diff options
Diffstat (limited to 'fork.c')
| -rw-r--r-- | fork.c | 150 |
1 files changed, 18 insertions, 132 deletions
@@ -3,141 +3,27 @@ * * Description: * Implementation of fork() for POSIX threads. + * + * Pthreads-win32 - POSIX Threads Library for Win32 + * Copyright (C) 1998 + * + * This library 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 library 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. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the Free + * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, + * MA 02111-1307, USA */ #include "pthread.h" #include "implement.h" -#if 0 /* Pre Bossom */ - -int -pthread_atfork(void (*prepare)(void), - void (*parent)(void), - void (*child)(void)) -{ - /* Push handlers (unless NULL) onto their respective stacks. - - Local implementation semantics: - If we get an ENOMEM at any time in here then ALL handlers - (including those from previous pthread_atfork() calls) will be - popped off each of the three atfork stacks before we return. */ - - int ret = 0; - - if (prepare != NULL) - { - /* Push prepare. */ - if (_pthread_handler_push(_PTHREAD_FORKPREPARE_STACK, - _PTHREAD_HANDLER_POP_FIFO, - (void (*)(void *)) prepare, - NULL) == ENOMEM) - { - ret = ENOMEM; - } - } - - if (parent != NULL && - ret != ENOMEM) - { - /* Push parent. */ - if (_pthread_handler_push(_PTHREAD_FORKPARENT_STACK, - _PTHREAD_HANDLER_POP_LIFO, - (void (*)(void *)) parent, - NULL) == ENOMEM) - { - ret = ENOMEM; - } - } - - if (child != NULL && - ret != ENOMEM) - { - /* Push child. */ - if (_pthread_handler_push(_PTHREAD_FORKCHILD_STACK, - _PTHREAD_HANDLER_POP_LIFO, - (void (*)(void *)) child, - NULL) == ENOMEM) - { - ret = ENOMEM; - } - } - - if (ret == ENOMEM) - { - /* Pop all handlers without executing them before we return - the error. */ - _pthread_handler_pop_all(_PTHREAD_FORKPREPARE_STACK, - _PTHREAD_HANDLER_NOEXECUTE); - - _pthread_handler_pop_all(_PTHREAD_FORKPARENT_STACK, - _PTHREAD_HANDLER_NOEXECUTE); - - _pthread_handler_pop_all(_PTHREAD_FORKCHILD_STACK, - _PTHREAD_HANDLER_NOEXECUTE); - } - - return ret; -} - -/* It looks like the GNU linker is capable of selecting this version of - fork() over a version provided in more primitive libraries further down - the linker command line. */ - -#if HAVE_PID_T && HAVE_FORK - -pid_t -fork() -{ - pid_t pid; - - /* Pop prepare handlers here. */ - _pthread_handler_pop_all(_PTHREAD_FORKPREPARE_STACK, - _PTHREAD_HANDLER_EXECUTE); - - /* Now call the real fork(). */ - - if ((pid = _fork()) > 0) - { - /* PARENT */ - /* Clear the child handler stack. */ - _pthread_handler_pop_all(_PTHREAD_FORKCHILD_STACK, - _PTHREAD_HANDLER_NOEXECUTE); - - /* Pop parent handlers and execute them. */ - _pthread_handler_pop_all(_PTHREAD_FORKPARENT_STACK, - _PTHREAD_HANDLER_EXECUTE); - - /* At this point all three atfork stacks are empty. */ - return pid; - } - else - { - /* CHILD */ - /* Clear the parent handler stack. */ - _pthread_handler_pop_all(_PTHREAD_FORKPARENT_STACK, - _PTHREAD_HANDLER_NOEXECUTE); - - /* Pop child handlers and execute them. */ - _pthread_handler_pop_all(_PTHREAD_FORKCHILD_STACK, - _PTHREAD_HANDLER_EXECUTE); - - /* At this point all three atfork stacks are empty. */ - - /* Terminate all threads except pthread_self() using - pthread_cancel(). */ - _pthread_cancel_all_not_self(); - - /* Wait for them to finish before we continue. */ - _pthread_join_all_not_self(); - - return 0; - } - - /* Not reached. */ - return 0; -} - -#endif /* HAVE_PID_T && HAVE_FORK */ - -#endif /* Pre Bossom */ |