2 * collection.c: Garbage collection for handles
5 * Dick Porter (dick@ximian.com)
7 * (C) 2004-2006 Novell, Inc.
14 #include <sys/types.h>
17 #include <mono/io-layer/wapi.h>
18 #include <mono/io-layer/collection.h>
19 #include <mono/io-layer/handles-private.h>
22 // #define DEBUG(...) g_message(__VA_ARGS__)
27 static pthread_t collection_thread_id
;
29 static gpointer
collection_thread (gpointer unused G_GNUC_UNUSED
)
31 struct timespec sleepytime
;
33 sleepytime
.tv_sec
= _WAPI_HANDLE_COLLECTION_UPDATE_INTERVAL
;
34 sleepytime
.tv_nsec
= 0;
36 while (_wapi_has_shut_down
== FALSE
) {
37 nanosleep (&sleepytime
, NULL
);
39 //_wapi_handle_dump ();
40 _wapi_handle_update_refs ();
48 void _wapi_collection_init (void)
52 int set_stacksize
= 0;
55 ret
= pthread_attr_init (&attr
);
58 #if defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE)
59 if (set_stacksize
== 0) {
60 ret
= pthread_attr_setstacksize (&attr
, MAX (65536, PTHREAD_STACK_MIN
));
62 } else if (set_stacksize
== 1) {
63 ret
= pthread_attr_setstacksize (&attr
, 131072);
68 ret
= pthread_create (&collection_thread_id
, &attr
, collection_thread
,
70 if (ret
!= 0 && set_stacksize
< 2) {
75 g_error ("%s: Couldn't create handle collection thread: %s",
76 __func__
, g_strerror (ret
));
80 void _wapi_handle_collect (void)
82 guint32 count
= _wapi_shared_layout
->collection_count
;
85 if (!_wapi_shm_enabled ())
88 DEBUG ("%s: (%d) Starting a collection", __func__
, _wapi_getpid ());
90 /* Become the collection master */
91 thr_ret
= _wapi_handle_lock_shared_handles ();
92 g_assert (thr_ret
== 0);
94 DEBUG ("%s: (%d) Master set", __func__
, _wapi_getpid ());
96 /* If count has changed, someone else jumped in as master */
97 if (count
== _wapi_shared_layout
->collection_count
) {
98 guint32 too_old
= (guint32
)(time(NULL
) & 0xFFFFFFFF) - _WAPI_HANDLE_COLLECTION_EXPIRED_INTERVAL
;
100 for (i
= 0; i
< _WAPI_HANDLE_INITIAL_COUNT
; i
++) {
101 struct _WapiHandleShared
*data
;
103 data
= &_wapi_shared_layout
->handles
[i
];
104 if (data
->timestamp
< too_old
) {
105 DEBUG ("%s: (%d) Deleting handle 0x%x", __func__
, _wapi_getpid (), i
);
106 memset (&_wapi_shared_layout
->handles
[i
], '\0', sizeof(struct _WapiHandleShared
));
110 for (i
= 0; i
< _wapi_fileshare_layout
->hwm
; i
++) {
111 struct _WapiFileShare
*file_share
= &_wapi_fileshare_layout
->share_info
[i
];
113 if (file_share
->timestamp
< too_old
) {
114 memset (file_share
, '\0',
115 sizeof(struct _WapiFileShare
));
119 InterlockedIncrement ((gint32
*)&_wapi_shared_layout
->collection_count
);
122 _wapi_handle_unlock_shared_handles ();
124 DEBUG ("%s: (%d) Collection done", __func__
, _wapi_getpid ());