/***************************************************************************/ /* Copyright (c) 2024 Microsoft Corporation */ /* Copyright (c) 2026 Eclipse ThreadX contributors */ /* */ /* This program and the accompanying materials are made available under */ /* the terms of the MIT License which is available at */ /* https://opensource.org/licenses/MIT. */ /* */ /* SPDX-License-Identifier: MIT */ /***************************************************************************/ /* This is a small demo of the high-performance ThreadX kernel. It includes examples of six threads of different priorities, using a message queue, semaphore, and an event flags group. */ #include "tx_api.h" #define DEMO_STACK_SIZE 1024 #define DEMO_QUEUE_SIZE 10 /* Define the ThreadX object control blocks... */ TX_THREAD thread_0; TX_THREAD thread_1; TX_THREAD thread_2; TX_THREAD thread_3; TX_THREAD thread_4; TX_THREAD thread_5; TX_QUEUE queue_0; TX_SEMAPHORE semaphore_0; TX_EVENT_FLAGS_GROUP event_flags_0; /* Define the counters used in the demo application... */ ULONG thread_0_counter; ULONG thread_1_counter; ULONG thread_1_messages_sent; ULONG thread_2_counter; ULONG thread_2_messages_received; ULONG thread_3_counter; ULONG thread_4_counter; ULONG thread_5_counter; /* Define the thread stacks. */ UCHAR thread_0_stack[DEMO_STACK_SIZE]; UCHAR thread_1_stack[DEMO_STACK_SIZE]; UCHAR thread_2_stack[DEMO_STACK_SIZE]; UCHAR thread_3_stack[DEMO_STACK_SIZE]; UCHAR thread_4_stack[DEMO_STACK_SIZE]; UCHAR thread_5_stack[DEMO_STACK_SIZE]; /* Define the queue area. */ UCHAR queue_0_area[DEMO_QUEUE_SIZE*sizeof(ULONG)]; /* Define thread prototypes. */ void thread_0_entry(ULONG thread_input); void thread_1_entry(ULONG thread_input); void thread_2_entry(ULONG thread_input); void thread_3_and_4_entry(ULONG thread_input); void thread_5_entry(ULONG thread_input); volatile unsigned int bootloop; /* Define main entry point. */ int main() { /* Enter the ThreadX kernel. */ tx_kernel_enter(); } /* Define what the initial system looks like. */ void tx_application_define(void *first_unused_memory) { /* Create the main thread. */ tx_thread_create(&thread_0, "thread 0", thread_0_entry, 0, thread_0_stack, DEMO_STACK_SIZE, 1, 1, TX_NO_TIME_SLICE, TX_AUTO_START); /* Create threads 1 and 2. These threads pass information through a ThreadX message queue. It is also interesting to note that these threads have a time slice. */ tx_thread_create(&thread_1, "thread 1", thread_1_entry, 1, thread_1_stack, DEMO_STACK_SIZE, 16, 16, 4, TX_AUTO_START); tx_thread_create(&thread_2, "thread 2", thread_2_entry, 2, thread_2_stack, DEMO_STACK_SIZE, 16, 16, 4, TX_AUTO_START); /* Create threads 3 and 4. These threads compete for a ThreadX counting semaphore. An interesting thing here is that both threads share the same instruction area. */ tx_thread_create(&thread_3, "thread 3", thread_3_and_4_entry, 3, thread_3_stack, DEMO_STACK_SIZE, 8, 8, TX_NO_TIME_SLICE, TX_AUTO_START); tx_thread_create(&thread_4, "thread 4", thread_3_and_4_entry, 4, thread_4_stack, DEMO_STACK_SIZE, 8, 8, TX_NO_TIME_SLICE, TX_AUTO_START); /* Create thread 5. This thread simply pends on an event flag which will be set by thread_0. */ tx_thread_create(&thread_5, "thread 5", thread_5_entry, 5, thread_5_stack, DEMO_STACK_SIZE, 4, 4, TX_NO_TIME_SLICE, TX_AUTO_START); /* Create the message queue shared by threads 1 and 2. */ tx_queue_create(&queue_0, "queue 0", TX_1_ULONG, queue_0_area, DEMO_QUEUE_SIZE*sizeof(ULONG)); /* Create the semaphore used by threads 3 and 4. */ tx_semaphore_create(&semaphore_0, "semaphore 0", 1); /* Create the event flags group used by threads 1 and 5. */ tx_event_flags_create(&event_flags_0, "event flags 0"); } /* Define the test threads. */ void thread_0_entry(ULONG thread_input) { UINT status; /* This thread simply sits in while-forever-sleep loop. */ while(1) { /* Increment the thread counter. */ thread_0_counter++; /* Sleep for 10 ticks. */ tx_thread_sleep(10); /* Set event flag 0 to wakeup thread 5. */ status = tx_event_flags_set(&event_flags_0, 0x1, TX_OR); /* Check status. */ if (status != TX_SUCCESS) break; } } void thread_1_entry(ULONG thread_input) { UINT status; /* This thread simply sends messages to a queue shared by thread 2. */ while(1) { /* Increment the thread counter. */ thread_1_counter++; /* Send message to queue 0. */ status = tx_queue_send(&queue_0, &thread_1_messages_sent, TX_WAIT_FOREVER); /* Check completion status. */ if (status != TX_SUCCESS) break; /* Increment the message sent. */ thread_1_messages_sent++; } } void thread_2_entry(ULONG thread_input) { ULONG received_message; UINT status; /* This thread retrieves messages placed on the queue by thread 1. */ while(1) { /* Increment the thread counter. */ thread_2_counter++; /* Retrieve a message from the queue. */ status = tx_queue_receive(&queue_0, &received_message, TX_WAIT_FOREVER); /* Check completion status and make sure the message is what we expected. */ if ((status != TX_SUCCESS) || (received_message != thread_2_messages_received)) break; /* Otherwise, all is okay. Increment the received message count. */ thread_2_messages_received++; } } void thread_3_and_4_entry(ULONG thread_input) { UINT status; /* This function is executed from thread 3 and thread 4. As the loop below shows, these function compete for ownership of semaphore_0. */ while(1) { /* Increment the thread counter. */ if (thread_input == 3) thread_3_counter++; else thread_4_counter++; /* Get the semaphore with suspension. */ status = tx_semaphore_get(&semaphore_0, TX_WAIT_FOREVER); /* Check status. */ if (status != TX_SUCCESS) break; /* Sleep for 2 ticks to hold the semaphore. */ tx_thread_sleep(2); /* Release the semaphore. */ status = tx_semaphore_put(&semaphore_0); /* Check status. */ if (status != TX_SUCCESS) break; } } void thread_5_entry(ULONG thread_input) { UINT status; ULONG actual_flags; /* This thread simply waits for an event in a forever loop. */ while(1) { /* Increment the thread counter. */ thread_5_counter++; /* Wait for event flag 0. */ status = tx_event_flags_get(&event_flags_0, 0x1, TX_OR_CLEAR, &actual_flags, TX_WAIT_FOREVER); /* Check status. */ if ((status != TX_SUCCESS) || (actual_flags != 0x1)) break; } }