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Diffstat (limited to 'nuttx/sched/sched_gettcb.c')
-rw-r--r-- | nuttx/sched/sched_gettcb.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/nuttx/sched/sched_gettcb.c b/nuttx/sched/sched_gettcb.c new file mode 100644 index 000000000..1e50ef50f --- /dev/null +++ b/nuttx/sched/sched_gettcb.c @@ -0,0 +1,107 @@ +/**************************************************************************** + * sched/sched_gettcb.c + * + * Copyright (C) 2007, 2009, 2011 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 <sys/types.h> + +#include <sched.h> + +#include "os_internal.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: sched_gettcb + * + * Description: + * Given a task ID, this function will return + * the a pointer to the corresponding TCB (or NULL if there + * is no such task ID). + * + ****************************************************************************/ + +FAR _TCB *sched_gettcb(pid_t pid) +{ + FAR _TCB *ret = NULL; + int hash_ndx; + + /* Verify that the PID is within range */ + + if (pid >= 0 ) + { + /* Get the hash_ndx associated with the pid */ + + hash_ndx = PIDHASH(pid); + + /* Verify that the correct TCB was found. */ + + if (pid == g_pidhash[hash_ndx].pid) + { + /* Return the TCB associated with this pid (if any) */ + + ret = g_pidhash[hash_ndx].tcb; + } + } + + /* Return the TCB. */ + + return ret; +} + |