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index-pack: protect deepest_delta in multithread code 

deepest_delta is a global variable but is updated without protection
in resolve_delta(), a multithreaded function. Add a new mutex for it,
but only protect and update when it's actually used (i.e. show_stat is
non-zero).

Another variable that will not be updated is delta_depth in "struct
object_entry" as it's only useful when show_stat is 1. Putting it in
"if (show_stat)" makes it clearer.

The local variable "stat" is renamed to "show_stat" after moving to
global scope because the name "stat" conflicts with stat(2) syscall.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2013-03-19 20:01:15 +07:00 committed by Junio C Hamano
parent 7e2010537e
commit 3aba2fddcb
1 changed files with 23 additions and 7 deletions
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30
builtin/index-pack.c
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@ -78,6 +78,7 @@ static int nr_threads;
static int from_stdin;
static int strict;
static int verbose;
static int show_stat;
static struct progress *progress;
@ -108,6 +109,10 @@ static pthread_mutex_t work_mutex;
#define work_lock() lock_mutex(&work_mutex)
#define work_unlock() unlock_mutex(&work_mutex)
static pthread_mutex_t deepest_delta_mutex;
#define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
#define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
static pthread_key_t key;
static inline void lock_mutex(pthread_mutex_t *mutex)
@ -130,6 +135,8 @@ static void init_thread(void)
init_recursive_mutex(&read_mutex);
pthread_mutex_init(&counter_mutex, NULL);
pthread_mutex_init(&work_mutex, NULL);
if (show_stat)
pthread_mutex_init(&deepest_delta_mutex, NULL);
pthread_key_create(&key, NULL);
thread_data = xcalloc(nr_threads, sizeof(*thread_data));
threads_active = 1;
@ -143,6 +150,8 @@ static void cleanup_thread(void)
pthread_mutex_destroy(&read_mutex);
pthread_mutex_destroy(&counter_mutex);
pthread_mutex_destroy(&work_mutex);
if (show_stat)
pthread_mutex_destroy(&deepest_delta_mutex);
pthread_key_delete(key);
free(thread_data);
}
@ -158,6 +167,9 @@ static void cleanup_thread(void)
#define work_lock()
#define work_unlock()
#define deepest_delta_lock()
#define deepest_delta_unlock()
#endif
@ -833,9 +845,13 @@ static void resolve_delta(struct object_entry *delta_obj,
void *base_data, *delta_data;
delta_obj->real_type = base->obj->real_type;
delta_obj->delta_depth = base->obj->delta_depth + 1;
if (deepest_delta < delta_obj->delta_depth)
deepest_delta = delta_obj->delta_depth;
if (show_stat) {
delta_obj->delta_depth = base->obj->delta_depth + 1;
deepest_delta_lock();
if (deepest_delta < delta_obj->delta_depth)
deepest_delta = delta_obj->delta_depth;
deepest_delta_unlock();
}
delta_obj->base_object_no = base->obj - objects;
delta_data = get_data_from_pack(delta_obj);
base_data = get_base_data(base);
@ -1461,7 +1477,7 @@ static void show_pack_info(int stat_only)
int cmd_index_pack(int argc, const char **argv, const char *prefix)
{
int i, fix_thin_pack = 0, verify = 0, stat_only = 0, stat = 0;
int i, fix_thin_pack = 0, verify = 0, stat_only = 0;
const char *curr_pack, *curr_index;
const char *index_name = NULL, *pack_name = NULL;
const char *keep_name = NULL, *keep_msg = NULL;
@ -1494,10 +1510,10 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
verify = 1;
} else if (!strcmp(arg, "--verify-stat")) {
verify = 1;
stat = 1;
show_stat = 1;
} else if (!strcmp(arg, "--verify-stat-only")) {
verify = 1;
stat = 1;
show_stat = 1;
stat_only = 1;
} else if (!strcmp(arg, "--keep")) {
keep_msg = "";
@ -1605,7 +1621,7 @@ int cmd_index_pack(int argc, const char **argv, const char *prefix)
if (strict)
check_objects();
if (stat)
if (show_stat)
show_pack_info(stat_only);
idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *));