How can the maximum number of concurrently executing threads in a system be determined?

The maximum number of concurrently executing threads in a system depends on hardware resources and OS limitations.

In iOS, you can obtain information about the number of available processor cores, which indirectly affects the number of threads that can be effectively executed simultaneously:

let processorCount = ProcessInfo.processInfo.processorCount

However, iOS does not provide a direct API to get the maximum number of threads, as the system manages scheduling and limitations itself.

If you need to find out system limits, you can use POSIX functions, such as sysconf:

import Foundation

let maxThreads = sysconf(_SC_THREAD_THREADS_MAX)
print("Maximum number of threads: \(maxThreads)")

This value indicates the maximum allowed number of threads for a process.

Thus, to determine the maximum number of threads that can run simultaneously, system calls can be used, but in iOS, system scheduling and optimization are usually relied upon.