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Diffstat (limited to 'nuttx/sched/pthread_keycreate.c')
-rw-r--r-- | nuttx/sched/pthread_keycreate.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/nuttx/sched/pthread_keycreate.c b/nuttx/sched/pthread_keycreate.c new file mode 100644 index 000000000..7579e4c11 --- /dev/null +++ b/nuttx/sched/pthread_keycreate.c @@ -0,0 +1,135 @@ +/**************************************************************************** + * sched/pthread_keycreate.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 "pthread_internal.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: pthread_key_create + * + * Description: + * This function creates a thread-specific data key visible to all threads + * in the system. Although the same key value may be used by different + * threads, the values bound to the key by pthread_setspecific() are + * maintained on a per-thread basis and persist for the life of the calling + * thread. + * + * Upon key creation, the value NULL will be associated with the new key + * in all active threads. Upon thread creation, the value NULL will be + * associated with all defined keys in the new thread. + * + * Parameters: + * key = A pointer to the key to create. + * destructor = An optional destructor() function that may be associated + * with each key that is invoked when a thread exits. However, this + * argument is ignored in the current implementation. + * + * Return Value: + * If successful, the pthread_key_create() function will store the newly + * created key value at *key and return zero (OK). Otherwise, an error + * number will bereturned to indicate the error: + * + * EAGAIN - The system lacked sufficient resources to create another + * thread-specific data key, or the system-imposed limit on the total + * number of keys pers process {PTHREAD_KEYS_MAX} has been exceeded + * ENONMEM - Insufficient memory exists to create the key. + * + * Assumptions: + * + * POSIX Compatibility: + * - The present implementation ignores the destructor argument. + * + ****************************************************************************/ + +int pthread_key_create(FAR pthread_key_t *key, CODE void (*destructor)(void*)) +{ +#if CONFIG_NPTHREAD_KEYS > 0 + int ret = EAGAIN; + + /* Check if we have exceeded the system-defined number of keys. */ + + if (g_pthread_num_keys < PTHREAD_KEYS_MAX) + { + /* Return the key value */ + + *key = g_pthread_num_keys; + + /* Increment the count of global keys. */ + + g_pthread_num_keys++; + + /* Return success. */ + + ret = OK; + } + + return ret; +#else + return ENOSYS; +#endif +} |