diff options
Diffstat (limited to 'stdlib')
| -rw-r--r-- | stdlib/atexit.c | 57 | ||||
| -rw-r--r-- | stdlib/exit.c | 23 | ||||
| -rw-r--r-- | stdlib/exit.h | 12 | ||||
| -rw-r--r-- | stdlib/random.c | 30 | ||||
| -rw-r--r-- | stdlib/stdlib.h | 28 |
5 files changed, 99 insertions, 51 deletions
diff --git a/stdlib/atexit.c b/stdlib/atexit.c index a2ab453576..675de668cc 100644 --- a/stdlib/atexit.c +++ b/stdlib/atexit.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1991 Free Software Foundation, Inc. +/* Copyright (C) 1991, 1996 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -16,16 +16,16 @@ License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ -#include <ansidecl.h> +#include <libc-lock.h> #include <stdlib.h> #include "exit.h" /* Register FUNC to be executed by `exit'. */ int -DEFUN(atexit, (func), void EXFUN((*func), (NOARGS))) +atexit (void (*func) (void)) { - struct exit_function *new = __new_exitfn(); + struct exit_function *new = __new_exitfn (); if (new == NULL) return -1; @@ -36,30 +36,55 @@ DEFUN(atexit, (func), void EXFUN((*func), (NOARGS))) } +/* We change global data, so we need locking. */ +__libc_lock_define_initialized (static, lock) + + static struct exit_function_list fnlist = { NULL, 0, }; struct exit_function_list *__exit_funcs = &fnlist; struct exit_function * -DEFUN_VOID(__new_exitfn) +__new_exitfn (void) { - register struct exit_function_list *l; + struct exit_function_list *l; + size_t i = 0; + + __libc_lock_lock (lock) for (l = __exit_funcs; l != NULL; l = l->next) { - register size_t i; for (i = 0; i < l->idx; ++i) if (l->fns[i].flavor == ef_free) - return &l->fns[i]; - if (l->idx < sizeof(l->fns) / sizeof(l->fns[0])) - return &l->fns[l->idx++]; + break; + if (i < l->idx) + break; + + if (l->idx < sizeof (l->fns) / sizeof (l->fns[0])) + { + i = l->idx++; + break; + } } - l = (struct exit_function_list *) malloc(sizeof(struct exit_function_list)); if (l == NULL) - return NULL; - l->next = __exit_funcs; - __exit_funcs = l; + { + l = (struct exit_function_list *) + malloc (sizeof (struct exit_function_list)); + if (l != NULL) + { + l->next = __exit_funcs; + __exit_funcs = l; + + l->idx = 1; + i = 0; + } + } + + /* Mark entry as used, but we don't know the flavor now. */ + if (l != NULL) + l->fns[i].flavor = ef_us; + + __libc_lock_unlock (lock) - l->idx = 1; - return &l->fns[0]; + return l == NULL ? NULL : &l->fns[i]; } diff --git a/stdlib/exit.c b/stdlib/exit.c index 4f33a25cc4..ec7ee6a2db 100644 --- a/stdlib/exit.c +++ b/stdlib/exit.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1991, 1995 Free Software Foundation, Inc. +/* Copyright (C) 1991, 1995, 1996 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -16,7 +16,6 @@ License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ -#include <ansidecl.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> @@ -32,25 +31,26 @@ DEFINE_HOOK (__libc_atexit, (void)) in the reverse of the order in which they were registered perform stdio cleanup, and terminate program execution with STATUS. */ void -DEFUN(exit, (status), int status) +exit (int status) { - register CONST struct exit_function_list *l; + const struct exit_function_list *l; for (l = __exit_funcs; l != NULL; l = l->next) { - register size_t i = l->idx; + size_t i = l->idx; while (i-- > 0) { - CONST struct exit_function *CONST f = &l->fns[i]; + const struct exit_function *const f = &l->fns[i]; switch (f->flavor) { case ef_free: + case ef_us: break; case ef_on: - (*f->func.on.fn)(status, f->func.on.arg); + (*f->func.on.fn) (status, f->func.on.arg); break; case ef_at: - (*f->func.at)(); + (*f->func.at) (); break; } } @@ -60,11 +60,10 @@ DEFUN(exit, (status), int status) RUN_HOOK (__libc_atexit, ()); #else { - extern void