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Diffstat (limited to 'nuttx/sched/sched_free.c')
-rw-r--r-- | nuttx/sched/sched_free.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/nuttx/sched/sched_free.c b/nuttx/sched/sched_free.c new file mode 100644 index 0000000000..205da0a465 --- /dev/null +++ b/nuttx/sched/sched_free.c @@ -0,0 +1,103 @@ +/************************************************************ + * sched_free.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 Gregory Nutt 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 <sys/types.h> +#include <nuttx/kmalloc.h> +#include <queue.h> +#include <assert.h> +#include <nuttx/arch.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(void *address) +{ + /* Check if this is an attempt to deallocate memory from + * an exception handler. + */ + + if (up_interrupt_context()) + { + /* Yes.. Delay the deallocation until a more appropriate time. */ + + uint32 savedState = irqsave(); + sq_addlast((sq_entry_t*)address, &g_delayeddeallocations); + irqrestore(savedState); + } + else + { + /* No.. just deallocate the memory now. */ + + kfree(address); + } +} |