1 /* Linuxthreads - a simple clone()-based implementation of Posix */
2 /* threads for Linux. */
3 /* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */
5 /* This program is free software; you can redistribute it and/or */
6 /* modify it under the terms of the GNU Library General Public License */
7 /* as published by the Free Software Foundation; either version 2 */
8 /* of the License, or (at your option) any later version. */
10 /* This program is distributed in the hope that it will be useful, */
11 /* but WITHOUT ANY WARRANTY; without even the implied warranty of */
12 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
13 /* GNU Library General Public License for more details. */
15 /* mods for uClibc: removed strong alias and defined funcs properly */
17 /* The "atfork" stuff */
21 #ifdef __ARCH_USE_MMU__
23 #include <bits/uClibc_mutex.h>
28 #include "internals.h"
31 void (*handler)(void);
32 struct handler_list * next;
35 static pthread_mutex_t pthread_atfork_lock = PTHREAD_MUTEX_INITIALIZER;
36 static struct handler_list * pthread_atfork_prepare = NULL;
37 static struct handler_list * pthread_atfork_parent = NULL;
38 static struct handler_list * pthread_atfork_child = NULL;
41 __UCLIBC_MUTEX_EXTERN(__malloc_heap_lock);
42 __UCLIBC_MUTEX_EXTERN(__malloc_sbrk_lock);
43 #ifdef __UCLIBC_UCLINUX_BROKEN_MUNMAP__
44 __UCLIBC_MUTEX_EXTERN(__malloc_mmb_heap_lock);
46 #elif defined(__MALLOC_STANDARD__) || defined(__MALLOC_SIMPLE__)
47 __UCLIBC_MUTEX_EXTERN(__malloc_lock);
50 static void pthread_insert_list(struct handler_list ** list,
51 void (*handler)(void),
52 struct handler_list * newlist,
55 if (handler == NULL) return;
57 while(*list != NULL) list = &((*list)->next);
59 newlist->handler = handler;
60 newlist->next = *list;
64 struct handler_list_block {
65 struct handler_list prepare, parent, child;
68 int pthread_atfork(void (*prepare)(void),
72 struct handler_list_block * block =
73 (struct handler_list_block *) malloc(sizeof(struct handler_list_block));
74 if (block == NULL) return ENOMEM;
75 __pthread_mutex_lock(&pthread_atfork_lock);
76 /* "prepare" handlers are called in LIFO */
77 pthread_insert_list(&pthread_atfork_prepare, prepare, &block->prepare, 0);
78 /* "parent" handlers are called in FIFO */
79 pthread_insert_list(&pthread_atfork_parent, parent, &block->parent, 1);
80 /* "child" handlers are called in FIFO */
81 pthread_insert_list(&pthread_atfork_child, child, &block->child, 1);
82 __pthread_mutex_unlock(&pthread_atfork_lock);
85 /*strong_alias (__pthread_atfork, pthread_atfork)*/
87 static __inline__ void pthread_call_handlers(struct handler_list * list)
89 for (/*nothing*/; list != NULL; list = list->next) (list->handler)();
92 void __pthread_once_fork_prepare(void);
93 void __pthread_once_fork_child(void);
94 void __pthread_once_fork_parent(void);
96 static pid_t __fork(void)
99 struct handler_list * prepare, * child, * parent;
101 __pthread_mutex_lock(&pthread_atfork_lock);
102 prepare = pthread_atfork_prepare;
103 child = pthread_atfork_child;
104 parent = pthread_atfork_parent;
105 pthread_call_handlers(prepare);
107 __pthread_once_fork_prepare();
109 __pthread_mutex_lock(&__malloc_sbrk_lock);
110 __pthread_mutex_lock(&__malloc_heap_lock);
111 #ifdef __UCLIBC_UCLINUX_BROKEN_MUNMAP__
112 __pthread_mutex_lock(&__malloc_mmb_heap_lock);
114 #elif defined(__MALLOC_STANDARD__) || defined(__MALLOC_SIMPLE__)
115 __pthread_mutex_lock(&__malloc_lock);
120 #if defined(__MALLOC_STANDARD__) || defined(__MALLOC_SIMPLE__)
121 __libc_lock_init_recursive(__malloc_lock);
122 #elif defined(__MALLOC__)
123 #ifdef __UCLIBC_UCLINUX_BROKEN_MUNMAP__
124 __libc_lock_init_adaptive(__malloc_mmb_heap_lock);
126 __libc_lock_init_adaptive(__malloc_heap_lock);
127 __libc_lock_init(__malloc_sbrk_lock);
129 __libc_lock_init_adaptive(pthread_atfork_lock);
130 __pthread_reset_main_thread();
132 __pthread_once_fork_child();
133 pthread_call_handlers(child);
135 #if defined(__MALLOC_STANDARD__) || defined(__MALLOC_SIMPLE__)
136 __pthread_mutex_unlock(&__malloc_lock);
137 #elif defined(__MALLOC__)
138 #ifdef __UCLIBC_UCLINUX_BROKEN_MUNMAP__
139 __pthread_mutex_unlock(&__malloc_mmb_heap_lock);
141 __pthread_mutex_unlock(&__malloc_heap_lock);
142 __pthread_mutex_unlock(&__malloc_sbrk_lock);
144 __pthread_mutex_unlock(&pthread_atfork_lock);
145 __pthread_once_fork_parent();
146 pthread_call_handlers(parent);
150 strong_alias(__fork,fork)
151 strong_alias(__fork,vfork)
155 /* We can't support pthread_atfork without MMU, since we don't have
156 fork(), and we can't offer the correct semantics for vfork(). */
157 int pthread_atfork(void (*prepare)(void),
158 void (*parent)(void),
161 /* ENOMEM is probably pushing it a little bit.
162 Take it as `no *virtual* memory' :-) */