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dir.c: revert r60772, r60770, and r60769

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Using readdir(3) without any locking causes thread-safety
problems if directory streams get shared between threads.  On
ancient platforms, readdir(3) may have thread-safety problems
even on different directory streams.

Using readdir_r(3) is not viable, either, as it's deprecated
due to name overflow problems.

So for now, rely on GVL as in previous Rubies and perhaps
consider per-"struct dir_data" mutexes for modern platforms
which allow concurrent calls to readdir(3) on different
directory streams.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60774 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2017-11-15 07:24:26 +00:00
parent e5b968f571
commit 0cc57ea018
1 changed files with 11 additions and 30 deletions
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41
dir.c
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@ -743,23 +743,6 @@ to_be_skipped(const struct dirent *dp)
return FALSE;
}
static void *
nogvl_readdir(void *ptr)
{
struct dir_data *dirp = ptr;
return READDIR(dirp->dir, dirp->enc);
}
static struct dirent *
readdir_without_gvl(struct dir_data *dirp)
{
if (rb_cThread) /* VM is running */
return rb_thread_call_without_gvl(nogvl_readdir, dirp, RUBY_UBF_IO, 0);
else
return READDIR(dirp->dir, dirp->enc);
}
/*
* call-seq:
* dir.read -> string or nil
@ -780,7 +763,7 @@ dir_read(VALUE dir)
GetDIR(dir, dirp);
errno = 0;
if ((dp = readdir_without_gvl(dirp))) {
if ((dp = READDIR(dirp->dir, dirp->enc)) != NULL) {
return rb_external_str_new_with_enc(dp->d_name, NAMLEN(dp), dirp->enc);
}
else {
@ -835,7 +818,7 @@ dir_each_entry(VALUE dir, VALUE (*each)(VALUE, VALUE), VALUE arg, int children_o
GetDIR(dir, dirp);
rewinddir(dirp->dir);
IF_NORMALIZE_UTF8PATH(norm_p = need_normalization(dirp->dir, RSTRING_PTR(dirp->path)));
while ((dp = readdir_without_gvl(dirp)) != NULL) {
while ((dp = READDIR(dirp->dir, dirp->enc)) != NULL) {
const char *name = dp->d_name;
size_t namlen = NAMLEN(dp);
VALUE path;
@ -2023,27 +2006,25 @@ glob_helper(
if (pathtype == path_noent) return 0;
if (magical || recursive) {
struct dir_data dd;
struct dirent *dp;
DIR *dirp;
# if USE_NAME_ON_FS == USE_NAME_ON_FS_BY_FNMATCH
char *plainname = 0;
# endif
IF_NORMALIZE_UTF8PATH(int norm_p);
dd.enc = enc;
# if USE_NAME_ON_FS == USE_NAME_ON_FS_BY_FNMATCH
if (cur + 1 == end && (*cur)->type <= ALPHA) {
plainname = join_path(path, pathlen, dirsep, (*cur)->str, strlen((*cur)->str));
if (!plainname) return -1;
dd.dir = do_opendir(fd, plainname, flags, enc, funcs->error, arg, &status);
dirp = do_opendir(fd, plainname, flags, enc, funcs->error, arg, &status);
GLOB_FREE(plainname);
}
else
# else
;
# endif
dd.dir = do_opendir(fd, *base ? base : ".", flags, enc, funcs->error, arg, &status);
if (dd.dir == NULL) {
dirp = do_opendir(fd, *base ? base : ".", flags, enc, funcs->error, arg, &status);
if (dirp == NULL) {
# if FNM_SYSCASE || NORMALIZE_UTF8PATH
if ((magical < 2) && !recursive && (errno == EACCES)) {
/* no read permission, fallback */
@ -2052,19 +2033,19 @@ glob_helper(
# endif
return status;
}
IF_NORMALIZE_UTF8PATH(norm_p = need_normalization(dd.dir, *base ? base : "."));
IF_NORMALIZE_UTF8PATH(norm_p = need_normalization(dirp, *base ? base : "."));
# if NORMALIZE_UTF8PATH
if (!(norm_p || magical || recursive)) {
closedir(dd.dir);
closedir(dirp);
goto literally;
}
# endif
# ifdef HAVE_GETATTRLIST
if (is_case_sensitive(dd.dir, path) == 0)
if (is_case_sensitive(dirp, path) == 0)
flags |= FNM_CASEFOLD;
# endif
while ((dp = readdir_without_gvl(&dd)) != NULL) {
while ((dp = READDIR(dirp, enc)) != NULL) {
char *buf;
rb_pathtype_t new_pathtype = path_unknown;
const char *name;
@ -2159,7 +2140,7 @@ glob_helper(
if (status) break;
}
closedir(dd.dir);
closedir(dirp);
}
else if (plain) {
struct glob_pattern **copy_beg, **copy_end, **cur2;