- #Iseries access for mac os x drivers
- #Iseries access for mac os x driver
- #Iseries access for mac os x free
Mach provides the following important advantages to Mac computing: It manages processor resources such as CPU usage and memory, handles scheduling, enforces memory protection, and implements a messaging-centered infrastructure for untyped interprocess communication, both local and remote. Much of what Mach provides is transparent to apps. Mach is at the heart of Darwin because it provides some of the most critical functions of the operating system.
#Iseries access for mac os x driver
The following sections describe some of the key features of the kernel and driver portions of Darwin. The kernel environment is built on top of Mach 3.0 and provides high-performance networking facilities and support for multiple, integrated file systems. The Kernelīeneath the appealing, easy-to-use interface of OS X is a rock-solid, UNIX-based foundation that is engineered for stability, reliability, and performance. I/O Video consists of the IOVideoDevice class on the kernel side (along with various related minor classes) that your driver should subclass, and a user space device interface for communicating with the driver.įor more information, see the IOVideoDevice.h header file in the Kernel framework. I/O Video replaces the QuickTime sequence grabber API as a means of getting video into OS X. I/O Video provides a kernel-level C++ programming interface for writing video capture device drivers.
For more information about the NSCache class, see NSCache Class Reference. The libcache library and Foundation framework’s NSCache class help you to create these purgeable caches.įor more information about the functions of the libcache library, see libcache Reference.
In the wider system context, your app can also help by creating caches that the operating system can simply purge on a priority basis as memory pressure necessitates. Your app should avoid potential paging overhead by actively managing its data caches, releasing them as soon as it no longer needs the cached data. Typically, this means paging cached data to and from relatively slow storage devices, sometimes even resulting in systemwide performance degradation.
#Iseries access for mac os x free
However, when caching demands exceed available memory, the system must free up memory as necessary to handle new demands. Aggressive caching is an important technique in maximizing app performance. The libcache API is a low-level purgeable caching API. To learn more about App Sandbox, read App Sandbox Design Guide. An app establishes a connection with one of its XPC services and sends it messages containing events that the service then handles.įor more on XPC Services, read Creating XPC Services in Daemons and Services Programming Guide. When the app is launched, the system automatically registers each XPC service it finds into the namespace visible to the app. When you create a connection, you associate it with a dispatch queue on which message traffic executes. XPC is integrated with Grand Central Dispatch (GCD). These advantages add up to making XPC the best technology for implementing privilege separation in an OS X app. In addition, an XPC service that you include with your app is accessible only by your app. Each service gets its own sandbox-specifically, it gets its own container and its own set of entitlements. You create an XPC service as an individual target in your Xcode project.
The component pieces that you create are called XPC services. Privilege separation, in turn, is a development strategy in which you divide an app into pieces according to the system resource access that each piece needs. XPC is an OS X interprocess communication technology that complements App Sandbox by enabling privilege separation. XPC Interprocess Communication and Services
#Iseries access for mac os x drivers
The following sections describe features in the Kernel and Device Drivers layer of OS X. OS X extends this low-level environment with several core infrastructure technologies that make it easier for you to develop software. The lowest layer of OS X includes the kernel, drivers, and BSD portions of the system and is based primarily on open source technologies.
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