26 #include "dbus-mainloop.h"    28 #ifndef DOXYGEN_SHOULD_SKIP_THIS    30 #include <dbus/dbus-hash.h>    31 #include <dbus/dbus-list.h>    32 #include <dbus/dbus-socket-set.h>    33 #include <dbus/dbus-watch.h>    35 #define MAINLOOP_SPEW 0    42   DBusSocketSet *socket_set;
    44   int callback_list_serial;
    51   unsigned oom_watch_pending : 1;
    61 #define TIMEOUT_CALLBACK(callback) ((TimeoutCallback*)callback)    63 static TimeoutCallback*
    72   cb->timeout = timeout;
    79 timeout_callback_free (TimeoutCallback *cb)
    85 free_watch_table_entry (
void *data)
   107 _dbus_loop_new (
void)
   116                                         free_watch_table_entry);
   118   loop->socket_set = _dbus_socket_set_new (0);
   120   if (loop->watches == 
NULL || loop->socket_set == 
NULL)
   122       if (loop->watches != 
NULL)
   125       if (loop->socket_set != 
NULL)
   126         _dbus_socket_set_free (loop->socket_set);
   138 _dbus_loop_ref (DBusLoop *loop)
   149 _dbus_loop_unref (DBusLoop *loop)
   155   if (loop->refcount == 0)
   157       while (loop->need_dispatch)
   165       _dbus_socket_set_free (loop->socket_set);
   171 ensure_watch_table_entry (DBusLoop    *loop,
   176   watches = _dbus_hash_table_lookup_pollable (loop->watches, fd);
   185       if (!_dbus_hash_table_insert_pollable (loop->watches, fd, watches))
   196 cull_watches_for_invalid_fd (DBusLoop     *loop,
   202   _dbus_warn (
"invalid request, socket fd %" DBUS_POLLABLE_FORMAT 
" not open\n",
   203               _dbus_pollable_printable (fd));
   204   watches = _dbus_hash_table_lookup_pollable (loop->watches, fd);
   214   _dbus_hash_table_remove_pollable (loop->watches, fd);
   218 gc_watch_table_entry (DBusLoop      *loop,
   227   if (*watches != 
NULL)
   230   _dbus_hash_table_remove_pollable (loop->watches, fd);
   235 refresh_watches_for_fd (DBusLoop      *loop,
   240   unsigned int flags = 0;
   246     watches = _dbus_hash_table_lookup_pollable (loop->watches, fd);
   257           !_dbus_watch_get_oom_last_time (link->
data))
   265     _dbus_socket_set_enable (loop->socket_set, fd, flags);
   267     _dbus_socket_set_disable (loop->socket_set, fd);
   271 _dbus_loop_add_watch (DBusLoop  *loop,
   277   fd = _dbus_watch_get_pollable (watch);
   280   watches = ensure_watch_table_entry (loop, fd);
   288       gc_watch_table_entry (loop, watches, fd);
   295       if (!_dbus_socket_set_add (loop->socket_set, fd,
   299           _dbus_hash_table_remove_pollable (loop->watches, fd);
   306       refresh_watches_for_fd (loop, watches, fd);
   309   loop->callback_list_serial += 1;
   310   loop->watch_count += 1;
   315 _dbus_loop_toggle_watch (DBusLoop          *loop,
   318   refresh_watches_for_fd (loop, 
NULL, _dbus_watch_get_pollable (watch));
   322 _dbus_loop_remove_watch (DBusLoop         *loop,
   332   fd = _dbus_watch_get_pollable (watch);
   335   watches = _dbus_hash_table_lookup_pollable (loop->watches, fd);
   348               loop->callback_list_serial += 1;
   349               loop->watch_count -= 1;
   354               if (gc_watch_table_entry (loop, watches, fd))
   356                   _dbus_socket_set_remove (loop->socket_set, fd);
   366   _dbus_warn (
"could not find watch %p to remove\n", watch);
   370 _dbus_loop_add_timeout (DBusLoop           *loop,
   373   TimeoutCallback *tcb;
   375   tcb = timeout_callback_new (timeout);
   381       loop->callback_list_serial += 1;
   382       loop->timeout_count += 1;
