By Richard Harrison
Richard Harrison’s current books are the bestsellers within the Symbian Press Portfolio. His most modern booklet, co-written with Mark Shackman is the successor to "Symbian OS C++ for cellphones" Volumes One and . Written within the similar variety because the earlier volumes, this can be set to be one other gem within the series.
The present fabric from the volumes should be mixed, with factors and instance code up-to-date to mirror the advent of Symbian OS v9. New and simplified instance program should be brought, as a way to be used in the course of the book. The reference and conception part specifically units this booklet except the contest and enhances different books being proposed at this time.
Anyone trying to find an intensive perception into Symbian OS C++ ahead of relocating onto specialize on specific Symbian OS telephones desire this book! it is going to now not train humans tips on how to application in C++, however it will strengthen the ideas at the back of constructing purposes in Symbian OS C++, and more.
This leading edge new ebook covers Symbian OS basics, center strategies and UI.
Key highlights include:
A speedy advisor to Kernel
Multi-User video games
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Extra resources for Symbian OS C++ for Mobile Phones (Symbian Press)
This means that, while a thread is executing kernel-side (which may be blocking in the kernel), its system call may safely be interrupted. This ﬂexibility is possible because each user thread has two stacks, a user stack for user-side operation and a kernel stack that is used when the thread has crossed to the kernel side. This gives much higher pre-emptibility, leading to much shorter latency during interrupts. Executive calls may access and even modify kernel-side objects, as well as offer privileged access to hardware.
Threading and Process Model As discussed already, Symbian OS is a pre-emptive multitasking operating system whose kernel runs in privileged mode, while all other tasks run in SYMBIAN OS BASICS 23 non-privileged mode [Furber 2000]. All access to memory and memorymapped hardware is protected through use of the MMU by the operating system. Kernel-side code can access all the memory belonging to any program, whereas a non-privileged program can directly access only the memory speciﬁcally mapped to it.
In a microkernel OS such as Symbian OS, the concurrency of the servers hosting the requested services gives that asynchronicity for free. Within the single thread of a Symbian OS application, the programmer only needs to distribute requests to servers running concurrently in separate threads. 6 Active objects in concurrent processes Active objects ﬁt very naturally into such an environment. 5, all Symbian OS active objects run under the control of the Active Scheduler, which is an AO queue management loop that waits on a special thread semaphore.
Symbian OS C++ for Mobile Phones (Symbian Press) by Richard Harrison