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115 lines
3.8 KiB
115 lines
3.8 KiB
/**************************************************************************** |
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* sched/env_share.c |
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* |
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* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <nuttx/config.h> |
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#ifndef CONFIG_DISABLE_ENVIRON |
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#include <sched.h> |
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#include <errno.h> |
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#include "os_internal.h" |
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#include "env_internal.h" |
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/**************************************************************************** |
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* Private Data |
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****************************************************************************/ |
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/**************************************************************************** |
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* Public Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Function: env_share |
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* |
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* Description: |
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* Increment the reference count on the internal environment structure of |
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* a task. This is the action that is performed when a new pthread is |
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* created: The new pthread shares the environment with its parent. |
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* |
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* Parameters: |
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* ptcb The new TCB to receive the shared environment. |
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* |
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* Return Value: |
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* A pointer to a specified TCB's environment structure with an incremented |
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* reference count. |
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* |
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* Assumptions: |
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* Not called from an interrupt handler. |
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* |
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****************************************************************************/ |
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int env_share(FAR _TCB *ptcb) |
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{ |
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int ret = OK; |
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if (!ptcb) |
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{ |
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ret = -EINVAL; |
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} |
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else |
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{ |
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FAR _TCB *parent = (FAR _TCB*)g_readytorun.head; |
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environ_t *envp = parent->envp; |
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/* Pre-emption must be disabled throughout the following because the |
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* environment is shared. |
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*/ |
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sched_lock(); |
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/* Does the parent task have an environment? */ |
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if (envp) |
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{ |
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/* Yes.. increment the reference count on the environment */ |
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envp->ev_crefs++; |
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} |
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/* Then share the environment */ |
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ptcb->envp = envp; |
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sched_unlock(); |
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} |
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return ret; |
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} |
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#endif /* CONFIG_DISABLE_ENVIRON */ |
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