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, 237 insertions, 0 deletions

diff --git a/lib/libpthread/thread/thr_spec.c b/lib/libpthread/thread/thr_spec.c
new file mode 100644
index 0000000..e7c45d2
--- /dev/null
+++ b/lib/libpthread/thread/thr_spec.c
@@ -0,0 +1,237 @@
+/*
+ * 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 <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+
+/* Static variables: */
+static struct pthread_key key_table[PTHREAD_DATAKEYS_MAX];
+
+int
+pthread_keycreate(pthread_key_t * key, void (*destructor) (void *))
+{
+	for ((*key) = 0; (*key) < PTHREAD_DATAKEYS_MAX; (*key)++) {
+		if (key_table[(*key)].count == 0) {
+			key_table[(*key)].count++;
+			key_table[(*key)].destructor = destructor;
+			return (0);
+		}
+	}
+	return (EAGAIN);
+}
+
+int
+pthread_key_delete(pthread_key_t key)
+{
+	int             ret;
+	int             status;
+
+	/* Block signals: */
+	_thread_kern_sig_block(&status);
+
+	if (key < PTHREAD_DATAKEYS_MAX) {
+		switch (key_table[key].count) {
+		case 1:
+			key_table[key].destructor = NULL;
+			key_table[key].count = 0;
+		case 0:
+			ret = 0;
+			break;
+		default:
+			ret = EBUSY;
+		}
+	} else {
+		ret = EINVAL;
+	}
+
+	/* Unblock signals: */
+	_thread_kern_sig_unblock(status);
+	return (ret);
+}
+
+void 
+_thread_cleanupspecific(void)
+{
+	void           *data;
+	int             key;
+	int             itr;
+	int             status;
+
+	/* Block signals: */
+	_thread_kern_sig_block(&status);
+
+	for (itr = 0; itr < _POSIX_THREAD_DESTRUTOR_ITERATIONS; itr++) {
+		for (key = 0; key < PTHREAD_DATAKEYS_MAX; key++) {
+			if (_thread_run->specific_data_count) {
+				if (_thread_run->specific_data[key]) {
+					data = (void *) _thread_run->specific_data[key];
+					_thread_run->specific_data[key] = NULL;
+					_thread_run->specific_data_count--;
+					if (key_table[key].destructor) {
+						key_table[key].destructor(data);
+					}
+					key_table[key].count--;
+				}
+			} else {
+				free(_thread_run->specific_data);
+
+				/* Unblock signals: */
+				_thread_kern_sig_unblock(status);
+				return;
+			}
+		}
+	}
+	free(_thread_run->specific_data);
+
+	/* Unblock signals: */
+	_thread_kern_sig_unblock(status);
+}
+
+static inline const void **
+pthread_key_allocate_data(void)
+{
+	const void    **new_data;
+	if ((new_data = (const void **) malloc(sizeof(void *) * PTHREAD_DATAKEYS_MAX)) != NULL) {
+		memset((void *) new_data, 0, sizeof(void *) * PTHREAD_DATAKEYS_MAX);
+	}
+	return (new_data);
+}
+
+int 
+pthread_setspecific(pthread_key_t key, const void *value)
+{
+	pthread_t       pthread;
+	int             ret = 0;
+	int             status;
+
+	/* Block signals: */
+	_thread_kern_sig_block(&status);
+
+	/* Point to the running thread: */
+	pthread = _thread_run;
+
+	/*
+	 * Enter a loop for signal handler threads to find the parent thread
+	 * which has the specific data associated with it: 
+	 */
+	while (pthread->parent_thread != NULL) {
+		/* Point to the parent thread: */
+		pthread = pthread->parent_thread;
+	}
+
+	if ((pthread->specific_data) || (pthread->specific_data = pthread_key_allocate_data())) {
+		if ((key < PTHREAD_DATAKEYS_MAX) && (key_table)) {
+			if (key_table[key].count) {
+				if (pthread->specific_data[key] == NULL) {
+					if (value != NULL) {
+						pthread->specific_data_count++;
+						key_table[key].count++;
+					}
+				} else {
+					if (value == NULL) {
+						pthread->specific_data_count--;
+						key_table[key].count--;
+					}
+				}
+				pthread->specific_data[key] = value;
+				ret = 0;
+			} else {
+				ret = EINVAL;
+			}
+		} else {
+			ret = EINVAL;
+		}
+	} else {
+		ret = ENOMEM;
+	}
+
+	/* Unblock signals: */
+	_thread_kern_sig_unblock(status);
+	return (ret);
+}
+
+int
+pthread_getspecific(pthread_key_t key, void **p_data)
+{
+	pthread_t       pthread;
+	int             rval = 0;
+	int             status;
+
+	/* Block signals: */
+	_thread_kern_sig_block(&status);
+
+	/* Point to the running thread: */
+	pthread = _thread_run;
+
+	/*
+	 * Enter a loop for signal handler threads to find the parent thread
+	 * which has the specific data associated with it: 
+	 */
+	while (pthread->parent_thread != NULL) {
+		/* Point to the parent thread: */
+		pthread = pthread->parent_thread;
+	}
+
+	/* Check for errors: */
+	if (pthread == NULL || p_data == NULL) {
+		/* Return an invalid argument error: */
+		_thread_seterrno(_thread_run, EINVAL);
+		rval = -1;
+	}
+	/* Check if there is specific data: */
+	else if (pthread->specific_data != NULL && (key < PTHREAD_DATAKEYS_MAX) && (key_table)) {
+		/* Check if this key has been used before: */
+		if (key_table[key].count) {
+			/* Return the value: */
+			*p_data = (void *) pthread->specific_data[key];
+		} else {
+			/*
+			 * This key has not been used before, so return NULL
+			 * instead: 
+			 */
+			*p_data = NULL;
+		}
+	} else {
+		/* No specific data has been created, so just return NULL: */
+		*p_data = NULL;
+	}
+
+	/* Unblock signals: */
+	_thread_kern_sig_unblock(status);
+	return (rval);
+}
+#endif