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9 If a corrupt heap is detected on bootup, the memory manager will clear the heap and re-initialize the le system, destroying your application While this is an unlikely event, it can occur and should be guarded against for any production development
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The system boot ow was described in Section 145 We ll brie y review a small portion of the boot process and extend the startup discussion into the early phases of an application s initialization Early in the boot process, the OS analyzes the contents of the SRAM, performing integrity checks on each of the following Network parameters Heap File system
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The network parameters are checked only if the network information was committed to the Flash ROM (see Section 521) If committed, the network information in the SRAM is compared to the contents of the ash ROM If they differ, the ash version of the network data is copied to the SRAM Next, the heap structures are checked for consistency If the heap is found to be in a damaged state, it is reinitialized Because the le system is contained in the heap, it will be destroyed and reinitialized in the event that the heap integrity check fails If the integrity check succeeds, the le system structure is examined and any structural damage to the le system is repaired Detecting Boot-Up Problems The class comdalsemisystemTINIOS provides a method named getBootState that can be invoked to determine what, if any, recovery actions were performed by the operating system during the boot process
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public static native int getBootState()
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It returns the boot state encoded as an integer value that is the bit-wise OR of zero or more of the following public constants de ned in TINIOS
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NETWORK_CONFIGURATION_RESTORED MASTER_ERASE_OCCURRED HEAP_CLEAR_OCCURRED FS_MODIFICATION_OCCURRED
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If no recovery action was required during system boot, getBootState returns 0 Using this method, an application can determine whether it needs to initialize and/ or restore any of its own persistent state For example, it may need to load a con guration le from the network or an external memory device Forced Heap Initialization To force either the entire SRAM or just the le system to be reinitialized during system boot, an application can invoke the blastHeapOnReboot method in the TINIOS class
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public static final void blastHeapOnReboot(int blastType)
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Invoking blastHeapOnReboot serves only as a trigger to reset the le system, and possibly the system con guration information, the next time the system boots It does not have any immediate impact on the system The blastType parameter can be either of the following public integer constants de ned in TINIOS
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BLAST_HEAP BLAST_ALL
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The BLAST_ALL parameter should only be speci ed when the network commit/ restore functionality has been enabled or when the application has network parameters stored in another persistent memory device Resetting the heap happens automatically if the SRAM is not persistent The blastHeapOnReboot method forces this action even if the SRAM is persistent, overriding the utility of the nonvolatizing circuitry It should only be used if it is necessary to guarantee that the heap is reinitialized during the boot process This also assumes that the application can restore any necessary persistent system parameters and les To guard against heap corruption due to sudden loss of power, the memory manager maintains state in the system area of the SRAM This state allows the memory manager to back out during system startup of an incomplete memory operation such as a malloc or a free Maintaining this state during normal execution imposes about a 30 percent overhead on memory management operations This behavior can be disabled by invoking the disablePowerFailRecovery method in the TINIOS class
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public static final void disablePowerFailRecovery()
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This result is faster memory operations and somewhat better performance for applications that perform lots of object creation However, it should only be used in conjunction with blastHeapOnReboot In this case, the heap s consistency at boot time isn t an issue because it will unconditionally be reinitialized Starting the Watchdog For most applications the watchdog timer should be armed early in the initialization phase The watchdog timer guards against a runaway or otherwise unresponsive system Once armed, the timer must be reset periodically by the application or the system will automatically reboot This is ideal, for example, at preventing the system from becoming permanently hung due to deadlocked threads The watchdog s use is described thoroughly in Section 102
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