Changes in uspace/lib/c/generic/fibril_synch.c [b72efe8:7cf7ded] in mainline

File:

• uspace/lib/c/generic/fibril_synch.c (modified) (1 diff)

uspace/lib/c/generic/fibril_synch.c

@@ -447 +447 @@
 }
 
+/** Timer fibril.
+ *
+ * @param arg   Timer
+ */
+static int fibril_timer_func(void *arg)
+{
+        fibril_timer_t *timer = (fibril_timer_t *) arg;
+        int rc;
+
+        fibril_mutex_lock(&timer->lock);
+
+        while (true) {
+                while (timer->state != fts_active &&
+                    timer->state != fts_cleanup) {
+
+                        if (timer->state == fts_cleanup)
+                                break;
+
+                        fibril_condvar_wait(&timer->cv, &timer->lock);
+                }
+
+                if (timer->state == fts_cleanup)
+                        break;
+
+                rc = fibril_condvar_wait_timeout(&timer->cv, &timer->lock,
+                    timer->delay);
+                if (rc == ETIMEOUT) {
+                        timer->state = fts_fired;
+                        fibril_mutex_unlock(&timer->lock);
+                        timer->fun(timer->arg);
+                        fibril_mutex_lock(&timer->lock);
+                }
+        }
+
+        fibril_mutex_unlock(&timer->lock);
+        return 0;
+}
+
+/** Create new timer.
+ *
+ * @return              New timer on success, @c NULL if out of memory.
+ */
+fibril_timer_t *fibril_timer_create(void)
+{
+        fid_t fid;
+        fibril_timer_t *timer;
+
+        timer = calloc(1, sizeof(fibril_timer_t));
+        if (timer == NULL)
+                return NULL;
+
+        fid = fibril_create(fibril_timer_func, (void *) timer);
+        if (fid == 0) {
+                free(timer);
+                return NULL;
+        }
+
+        fibril_mutex_initialize(&timer->lock);
+        fibril_condvar_initialize(&timer->cv);
+
+        timer->fibril = fid;
+        timer->state = fts_not_set;
+
+        fibril_add_ready(fid);
+
+        return timer;
+}
+
+/** Destroy timer.
+ *
+ * @param timer         Timer, must not be active or accessed by other threads.
+ */
+void fibril_timer_destroy(fibril_timer_t *timer)
+{
+        fibril_mutex_lock(&timer->lock);
+        assert(timer->state != fts_active);
+        timer->state = fts_cleanup;
+        fibril_condvar_broadcast(&timer->cv);
+        fibril_mutex_unlock(&timer->lock);
+}
+
+/** Set timer.
+ *
+ * Set timer to execute a callback function after the specified
+ * interval.
+ *
+ * @param timer         Timer
+ * @param delay         Delay in microseconds
+ * @param fun           Callback function
+ * @param arg           Argument for @a fun
+ */
+void fibril_timer_set(fibril_timer_t *timer, suseconds_t delay,
+    fibril_timer_fun_t fun, void *arg)
+{
+        fibril_mutex_lock(&timer->lock);
+        timer->state = fts_active;
+        timer->delay = delay;
+        timer->fun = fun;
+        timer->arg = arg;
+        fibril_condvar_broadcast(&timer->cv);
+        fibril_mutex_unlock(&timer->lock);
+}
+
+/** Clear timer.
+ *
+ * Clears (cancels) timer and returns last state of the timer.
+ * This can be one of:
+ *    - fts_not_set     If the timer has not been set or has been cleared
+ *    - fts_active      Timer was set but did not fire
+ *    - fts_fired       Timer fired
+ *
+ * @param timer         Timer
+ * @return              Last timer state
+ */
+fibril_timer_state_t fibril_timer_clear(fibril_timer_t *timer)
+{
+        fibril_timer_state_t old_state;
+
+        fibril_mutex_lock(&timer->lock);
+        old_state = timer->state;
+        timer->state = fts_not_set;
+
+        timer->delay = 0;
+        timer->fun = NULL;
+        timer->arg = NULL;
+        fibril_condvar_broadcast(&timer->cv);
+        fibril_mutex_unlock(&timer->lock);
+
+        return old_state;
+}
+
 /** @}
  */