diff options
author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-02-17 23:21:28 +0000 |
---|---|---|
committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-02-17 23:21:28 +0000 |
commit | e3940eb2080711edac189cca3f642ee89dc215f2 (patch) | |
tree | 1c390958fae49e34dce698b175487e6d4681e540 /nuttx/sched/pthread_keycreate.c | |
parent | 2223612deb2cc6322992f8595b6d6f86fcb53ae1 (diff) | |
download | px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.tar.gz px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.tar.bz2 px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.zip |
NuttX RTOS
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3
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..bda51e53a --- /dev/null +++ b/nuttx/sched/pthread_keycreate.c @@ -0,0 +1,135 @@ +/************************************************************ + * pthread_keycreate.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 <sched.h> +#include <errno.h> +#include <debug.h> +#include "pthread_internal.h" + +/************************************************************ + * Definitions + ************************************************************/ + +/************************************************************ + * Private Type Declarations + ************************************************************/ + +/************************************************************ + * Global Variables + ************************************************************/ + +/************************************************************ + * Private Variables + ************************************************************/ + +/************************************************************ + * Private Functions + ************************************************************/ + +/************************************************************ + * Public Functions + ************************************************************/ + +/************************************************************ + * Function: 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 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 be + * returned 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(pthread_key_t *key, void (*destructor)(void*)) +{ + 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; +} |