Diff: mbed-rtos/rtx/rt_Event.c

Revision:

0:7766f6712673

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-rtos/rtx/rt_Event.c	Wed Mar 12 04:19:54 2014 +0000
@@ -0,0 +1,190 @@
+/*----------------------------------------------------------------------------
+ *      RL-ARM - RTX
+ *----------------------------------------------------------------------------
+ *      Name:    RT_EVENT.C
+ *      Purpose: Implements waits and wake-ups for event flags
+ *      Rev.:    V4.60
+ *----------------------------------------------------------------------------
+ *
+ * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *  - Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  - Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  - Neither the name of ARM  nor the names of its contributors may be used 
+ *    to endorse or promote products derived from this software without 
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *---------------------------------------------------------------------------*/
+
+#include "rt_TypeDef.h"
+#include "RTX_Conf.h"
+#include "rt_System.h"
+#include "rt_Event.h"
+#include "rt_List.h"
+#include "rt_Task.h"
+#include "rt_HAL_CM.h"
+
+
+/*----------------------------------------------------------------------------
+ *      Functions
+ *---------------------------------------------------------------------------*/
+
+
+/*--------------------------- rt_evt_wait -----------------------------------*/
+
+OS_RESULT rt_evt_wait (U16 wait_flags, U16 timeout, BOOL and_wait) {
+  /* Wait for one or more event flags with optional time-out.                */
+  /* "wait_flags" identifies the flags to wait for.                          */
+  /* "timeout" is the time-out limit in system ticks (0xffff if no time-out) */
+  /* "and_wait" specifies the AND-ing of "wait_flags" as condition to be met */
+  /* to complete the wait. (OR-ing if set to 0).                             */
+  U32 block_state;
+
+  if (and_wait) {
+    /* Check for AND-connected events */
+    if ((os_tsk.run->events & wait_flags) == wait_flags) {
+      os_tsk.run->events &= ~wait_flags;
+      return (OS_R_EVT);
+    }
+    block_state = WAIT_AND;
+  }
+  else {
+    /* Check for OR-connected events */
+    if (os_tsk.run->events & wait_flags) {
+      os_tsk.run->waits = os_tsk.run->events & wait_flags;
+      os_tsk.run->events &= ~wait_flags;
+      return (OS_R_EVT);
+    }
+    block_state = WAIT_OR;
+  }
+  /* Task has to wait */
+  os_tsk.run->waits = wait_flags;
+  rt_block (timeout, (U8)block_state);
+  return (OS_R_TMO);
+}
+
+
+/*--------------------------- rt_evt_set ------------------------------------*/
+
+void rt_evt_set (U16 event_flags, OS_TID task_id) {
+  /* Set one or more event flags of a selectable task. */
+  P_TCB p_tcb;
+
+  p_tcb = os_active_TCB[task_id-1];
+  if (p_tcb == NULL) {
+    return;
+  }
+  p_tcb->events |= event_flags;
+  event_flags    = p_tcb->waits;
+  /* If the task is not waiting for an event, it should not be put */
+  /* to ready state. */
+  if (p_tcb->state == WAIT_AND) {
+    /* Check for AND-connected events */
+    if ((p_tcb->events & event_flags) == event_flags) {
+      goto wkup;
+    }
+  }
+  if (p_tcb->state == WAIT_OR) {
+    /* Check for OR-connected events */
+    if (p_tcb->events & event_flags) {
+      p_tcb->waits  &= p_tcb->events;
+wkup: p_tcb->events &= ~event_flags;
+      rt_rmv_dly (p_tcb);
+      p_tcb->state   = READY;
+#ifdef __CMSIS_RTOS
+      rt_ret_val2(p_tcb, 0x08/*osEventSignal*/, p_tcb->waits); 
+#else
+      rt_ret_val (p_tcb, OS_R_EVT);
+#endif
+      rt_dispatch (p_tcb);
+    }
+  }
+}
+
+
+/*--------------------------- rt_evt_clr ------------------------------------*/
+
+void rt_evt_clr (U16 clear_flags, OS_TID task_id) {
+  /* Clear one or more event flags (identified by "clear_flags") of a */
+  /* selectable task (identified by "task"). */
+  P_TCB task = os_active_TCB[task_id-1];
+
+  if (task == NULL) {
+    return;
+  }
+  task->events &= ~clear_flags;
+}
+
+
+/*--------------------------- isr_evt_set -----------------------------------*/
+
+void isr_evt_set (U16 event_flags, OS_TID task_id) {
+  /* Same function as "os_evt_set", but to be called by ISRs. */
+  P_TCB p_tcb = os_active_TCB[task_id-1];
+
+  if (p_tcb == NULL) {
+    return;
+  }
+  rt_psq_enq (p_tcb, event_flags);
+  rt_psh_req ();
+}
+
+
+/*--------------------------- rt_evt_get ------------------------------------*/
+
+U16 rt_evt_get (void) {
+  /* Get events of a running task after waiting for OR connected events. */
+  return (os_tsk.run->waits);
+}
+
+
+/*--------------------------- rt_evt_psh ------------------------------------*/
+
+void rt_evt_psh (P_TCB p_CB, U16 set_flags) {
+  /* Check if task has to be waken up */
+  U16 event_flags;
+
+  p_CB->events |= set_flags;
+  event_flags = p_CB->waits;
+  if (p_CB->state == WAIT_AND) {
+    /* Check for AND-connected events */
+    if ((p_CB->events & event_flags) == event_flags) {
+      goto rdy;
+    }
+  }
+  if (p_CB->state == WAIT_OR) {
+    /* Check for OR-connected events */
+    if (p_CB->events & event_flags) {
+      p_CB->waits  &= p_CB->events;
+rdy:  p_CB->events &= ~event_flags;
+      rt_rmv_dly (p_CB);
+      p_CB->state   = READY;
+#ifdef __CMSIS_RTOS
+      rt_ret_val2(p_CB, 0x08/*osEventSignal*/, p_CB->waits); 
+#else
+      rt_ret_val (p_CB, OS_R_EVT);
+#endif
+      rt_put_prio (&os_rdy, p_CB);
+    }
+  }
+}
+
+/*----------------------------------------------------------------------------
+ * end of file
+ *---------------------------------------------------------------------------*/