Reviewed by: julian

Submitted by:	 john birrel

One version of the pthreads library
another will follow with differnt actions under some cases..
not QUITE complete

1 files changed, 167 insertions, 0 deletions

diff --git a/lib/libpthread/thread/thr_exit.c b/lib/libpthread/thread/thr_exit.c
new file mode 100644
index 0000000..292fce9
--- /dev/null
+++ b/lib/libpthread/thread/thr_exit.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by John Birrell.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+#include <errno.h>
+#include <string.h>
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+
+void
+_thread_exit(char *fname, int lineno, char *string)
+{
+	char            s[256];
+
+	/* Prepare an error message string: */
+	strcpy(s, "Fatal error '");
+	strcat(s, string);
+	strcat(s, "' at line ? ");
+	strcat(s, "in file ");
+	strcat(s, fname);
+	strcat(s, " (errno = ?");
+	strcat(s, ")\n");
+
+	/* Write the string to the standard error file descriptor: */
+	_thread_sys_write(2, s, strlen(s));
+
+	/* Force this process to exit: */
+	_exit(1);
+}
+
+void
+pthread_exit(void *status)
+{
+	int             sig;
+	long            l;
+	pthread_t       pthread;
+
+	/* Block signals: */
+	_thread_kern_sig_block(NULL);
+
+	/* Save the return value: */
+	_thread_run->ret = status;
+
+	while (_thread_run->cleanup != NULL) {
+		_thread_cleanup_pop(1);
+	}
+
+	if (_thread_run->attr.cleanup_attr != NULL) {
+		_thread_run->attr.cleanup_attr(_thread_run->attr.arg_attr);
+	}
+	/* Check if there is thread specific data: */
+	if (_thread_run->specific_data != NULL) {
+		/* Run the thread-specific data destructors: */
+		_thread_cleanupspecific();
+	}
+	/* Check if there are any threads joined to this one: */
+	while ((pthread = _thread_queue_deq(&(_thread_run->join_queue))) != NULL) {
+		/* Wake the joined thread and let it detach this thread: */
+		pthread->state = PS_RUNNING;
+	}
+
+	/* Check if the running thread is at the head of the linked list: */
+	if (_thread_link_list == _thread_run) {
+		/* There is no previous thread: */
+		_thread_link_list = _thread_run->nxt;
+	} else {
+		/* Point to the first thread in the list: */
+		pthread = _thread_link_list;
+
+		/*
+		 * Enter a loop to find the thread in the linked list before
+		 * the running thread: 
+		 */
+		while (pthread != NULL && pthread->nxt != _thread_run) {
+			/* Point to the next thread: */
+			pthread = pthread->nxt;
+		}
+
+		/* Check that a previous thread was found: */
+		if (pthread != NULL) {
+			/*
+			 * Point the previous thread to the one after the
+			 * running thread: 
+			 */
+			pthread->nxt = _thread_run->nxt;
+		}
+	}
+
+	/* Check if this is a signal handler thread: */
+	if (_thread_run->parent_thread != NULL) {
+		/*
+		 * Enter a loop to search for other threads with the same
+		 * parent: 
+		 */
+		for (pthread = _thread_link_list; pthread != NULL; pthread = pthread->nxt) {
+			/* Compare the parent thread pointers: */
+			if (pthread->parent_thread == _thread_run->parent_thread) {
+				/*
+				 * The parent thread is waiting on at least
+				 * one other signal handler. Exit the loop
+				 * now that this is known. 
+				 */
+				break;
+			}
+		}
+
+		/*
+		 * Check if the parent is not waiting on any other signal
+		 * handler threads: 
+		 */
+		if (pthread == NULL) {
+			/* Allow the parent thread to run again: */
+			_thread_run->parent_thread->state = PS_RUNNING;
+		}
+		/* Get the signal number: */
+		l = (long) _thread_run->arg;
+		sig = (int) l;
+
+		/* Unblock the signal from the parent thread: */
+		sigdelset(&_thread_run->parent_thread->sigmask, sig);
+	}
+	/*
+	 * This thread will never run again. Add it to the list of dead
+	 * threads: 
+	 */
+	_thread_run->nxt = _thread_dead;
+	_thread_dead = _thread_run;
+
+	/*
+	 * The running thread is no longer in the thread link list so it will
+	 * now die: 
+	 */
+	_thread_kern_sched_state(PS_DEAD, __FILE__, __LINE__);
+
+	/* This point should not be reached. */
+	PANIC("Dead thread has resumed");
+}
+#endif