Fix use of mutex in threaded grep

The program can decide at runtime not to use threading even if the support
is compiled in.  In such a case, mutexes are not necessary and left
uninitialized.  But the code incorrectly tried to take and release the
read_sha1_mutex unconditionally.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
Acked-by: Fredrik Kuivinen <frekui@gmail.com>

diff --git a/builtin-grep.c b/builtin-grep.c
index 26d4deb1cce3e5540411a47fdf35085649669d06..362122c4325a0419a038fda52768d78d3e12dc31 100644 (file)
--- a/builtin-grep.c
+++ b/builtin-grep.c
@@ -408,15 +408,25 @@ static int pathspec_matches(const char **paths, const char *name, int max_depth)
        return 0;
 }
 
+static void *lock_and_read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
+{
+       void *data;
+
+       if (use_threads) {
+               read_sha1_lock();
+               data = read_sha1_file(sha1, type, size);
+               read_sha1_unlock();
+       } else {
+               data = read_sha1_file(sha1, type, size);
+       }
+       return data;
+}
+
 static void *load_sha1(const unsigned char *sha1, unsigned long *size,
                       const char *name)
 {
        enum object_type type;
-       char *data;
-
-       read_sha1_lock();
-       data = read_sha1_file(sha1, &type, size);
-       read_sha1_unlock();
+       void *data = lock_and_read_sha1_file(sha1, &type, size);
 
        if (!data)
                error("'%s': unable to read %s", name, sha1_to_hex(sha1));
@@ -605,10 +615,7 @@ static int grep_tree(struct grep_opt *opt, const char **paths,
                        void *data;
                        unsigned long size;
 
-                       read_sha1_lock();
-                       data = read_sha1_file(entry.sha1, &type, &size);
-                       read_sha1_unlock();
-
+                       data = lock_and_read_sha1_file(entry.sha1, &type, &size);
                        if (!data)
                                die("unable to read tree (%s)",
                                    sha1_to_hex(entry.sha1));