225 lines
9.1 KiB
C
225 lines
9.1 KiB
C
/**************************************************************************/
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/* */
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/* Copyright (c) Microsoft Corporation. All rights reserved. */
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/* */
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/* This software is licensed under the Microsoft Software License */
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/* Terms for Microsoft Azure RTOS. Full text of the license can be */
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/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
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/* and in the root directory of this software. */
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/* */
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/**************************************************************************/
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/**************************************************************************/
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/**************************************************************************/
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/** */
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/** ThreadX Component */
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/** */
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/** Semaphore */
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/** */
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/**************************************************************************/
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/**************************************************************************/
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#define TX_SOURCE_CODE
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/* Include necessary system files. */
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#include "tx_api.h"
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#include "tx_trace.h"
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#include "tx_thread.h"
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#include "tx_semaphore.h"
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/**************************************************************************/
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/* */
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/* FUNCTION RELEASE */
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/* */
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/* _tx_semaphore_put PORTABLE C */
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/* 6.1 */
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/* AUTHOR */
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/* */
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/* William E. Lamie, Microsoft Corporation */
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/* */
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/* DESCRIPTION */
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/* */
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/* This function puts an instance into the specified counting */
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/* semaphore. */
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/* */
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/* INPUT */
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/* */
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/* semaphore_ptr Pointer to semaphore control block*/
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/* */
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/* OUTPUT */
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/* */
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/* TX_SUCCESS Success completion status */
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/* */
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/* CALLS */
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/* */
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/* _tx_thread_system_resume Resume thread service */
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/* _tx_thread_system_ni_resume Non-interruptable resume thread */
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/* */
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/* CALLED BY */
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/* */
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/* Application Code */
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/* */
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/* RELEASE HISTORY */
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/* */
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/* DATE NAME DESCRIPTION */
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/* */
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/* 05-19-2020 William E. Lamie Initial Version 6.0 */
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/* 09-30-2020 Yuxin Zhou Modified comment(s), */
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/* resulting in version 6.1 */
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/* */
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/**************************************************************************/
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UINT _tx_semaphore_put(TX_SEMAPHORE *semaphore_ptr)
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{
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TX_INTERRUPT_SAVE_AREA
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#ifndef TX_DISABLE_NOTIFY_CALLBACKS
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VOID (*semaphore_put_notify)(struct TX_SEMAPHORE_STRUCT *notify_semaphore_ptr);
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#endif
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TX_THREAD *thread_ptr;
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UINT suspended_count;
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TX_THREAD *next_thread;
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TX_THREAD *previous_thread;
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/* Disable interrupts to put an instance back to the semaphore. */
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TX_DISABLE
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#ifdef TX_SEMAPHORE_ENABLE_PERFORMANCE_INFO
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/* Increment the total semaphore put counter. */
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_tx_semaphore_performance_put_count++;
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/* Increment the number of puts on this semaphore. */
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semaphore_ptr -> tx_semaphore_performance_put_count++;
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#endif
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/* If trace is enabled, insert this event into the trace buffer. */
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TX_TRACE_IN_LINE_INSERT(TX_TRACE_SEMAPHORE_PUT, semaphore_ptr, semaphore_ptr -> tx_semaphore_count, semaphore_ptr -> tx_semaphore_suspended_count, TX_POINTER_TO_ULONG_CONVERT(&thread_ptr), TX_TRACE_SEMAPHORE_EVENTS)
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/* Log this kernel call. */
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TX_EL_SEMAPHORE_PUT_INSERT
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/* Pickup the number of suspended threads. */
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suspended_count = semaphore_ptr -> tx_semaphore_suspended_count;
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/* Determine if there are any threads suspended on the semaphore. */
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if (suspended_count == TX_NO_SUSPENSIONS)
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{
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/* Increment the semaphore count. */
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semaphore_ptr -> tx_semaphore_count++;
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#ifndef TX_DISABLE_NOTIFY_CALLBACKS
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/* Pickup the application notify function. */
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semaphore_put_notify = semaphore_ptr -> tx_semaphore_put_notify;
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#endif
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/* Restore interrupts. */
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TX_RESTORE
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#ifndef TX_DISABLE_NOTIFY_CALLBACKS
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/* Determine if notification is required. */
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if (semaphore_put_notify != TX_NULL)
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{
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/* Yes, call the appropriate notify callback function. */
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(semaphore_put_notify)(semaphore_ptr);
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}
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#endif
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}
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else
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{
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/* A thread is suspended on this semaphore. */
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/* Pickup the pointer to the first suspended thread. */
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thread_ptr = semaphore_ptr -> tx_semaphore_suspension_list;
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/* Remove the suspended thread from the list. */
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/* See if this is the only suspended thread on the list. */
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suspended_count--;
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if (suspended_count == TX_NO_SUSPENSIONS)
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{
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/* Yes, the only suspended thread. */
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/* Update the head pointer. */
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semaphore_ptr -> tx_semaphore_suspension_list = TX_NULL;
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}
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else
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{
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/* At least one more thread is on the same expiration list. */
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/* Update the list head pointer. */
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next_thread = thread_ptr -> tx_thread_suspended_next;
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semaphore_ptr -> tx_semaphore_suspension_list = next_thread;
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/* Update the links of the adjacent threads. */
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previous_thread = thread_ptr -> tx_thread_suspended_previous;
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next_thread -> tx_thread_suspended_previous = previous_thread;
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previous_thread -> tx_thread_suspended_next = next_thread;
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}
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/* Decrement the suspension count. */
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semaphore_ptr -> tx_semaphore_suspended_count = suspended_count;
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/* Prepare for resumption of the first thread. */
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/* Clear cleanup routine to avoid timeout. */
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thread_ptr -> tx_thread_suspend_cleanup = TX_NULL;
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#ifndef TX_DISABLE_NOTIFY_CALLBACKS
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/* Pickup the application notify function. */
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semaphore_put_notify = semaphore_ptr -> tx_semaphore_put_notify;
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#endif
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/* Put return status into the thread control block. */
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thread_ptr -> tx_thread_suspend_status = TX_SUCCESS;
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#ifdef TX_NOT_INTERRUPTABLE
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/* Resume the thread! */
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_tx_thread_system_ni_resume(thread_ptr);
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/* Restore interrupts. */
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TX_RESTORE
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#else
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/* Temporarily disable preemption. */
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_tx_thread_preempt_disable++;
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/* Restore interrupts. */
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TX_RESTORE
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/* Resume thread. */
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_tx_thread_system_resume(thread_ptr);
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#endif
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#ifndef TX_DISABLE_NOTIFY_CALLBACKS
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/* Determine if notification is required. */
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if (semaphore_put_notify != TX_NULL)
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{
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/* Yes, call the appropriate notify callback function. */
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(semaphore_put_notify)(semaphore_ptr);
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}
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#endif
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}
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/* Return successful completion. */
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return(TX_SUCCESS);
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}
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