diff options
Diffstat (limited to 'elf/dl-close.c')
| -rw-r--r-- | elf/dl-close.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/elf/dl-close.c b/elf/dl-close.c index 7e851cd0af..fa9e92cb9f 100644 --- a/elf/dl-close.c +++ b/elf/dl-close.c @@ -1,5 +1,5 @@ -/* _dl_close -- Close a shared object opened by `_dl_open'. - Copyright (C) 1996 Free Software Foundation, Inc. +/* Close a shared object opened by `_dl_open'. + Copyright (C) 1996, 1997 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 @@ -23,8 +23,14 @@ #include <string.h> #include <sys/types.h> #include <sys/mman.h> +#include <libc-lock.h> +/* During the program run we must not modify the global data of + loaded shared object simultanously in two threads. Therefore we + protect `dlopen' and `dlclose' in dlclose.c. */ +__libc_lock_define (extern, _dl_load_lock) + #define LOSE(s) _dl_signal_error (0, map->l_name, s) void @@ -36,10 +42,16 @@ _dl_close (struct link_map *map) if (map->l_opencount == 0) LOSE ("shared object not open"); + /* Acquire the lock. */ + __libc_lock_lock (_dl_load_lock); + /* Decrement the reference count. */ if (--map->l_opencount > 0 || map->l_type != lt_loaded) - /* There are still references to this object. Do nothing more. */ - return; + { + /* There are still references to this object. Do nothing more. */ + __libc_lock_unlock (_dl_load_lock); + return; + } /* Notify the debugger we are about to remove some loaded objects. */ _r_debug.r_state = RT_DELETE; @@ -114,4 +126,7 @@ _dl_close (struct link_map *map) /* Notify the debugger those objects are finalized and gone. */ _r_debug.r_state = RT_CONSISTENT; _dl_debug_state (); + + /* Release the lock. */ + __libc_lock_unlock (_dl_load_lock); } |