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libxbps: regpkgdb: use a mutex for {inc,dec}rementing the refcnt.

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This commit is contained in:
Juan RP 2011-01-18 20:18:27 +01:00
parent fe15380e1b
commit 9180bfce23
1 changed files with 35 additions and 19 deletions
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54
lib/regpkgdb_dictionary.c
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@ -28,6 +28,7 @@
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <pthread.h>
#include <xbps_api.h>
#include "xbps_api_impl.h"
@ -58,33 +59,42 @@
*/
static prop_dictionary_t regpkgdb_dict;
static size_t regpkgdb_refcount;
static size_t regpkgdb_refcnt;
static bool regpkgdb_initialized;
static pthread_mutex_t refcnt_mtx = PTHREAD_MUTEX_INITIALIZER;
prop_dictionary_t
xbps_regpkgdb_dictionary_get(void)
{
char *plist;
if (regpkgdb_initialized == false) {
plist = xbps_xasprintf("%s/%s/%s", xbps_get_rootdir(),
XBPS_META_PATH, XBPS_REGPKGDB);
if (plist == NULL)
return NULL;
if (regpkgdb_initialized) {
pthread_mutex_lock(&refcnt_mtx);
regpkgdb_refcnt++;
pthread_mutex_unlock(&refcnt_mtx);
return regpkgdb_dict;
}
regpkgdb_dict = prop_dictionary_internalize_from_zfile(plist);
if (regpkgdb_dict == NULL) {
free(plist);
if (errno != ENOENT)
xbps_dbg_printf("[regpkgdb] cannot internalize "
"regpkgdb_dict %s\n", strerror(errno));
return NULL;
}
plist = xbps_xasprintf("%s/%s/%s", xbps_get_rootdir(),
XBPS_META_PATH, XBPS_REGPKGDB);
if (plist == NULL)
return NULL;
regpkgdb_dict = prop_dictionary_internalize_from_zfile(plist);
if (regpkgdb_dict == NULL) {
free(plist);
regpkgdb_initialized = true;
xbps_dbg_printf("%s: initialized ok.\n", __func__);
}
regpkgdb_refcount++;
if (errno != ENOENT)
xbps_dbg_printf("[regpkgdb] cannot internalize "
"regpkgdb_dict %s\n", strerror(errno));
return NULL;
}
free(plist);
regpkgdb_initialized = true;
xbps_dbg_printf("%s: initialized ok.\n", __func__);
pthread_mutex_lock(&refcnt_mtx);
regpkgdb_refcnt = 1;
pthread_mutex_unlock(&refcnt_mtx);
return regpkgdb_dict;
}
@ -92,7 +102,13 @@ xbps_regpkgdb_dictionary_get(void)
void
xbps_regpkgdb_dictionary_release(void)
{
if (--regpkgdb_refcount > 0)
size_t cnt;
pthread_mutex_lock(&refcnt_mtx);
cnt = regpkgdb_refcnt--;
pthread_mutex_unlock(&refcnt_mtx);
if (cnt != 1)
return;
prop_object_release(regpkgdb_dict);