I'm encountering an issue with 3 tasks running on SimulIDE. 2 of them share the same resource. A has priority higher than C (they 2 share the resource), but as soon as C requests the resource, it ...

My app is working well and I didn't get this error on Xcode 13.4, Is it Xcode 14 beta bug or I'm doing some bad threading?! Thread running at QOS_CLASS_USER_INITIATED waiting on a lower QoS thread ...

I've read the documentation about priority inversion in win32. It seems that the operating system's scheduler handles this case by boosting a waiting thread's priority randomly. Does that mean that ...

Here is the scenario I am not sure will be the problem. Foo() { TakeMutex() //some critical code GiveMutex() } Task A priority 5 Task B priority 1 TaskB{ Foo() } TaskA{ Foo() } now in some ...

My project has a practice of reducing the priority of the thread while writing to a file and changing it back after the write operation is complete. This is done because the file write operation could ...

I'm trying to implement an unprivileged test case for unbounded priority inversion in the absence of priority inheritance mutexes, using SCHED_IDLE. The test works with SCHED_FIFO and different ...

Priority Inheritance is a feature of Keil RTX (and others) to prevent priority inversion. If a high priority task is trying to obtain the mutex already obtained by a low level task, priority ...

In Priority based scheduling, I came across the problem of Priority inversion which is a higher priority process is forced to wait for the lower priority task. One possible scenario is, consider ...

Assume you have two processes, P1 and P2. P1 has a high priority, P2 has a low priority. P1 and P2 have one shared semaphore (i.e., they both carry out waits and posts on the same semaphore). The ...

I'm using an ARM Cortex-M4 MCU. If I have an interrupt handler for a GPIO at priority 2 and an SPI driver at priority 3 (i.e., lower priority than the GPIO's), and I call a (blocking) SPI read from ...

Short version: How do I release multiple locks from a single thread, without being preempted halfway through? I have a program which is designed to run on an N-core machine. It consists of one main ...

In the below scenario how the priority of the task t1 will change when the locks are released, assuming Sem_Take() and Sem_Give() are lock and release method. I understand that using priority ceiling ...

Priority inversion is a problem which can occur during scheduling of threads/processes, due to priorities associated with them. Priority inversion is a problematic scenario in scheduling in which a ...

I am wondering does happen-before relationship such as volatile variable or finally block to release a lock have something to do priority inversion? I understand that these impose a happen-before ...

In this documentation of POSIX mutex protocols - http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_mutexattr_getprotocol.html# - we can read following section: While a thread is ...