TAILIEUCHUNG - Real-Time Embedded Multithreading Using ThreadX and MIPS- P20

Real-Time Embedded Multithreading Using ThreadX and MIPS- P20:Although the history of embedded systems is relatively short, 1 the advances and successes of this fi eld have been profound. Embedded systems are found in a vast array of applications such as consumer electronics, “ smart ” devices, communication equipment, automobiles, desktop computers, and medical equipment. | G-4 Appendix G TX_SEMAPHORE_ERROR 0x0C Invalid semaphore pointer. Either the pointer is NULL or the semaphore has already been created. TX_CALLER_ERROR 0x13 Invalid caller of this service. Allowed From Initialization and threads Preemption Possible No Example TX_SEMAPHORE my_semaphore UINT status Create a counting semaphore with an initial value of 1. This is typically the technique used to create a binary semaphore. Binary semaphores are used to provide protection over a common resource. status tx_semaphore_create my_semaphore my_semaphore_name 1 If status equals TX_SUCCESS my_semaphore is ready for use. tx_semaphore_delete Delete a counting semaphore Prototype UINT tx_semaphore_delete TX_SEMAPHORE semaphore_ptr Description This service deletes the specified counting semaphore. All threads suspended waiting for an instance of this semaphore are resumed and receive a TX_DELETED return status. WARNING It is the application s responsibility to prevent use of a deleted semaphore. se purchase PDF Ple on to remove this watermark. Counting Semaphore Services G-5 Parameter semaphore_ptr Pointer to a previously created semaphore s Control Block. Return Values TX_SUCCESS2 TX_SEMAPHORE_ERROR TX_CALLER_ERROR 0x00 0x0C 0x13 Successful counting semaphore deletion. Invalid counting semaphore pointer. Invalid caller of this service. Allowed From Threads Preemption Possible Yes Example TX_SEMAPHORE my_semaphore UINT status Delete counting semaphore. Assume that the counting semaphore has already been created. status tx_semaphore_delete my_semaphore If status equals TX_SUCCESS the counting semaphore is deleted. tx_semaphore_get Get an instance from a counting semaphore Prototype UINT tx_semaphore_get TX_SEMAPHORE semaphore_ptr ULONG wait_option 2This value is not affected by the TX_DISABLE_ERROR_CHECKING define that is used to disable API error checking. Please purchase PDF Split-Merge on o G-6 Appendix G Description .

Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.