   386       timeout_callback_free (tcb);
   394 _dbus_loop_remove_timeout (DBusLoop           *loop,
   403       TimeoutCallback *
this = link->
data;
   405       if (this->timeout == timeout)
   408           loop->callback_list_serial += 1;
   409           loop->timeout_count -= 1;
   410           timeout_callback_free (
this);
   418   _dbus_warn (
"could not find timeout %p to remove\n", timeout);
   425 check_timeout (
long            tv_sec,
   427                TimeoutCallback *tcb,
   432   long expiration_tv_sec;
   433   long expiration_tv_usec;
   434   long interval_seconds;
   435   long interval_milliseconds;
   442   interval_seconds = interval / 1000L;
   443   interval_milliseconds = interval % 1000L;
   445   expiration_tv_sec = tcb->last_tv_sec + interval_seconds;
   446   expiration_tv_usec = tcb->last_tv_usec + interval_milliseconds * 1000;
   447   if (expiration_tv_usec >= 1000000)
   449       expiration_tv_usec -= 1000000;
   450       expiration_tv_sec += 1;
   453   sec_remaining = expiration_tv_sec - tv_sec;
   454   msec_remaining = (expiration_tv_usec - tv_usec) / 1000L;
   457   _dbus_verbose (
"Interval is %ld seconds %ld msecs\n",
   459                  interval_milliseconds);
   460   _dbus_verbose (
"Now is  %lu seconds %lu usecs\n",
   462   _dbus_verbose (
"Last is %lu seconds %lu usecs\n",
   463                  tcb->last_tv_sec, tcb->last_tv_usec);
   464   _dbus_verbose (
"Exp is  %lu seconds %lu usecs\n",
   465                  expiration_tv_sec, expiration_tv_usec);
   466   _dbus_verbose (
"Pre-correction, sec_remaining %ld msec_remaining %ld\n",
   467                  sec_remaining, msec_remaining);
   474   if (sec_remaining < 0 || (sec_remaining == 0 && msec_remaining < 0))
   480       if (msec_remaining < 0)
   482           msec_remaining += 1000;
   490         *timeout = sec_remaining * 1000 + msec_remaining;        
   493   if (*timeout > interval)
   496       _dbus_verbose (
"System clock set backward! Resetting timeout.\n");
   498       tcb->last_tv_sec = tv_sec;
   499       tcb->last_tv_usec = tv_usec;
   505   _dbus_verbose (
"  timeout expires in %d milliseconds\n", *timeout);
   508   return *timeout == 0;
   512 _dbus_loop_dispatch (DBusLoop *loop)
   519   if (loop->need_dispatch == 
NULL)
   523   while (loop->need_dispatch != 
NULL)
   541                 _dbus_wait_for_memory ();
   550 _dbus_loop_queue_dispatch (DBusLoop       *loop,
   567 _dbus_loop_iterate (DBusLoop     *loop,
   570 #define N_STACK_DESCRIPTORS 64   572   DBusSocketEvent ready_fds[N_STACK_DESCRIPTORS];
   582   orig_depth = loop->depth;
   585   _dbus_verbose (
"Iteration block=%d depth=%d timeout_count=%d watch_count=%d\n",
   586                  block, loop->depth, loop->timeout_count, loop->watch_count);
   590       loop->timeouts == 
NULL)
   594   if (loop->timeout_count > 0)
   605           TimeoutCallback *tcb = link->
data;
   611               check_timeout (tv_sec, tv_usec, tcb, &msecs_remaining);
   614                 timeout = msecs_remaining;
   616                 timeout = MIN (msecs_remaining, timeout);
   619               _dbus_verbose (
"  timeout added, %d remaining, aggregate timeout %ld\n",
   620                              msecs_remaining, timeout);
   631               _dbus_verbose (
"  skipping disabled timeout\n");
   640   if (!block || loop->need_dispatch != 
NULL)
   644       _dbus_verbose (
"  timeout is 0 as we aren't blocking\n");
   651   if (loop->oom_watch_pending)
