Apple记录的iOS底层用户级API

Question

What is the equivalent of Win32's Kernel32 on iOS?

Otherwise put: What is the lowest-level, fully-documented (by Apple), stable, supported, userland API on iOS for things like:

• Managing memory
• Async file I/O
• Thread management
• Wrappers for synchronization primitives & concurrency constructs

So far what I have found has been a mix of a externally-documented mach and BSD API's together miscellaneous headers (OSMalloc.h, for example). Additionally, the link Apple provides on it's Kernel Programming Guide to the "Up-to-date versions of the Mach 3 APIs" is dead

Answer 1

Start with Apple's opensource XNU project . Look to use:

mach ( impl )

• Thread management
• IPC
• Virtual memory
• Concurrency constructs
• Timing

BSD

• POSIX implementation
• GCD
• Async file IO via kqueue/kevent
• Networking

Clang language extensions

• Wrappers for ldrex, ldaex, strex, stlex, clrex, dmb, dsb, isb