src/lib/ecore_x/xcb/ecore_xcb_sync.c

   1 /*
   2  * vim:ts=8:sw=3:sts=8:noexpandtab:cino=>5n-3f0^-2{2
   3  */
   4
   5 #include "ecore_xcb_private.h"
   6
   7
   8 /**
   9  * @defgroup Ecore_X_Sync_Group X Sync Extension Functions
  10  *
  11  * Functions related to the X Sync extension.
  12  */
  13
  14
  15 #ifdef ECORE_XCB_SYNC
  16 static int _sync_available = 0;
  17 static xcb_sync_initialize_cookie_t _ecore_xcb_sync_init_cookie;
  18 #endif /* ECORE_XCB_SYNC */
  19
  20
  21 /* To avoid round trips, the initialization is separated in 2
  22    functions: _ecore_xcb_sync_init and
  23    _ecore_xcb_sync_init_finalize. The first one gets the cookies and
  24    the second one gets the replies and set the atoms. */
  25
  26 void
  27 _ecore_x_sync_init(const xcb_query_extension_reply_t *reply)
  28 {
  29 #ifdef ECORE_XCB_SYNC
  30    if (reply && (reply->present))
  31      _ecore_xcb_sync_init_cookie = xcb_sync_initialize_unchecked(_ecore_xcb_conn,
  32                                                                  XCB_SYNC_MAJOR_VERSION,
  33                                                                  XCB_SYNC_MINOR_VERSION);
  34 #endif /* ECORE_XCB_SYNC */
  35 }
  36
  37 void
  38 _ecore_x_sync_init_finalize(void)
  39 {
  40 #ifdef ECORE_XCB_SYNC
  41    xcb_sync_initialize_reply_t *reply;
  42
  43    reply = xcb_sync_initialize_reply(_ecore_xcb_conn,
  44                                      _ecore_xcb_sync_init_cookie, NULL);
  45
  46    if (reply)
  47      {
  48        if (reply->major_version >= 3)
  49         _sync_available = 1;
  50         free(reply);
  51      }
  52 #endif /* ECORE_XCB_SYNC */
  53 }
  54
  55
  56 /**
  57  * Return whether the X server supports the Sync Extension.
  58  * @return 1 if the X Sync Extension is available, 0 otherwise.
  59  *
  60  * Return 1 if the X server supports the Sync Extension version 3.0,
  61  * 0 otherwise.
  62  * @ingroup Ecore_X_Sync_Group
  63  */
  64 EAPI int
  65 ecore_x_sync_query(void)
  66 {
  67 #ifdef ECORE_XCB_SYNC
  68    return _sync_available;
  69 #else
  70    return 0;
  71 #endif /* ECORE_XCB_SYNC */
  72 }
  73
  74
  75 /**
  76  * Create a new alarm.
  77  * @param counter A counter.
  78  * @return        A newly created alarm.
  79  *
  80  * Create a new alarm.
  81  * @ingroup Ecore_X_Sync_Group
  82  */
  83 EAPI Ecore_X_Sync_Alarm
  84 ecore_x_sync_alarm_new(Ecore_X_Sync_Counter counter)
  85 {
  86 #ifdef ECORE_XCB_SYNC
  87    uint32_t           value_list[6];
  88    xcb_sync_int64_t   init;
  89    Ecore_X_Sync_Alarm alarm;
  90    uint32_t           value_mask;
  91
  92    init.lo = 0;
  93    init.hi = 0;
  94    xcb_sync_set_counter(_ecore_xcb_conn, counter, init);
  95
  96    value_mask =
  97      XCB_SYNC_CA_COUNTER | XCB_SYNC_CA_VALUE_TYPE |
  98      XCB_SYNC_CA_VALUE   | XCB_SYNC_CA_TEST_TYPE  |
  99      XCB_SYNC_CA_DELTA   | XCB_SYNC_CA_EVENTS;
 100    value_list[0] = counter;
 101    value_list[1] = XCB_SYNC_VALUETYPE_ABSOLUTE;
 102    value_list[2] = 1;
 103    value_list[3] = XCB_SYNC_TESTTYPE_POSITIVE_COMPARISON;
 104    value_list[4] = 1;
 105    value_list[5] = 1;
 106    alarm = xcb_generate_id(_ecore_xcb_conn);
 107    xcb_sync_create_alarm(_ecore_xcb_conn,
 108                          alarm,
 109                          value_mask,
 110                          (const uint32_t *)value_list);
 111
 112    ecore_x_sync();
 113    return alarm;
 114 #else
 115    return 0;
 116 #endif /* ECORE_XCB_SYNC */
 117 }
 118
 119
 120 /**
 121  * Delete an alarm.
 122  * @param alarm The alarm to delete.
 123  * @return      1 on success, 0 otherwise.
 124  *
 125  * Delete the @p alarm. Returns 1 on success, 0 otherwise.
 126  * @ingroup Ecore_X_Sync_Group
 127  */
 128 EAPI int
 129 ecore_x_sync_alarm_free(Ecore_X_Sync_Alarm alarm)
 130 {
 131 #ifdef ECORE_XCB_SYNC
 132    xcb_sync_destroy_alarm(_ecore_xcb_conn, alarm);
 133    return 1;
 134 #else
 135    return 0;
 136 #endif /* ECORE_XCB_SYNC */
 137 }
 138
 139 /* FIXME: round trip */
 140
 141 EAPI int
 142 ecore_x_sync_counter_query(Ecore_X_Sync_Counter counter, unsigned int *val)
 143 {
 144 #ifdef ECORE_XCB_SYNC
 145   xcb_sync_query_counter_cookie_t cookie;
 146   xcb_sync_query_counter_reply_t *reply;
 147
 148   cookie = xcb_sync_query_counter_unchecked(_ecore_xcb_conn, counter);
 149   reply = xcb_sync_query_counter_reply(_ecore_xcb_conn, cookie, NULL);
 150   if (reply)
 151     {
 152        *val = (unsigned int)reply->counter_value.lo;
 153        free(reply);
 154        return 1;
 155     }
 156 #endif /* ECORE_XCB_SYNC */
 157
 158   return 0;
 159 }