   652     timeout = MIN (timeout, _dbus_get_oom_wait ());
   655   _dbus_verbose (
"  polling on %d descriptors timeout %ld\n", 
_DBUS_N_ELEMENTS (ready_fds), timeout);
   658   n_ready = _dbus_socket_set_poll (loop->socket_set, ready_fds,
   662   if (loop->oom_watch_pending)
   666       loop->oom_watch_pending = 
FALSE;
   677           fd = _dbus_hash_iter_get_pollable_key (&hash_iter);
   686               if (_dbus_watch_get_oom_last_time (watch))
   688                   _dbus_watch_set_oom_last_time (watch, 
FALSE);
   694             refresh_watches_for_fd (loop, watches, fd);
   701   initial_serial = loop->callback_list_serial;
   703   if (loop->timeout_count > 0)
   715           TimeoutCallback *tcb = link->
data;
   717           if (initial_serial != loop->callback_list_serial)
   720           if (loop->depth != orig_depth)
   727               if (check_timeout (tv_sec, tv_usec,
   728                                  tcb, &msecs_remaining))
   731                   tcb->last_tv_sec = tv_sec;
   732                   tcb->last_tv_usec = tv_usec;
   735                   _dbus_verbose (
"  invoking timeout\n");
   748                   _dbus_verbose (
"  timeout has not expired\n");
   755               _dbus_verbose (
"  skipping invocation of disabled timeout\n");
   765       for (i = 0; i < n_ready; i++)
   769           unsigned int condition;
   776           if (initial_serial != loop->callback_list_serial)
   779           if (loop->depth != orig_depth)
   784           if (_DBUS_UNLIKELY (ready_fds[i].flags & _DBUS_WATCH_NVAL))
   786               cull_watches_for_invalid_fd (loop, ready_fds[i].fd);
   790           condition = ready_fds[i].flags;
   799           watches = _dbus_hash_table_lookup_pollable (loop->watches,
   823                       _dbus_watch_set_oom_last_time (watch, 
TRUE);
   824                       loop->oom_watch_pending = 
TRUE;
   829                   _dbus_verbose (
"  Invoked watch, oom = %d\n", oom);
   836                   if (initial_serial != loop->callback_list_serial ||
   837                       loop->depth != orig_depth)
   840                         refresh_watches_for_fd (loop, 
NULL, ready_fds[i].fd);
   848             refresh_watches_for_fd (loop, watches, ready_fds[i].fd);
   854   _dbus_verbose (
"  moving to next iteration\n");
   857   if (_dbus_loop_dispatch (loop))
   861   _dbus_verbose (
"Returning %d\n", retval);
   868 _dbus_loop_run (DBusLoop *loop)
   874   _dbus_loop_ref (loop);
   876   our_exit_depth = loop->depth;
   879   _dbus_verbose (
"Running main loop, depth %d -> %d\n",
   880                  loop->depth - 1, loop->depth);
   882   while (loop->depth != our_exit_depth)
   883     _dbus_loop_iterate (loop, 
TRUE);
   885   _dbus_loop_unref (loop);
   889 _dbus_loop_quit (DBusLoop *loop)
   895   _dbus_verbose (
"Quit main loop, depth %d -> %d\n",
   896                  loop->depth + 1, loop->depth);
   900 _dbus_get_oom_wait (
void)
   902 #ifdef DBUS_ENABLE_EMBEDDED_TESTS   911 _dbus_wait_for_memory (
void)
   913   _dbus_verbose (
"Waiting for more memory\n");
 Internals of DBusTimeout. 
DBusDispatchStatus
Indicates the status of incoming data on a DBusConnection. 
Implementation of DBusWatch. 
#define NULL
A null pointer, defined appropriately for C or C++. 
More memory is needed to continue. 
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0(). 
dbus_bool_t _dbus_list_length_is_one(DBusList **list)
Check whether length is exactly one. 
