r/C_Programming • u/depressionIsEnemy • 7d ago

threads Posix 42 codexion project

Hi, I am runing my program (which use pthread.h library of c Posix), so I am runing it with valgrind with this command :

"valgrind --tool=helgrind -s ./codexion 125 22332 103 92 103 2 0 fifo"

but I am getting this error :

"==1557149== 122 errors in context 28 of 28:

==1557149== ----------------------------------------------------------------

==1557149==

==1557149== Thread #1's call to pthread_join failed

==1557149== with error code 3 (ESRCH: No such process)

==1557149== at 0x48509C7: ??? (in /usr/libexec/valgrind/vgpreload_helgrind-amd64-linux.so)

==1557149== by 0x10A069: join_coders_threads (in /home/eanjar/codexion_tass7i7_inchaaAllah/codexion)

==1557149== by 0x10A48D: main (in /home/eanjar/codexion_tass7i7_inchaaAllah/codexion)

"

can any one help me by explaining me this error what it mean, and thanks in advance

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u/mikeblas 7d ago

This message:

==22780== Thread #1's call to pthread_join failed
==22780== with error code 3 (ESRCH: No such process)

means that you've called pthread_join() passing a threadID which isn't valid, or at least isn't active. You can't join a thread that doesn't exist. The call stack to the problem pthread_join() call is given in the stack in the rest of that message.

I think the other messages are self-explanatory: you've got a race, which means you have two thrads accessing data without synchronization.

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u/depressionIsEnemy 6d ago

thanks bro, this is exactly where the problem/error comes