Module std::sys::unix::thread_parking::darwin

Thread parking for Darwin-based systems.

Darwin actually has futex syscalls (__ulock_wait/__ulock_wake), but they cannot be used in std because they are non-public (their use will lead to rejection from the App Store) and because they are only available starting with macOS version 10.12, even though the minimum target version is 10.7.

Therefore, we need to look for other synchronization primitives. Luckily, Darwin supports semaphores, which allow us to implement the behaviour we need with only one primitive (as opposed to a mutex-condvar pair). We use the semaphore provided by libdispatch, as the underlying Mach semaphore is only dubiously public.

Structs

• Parker

Constants

• DISPATCH_TIME_FOREVER 🔒
• DISPATCH_TIME_NOW 🔒
• EMPTY 🔒
• NOTIFIED 🔒
• PARKED 🔒

Functions

• dispatch_release 🔒 ^⚠
• dispatch_semaphore_create 🔒 ^⚠
• dispatch_semaphore_signal 🔒 ^⚠
• dispatch_semaphore_wait 🔒 ^⚠
• dispatch_time 🔒 ^⚠

Type Definitions

• dispatch_semaphore_t 🔒
• dispatch_time_t 🔒