadH, 0);
+
+ if (0 == result)
+ {
+ if (value_ptr != NULL)
+ {
+ *value_ptr = tp->exitStatus;
+ }
+
+ /*
+ * The result of making multiple simultaneous calls to
+ * pthread_join(), pthread_timedjoin_np(), pthread_tryjoin_np()
+ * or pthread_detach() specifying the same target is undefined.
+ */
+ result = pthread_detach (thread);
+ }
+ else if (ETIMEDOUT == result)
+ {
+ result = EBUSY;
+ }
+ else
+ {
+ result = ESRCH;
+ }
+ }
+ }
+
+ return (result);
+
+}
|