strtok function thread safety

c linux thread-safety strtok
Steveng picture Steveng · Oct 27, 2010 · Viewed 12.8k times · Source

I have been spending some time in debugging a programme which gives segmentation fault. The bug is quite indeterministic and intermittent, which is annoying. I narrowed it down to the calling of strtok(). I suspect that it is the calling of strtok() to split string in two different threads that causes the segmentation fault. Can I call strtok() in two different threads?

Thanks.

Answer

Puppe picture Puppe · Oct 27, 2010

strtok() is not reentrant so it should not be used from threaded applications, use strtok_r() instead.

Related questions

Undefined reference to pthread_create in Linux

I picked up the following demo off the web from https://computing.llnl.gov/tutorials/pthreads/ #include <pthread.h> #include <stdio.h> #define NUM_THREADS 5 void *PrintHello(void *threadid) { long tid; tid = (long)threadid; printf("Hello …

Read More
Write to .txt file?

How can I write a little piece of text into a .txt file? I've been Googling for over 3-4 hours, but can't find out how to do it. fwrite(); has so many arguments, and I don't know how to use …

Read More
Easily measure elapsed time

I am trying to use time() to measure various points of my program. What I don't understand is why the values in the before and after are the same? I understand this is not the best way to profile my …

Read More