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148 lines
4.3 KiB
148 lines
4.3 KiB
Coding
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====================
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Please be consistent with the existing coding style.
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Block style:
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bool Function(char* psz, int n)
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{
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// Comment summarising what this section of code does
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for (int i = 0; i < n; i++)
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{
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// When something fails, return early
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if (!Something())
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return false;
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...
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}
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// Success return is usually at the end
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return true;
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}
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- ANSI/Allman block style
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- 4 space indenting, no tabs
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- No extra spaces inside parenthesis; please don't do ( this )
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- No space after function names, one space after if, for and while
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Variable names begin with the type in lowercase, like nSomeVariable.
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Please don't put the first word of the variable name in lowercase like
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someVariable.
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Common types:
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n integer number: short, unsigned short, int, unsigned int, int64, uint64, sometimes char if used as a number
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d double, float
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f flag
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hash uint256
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p pointer or array, one p for each level of indirection
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psz pointer to null terminated string
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str string object
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v vector or similar list objects
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map map or multimap
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set set or multiset
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bn CBigNum
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Doxygen comments
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-----------------
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To facilitate the generation of documentation, use doxygen-compatible comment blocks for functions, methods and fields.
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For example, to describe a function use:
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```c++
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/**
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* ... text ...
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* @param[in] arg1 A description
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* @param[in] arg2 Another argument description
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* @pre Precondition for function...
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*/
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bool function(int arg1, const char *arg2)
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```
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A complete list of `@xxx` commands can be found at http://www.stack.nl/~dimitri/doxygen/manual/commands.html.
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As Doxygen recognizes the comments by the delimiters (`/**` and `*/` in this case), you don't
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*need* to provide any commands for a comment to be valid, just a description text is fine.
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To describe a class use the same construct above the class definition:
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```c++
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/**
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* Alerts are for notifying old versions if they become too obsolete and
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* need to upgrade. The message is displayed in the status bar.
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* @see GetWarnings()
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*/
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class CAlert
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{
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```
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To describe a member or variable use:
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```c++
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int var; //!< Detailed description after the member
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```
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Also OK:
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```c++
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///
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/// ... text ...
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///
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bool function2(int arg1, const char *arg2)
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```
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Not OK (used plenty in the current source, but not picked up):
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```c++
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//
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// ... text ...
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//
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```
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A full list of comment syntaxes picked up by doxygen can be found at http://www.stack.nl/~dimitri/doxygen/manual/docblocks.html,
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but if possible use one of the above styles.
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Locking/mutex usage notes
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-------------------------
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The code is multi-threaded, and uses mutexes and the
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LOCK/TRY_LOCK macros to protect data structures.
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Deadlocks due to inconsistent lock ordering (thread 1 locks cs_main
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and then cs_wallet, while thread 2 locks them in the opposite order:
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result, deadlock as each waits for the other to release its lock) are
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a problem. Compile with -DDEBUG_LOCKORDER to get lock order
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inconsistencies reported in the debug.log file.
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Re-architecting the core code so there are better-defined interfaces
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between the various components is a goal, with any necessary locking
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done by the components (e.g. see the self-contained CKeyStore class
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and its cs_KeyStore lock for example).
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Threads
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-------
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- ThreadScriptCheck : Verifies block scripts.
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- ThreadImport : Loads blocks from blk*.dat files or bootstrap.dat.
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- StartNode : Starts other threads.
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- ThreadGetMyExternalIP : Determines outside-the-firewall IP address, sends addr message to connected peers when it determines it.
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- ThreadDNSAddressSeed : Loads addresses of peers from the DNS.
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- ThreadMapPort : Universal plug-and-play startup/shutdown
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- ThreadSocketHandler : Sends/Receives data from peers on port 8333.
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- ThreadOpenAddedConnections : Opens network connections to added nodes.
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- ThreadOpenConnections : Initiates new connections to peers.
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- ThreadMessageHandler : Higher-level message handling (sending and receiving).
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- DumpAddresses : Dumps IP addresses of nodes to peers.dat.
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- ThreadFlushWalletDB : Close the wallet.dat file if it hasn't been used in 500ms.
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- ThreadRPCServer : Remote procedure call handler, listens on port 8332 for connections and services them.
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- BitcoinMiner : Generates bitcoins (if wallet is enabled).
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- Shutdown : Does an orderly shutdown of everything.
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