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-rw-r--r--common/src/tx_semaphore_get.c232
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diff --git a/common/src/tx_semaphore_get.c b/common/src/tx_semaphore_get.c
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+/**************************************************************************/
+/* */
+/* Copyright (c) Microsoft Corporation. All rights reserved. */
+/* */
+/* This software is licensed under the Microsoft Software License */
+/* Terms for Microsoft Azure RTOS. Full text of the license can be */
+/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
+/* and in the root directory of this software. */
+/* */
+/**************************************************************************/
+
+
+/**************************************************************************/
+/**************************************************************************/
+/** */
+/** ThreadX Component */
+/** */
+/** Semaphore */
+/** */
+/**************************************************************************/
+/**************************************************************************/
+
+#define TX_SOURCE_CODE
+
+
+/* Include necessary system files. */
+
+#include "tx_api.h"
+#include "tx_trace.h"
+#include "tx_thread.h"
+#include "tx_semaphore.h"
+
+
+/**************************************************************************/
+/* */
+/* FUNCTION RELEASE */
+/* */
+/* _tx_semaphore_get PORTABLE C */
+/* 6.0 */
+/* AUTHOR */
+/* */
+/* William E. Lamie, Microsoft Corporation */
+/* */
+/* DESCRIPTION */
+/* */
+/* This function gets an instance from the specified counting */
+/* semaphore. */
+/* */
+/* INPUT */
+/* */
+/* semaphore_ptr Pointer to semaphore control block*/
+/* wait_option Suspension option */
+/* */
+/* OUTPUT */
+/* */
+/* status Completion status */
+/* */
+/* CALLS */
+/* */
+/* _tx_thread_system_suspend Suspend thread service */
+/* _tx_thread_system_ni_suspend Non-interruptable suspend thread */
+/* */
+/* CALLED BY */
+/* */
+/* Application Code */
+/* */
+/* RELEASE HISTORY */
+/* */
+/* DATE NAME DESCRIPTION */
+/* */
+/* 05-19-2020 William E. Lamie Initial Version 6.0 */
+/* */
+/**************************************************************************/
+UINT _tx_semaphore_get(TX_SEMAPHORE *semaphore_ptr, ULONG wait_option)
+{
+
+TX_INTERRUPT_SAVE_AREA
+
+TX_THREAD *thread_ptr;
+TX_THREAD *next_thread;
+TX_THREAD *previous_thread;
+UINT status;
+
+
+ /* Default the status to TX_SUCCESS. */
+ status = TX_SUCCESS;
+
+ /* Disable interrupts to get an instance from the semaphore. */
+ TX_DISABLE
+
+#ifdef TX_SEMAPHORE_ENABLE_PERFORMANCE_INFO
+
+ /* Increment the total semaphore get counter. */
+ _tx_semaphore_performance_get_count++;
+
+ /* Increment the number of attempts to get this semaphore. */
+ semaphore_ptr -> tx_semaphore_performance_get_count++;
+#endif
+
+ /* If trace is enabled, insert this event into the trace buffer. */
+ TX_TRACE_IN_LINE_INSERT(TX_TRACE_SEMAPHORE_GET, semaphore_ptr, wait_option, semaphore_ptr -> tx_semaphore_count, TX_POINTER_TO_ULONG_CONVERT(&thread_ptr), TX_TRACE_SEMAPHORE_EVENTS)
+
+ /* Log this kernel call. */
+ TX_EL_SEMAPHORE_GET_INSERT
+
+ /* Determine if there is an instance of the semaphore. */
+ if (semaphore_ptr -> tx_semaphore_count != ((ULONG) 0))
+ {
+
+ /* Decrement the semaphore count. */