EXFUN(_cleanup, (NOARGS)); - _cleanup(); + extern void _cleanup (void); + _cleanup (); } #endif - _exit(status); + _exit (status); } - diff --git a/stdlib/exit.h b/stdlib/exit.h index 214217853e..83d20b7451 100644 --- a/stdlib/exit.h +++ b/stdlib/exit.h @@ -1,4 +1,4 @@ -/* Copyright (C) 1991 Free Software Foundation, Inc. +/* Copyright (C) 1991, 1996 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -20,14 +20,14 @@ Cambridge, MA 02139, USA. */ struct exit_function { - enum { ef_free, ef_on, ef_at } flavor; /* `ef_free' MUST be zero! */ + enum { ef_free, ef_us, ef_on, ef_at } flavor; /* `ef_free' MUST be zero! */ union { - void EXFUN((*at), (NOARGS)); + void (*at) (void); struct { - void EXFUN((*fn), (int status, PTR arg)); - PTR arg; + void (*fn) (int status, void *arg); + void *arg; } on; } func; }; @@ -39,6 +39,6 @@ struct exit_function_list }; extern struct exit_function_list *__exit_funcs; -extern struct exit_function *EXFUN(__new_exitfn, (NOARGS)); +extern struct exit_function *__new_exitfn (void); #endif /* exit.h */ diff --git a/stdlib/random.c b/stdlib/random.c index e2b191b696..461b76f29b 100644 --- a/stdlib/random.c +++ b/stdlib/random.c @@ -22,6 +22,7 @@ * Rewritten to use reentrant functions by Ulrich Drepper, 1995. */ +#include <libc-lock.h> #include <limits.h> #include <stddef.h> #include <stdlib.h> @@ -162,6 +163,11 @@ static struct random_data unsafe_state = end_ptr : &randtbl[sizeof (randtbl) / sizeof (randtbl[0])] }; +/* POSIX.1c requires that there is mutual exclusion for the `rand' and + `srand' functions to prevent concurrent calls from modifying common + data. */ +__libc_lock_define_initialized (static, lock) + /* Initialize the random number generator based on the given seed. If the type is the trivial no-state-information type, just remember the seed. Otherwise, initializes state[] based on the given "seed" via a linear @@ -174,7 +180,9 @@ void __srandom (x) unsigned int x; { + __libc_lock_lock (lock) (void) __srandom_r (x, &unsafe_state); + __libc_lock_unlock (lock) } weak_alias (__srandom, srandom) @@ -197,10 +205,16 @@ __initstate (seed, arg_state, n) void *arg_state; size_t n; { - void *ostate = (void *) &unsafe_state.state[-1]; + void *ostate; + + __libc_lock_lock (lock) + + ostate = (void *) &unsafe_state.state[-1]; __initstate_r (seed, arg_state, n, &unsafe_state); + __libc_lock_unlock (lock) + return ostate; } @@ -218,10 +232,16 @@ void * __setstate (arg_state) void *arg_state; { - void *ostate = (void *) &unsafe_state.state[-1]; + void *ostate; + + __libc_lock_lock (lock) + + ostate = (void *) &unsafe_state.state[-1]; if (__setstate_r (arg_state, &unsafe_state) < 0) - return NULL; + ostate = NULL; + + __libc_lock_unlock (lock) return ostate; } @@ -244,8 +264,12 @@ __random () { int32_t retval; + __libc_lock_lock (lock) + (void) __random_r (&unsafe_state, &retval); + __libc_lock_unlock (lock) + return retval; } diff --git a/stdlib/stdlib.h b/stdlib/stdlib.h index cb48aa1f1c..d11b8bf73b 100644 --- a/stdlib/stdlib.h +++ b/stdlib/stdlib.h @@ -1,23 +1,23 @@ /* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc. -This file is part of the GNU C Library. + This file is part of the GNU C Library. -The GNU C 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. + The GNU C 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. -The GNU C 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. + The GNU C 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 the GNU C Library; see the file COPYING.LIB. If -not, write to the Free Software Foundation, Inc., 675 Mass Ave, -Cambridge, MA 02139, USA. */ + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ /* - * ANSI Standard: 4.10 GENERAL UTILITIES <stdlib.h> + * ISO S Standard: 4.10 GENERAL UTILITIES <stdlib.h> */ #ifndef _STDLIB_H |