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Diffstat (limited to 'nuttx/sched/pthread_getspecific.c')
-rw-r--r-- | nuttx/sched/pthread_getspecific.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/nuttx/sched/pthread_getspecific.c b/nuttx/sched/pthread_getspecific.c new file mode 100644 index 000000000..eeead14fa --- /dev/null +++ b/nuttx/sched/pthread_getspecific.c @@ -0,0 +1,123 @@ +/************************************************************************ + * sched/pthread_getspecific.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 <sched.h> +#include <errno.h> +#include <debug.h> + +#include "os_internal.h" +#include "pthread_internal.h" + +/************************************************************************ + * Definitions + ************************************************************************/ + +/************************************************************************ + * Private Type Declarations + ************************************************************************/ + +/************************************************************************ + * Global Variables + ************************************************************************/ + +/************************************************************************ + * Private Variables + ************************************************************************/ + +/************************************************************************ + * Private Functions + ************************************************************************/ + +/************************************************************************ + * Public Functions + ************************************************************************/ + +/************************************************************************ + * Name: pthread_getspecific + * + * Description: + * The pthread_getspecific() function returns the value currently + * bound to the specified key on behalf of the calling thread. + * + * The effect of calling pthread_getspecific() with with a key value + * not obtained from pthread_create() or after a key has been deleted + * with pthread_key_delete() is undefined. + * + * Parameters: + * key = The data key to get or set + * + * Return Value: + * The function pthread_getspecific() returns the thread-specific data + * associated with the given key. If no thread specific data is + * associated with the key, then the value NULL is returned. + * + * EINVAL - The key value is invalid. + * + * Assumptions: + * + * POSIX Compatibility: + * - Both calling pthread_setspecific() and pthread_getspecific() + * may be called from a thread-specific data destructor + * function. + * + ************************************************************************/ + +FAR void *pthread_getspecific(pthread_key_t key) +{ +#if CONFIG_NPTHREAD_KEYS > 0 + FAR _TCB *rtcb = (FAR _TCB*)g_readytorun.head; + FAR void *ret = NULL; + + /* Check if the key is valid. */ + + if (key < g_pthread_num_keys) + { + /* Return the stored value. */ + + ret = rtcb->pthread_data[key]; + } + + return ret; +#else + return NULL; +#endif +} + |