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fiber: fix fibers with custom stack leak
Vladislav Shpilevoy authored 
Fibers with custom stack couldn't be reused via cord->dead list,
but neither were ever deleted via mempool_free(). They just leaked
until the cord was destroyed. Their custom stack also leaked.

It happened for all non-joinable custom-stack fibers. That was
because fiber_destroy() simply skipped the destruction if the
fiber is the current one.

It didn't affect joinable fibers because their fiber_destroy() is
done in another fiber. Their stack was deleted, but the fiber
itself still leaked.

The fix makes so fiber_destroy() is never called for the current
fiber. Instead, cord uses an approach like in pthread library -
the fiber who wants to be deleted is saved into cord->garbage
member. When some other fiber will want to be deleted in the
future, it will firstly cleanup the previous one and put self into
its place. And so on - fibers cleanup each other.

The process is optimized for the case when the fiber to delete is
not the current one - can delete it right away then.

NO_DOC=Bugfix

(cherry picked from commit 4ea29055)
1f73d81a
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user avatar 1f73d81a
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Tarantool

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https://tarantool.io/en/

Patch submissions and discussion of particular patches https://lists.tarantool.org/mailman/listinfo/tarantool-patches/

General development discussions https://lists.tarantool.org/mailman/listinfo/tarantool-discussions/

Tarantool is an in-memory database and application server.

Key features of the application server:

  • 100% compatible drop-in replacement for Lua 5.1, based on LuaJIT 2.1. Simply use #!/usr/bin/tarantool instead of #!/usr/bin/lua in your script.
  • full support for Lua modules and a rich set of own modules, including cooperative multitasking, non-blocking I/O, access to external databases, etc

Key features of the database:

  • ANSI SQL, including views, joins, referential and check constraints
  • MsgPack data format and MsgPack based client-server protocol
  • two data engines: 100% in-memory with optional persistence and an own implementation of LSM-tree, to use with large data sets
  • multiple index types: HASH, TREE, RTREE, BITSET
  • asynchronous master-master replication
  • authentication and access control
  • the database is just a C extension to the application server and can be turned off

Supported platforms are Linux/x86, FreeBSD/x86 and OpenBSD/x86, Mac OS X.

Tarantool is ideal for data-enriched components of scalable Web architecture: queue servers, caches, stateful Web applications.

To download and install Tarantool as a binary package for your OS, please visit https://tarantool.io/en/download/.

To build Tarantool from source, see detailed instructions in the Tarantool documentation at https://tarantool.io/en/doc/2.1/dev_guide/building_from_source/.

Please report bugs at https://github.com/tarantool/tarantool/issues We also warmly welcome your feedback in the discussion mailing list, tarantool@googlegroups.com.

Thank you for your interest in Tarantool!