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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** GUIX Component */ |
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/** */ |
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/** System Management (System) */ |
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/** */ |
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/**************************************************************************/ |
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#define GX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "gx_api.h" |
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#include "gx_system.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _gx_system_lock PORTABLE C */ |
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/* 6.1 */ |
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/* AUTHOR */ |
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/* */ |
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/* Kenneth Maxwell, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function locks the GUIX system mutex */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* None */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* None */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* tx_mutex_get Grab a mutex */ |
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/* _tx_thread_identify Identify current thread */ |
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/* _gx_system_error_process Process an error */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* GUIX Internal Code */ |
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/* */ |
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/**************************************************************************/ |
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689246 |
VOID _gx_system_lock(VOID) |
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{ |
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#ifdef GX_THREADX_BINDING |
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UINT protection_status; |
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#endif |
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/* if the current thread already owns the GUIX system protection |
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then we don't need to lock again, just increment our nesting counter. |
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If no thread has yet locked GUIX or if the caller is not the owning |
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thread, then we need to request the gx_system_protect mutex. |
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*/ |
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✓✓ |
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if (_gx_system_lock_thread != GX_CURRENT_THREAD) |
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{ |
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#ifdef GX_THREADX_BINDING |
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protection_status = tx_mutex_get(&_gx_system_protect, TX_WAIT_FOREVER); |
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/* Determine if we successfully obtained the protection. */ |
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✓✓ |
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if (protection_status) |
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{ |
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/* Error obtaining protection - call system error handler. */ |
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_gx_system_error_process(GX_SYSTEM_PROTECTION_ERROR); |
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/* Return to exit the system thread. */ |
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return; |
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} |
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#else |
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GX_SYSTEM_MUTEX_LOCK; |
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#endif |
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/* save which thread owns the GUIX locked */ |
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_gx_system_lock_thread = GX_CURRENT_THREAD; |
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} |
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_gx_system_lock_nesting++; |
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} |
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