diff options
Diffstat (limited to 'nuttx/sched/sched_free.c')
-rw-r--r-- | nuttx/sched/sched_free.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/nuttx/sched/sched_free.c b/nuttx/sched/sched_free.c new file mode 100644 index 000000000..4df77b109 --- /dev/null +++ b/nuttx/sched/sched_free.c @@ -0,0 +1,114 @@ +/************************************************************************ + * sched/sched_free.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 <queue.h> +#include <assert.h> + +#include <nuttx/kmalloc.h> +#include <nuttx/arch.h> +#include <nuttx/wqueue.h> +#include "os_internal.h" + +/************************************************************************ + * Definitions + ************************************************************************/ + +/************************************************************************ + * Private Type Declarations + ************************************************************************/ + +/************************************************************************ + * Global Variables + ************************************************************************/ + +/************************************************************************ + * Private Variables + ************************************************************************/ + +/************************************************************************ + * Private Function Prototypes + ************************************************************************/ + +/************************************************************************ + * Public Functions + ************************************************************************/ + +/************************************************************************ + * Name: sched_free + * + * Description: + * This function performs deallocations that the operating system may + * need to make. This special interface to free is used to handling + * corner cases where the operating system may have to perform + * deallocations from within an interrupt handler. + * + ************************************************************************/ + +void sched_free(FAR void *address) +{ + /* Check if this is an attempt to deallocate memory from an exception + * handler. If this function is called from the IDLE task, then we + * must have exclusive access to the memory manager to do this. + */ + + if (up_interrupt_context() || kmm_trysemaphore() != 0) + { + /* Yes.. Delay the deallocation until a more appropriate time. */ + + irqstate_t saved_state = irqsave(); + sq_addlast((FAR sq_entry_t*)address, (sq_queue_t*)&g_delayeddeallocations); + + /* Signal the worker thread that is has some clean up to do */ + +#ifdef CONFIG_SCHED_WORKQUEUE + work_signal(); +#endif + irqrestore(saved_state); + } + else + { + /* No.. just deallocate the memory now. */ + + kfree(address); + kmm_givesemaphore(); + } +} + |