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authorNot Zed <NotZed@Ximian.com>2003-02-05 12:53:53 +0800
committerMichael Zucci <zucchi@src.gnome.org>2003-02-05 12:53:53 +0800
commit0d7462802f639ce49576f996927b308e9f856ac5 (patch)
tree7866ac337581a03d6d520f91071de60e8eca1039 /camel/camel-object.c
parent38eef72722a185273aeaeaac83faa3b99c8dad00 (diff)
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Init bag->owner to 0.
2003-02-04 Not Zed <NotZed@Ximian.com> * camel-object.c (camel_object_bag_new): Init bag->owner to 0. 2003-01-31 Not Zed <NotZed@Ximian.com> * camel-object.c (camel_object_bag_*): Changed to use a posix semaphore instead of a condition variable + flag to reserve the object bag because e_mutex_cond is broken. svn path=/trunk/; revision=19754
Diffstat (limited to 'camel/camel-object.c')
-rw-r--r--camel/camel-object.c129
1 files changed, 66 insertions, 63 deletions
diff --git a/camel/camel-object.c b/camel/camel-object.c
index b2cf6ffea5..b7f7cf5261 100644
--- a/camel/camel-object.c
+++ b/camel/camel-object.c
@@ -32,6 +32,7 @@
#ifdef ENABLE_THREADS
#include <pthread.h>
+#include <semaphore.h>
#include <e-util/e-msgport.h>
#endif
@@ -82,15 +83,12 @@ typedef struct _CamelHookPair
struct _CamelObjectBag {
GHashTable *object_table; /* object by key */
GHashTable *key_table; /* key by object */
- guint32 flags;
#ifdef ENABLE_THREADS
- pthread_t owner;
- pthread_cond_t cond;
+ pthread_t owner; /* the thread that has reserved the bag for a new entry */
+ sem_t reserve_sem; /* used to track ownership */
#endif
};
-#define CAMEL_OBJECT_BAG_RESERVED (1)
-
/* used to tag a bag hookpair */
static const char *bag_name = "object:bag";
@@ -1091,9 +1089,10 @@ CamelObjectBag *camel_object_bag_new(GHashFunc hash, GEqualFunc equal)
bag = g_malloc(sizeof(*bag));
bag->object_table = g_hash_table_new(hash, equal);
bag->key_table = g_hash_table_new(NULL, NULL);
- bag->flags = 0;
+ bag->owner = 0;
#ifdef ENABLE_THREADS
- pthread_cond_init(&bag->cond, NULL);
+ /* init the semaphore to 1 owner, this is who has reserved the bag for adding */
+ sem_init(&bag->reserve_sem, 0, 1);
#endif
return bag;
}
@@ -1107,11 +1106,17 @@ remove_bag(char *key, CamelObject *o, CamelObjectBag *bag)
void camel_object_bag_destroy(CamelObjectBag *bag)
{
- g_assert(bag->flags == 0);
+ int val;
+
+ sem_getvalue(&bag->reserve_sem, &val);
+ g_assert(val == 1);
g_hash_table_foreach(bag->object_table, (GHFunc)remove_bag, bag);
g_hash_table_destroy(bag->object_table);
g_hash_table_destroy(bag->key_table);
+#ifdef ENABLE_THREADS
+ sem_destroy(&bag->reserve_sem);
+#endif
g_free(bag);
}
@@ -1149,10 +1154,9 @@ void camel_object_bag_add(CamelObjectBag *bag, const char *key, void *vo)
g_hash_table_insert(bag->key_table, vo, k);
#ifdef ENABLE_THREADS
- if (bag->flags & CAMEL_OBJECT_BAG_RESERVED
- && bag->owner == pthread_self()) {
- bag->flags &= ~CAMEL_OBJECT_BAG_RESERVED;
- pthread_cond_broadcast(&bag->cond);
+ if (bag->owner == pthread_self()) {
+ bag->owner = 0;
+ sem_post(&bag->reserve_sem);
}
#endif
@@ -1167,22 +1171,24 @@ void *camel_object_bag_get(CamelObjectBag *bag, const char *key)
E_LOCK(type_lock);
- do {
- retry = FALSE;
+ o = g_hash_table_lookup(bag->object_table, key);
+ if (o) {
+ /* we use the same lock as the refcount */
+ o->ref_count++;