#define dbus_new(type, count)
Safe macro for using dbus_malloc(). 
DBUS_EXPORT dbus_bool_t dbus_watch_get_enabled(DBusWatch *watch)
Returns whether a watch is enabled or not. 
void _dbus_list_remove_link(DBusList **list, DBusList *link)
Removes a link from the list. 
DBusConnection * dbus_connection_ref(DBusConnection *connection)
Increments the reference count of a DBusConnection. 
#define _dbus_assert(condition)
Aborts with an error message if the condition is false. 
void * data
Data stored at this element. 
void _dbus_hash_table_unref(DBusHashTable *table)
Decrements the reference count for a hash table, freeing the hash table if the count reaches zero...
Implementation details of DBusConnection. 
dbus_bool_t _dbus_hash_iter_next(DBusHashIter *iter)
Move the hash iterator forward one step, to the next hash entry. 
#define _dbus_list_get_next_link(list, link)
Gets the next link in the list, or NULL if there are no more links. 
#define _DBUS_INT_MAX
Maximum value of type "int". 
DBUS_EXPORT dbus_bool_t dbus_timeout_get_enabled(DBusTimeout *timeout)
Returns whether a timeout is enabled or not. 
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0(). 
int _dbus_hash_table_get_n_entries(DBusHashTable *table)
Gets the number of hash entries in a hash table. 
void * _dbus_hash_iter_get_value(DBusHashIter *iter)
Gets the value of the current entry. 
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE. 
DBUS_EXPORT dbus_bool_t dbus_timeout_handle(DBusTimeout *timeout)
Calls the timeout handler for this timeout. 
DBusDispatchStatus dbus_connection_dispatch(DBusConnection *connection)
Processes any incoming data. 
All currently available data has been processed. 
void _dbus_warn(const char *format,...)
Prints a warning message to stderr. 
dbus_bool_t _dbus_list_append(DBusList **list, void *data)
Appends a value to the list. 
void _dbus_watch_invalidate(DBusWatch *watch)
Clears the file descriptor from a now-invalid watch object so that no one tries to use it...
void _dbus_get_monotonic_time(long *tv_sec, long *tv_usec)
Get current time, as in gettimeofday(). 
void * _dbus_list_pop_first(DBusList **list)
Removes the first value in the list and returns it. 
#define _DBUS_N_ELEMENTS(array)
Computes the number of elements in a fixed-size array using sizeof(). 
#define TRUE
Expands to "1". 
void _dbus_hash_iter_init(DBusHashTable *table, DBusHashIter *iter)
Initializes a hash table iterator. 
void _dbus_watch_unref(DBusWatch *watch)
Decrements the reference count of a DBusWatch object and finalizes the object if the count reaches ze...
int _dbus_list_get_length(DBusList **list)
Gets the length of a list. 
DBusList * _dbus_list_get_first_link(DBusList **list)
Gets the first link in the list. 
#define FALSE
Expands to "0". 
DBUS_EXPORT dbus_bool_t dbus_watch_handle(DBusWatch *watch, unsigned int flags)
Called to notify the D-Bus library when a previously-added watch is ready for reading or writing...
DBusWatch * _dbus_watch_ref(DBusWatch *watch)
Increments the reference count of a DBusWatch object. 
DBUS_EXPORT unsigned int dbus_watch_get_flags(DBusWatch *watch)
Gets flags from DBusWatchFlags indicating what conditions should be monitored on the file descriptor...
void dbus_connection_unref(DBusConnection *connection)
Decrements the reference count of a DBusConnection, and finalizes it if the count reaches zero...
Internals of DBusHashTable. 
void _dbus_sleep_milliseconds(int milliseconds)
Sleeps the given number of milliseconds. 
DBusHashTable * _dbus_hash_table_new(DBusHashType type, DBusFreeFunction key_free_function, DBusFreeFunction value_free_function)
Constructs a new hash table. 
DBUS_EXPORT int dbus_timeout_get_interval(DBusTimeout *timeout)
Gets the timeout interval.