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authorEric Wong <normalperson@yhbt.net>2008-10-11 23:23:09 -0700
committerEric Wong <normalperson@yhbt.net>2008-10-12 05:27:33 -0700
commitae8e81043dcf2169f4fb137a74df9926ed248f38 (patch)
tree5589d29a045013fdefd6bdff288747d92643835a
parente018b35b0d99d24e1f3779fd51c07154b370eca9 (diff)
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dirvec: introduce locking for all iterators
Like the songvec nr_lock, only one lock is used for all traversals since they're rarely changed. This only projects traversals, but not the individual structures themselves.
-rw-r--r--src/dirvec.c36
1 files changed, 29 insertions, 7 deletions
diff --git a/src/dirvec.c b/src/dirvec.c
index 73375fc70..228c54be9 100644
--- a/src/dirvec.c
+++ b/src/dirvec.c
@@ -3,6 +3,8 @@
#include "os_compat.h"
#include "utils.h"
+static pthread_mutex_t nr_lock = PTHREAD_MUTEX_INITIALIZER;
+
static size_t dv_size(struct dirvec *dv)
{
return dv->nr * sizeof(struct directory *);
@@ -18,55 +20,71 @@ static int dirvec_cmp(const void *d1, const void *d2)
void dirvec_sort(struct dirvec *dv)
{
+ pthread_mutex_lock(&nr_lock);
qsort(dv->base, dv->nr, sizeof(struct directory *), dirvec_cmp);
+ pthread_mutex_unlock(&nr_lock);
}
struct directory *dirvec_find(const struct dirvec *dv, const char *path)
{
int i;
+ struct directory *ret = NULL;
- for (i = dv->nr; --i >= 0; )
- if (!strcmp(dv->base[i]->path, path))
- return dv->base[i];
- return NULL;
+ pthread_mutex_lock(&nr_lock);
+ for (i = dv->nr; --i >= 0; ) {
+ if (strcmp(dv->base[i]->path, path))
+ continue;
+ ret = dv->base[i];
+ break;
+ }
+ pthread_mutex_unlock(&nr_lock);
+ return ret;
}
int dirvec_delete(struct dirvec *dv, struct directory *del)
{
int i;
+ pthread_mutex_lock(&nr_lock);
for (i = dv->nr; --i >= 0; ) {
if (dv->base[i] != del)
continue;
/* we _don't_ call directory_free() here */
if (!--dv->nr) {
+ pthread_mutex_unlock(&nr_lock);
free(dv->base);
dv->base = NULL;
+ return i;
} else {
memmove(&dv->base[i], &dv->base[i + 1],
(dv->nr - i + 1) * sizeof(struct directory *));
dv->base = xrealloc(dv->base, dv_size(dv));
}
- return i;
+ break;
}
+ pthread_mutex_unlock(&nr_lock);
- return -1; /* not found */
+ return i;
}
void dirvec_add(struct dirvec *dv, struct directory *add)
{
+ pthread_mutex_lock(&nr_lock);
++dv->nr;
dv->base = xrealloc(dv->base, dv_size(dv));
dv->base[dv->nr - 1] = add;
+ pthread_mutex_unlock(&nr_lock);
}
void dirvec_destroy(struct dirvec *dv)
{
+ pthread_mutex_lock(&nr_lock);
+ dv->nr = 0;
+ pthread_mutex_unlock(&nr_lock);
if (dv->base) {
free(dv->base);
dv->base = NULL;
}
- dv->nr = 0;
}
int dirvec_for_each(const struct dirvec *dv,
@@ -74,13 +92,17 @@ int dirvec_for_each(const struct dirvec *dv,
{
size_t i;
+ pthread_mutex_lock(&nr_lock);
for (i = 0; i < dv->nr; ++i) {
struct directory *dir = dv->base[i];
assert(dir);
+ pthread_mutex_unlock(&nr_lock);
if (fn(dir, arg) < 0)
return -1;
+ pthread_mutex_lock(&nr_lock); /* dv->nr may change in fn() */
}
+ pthread_mutex_unlock(&nr_lock);
return 0;
}