+ }
+#ifdef ENABLE_THREADS
+ else if (bag->owner != pthread_self()) {
+ E_UNLOCK(type_lock);
+ sem_wait(&bag->reserve_sem);
+ E_LOCK(type_lock);
+ /* re-check if it slipped in */
o = g_hash_table_lookup(bag->object_table, key);
- if (o) {
- /* we use the same lock as the refcount */
+ if (o)
o->ref_count++;
- }
-#ifdef ENABLE_THREADS
- else {
- if (bag->flags & CAMEL_OBJECT_BAG_RESERVED) {
- e_mutex_cond_wait(&bag->cond, type_lock);
- retry = TRUE;
- }
- }
+ /* we dont want to reserve the bag */
+ sem_post(&bag->reserve_sem);
+ }
#endif
- } while (retry);
E_UNLOCK(type_lock);
@@ -1196,32 +1202,30 @@ void *camel_object_bag_get(CamelObjectBag *bag, const char *key)
void *camel_object_bag_reserve(CamelObjectBag *bag, const char *key)
{
CamelObject *o;
- int retry;
E_LOCK(type_lock);
- do {
- retry = FALSE;
+ o = g_hash_table_lookup(bag->object_table, key);
+ if (o) {
+ o->ref_count++;
+ }
+#ifdef ENABLE_THREADS
+ else {
+ g_assert(bag->owner != pthread_self());
+ E_UNLOCK(type_lock);
+ sem_wait(&bag->reserve_sem);
+ E_LOCK(type_lock);
+ /* incase its slipped in while we were waiting */
o = g_hash_table_lookup(bag->object_table, key);
if (o) {
- /* we use the same lock as the refcount */
o->ref_count++;
+ /* in which case we dont need to reserve the bag either */
+ sem_post(&bag->reserve_sem);
+ } else {
+ bag->owner = pthread_self();
}
-#ifdef ENABLE_THREADS
- else {
- /* NOTE: We dont actually reserve the key, we just reserve
- the whole bag. We could do either but this is easier */
- if (bag->flags & CAMEL_OBJECT_BAG_RESERVED) {
- g_assert(bag->owner != pthread_self());
- e_mutex_cond_wait(&bag->cond, type_lock);
- retry = TRUE;
- } else {
- bag->flags |= CAMEL_OBJECT_BAG_RESERVED;
- bag->owner = pthread_self();
- }
- }
+ }
#endif
- } while (retry);
E_UNLOCK(type_lock);
@@ -1231,23 +1235,12 @@ void *camel_object_bag_reserve(CamelObjectBag *bag, const char *key)
/* abort a reserved key */
void camel_object_bag_abort(CamelObjectBag *bag, const char *key)
{
- CamelObject *o;
- int retry;
-
- E_LOCK(type_lock);
-
- /* NOTE: We dont actually reserve the key, we just reserve
- the whole bag. We could do either but this is easier */
-
+#ifdef ENABLE_THREADS
g_assert(bag->owner == pthread_self());
- g_assert(bag->flags & CAMEL_OBJECT_BAG_RESERVED);
bag->owner = 0;
- bag->flags &= ~CAMEL_OBJECT_BAG_RESERVED;
-
- pthread_cond_broadcast(&bag->cond);
-
- E_UNLOCK(type_lock);
+ sem_post(&bag->reserve_sem);
+#endif
}
static void
@@ -1262,19 +1255,29 @@ save_bag(char *key, CamelObject *o, GPtrArray *list)
GPtrArray *camel_object_bag_list(CamelObjectBag *bag)
{
GPtrArray *list;
+#ifdef ENABLE_THREADS
+ pthread_t id;
+#endif
list = g_ptr_array_new();
- E_LOCK(type_lock);
- if (bag->flags & CAMEL_OBJECT_BAG_RESERVED
- && (bag->owner != pthread_self())) {
- while (bag->flags & CAMEL_OBJECT_BAG_RESERVED)
- e_mutex_cond_wait(&bag->cond, type_lock);
- }
+#ifdef ENABLE_THREADS
+ /* make sure we own the bag */
+ id = pthread_self();
+ if (bag->owner != id)
+ sem_wait(&bag->reserve_sem);
+#endif
+ E_LOCK(type_lock);
g_hash_table_foreach(bag->object_table, (GHFunc)save_bag, list);
E_UNLOCK(type_lock);
+#ifdef ENABLE_THREADS
+ /* ... and now we no longer need it */
+ if (bag->owner != id)
+ sem_post(&bag->reserve_sem);
+#endif
+
return list;
}