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grep: move sha1-reading mutex into low-level code

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The multi-threaded git-grep code needs to serialize access
to the thread-unsafe read_sha1_file call. It does this with
a mutex that is local to builtin/grep.c.

Let's instead push this down into grep.c, where it can be
used by both builtin/grep.c and grep.c. This will let us
safely teach the low-level grep.c code tricks that involve
reading from the object db.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2012-02-02 03:18:41 -05:00 committed by Junio C Hamano
parent 78db6ea9dc
commit b3aeb285d0
3 changed files with 29 additions and 23 deletions
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29
builtin/grep.c
View File

@ -85,21 +85,6 @@ static inline void grep_unlock(void)
pthread_mutex_unlock(&grep_mutex);
}
/* Used to serialize calls to read_sha1_file. */
static pthread_mutex_t read_sha1_mutex;
static inline void read_sha1_lock(void)
{
if (use_threads)
pthread_mutex_lock(&read_sha1_mutex);
}
static inline void read_sha1_unlock(void)
{
if (use_threads)
pthread_mutex_unlock(&read_sha1_mutex);
}
/* Signalled when a new work_item is added to todo. */
static pthread_cond_t cond_add;
@ -254,7 +239,7 @@ static void start_threads(struct grep_opt *opt)
int i;
pthread_mutex_init(&grep_mutex, NULL);
pthread_mutex_init(&read_sha1_mutex, NULL);
pthread_mutex_init(&grep_read_mutex, NULL);
pthread_mutex_init(&grep_attr_mutex, NULL);
pthread_cond_init(&cond_add, NULL);
pthread_cond_init(&cond_write, NULL);
@ -303,7 +288,7 @@ static int wait_all(void)
}
pthread_mutex_destroy(&grep_mutex);
pthread_mutex_destroy(&read_sha1_mutex);
pthread_mutex_destroy(&grep_read_mutex);
pthread_mutex_destroy(&grep_attr_mutex);
pthread_cond_destroy(&cond_add);
pthread_cond_destroy(&cond_write);
@ -313,8 +298,6 @@ static int wait_all(void)
return hit;
}
#else /* !NO_PTHREADS */
#define read_sha1_lock()
#define read_sha1_unlock()
static int wait_all(void)
{
@ -376,9 +359,9 @@ static void *lock_and_read_sha1_file(const unsigned char *sha1, enum object_type
{
void *data;
read_sha1_lock();
grep_read_lock();
data = read_sha1_file(sha1, type, size);
read_sha1_unlock();
grep_read_unlock();
return data;
}
@ -617,10 +600,10 @@ static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
struct strbuf base;
int hit, len;
read_sha1_lock();
grep_read_lock();
data = read_object_with_reference(obj->sha1, tree_type,
&size, NULL);
read_sha1_unlock();
grep_read_unlock();
if (!data)
die(_("unable to read tree (%s)"), sha1_to_hex(obj->sha1));

6
grep.c
View File

@ -826,6 +826,12 @@ static inline void grep_attr_unlock(void)
if (grep_use_locks)
pthread_mutex_unlock(&grep_attr_mutex);
}
/*
* Same as git_attr_mutex, but protecting the thread-unsafe object db access.
*/
pthread_mutex_t grep_read_mutex;
#else
#define grep_attr_lock()
#define grep_attr_unlock()

17
grep.h
View File

@ -139,6 +139,23 @@ extern int grep_threads_ok(const struct grep_opt *opt);
*/
extern int grep_use_locks;
extern pthread_mutex_t grep_attr_mutex;
extern pthread_mutex_t grep_read_mutex;
static inline void grep_read_lock(void)
{
if (grep_use_locks)
pthread_mutex_lock(&grep_read_mutex);
}
static inline void grep_read_unlock(void)
{
if (grep_use_locks)
pthread_mutex_unlock(&grep_read_mutex);
}
#else
#define grep_read_lock()
#define grep_read_unlock()
#endif
#endif