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Diffstat (limited to 'nuttx/sched/work_cancel.c')
-rw-r--r-- | nuttx/sched/work_cancel.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/nuttx/sched/work_cancel.c b/nuttx/sched/work_cancel.c new file mode 100644 index 000000000..c277f024d --- /dev/null +++ b/nuttx/sched/work_cancel.c @@ -0,0 +1,117 @@ +/**************************************************************************** + * sched/work_cancel.c + * + * Copyright (C) 2009-2010 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 <queue.h> +#include <assert.h> +#include <errno.h> +#include <debug.h> + +#include <nuttx/arch.h> +#include <nuttx/wqueue.h> + +#include "work_internal.h" + +#ifdef CONFIG_SCHED_WORKQUEUE + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Public Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ +/**************************************************************************** + * Name: work_cancel + * + * Description: + * Cancel previously queued work. This removes work from the work queue. + * After work has been canceled, it may be re-queue by calling work_queue() + * again. + * + * Input parameters: + * work - The previously queue work structure to cancel + * + * Returned Value: + * Zero on success, a negated errno on failure + * + ****************************************************************************/ + +int work_cancel(struct work_s *work) +{ + irqstate_t flags; + + DEBUGASSERT(work != NULL); + + /* Cancelling the work is simply a matter of removing the work structure + * from the work queue. This must be done with interrupts disabled because + * new work is typically added to the work queue from interrupt handlers. + */ + + flags = irqsave(); + if (work->worker != NULL) + { + DEBUGASSERT(work->dq.flink || (FAR dq_entry_t *)work == g_work.head); + DEBUGASSERT(work->dq.blink || (FAR dq_entry_t *)work == g_work.tail); + dq_rem((FAR dq_entry_t *)work, &g_work); + + work->worker = NULL; + } + + irqrestore(flags); + return OK; +} +#endif /* CONFIG_SCHED_WORKQUEUE */ |