Eddystone test using modified DAL
Dependencies: BLE_API mbed-dev-bin nRF51822
Dependents: microbit-eddystone
Fork of microbit-dal by
Diff: source/types/RefCounted.cpp
- Revision:
- 1:8aa5cdb4ab67
diff -r fb15f7887843 -r 8aa5cdb4ab67 source/types/RefCounted.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/source/types/RefCounted.cpp Thu Apr 07 01:33:22 2016 +0100 @@ -0,0 +1,98 @@ +/* +The MIT License (MIT) + +Copyright (c) 2016 British Broadcasting Corporation. +This software is provided by Lancaster University by arrangement with the BBC. + +Permission is hereby granted, free of charge, to any person obtaining a +copy of this software and associated documentation files (the "Software"), +to deal in the Software without restriction, including without limitation +the rights to use, copy, modify, merge, publish, distribute, sublicense, +and/or sell copies of the Software, and to permit persons to whom the +Software is furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL +THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. +*/ + +/** + * Base class for payload for ref-counted objects. Used by ManagedString and MicroBitImage. + * There is no constructor, as this struct is typically malloc()ed. + */ +#include "mbed.h" +#include "MicroBitConfig.h" +#include "RefCounted.h" +#include "MicroBitDisplay.h" + +/** + * Initializes for one outstanding reference. + */ +void RefCounted::init() +{ + // Initialize to one reference (lowest bit set to 1) + refCount = 3; +} + +/** + * Checks if the object resides in flash memory. + * + * @param t the object to check. + * + * @return true if the object resides in flash memory, false otherwise. + */ +static inline bool isReadOnlyInline(RefCounted *t) +{ + uint32_t refCount = t->refCount; + + if (refCount == 0xffff) + return true; // object in flash + + // Do some sanity checking while we're here + if (refCount == 1 || // object should have been deleted + (refCount & 1) == 0) // refCount doesn't look right + microbit_panic(MICROBIT_HEAP_ERROR); + + // Not read only + return false; +} + +/** + * Checks if the object resides in flash memory. + * + * @return true if the object resides in flash memory, false otherwise. + */ +bool RefCounted::isReadOnly() +{ + return isReadOnlyInline(this); +} + +/** + * Increment reference count. + */ +void RefCounted::incr() +{ + if (!isReadOnlyInline(this)) + refCount += 2; +} + +/** + * Decrement reference count. + */ +void RefCounted::decr() +{ + if (isReadOnlyInline(this)) + return; + + refCount -= 2; + if (refCount == 1) { + free(this); + } +}