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Merge #18645: [doc] Update thread information in developer docs

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808ef36b89 [doc] Update thread information in developer docs (John Newbery)

Pull request description:

  - DumpAddresses thread was removed in #5964
  - Shutdown thread was removed in #5679
  - Add new threads (scheduler, RPC worker, indexer, tor control)
  - Small changes to documentation of other threads

ACKs for top commit:
  MarcoFalke:
    ACK 808ef36b89
  hebasto:
    ACK 808ef36b89.

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MarcoFalke 2020-04-15 16:30:00 -04:00
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doc/developer-notes.md
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@ -423,27 +423,52 @@ and its `cs_KeyStore` lock for example).
Threads
-------
- ThreadScriptCheck : Verifies block scripts.
- [Main thread (`bitcoind`)](https://doxygen.bitcoincore.org/bitcoind_8cpp.html#a0ddf1224851353fc92bfbff6f499fa97)
: Started from `main()` in `bitcoind.cpp`. Responsible for starting up and
shutting down the application.
- ThreadImport : Loads blocks from `blk*.dat` files or `-loadblock=<file>`.
- [ThreadImport (`b-loadblk`)](https://doxygen.bitcoincore.org/init_8cpp.html#ae9e290a0e829ec0198518de2eda579d1)
: Loads blocks from `blk*.dat` files or `-loadblock=<file>` on startup.
- ThreadDNSAddressSeed : Loads addresses of peers from the DNS.
- [ThreadScriptCheck (`b-scriptch.x`)](https://doxygen.bitcoincore.org/validation_8cpp.html#a925a33e7952a157922b0bbb8dab29a20)
: Parallel script validation threads for transactions in blocks.
- ThreadMapPort : Universal plug-and-play startup/shutdown.
- [ThreadHTTP (`b-http`)](https://doxygen.bitcoincore.org/httpserver_8cpp.html#abb9f6ea8819672bd9a62d3695070709c)
: Libevent thread to listen for RPC and REST connections.
- ThreadSocketHandler : Sends/Receives data from peers on port 8333.
- [HTTP worker threads(`b-httpworker.x`)](https://doxygen.bitcoincore.org/httpserver_8cpp.html#aa6a7bc27265043bc0193220c5ae3a55f)
: Threads to service RPC and REST requests.
- ThreadOpenAddedConnections : Opens network connections to added nodes.
- [Indexer threads (`b-txindex`, etc)](https://doxygen.bitcoincore.org/class_base_index.html#a96a7407421fbf877509248bbe64f8d87)
: One thread per indexer.
- ThreadOpenConnections : Initiates new connections to peers.
- [SchedulerThread (`b-scheduler`)](https://doxygen.bitcoincore.org/class_c_scheduler.html#a14d2800815da93577858ea078aed1fba)
: Does asynchronous background tasks like dumping wallet contents, dumping
addrman and running asynchronous validationinterface callbacks.
- ThreadMessageHandler : Higher-level message handling (sending and receiving).
- [TorControlThread (`b-torcontrol`)](https://doxygen.bitcoincore.org/torcontrol_8cpp.html#a4faed3692d57a0d7bdbecf3b37f72de0)
: Libevent thread for tor connections.
- DumpAddresses : Dumps IP addresses of nodes to `peers.dat`.
- Net threads:
- ThreadRPCServer : Remote procedure call handler, listens on port 8332 for connections and services them.
- [ThreadMessageHandler (`b-msghand`)](https://doxygen.bitcoincore.org/class_c_connman.html#aacdbb7148575a31bb33bc345e2bf22a9)
: Application level message handling (sending and receiving). Almost
all net_processing and validation logic runs on this thread.
- Shutdown : Does an orderly shutdown of everything.
- [ThreadDNSAddressSeed (`b-dnsseed`)](https://doxygen.bitcoincore.org/class_c_connman.html#aa7c6970ed98a4a7bafbc071d24897d13)
: Loads addresses of peers from the DNS.
- [ThreadMapPort (`b-upnp`)](https://doxygen.bitcoincore.org/net_8cpp.html#a63f82a71c4169290c2db1651a9bbe249)
: Universal plug-and-play startup/shutdown.
- [ThreadSocketHandler (`b-net`)](https://doxygen.bitcoincore.org/class_c_connman.html#a765597cbfe99c083d8fa3d61bb464e34)
: Sends/Receives data from peers on port 8333.
- [ThreadOpenAddedConnections (`b-addcon`)](https://doxygen.bitcoincore.org/class_c_connman.html#a0b787caf95e52a346a2b31a580d60a62)
: Opens network connections to added nodes.
- [ThreadOpenConnections (`b-opencon`)](https://doxygen.bitcoincore.org/class_c_connman.html#a55e9feafc3bab78e5c9d408c207faa45)
: Initiates new connections to peers.
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