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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [linuxthreads/] [ptfork.c] - Rev 262
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/* 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. */ /* The "atfork" stuff */ #include <errno.h> #include <stddef.h> #include <stdlib.h> #include <unistd.h> #include "pthread.h" #include "internals.h" #include <bits/libc-lock.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; pthread_mutex_lock(&pthread_atfork_lock); pthread_call_handlers(pthread_atfork_prepare); __pthread_once_fork_prepare(); __flockfilelist(); pid = __libc_fork(); if (pid == 0) { __pthread_reset_main_thread(); __fresetlockfiles(); __pthread_once_fork_child(); pthread_call_handlers(pthread_atfork_child); pthread_mutex_init(&pthread_atfork_lock, NULL); } else { __funlockfilelist(); __pthread_once_fork_parent(); pthread_call_handlers(pthread_atfork_parent); pthread_mutex_unlock(&pthread_atfork_lock); } return pid; } weak_alias (__fork, fork); #if !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 4 pid_t __vfork(void) { return __fork(); } weak_alias (__vfork, vfork); #endif /* !_ELIX_LEVEL || _ELIX_LEVEL >= 4 */
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