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When the garbage collector runs, it does not clean up all of the garbage in the entire heap It cleans up only the garbage created by the process that launched it When a process terminates, all memory consumed by the process, including that held by objects and internal JVM structures, is freed All les are created, deleted, read, and written by Java applications, using classes in the javaio package such as File and FileOutputStream All memory occupied by the le system, including le data and directories, is allocated from the same heap used for the storage of Java objects When the le system manager allocates memory, it tags the memory to indicate that it is a part of the le system This prevents memory held by le system structures from being reclaimed by the garbage collector Memory used by the le system manager is explicitly freed during le deletion operations The fact that le system data structures are allocated from the same heap as Java objects may seem odd at rst, but there is no local hard disk associated with TINI Using the heap, which is contained within fast static RAM, has the advantage that le write operations are as fast as le read operations With most other rewritable memory technologies, writes would be much slower than reads The downside to this approach is that TINI hardware implementations that do not provide the static RAM nonvolatizing circuitry, shown in Figure 13, lose le system data when power is removed from the system File system data will remain intact even in the absence of main system power in systems that nonvolatize the static RAM The other obvious disadvantage is that as the le system grows, it consumes more memory from the heap, leaving less memory available for Java object creation The le system can contain arbitrary data les as well as executable binary images All executable les are assumed to be binary images of Java applications that can be executed directly by the JVM Large les are fragmented into smaller 512-byte blocks and therefore occupy a noncontiguous range of memory Before an executable le can be interpreted by the JVM, it must be contiguous Therefore, the rst time an executable le is run, the le system manager defragments the le in order to generate a contiguous binary image The memory consumed by the original le fragments is freed From this point forward the le can be executed without the overhead of defragmentation In the next chapter we ll take a much higher-level look at the le system The I/O Subsystem The I/O subsystem is divided into two major components: network and non-network I/O Referring to CAN and 1-Wire as nonnetworking I/O can be somewhat confusing because both are in fact networking technologies However for the sake of this discussion, network I/O refers
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strictly to big world TCP/IP (Transmission Control Protocol/Internet Protocol) networking Both the TCP/IP stack and the I/O manager are implemented as independent lightweight kernel processes9 These processes are driven by a 4-millisecond system timer tick The I/O manager controls all non-networking device drivers I/O requests generated from application code all pass through the I/O manager to the appropriate driver and back Certain I/O requests go directly to attached hardware devices For example, there are no built-in drivers to communicate with arbitrary devices attached to the parallel expansion bus In this case, the Java application is responsible for managing all of the low-level details of communicating with the device The TCP/IP network protocol stack is one of the largest blocks of native code in the runtime environment It provides much of the same networking capability found on larger platforms and is suf ciently rich in functionality to support a full implementation of the javanet package The protocol stack supports multiple network interfaces, including Ethernet, for high-speed local area networking and PPP (PPP Point-to-Point Protocol) over a serial link for remote dial-up networking using an analog modem The Ethernet interface is managed by a separate device driver that performs all communication with the Ethernet controller PPP is a little different in that it actually relies on a lower-level serial port driver to deliver network messages to the physical communications port
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