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 LOGDEBUG(...) g_message(__VA_ARGS__)
24 static pthread_t collection_thread_id;
26 static gpointer collection_thread (gpointer unused G_GNUC_UNUSED)
28 struct timespec sleepytime;
30 sleepytime.tv_sec = _WAPI_HANDLE_COLLECTION_UPDATE_INTERVAL;
31 sleepytime.tv_nsec = 0;
33 while (_wapi_has_shut_down == FALSE) {
34 nanosleep (&sleepytime, NULL);
36 //_wapi_handle_dump ();
37 _wapi_handle_update_refs ();
39 /* This is an abuse of the collection thread, but it's
40 * better than creating a new thread just for one more
43 _wapi_process_reap ();
51 void _wapi_collection_init (void)
55 int set_stacksize = 0;
58 ret = pthread_attr_init (&attr);
61 /* Android implements pthread_attr_setstacksize(), but errors out when using
62 * PTHREAD_STACK_MIN: http://code.google.com/p/android/issues/detail?id=7808
64 #if defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE) && !defined(PLATFORM_ANDROID)
65 if (set_stacksize == 0) {
66 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
67 ret = pthread_attr_setstacksize (&attr, 65536);
69 ret = pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);
72 } else if (set_stacksize == 1) {
73 ret = pthread_attr_setstacksize (&attr, 131072);
78 ret = pthread_create (&collection_thread_id, &attr, collection_thread,
80 if (ret != 0 && set_stacksize < 2) {
85 g_error ("%s: Couldn't create handle collection thread: %s",
86 __func__, g_strerror (ret));
90 void _wapi_handle_collect (void)
92 guint32 count = _wapi_shared_layout->collection_count;
95 LOGDEBUG ("%s: (%d) Starting a collection", __func__, _wapi_getpid ());
97 /* Become the collection master */
98 thr_ret = _wapi_handle_lock_shared_handles ();
99 g_assert (thr_ret == 0);
101 LOGDEBUG ("%s: (%d) Master set", __func__, _wapi_getpid ());
103 /* If count has changed, someone else jumped in as master */
104 if (count == _wapi_shared_layout->collection_count) {
105 guint32 too_old = (guint32)(time(NULL) & 0xFFFFFFFF) - _WAPI_HANDLE_COLLECTION_EXPIRED_INTERVAL;
107 for (i = 0; i < _WAPI_HANDLE_INITIAL_COUNT; i++) {
108 struct _WapiHandleShared *data;
110 data = &_wapi_shared_layout->handles[i];
111 if (data->timestamp < too_old) {
112 LOGDEBUG ("%s: (%d) Deleting handle 0x%x", __func__, _wapi_getpid (), i);
113 memset (&_wapi_shared_layout->handles[i], '\0', sizeof(struct _WapiHandleShared));
117 for (i = 0; i < _wapi_fileshare_layout->hwm; i++) {
118 struct _WapiFileShare *file_share = &_wapi_fileshare_layout->share_info[i];
120 if (file_share->timestamp < too_old) {
121 memset (file_share, '\0',
122 sizeof(struct _WapiFileShare));
126 InterlockedIncrement ((gint32 *)&_wapi_shared_layout->collection_count);
129 _wapi_handle_unlock_shared_handles ();
131 LOGDEBUG ("%s: (%d) Collection done", __func__, _wapi_getpid ());