Merge in the pthread library. This is the linuxthreads library taken from

glibc 2.1.3 and ported to work with uClibc by Stefan Soucek and Erik Andersen
(me).  Stefan has hacked things up such that linuxthreads runs on MMU-less
systems (tested only on arm-nommu).  Erik cleaned things up and made it work
properly as a shared library.
 -Erik

1 files changed, 107 insertions, 0 deletions

diff --git a/libpthread/linuxthreads/ptfork.c b/libpthread/linuxthreads/ptfork.c
new file mode 100644
index 000000000..0c4e252d6
--- /dev/null
+++ b/libpthread/linuxthreads/ptfork.c
@@ -0,0 +1,107 @@
+/* Linuxthreads - a simple clone()-based implementation of Posix        */
+/* threads for Linux.                                                   */
+/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr)              */
+/*                                                                      */
+/* This program is free software; you can redistribute it and/or        */
+/* modify it under the terms of the GNU Library General Public License  */
+/* as published by the Free Software Foundation; either version 2       */
+/* of the License, or (at your option) any later version.               */
+/*                                                                      */
+/* This program 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 Library General Public License for more details.                 */
+
+/* mods for uClibc: removed strong alias and defined funcs properly */
+
+/* The "atfork" stuff */
+
+#include <errno.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "pthread.h"
+#include "internals.h"
+
+struct handler_list {
+  void (*handler)(void);
+  struct handler_list * next;
+};
+
+static pthread_mutex_t pthread_atfork_lock = PTHREAD_MUTEX_INITIALIZER;
+static struct handler_list * pthread_atfork_prepare = NULL;
+static struct handler_list * pthread_atfork_parent = NULL;
+static struct handler_list * pthread_atfork_child = NULL;
+
+static void pthread_insert_list(struct handler_list ** list,
+                                void (*handler)(void),
+                                struct handler_list * newlist,
+                                int at_end)
+{
+  if (handler == NULL) return;
+  if (at_end) {
+    while(*list != NULL) list = &((*list)->next);
+  }
+  newlist->handler = handler;
+  newlist->next = *list;
+  *list = newlist;
+}
+
+struct handler_list_block {
+  struct handler_list prepare, parent, child;
+};
+
+int pthread_atfork(void (*prepare)(void),
+		     void (*parent)(void),
+		     void (*child)(void))
+{
+  struct handler_list_block * block =
+    (struct handler_list_block *) malloc(sizeof(struct handler_list_block));
+  if (block == NULL) return ENOMEM;
+  pthread_mutex_lock(&pthread_atfork_lock);
+  /* "prepare" handlers are called in LIFO */
+  pthread_insert_list(&pthread_atfork_prepare, prepare, &block->prepare, 0);
+  /* "parent" handlers are called in FIFO */
+  pthread_insert_list(&pthread_atfork_parent, parent, &block->parent, 1);
+  /* "child" handlers are called in FIFO */
+  pthread_insert_list(&pthread_atfork_child, child, &block->child, 1);
+  pthread_mutex_unlock(&pthread_atfork_lock);
+  return 0;
+}
+//strong_alias (__pthread_atfork, pthread_atfork)
+
+static inline void pthread_call_handlers(struct handler_list * list)
+{
+  for (/*nothing*/; list != NULL; list = list->next) (list->handler)();
+}
+
+extern int __libc_fork(void);
+
+pid_t __fork(void)
+{
+  pid_t pid;
+  struct handler_list * prepare, * child, * parent;
+
+  pthread_mutex_lock(&pthread_atfork_lock);
+  prepare = pthread_atfork_prepare;
+  child = pthread_atfork_child;
+  parent = pthread_atfork_parent;
+  pthread_mutex_unlock(&pthread_atfork_lock);
+  pthread_call_handlers(prepare);
+  pid = __libc_fork();
+  if (pid == 0) {
+    __pthread_reset_main_thread();
+    __fresetlockfiles();
+    pthread_call_handlers(child);
+  } else {
+    pthread_call_handlers(parent);
+  }
+  return pid;
+}
+weak_alias (__fork, fork);
+
+pid_t __vfork(void)
+{
+  return __fork();
+}
+weak_alias (__vfork, vfork);