Handle atexit list internaly for unthreaded builds

Wrap atexit()s calls on unthreaded builds to handle callback list
internally.

This is needed because on unthreaded builds, asyncs inherits parent's
atexit() list, that gets run as soon as the async exit()s (and again at
the end of async's parent process). That led to remove temporary files
too early.

Also remove a by-atexit-callback guard against this kind of issue in
clone.c, as this patch makes it redundant.

Fixes test 5537 (temporary shallow file vanished before unpack-objects
could open it)

BTW remove an unused variable in shallow.c.

Helped-by: Duy Nguyen <pclouds@gmail.com>
Helped-by: Andreas Schwab <schwab@linux-m68k.org>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Etienne Buira <etienne.buira@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Etienne Buira 2014-10-18 14:31:15 +02:00 committed by Junio C Hamano
parent 0c45d258ec
commit 0f4b6db3ba
4 changed files with 47 additions and 10 deletions

View File

@ -390,7 +390,6 @@ static void clone_local(const char *src_repo, const char *dest_repo)
static const char *junk_work_tree;
static const char *junk_git_dir;
static pid_t junk_pid;
static enum {
JUNK_LEAVE_NONE,
JUNK_LEAVE_REPO,
@ -417,8 +416,6 @@ static void remove_junk(void)
break;
}
if (getpid() != junk_pid)
return;
if (junk_git_dir) {
strbuf_addstr(&sb, junk_git_dir);
remove_dir_recursively(&sb, 0);
@ -759,8 +756,6 @@ int cmd_clone(int argc, const char **argv, const char *prefix)
struct refspec *refspec;
const char *fetch_pattern;
junk_pid = getpid();
packet_trace_identity("clone");
argc = parse_options(argc, argv, prefix, builtin_clone_options,
builtin_clone_usage, 0);

View File

@ -594,6 +594,11 @@ int inet_pton(int af, const char *src, void *dst);
const char *inet_ntop(int af, const void *src, char *dst, size_t size);
#endif
#ifdef NO_PTHREADS
#define atexit git_atexit
extern int git_atexit(void (*handler)(void));
#endif
extern void release_pack_memory(size_t);
typedef void (*try_to_free_t)(size_t);

View File

@ -620,6 +620,45 @@ static int async_die_is_recursing(void)
return ret != NULL;
}
#else
static struct {
void (**handlers)(void);
size_t nr;
size_t alloc;
} git_atexit_hdlrs;
static int git_atexit_installed;
static void git_atexit_dispatch()
{
size_t i;
for (i=git_atexit_hdlrs.nr ; i ; i--)
git_atexit_hdlrs.handlers[i-1]();
}
static void git_atexit_clear()
{
free(git_atexit_hdlrs.handlers);
memset(&git_atexit_hdlrs, 0, sizeof(git_atexit_hdlrs));
git_atexit_installed = 0;
}
#undef atexit
int git_atexit(void (*handler)(void))
{
ALLOC_GROW(git_atexit_hdlrs.handlers, git_atexit_hdlrs.nr + 1, git_atexit_hdlrs.alloc);
git_atexit_hdlrs.handlers[git_atexit_hdlrs.nr++] = handler;
if (!git_atexit_installed) {
if (atexit(&git_atexit_dispatch))
return -1;
git_atexit_installed = 1;
}
return 0;
}
#define atexit git_atexit
#endif
int start_async(struct async *async)
@ -678,6 +717,7 @@ int start_async(struct async *async)
close(fdin[1]);
if (need_out)
close(fdout[0]);
git_atexit_clear();
exit(!!async->proc(proc_in, proc_out, async->data));
}

View File

@ -226,7 +226,6 @@ static void remove_temporary_shallow_on_signal(int signo)
const char *setup_temporary_shallow(const struct sha1_array *extra)
{
static int installed_handler;
struct strbuf sb = STRBUF_INIT;
int fd;
@ -237,10 +236,8 @@ const char *setup_temporary_shallow(const struct sha1_array *extra)
strbuf_addstr(&temporary_shallow, git_path("shallow_XXXXXX"));
fd = xmkstemp(temporary_shallow.buf);
if (!installed_handler) {
atexit(remove_temporary_shallow);
sigchain_push_common(remove_temporary_shallow_on_signal);
}
atexit(remove_temporary_shallow);
sigchain_push_common(remove_temporary_shallow_on_signal);
if (write_in_full(fd, sb.buf, sb.len) != sb.len)
die_errno("failed to write to %s",