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Diffstat (limited to 'nuttx/sched/sched_unlock.c')
-rw-r--r-- | nuttx/sched/sched_unlock.c | 131 |
1 files changed, 0 insertions, 131 deletions
diff --git a/nuttx/sched/sched_unlock.c b/nuttx/sched/sched_unlock.c deleted file mode 100644 index 5eafcfc9e..000000000 --- a/nuttx/sched/sched_unlock.c +++ /dev/null @@ -1,131 +0,0 @@ -/************************************************************************ - * sched/sched_unlock.c - * - * Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. 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. - * 3. Neither the name NuttX 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 THE - * COPYRIGHT OWNER OR 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. - * - ************************************************************************/ - -/************************************************************************ - * Included Files - ************************************************************************/ - -#include <nuttx/config.h> - -#include <nuttx/arch.h> - -#include "os_internal.h" - -/************************************************************************ - * Definitions - ************************************************************************/ - -/************************************************************************ - * Private Type Declarations - ************************************************************************/ - -/************************************************************************ - * Global Variables - ************************************************************************/ - -/************************************************************************ - * Private Variables - ************************************************************************/ - -/************************************************************************ - * Private Function Prototypes - ************************************************************************/ - -/************************************************************************ - * Private Functionss - ************************************************************************/ - -/************************************************************************ - * Public Functions - ************************************************************************/ - -/************************************************************************ - * Name: sched_unlock - * - * Description: - * This function decrements the preemption lock count. Typically this - * is paired with sched_lock() and concludes a critical section of - * code. Preemption will not be unlocked until sched_unlock() has - * been called as many times as sched_lock(). When the lockcount is - * decremented to zero, any tasks that were eligible to preempt the - * current task will execute. - * - ************************************************************************/ - -int sched_unlock(void) -{ - _TCB *rtcb = (_TCB*)g_readytorun.head; - - /* Check for some special cases: (1) rtcb may be NULL only during - * early boot-up phases, and (2) sched_unlock() should have no - * effect if called from the interrupt level. - */ - - if (rtcb && !up_interrupt_context()) - { - /* Prevent context switches throughout the following */ - - irqstate_t flags = irqsave(); - - /* Decrement the preemption lock counter */ - - if (rtcb->lockcount) - { - rtcb->lockcount--; - } - - /* Check if the lock counter has decremented to zero. If so, - * then pre-emption has been re-enabled. - */ - - if (rtcb->lockcount <= 0) - { - rtcb->lockcount = 0; - - /* Release any ready-to-run tasks that have collected in - * g_pendingtasks. - */ - - if (g_pendingtasks.head) - { - up_release_pending(); - } - } - - irqrestore(flags); - } - - return OK; -} |