There are quite a few mistakes: First, you’re passing pointer to int random but in the thread you convert the argument (pointer) to the number. Either you have to cast the int random to a pointer or in the thread cast args to long * and read the memory from that pointer. The latter will … Read more
There is no general problem with two threads executing system calls on the same socket. You may encounter some specific issues, though: If you call recvfrom() in both threads (one waiting for the PLC to send a request, and the other waiting for the PLC to respond to a command from the server), you don’t … Read more
The general case depends on whether the threads are wholly independent of each other. If you go multi-threaded, you must ensure that any shared resource is accessed appropriate protection. The code shown has a shared resource in the use of srand() and rand(). You will get different results in a multi-threaded process compared with those … Read more
You use of strtok() is wrong: line = strtok(buffer, NULL); should be line = strtok(NULL, delim); Another mistakes should be fixed similarly. The elements of text_lines are uninitialized: text_lines = malloc(6000 * sizeof(char*)); this allocated 6000 pointers to char, but none of these pointers are initialized. 0 solved where is the pthread segfault happening?
Terminology correction: one thread may create another thread, not fork, which is usually used to mention one process forking another. No, a thread has no way to get another thread’s identifier. On Linux, you can check if gettid() == getpid() to find if it’s the main thread. Solaris has thr_main() to identify if the caller … Read more
The *fp is a global variable, so each therad will initialize it with fopen and after finished working try to close it. the *fp is shared between threads (which should not be) so each thread before exiting tries to close the file handle stored in *fp and the double free occurs when multiple threads tries … Read more