+ semaphore_ptr -> tx_semaphore_count--;
+
+ /* Restore interrupts. */
+ TX_RESTORE
+ }
+
+ /* Determine if the request specifies suspension. */
+ else if (wait_option != TX_NO_WAIT)
+ {
+
+ /* Determine if the preempt disable flag is non-zero. */
+ if (_tx_thread_preempt_disable != ((UINT) 0))
+ {
+
+ /* Restore interrupts. */
+ TX_RESTORE
+
+ /* Suspension is not allowed if the preempt disable flag is non-zero at this point - return error completion. */
+ status = TX_NO_INSTANCE;
+ }
+ else
+ {
+
+ /* Prepare for suspension of this thread. */
+
+#ifdef TX_SEMAPHORE_ENABLE_PERFORMANCE_INFO
+
+ /* Increment the total semaphore suspensions counter. */
+ _tx_semaphore_performance_suspension_count++;
+
+ /* Increment the number of suspensions on this semaphore. */
+ semaphore_ptr -> tx_semaphore_performance_suspension_count++;
+#endif
+
+ /* Pickup thread pointer. */
+ TX_THREAD_GET_CURRENT(thread_ptr)
+
+ /* Setup cleanup routine pointer. */
+ thread_ptr -> tx_thread_suspend_cleanup = &(_tx_semaphore_cleanup);
+
+ /* Setup cleanup information, i.e. this semaphore control
+ block. */
+ thread_ptr -> tx_thread_suspend_control_block = (VOID *) semaphore_ptr;
+
+#ifndef TX_NOT_INTERRUPTABLE
+
+ /* Increment the suspension sequence number, which is used to identify
+ this suspension event. */
+ thread_ptr -> tx_thread_suspension_sequence++;
+#endif
+
+ /* Setup suspension list. */
+ if (semaphore_ptr -> tx_semaphore_suspended_count == TX_NO_SUSPENSIONS)
+ {
+
+ /* No other threads are suspended. Setup the head pointer and
+ just setup this threads pointers to itself. */
+ semaphore_ptr -> tx_semaphore_suspension_list = thread_ptr;
+ thread_ptr -> tx_thread_suspended_next = thread_ptr;
+ thread_ptr -> tx_thread_suspended_previous = thread_ptr;
+ }
+ else
+ {
+
+ /* This list is not NULL, add current thread to the end. */
+ next_thread = semaphore_ptr -> tx_semaphore_suspension_list;
+ thread_ptr -> tx_thread_suspended_next = next_thread;
+ previous_thread = next_thread -> tx_thread_suspended_previous;
+ thread_ptr -> tx_thread_suspended_previous = previous_thread;
+ previous_thread -> tx_thread_suspended_next = thread_ptr;
+ next_thread -> tx_thread_suspended_previous = thread_ptr;
+ }
+
+ /* Increment the number of suspensions. */
+ semaphore_ptr -> tx_semaphore_suspended_count++;
+
+ /* Set the state to suspended. */
+ thread_ptr -> tx_thread_state = TX_SEMAPHORE_SUSP;
+
+#ifdef TX_NOT_INTERRUPTABLE
+
+ /* Call actual non-interruptable thread suspension routine. */
+ _tx_thread_system_ni_suspend(thread_ptr, wait_option);
+
+ /* Restore interrupts. */
+ TX_RESTORE
+#else
+
+ /* Set the suspending flag. */
+ thread_ptr -> tx_thread_suspending = TX_TRUE;
+
+ /* Setup the timeout period. */
+ thread_ptr -> tx_thread_timer.tx_timer_internal_remaining_ticks = wait_option;
+
+ /* Temporarily disable preemption. */
+ _tx_thread_preempt_disable++;
+
+ /* Restore interrupts. */
+ TX_RESTORE
+
+ /* Call actual thread suspension routine. */
+ _tx_thread_system_suspend(thread_ptr);
+#endif
+
+ /* Return the completion status. */
+ status = thread_ptr -> tx_thread_suspend_status;
+ }
+ }
+ else
+ {
+
+ /* Restore interrupts. */
+ TX_RESTORE
+
+ /* Immediate return, return error completion. */
+ status = TX_NO_INSTANCE;
+ }
+
+ /* Return completion status. */
+ return(status);
+}
+
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