www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.learn - Changing Name of a thread

reply Keywan Ghadami <keywan.ghadami googlemail.com> writes:
Hello, i am trying to the set the name of thread with:

     import core.thread;
     auto thisThread = Thread.getThis();
     thisThread.name = "kiwi";

but GDB prints the name of the programm ("helloworld")

     [Thread debugging using libthread_db enabled]
     Using host libthread_db library 
"/lib/x86_64-linux-gnu/libthread_db.so.1".
     Edit source/app.d to start your project.
     ^C
     Program received signal SIGINT, Interrupt.
     D main () at source/app.d:17
     17		}
     (gdb) info threads
       Id   Target Id         Frame
     * 1    Thread 0x7ffff7fd0800 (LWP 3232) "helloworld" D main 
() at source/app.d:17

Next thing i tried was calling pthread_setname_np (Linux) but it 
seams that is not defined in phobos, so i tried to delcare it by 
my self:

     import core.sys.posix.pthread;
     import std.string;
     extern(C) int pthread_setname_np(pthread_t, const char*);
     pthread_setname_np(pthread_self(), toStringz("thread_name"));

but this gives me
    helloworld ~master: building configuration "application"...
    dmd -c 
-of.dub/build/application-debug-linux.posix-x86_64-dmd_2069-AAC406C4728034581B43AEC54
EAA8E7/helloworld.o -debug -g -w -version=Have_helloworld -Isource/
source/app.d source/kiwi.d -vcolumns
    Linking...
    dmd 
-of.dub/build/application-debug-linux.posix-x86_64-dmd_2069-AAC406C4728034581B43AEC
47EAA8E7/helloworld .dub/build/application-debug-linux.posix-x86_64-dmd_2069-AAC406C4728034581B43AEC54
EAA8E7/helloworld.o -L--no-as-needed -g
    
.dub/build/application-debug-linux.posix-x86_64-dmd_2069-AAC406C4728034581B43AEC547
AA8E7/helloworld.o: In function `_Dmain':
/home/keywan/hello_world/source/app.d:13: undefined reference to 
`_D3app4mainFZ18pthread_setname_npUmxPaZi'
    collect2: error: ld returned 1 exit status
    --- errorlevel 1
    FAIL 
.dub/build/application-debug-linux.posix-x86_64-dmd_2069-AAC406C472803
581B43AEC547EAA8E7/ helloworld executable
    dmd failed with exit code 1.

sorry for asking stupid questions but my background is more 
PHP,Perl,Java...
any help would be appreciated. (context i am trying to make 
debugging easier by giving the threads names)
Jan 09
parent reply tcak <1ltkrs+3wyh1ow7kzn1k sharklasers.com> writes:
On Saturday, 9 January 2016 at 11:02:53 UTC, Keywan Ghadami wrote:
 Hello, i am trying to the set the name of thread with:

     import core.thread;
     auto thisThread = Thread.getThis();
     thisThread.name = "kiwi";

 but GDB prints the name of the programm ("helloworld")

     [Thread debugging using libthread_db enabled]
     Using host libthread_db library 
 "/lib/x86_64-linux-gnu/libthread_db.so.1".
     Edit source/app.d to start your project.
     ^C
     Program received signal SIGINT, Interrupt.
     D main () at source/app.d:17
     17		}
     (gdb) info threads
       Id   Target Id         Frame
     * 1    Thread 0x7ffff7fd0800 (LWP 3232) "helloworld" D main 
 () at source/app.d:17

 Next thing i tried was calling pthread_setname_np (Linux) but 
 it seams that is not defined in phobos, so i tried to delcare 
 it by my self:

     import core.sys.posix.pthread;
     import std.string;
     extern(C) int pthread_setname_np(pthread_t, const char*);
     pthread_setname_np(pthread_self(), 
 toStringz("thread_name"));

 but this gives me
    helloworld ~master: building configuration "application"...
    dmd -c 
 -of.dub/build/application-debug-linux.posix-x86_64-dmd_2069-AAC406C4728034581B43AEC54
EAA8E7/helloworld.o -debug -g -w -version=Have_helloworld -Isource/
source/app.d source/kiwi.d -vcolumns
    Linking...
    dmd 
 -of.dub/build/application-debug-linux.posix-x86_64-dmd_2069-AAC406C4728034581B43AEC
47EAA8E7/helloworld .dub/build/application-debug-linux.posix-x86_64-dmd_2069-AAC406C4728034581B43AEC54
EAA8E7/helloworld.o -L--no-as-needed -g
    
 .dub/build/application-debug-linux.posix-x86_64-dmd_2069-AAC406C4728034581B43AEC547
AA8E7/helloworld.o: In function `_Dmain':
 /home/keywan/hello_world/source/app.d:13: undefined reference 
 to `_D3app4mainFZ18pthread_setname_npUmxPaZi'
    collect2: error: ld returned 1 exit status
    --- errorlevel 1
    FAIL 
 .dub/build/application-debug-linux.posix-x86_64-dmd_2069-AAC406C472803
581B43AEC547EAA8E7/ helloworld executable
    dmd failed with exit code 1.

 sorry for asking stupid questions but my background is more 
 PHP,Perl,Java...
 any help would be appreciated. (context i am trying to make 
 debugging easier by giving the threads names)
I tried your code with a little addition as follows: [code] import core.sys.posix.pthread; import std.string; import std.stdio; extern(C) int pthread_setname_np(pthread_t, const char*); void main(){ pthread_setname_np(pthread_self(), toStringz("thread_name")); readln(); } [/code] Compiled it with "dmd blah.d", and then run "./blah". Because there is "readln" there, I opened another terminal and used "ps H -o 'pid tid cmd comm'". In the output: PID TID CMD COMMAND 5089 5089 ./blah thread_name So, it works.
Jan 09
parent Keywan Ghadami <keywan.ghadami googlemail.com> writes:
On Saturday, 9 January 2016 at 17:30:47 UTC, tcak wrote:
 I tried your code with a little addition as follows:

 [code]
 import core.sys.posix.pthread;
 import std.string;
 import std.stdio;

 extern(C) int pthread_setname_np(pthread_t, const char*);

 void main(){
     pthread_setname_np(pthread_self(), 
 toStringz("thread_name"));
     readln();
 }
 [/code]

 Compiled it with "dmd blah.d", and then run "./blah".

 Because there is "readln" there, I opened another terminal and
 used "ps H -o 'pid tid cmd comm'".

 In the output:

  PID   TID CMD                         COMMAND
 5089  5089 ./blah                      thread_name

 So, it works.
tcak, thank you very much, it works! Maybe interesting for others: The reason for the error message i had was, that i declared extern(C) int pthread_setname_np(pthread_t, const char*); within the main method.
Jan 09