Merge branch 'eb/no-pthreads'

Allow us build with NO_PTHREADS=NoThanks compilation option.

* eb/no-pthreads:
  Handle atexit list internaly for unthreaded builds
  pack-objects: set number of threads before checking and warning
  index-pack: fix compilation with NO_PTHREADS

7 files changed, 58 insertions, 12 deletions

diff --git a/builtin/clone.c b/builtin/clone.c
index 7f509d06a..d5e753210 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -391,7 +391,6 @@ 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,
@@ -418,8 +417,6 @@ 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);
@@ -760,8 +757,6 @@ 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);
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index 792c66ca5..a369f5535 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -185,6 +185,9 @@ static void cleanup_thread(void)
 #define deepest_delta_lock()
 #define deepest_delta_unlock()
 
+#define type_cas_lock()
+#define type_cas_unlock()
+
 #endif
 
 
diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index a4022a78d..78c659a6b 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -1973,8 +1973,6 @@ static void ll_find_deltas(struct object_entry **list, unsigned list_size,
 
 	init_threaded_search();
 
-	if (!delta_search_threads)	/* --threads=0 means autodetect */
-		delta_search_threads = online_cpus();
 	if (delta_search_threads <= 1) {
 		find_deltas(list, &list_size, window, depth, processed);
 		cleanup_threaded_search();
@@ -2686,6 +2684,10 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
 		pack_compression_level = Z_DEFAULT_COMPRESSION;
 	else if (pack_compression_level < 0 || pack_compression_level > Z_BEST_COMPRESSION)
 		die("bad pack compression level %d", pack_compression_level);
+
+	if (!delta_search_threads)	/* --threads=0 means autodetect */
+		delta_search_threads = online_cpus();
+
 #ifdef NO_PTHREADS
 	if (delta_search_threads != 1)
 		warning("no threads support, ignoring --threads");
diff --git a/git-compat-util.h b/git-compat-util.h
index 59ecf218c..210712728 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -596,6 +596,11 @@ 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);
diff --git a/run-command.c b/run-command.c
index 46be513c4..79a0a763e 100644
--- a/run-command.c
+++ b/run-command.c
@@ -626,6 +626,45 @@ 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)
@@ -684,6 +723,7 @@ 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));
 	}
 
diff --git a/shallow.c b/shallow.c
index bd7569e81..cdd077514 100644
--- a/shallow.c
+++ b/shallow.c
@@ -227,7 +227,6 @@ 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;
 
@@ -238,10 +237,8 @@ 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",
diff --git a/thread-utils.h b/thread-utils.h
index 6fb98c333..d9a769d19 100644
--- a/thread-utils.h
+++ b/thread-utils.h
@@ -7,5 +7,9 @@
 extern int online_cpus(void);
 extern int init_recursive_mutex(pthread_mutex_t*);
 
+#else
+
+#define online_cpus() 1
+
 #endif
 #endif /* THREAD_COMPAT_H */