diff options
Diffstat (limited to 'sysdeps/unix/bsd/telldir.c')
| -rw-r--r-- | sysdeps/unix/bsd/telldir.c | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/sysdeps/unix/bsd/telldir.c b/sysdeps/unix/bsd/telldir.c index 06580937e4..4400883357 100644 --- a/sysdeps/unix/bsd/telldir.c +++ b/sysdeps/unix/bsd/telldir.c @@ -36,6 +36,7 @@ struct record #define NBUCKETS 32 static struct record *records[32]; static off_t lastpos; +__libc_lock_define_initialized(static, lock); /* Locks above data. */ /* Return the current position of DIRP. */ @@ -43,6 +44,9 @@ off_t DEFUN(telldir, (dirp), DIR *dirp) { struct record *new; + off_t pos; + + __libc_lock_lock (lock); new = malloc (sizeof *new); if (new == NULL) @@ -54,7 +58,11 @@ DEFUN(telldir, (dirp), DIR *dirp) new->next = records[new->cookie % NBUCKETS]; records[new->cookie % NBUCKETS] = new; - return new->cookie; + pos = new->cookie; + + __libc_lock_unlock (lock); + + return pos; } @@ -65,11 +73,14 @@ DEFUN(seekdir, (dirp, pos), DIR *dirp AND __off_t pos) { struct record *r, **prevr; + __libc_lock_lock (lock); + for (prevr = &records[pos % NBUCKETS], r = *prevr; r != NULL; prevr = &r->next, r = r->next) if (r->cookie == pos) { + __libc_lock_lock (dirp->__lock); if (dirp->filepos != r->pos || dirp->offset != r->offset) { dirp->size = 0; /* Must read a fresh buffer. */ @@ -79,16 +90,25 @@ DEFUN(seekdir, (dirp, pos), DIR *dirp AND __off_t pos) dirp->offset = 0; /* Read entries until we reach the saved offset. */ while (dirp->offset < r->offset) - if (readdir (dirp) == NULL) - break; + { + struct dirent *scan; + __libc_lock_unlock (dirp->__lock); + scan = readdir (dirp); + __libc_lock_lock (dirp->__lock); + if (! scan) + break; + } } + __libc_lock_unlock (dirp->__lock); /* To prevent leaking memory, cookies returned from telldir can only be used once. So free this one's record now. */ *prevr = r->next; free (r); - return; + break; } - /* We lost, but have no way to indicate it. Oh well. */ + __libc_lock_unlock (lock); + + /* If we lost there is no way to indicate it. Oh well. */ } |