# 7.3.66. `thread_dump`

## 7.3.66.1. Summary

New in version 11.1.1.

Note

Currently, this command works only on Windows.

`thread_dump` has the following a features:

> - `thread_dump` puts a backtrace of all threads into a log as logs of NOTICE level at the time of running this command as below.

>   For example, `thread_dump` puts a backtrace in a log as below.

>       2021-12-22 11:10:33.518000|n| -- Thread 00008052 --
>       2021-12-22 11:10:33.582000|n| (unknown):0:0: ZwGetContextThread(): <ntdll>: <C:\Windows\SYSTEM32\ntdll.dll>
>       2021-12-22 11:10:33.591000|n| (unknown):0:0: ??_C@_0BA@PIIKBMGH@grn_thread_dump@(): <libgroonga>: <C:\Users\aaa\groonga-11.1.1-8988854-x64-vs2019-with-vcruntime\bin\libgroonga.dll>
>       2021-12-22 11:10:33.591000|n| (unknown):0:0: ??_C@_0CC@GMBIJECC@D?3?2a?2groonga?2groonga?2lib?2thread@(): <libgroonga>: <C:\Users\aaa\groonga-11.1.1-8988854-x64-vs2019-with-vcruntime\bin\libgroonga.dll>
>       2021-12-22 11:10:33.591000|n| (unknown):0:0: (unknown)(): <(unknown)>: <(unknown)>
>       2021-12-22 11:10:33.591000|n| (unknown):0:0: (unknown)(): <(unknown)>: <(unknown)>
>       2021-12-22 11:10:33.591000|n| (unknown):0:0: (unknown)(): <(unknown)>: <(unknown)>
>       2021-12-22 11:10:33.591000|n| (unknown):0:0: ??_C@_0BG@NHAMHJPM@?9?9?9?9?9?9?9?9?9?9?9?9?9?9?9?9?9?9?9?9?9@(): <libgroonga>: <C:\Users\aaa\groonga-11.1.1-8988854-x64-vs2019-with-vcruntime\bin\libgroonga.dll>
>       2021-12-22 11:10:33.592000|n| D:\a\groonga\groonga\lib\thread.c:148:0: grn_thread_dump(): <libgroonga>: <C:\Users\aaa\groonga-11.1.1-8988854-x64-vs2019-with-vcruntime\bin\libgroonga.dll>
>       2021-12-22 11:10:33.593000|n| D:\a\groonga\groonga\lib\proc\proc_thread.c:87:0: command_thread_dump(): <libgroonga>: <C:\Users\aaa\groonga-11.1.1-8988854-x64-vs2019-with-vcruntime\bin\libgroonga.dll>
>       2021-12-22 11:10:33.593000|n| D:\a\groonga\groonga\lib\expr.c:1624:0: grn_proc_call(): <libgroonga>: <C:\Users\aaa\groonga-11.1.1-8988854-x64-vs2019-with-vcruntime\bin\libgroonga.dll>
>       2021-12-22 11:10:33.594000|n| D:\a\groonga\groonga\lib\command.c:193:0: grn_command_run(): <libgroonga>: <C:\Users\aaa\groonga-11.1.1-8988854-x64-vs2019-with-vcruntime\bin\libgroonga.dll>
>       2021-12-22 11:10:33.594000|n| D:\a\groonga\groonga\lib\expr.c:1660:0: grn_expr_exec(): <libgroonga>: <C:\Users\aaa\groonga-11.1.1-8988854-x64-vs2019-with-vcruntime\bin\libgroonga.dll>
>       2021-12-22 11:10:33.594000|n| D:\a\groonga\groonga\lib\ctx.c:1716:0: grn_ctx_qe_exec(): <libgroonga>: <C:\Users\aaa\groonga-11.1.1-8988854-x64-vs2019-with-vcruntime\bin\libgroonga.dll>
>       2021-12-22 11:10:33.597000|n| D:\a\groonga\groonga\lib\ctx.c:1828:0: grn_ctx_send(): <libgroonga>: <C:\Users\aaa\groonga-11.1.1-8988854-x64-vs2019-with-vcruntime\bin\libgroonga.dll>
>       2021-12-22 11:10:33.597000|n| D:\a\groonga\groonga\src\groonga.c:574:0: do_alone(): <groonga>: <C:\Users\aaa\groonga-11.1.1-8988854-x64-vs2019-with-vcruntime\bin\groonga.exe>
>       2021-12-22 11:10:33.597000|n| D:\a\groonga\groonga\src\groonga.c:4652:22: main(): <groonga>: <C:\Users\aaa\groonga-11.1.1-8988854-x64-vs2019-with-vcruntime\bin\groonga.exe>
>       2021-12-22 11:10:33.601000|n| d:\a01\_work\6\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288:34: __scrt_common_main_seh(): <groonga>: <C:\Users\aaa\groonga-11.1.1-8988854-x64-vs2019-with-vcruntime\bin\groonga.exe>
>       2021-12-22 11:10:33.601000|n| (unknown):0:0: BaseThreadInitThunk(): <KERNEL32>: <C:\Windows\System32\KERNEL32.DLL>
>       2021-12-22 11:10:33.601000|n| (unknown):0:0: RtlUserThreadStart(): <ntdll>: <C:\Windows\SYSTEM32\ntdll.dll>
>       2021-12-22 11:10:33.603000|n| ---------------------
>       2021-12-22 11:10:33.603000|n| -- Thread 00007860 --
>       2021-12-22 11:10:33.607000|n| (unknown):0:0: NtWaitForWorkViaWorkerFactory(): <ntdll>: <C:\Windows\SYSTEM32\ntdll.dll>
>       2021-12-22 11:10:33.610000|n| (unknown):0:0: TpReleaseCleanupGroupMembers(): <ntdll>: <C:\Windows\SYSTEM32\ntdll.dll>
>       2021-12-22 11:10:33.610000|n| (unknown):0:0: BaseThreadInitThunk(): <KERNEL32>: <C:\Windows\System32\KERNEL32.DLL>
>       2021-12-22 11:10:33.610000|n| (unknown):0:0: RtlUserThreadStart(): <ntdll>: <C:\Windows\SYSTEM32\ntdll.dll>
>       2021-12-22 11:10:33.611000|n| ---------------------

## 7.3.66.2. Syntax

This command has not parameter:

    thread_dump

## 7.3.66.3. Usage

We can get a backtrace of all threads into a log as logs of NOTICE level at the time of running this command.

Execution example:

    thread_dump
    # [[0, 1337566253.89858, 0.000355720520019531], true]

## 7.3.66.4. Parameters

This section describes all parameters.

### 7.3.66.4.1. Required parameters

There is no required parameter.

### 7.3.66.4.2. Optional parameters

There is no optional parameter.

## 7.3.66.5. Return value

The command returns true as body on success such as:

    [HEADER, true]

If `thread_dump` fails, error details are in HEADER.

See Output format for `HEADER`.

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7.3.67. `thread_limit`