pthread.h is a header for the Unix/Linux (POSIX) API for threads. A POSIX layer such as Cygwin would probably compile an app with #include <pthreads.h>. The native Windows threading API is exposed via #include <windows.h> and it works slightly differently to Linux’s threading. Still, there’s a replacement “glue” library maintained at http://sourceware.org/pthreads-win32/ ; note that it has some slight incompatibilities with … Read more
By older versions of the POSIX standard the first method with an initializer is only guaranteed to work with statically allocated variables, not when the variable is an auto variable that is defined in a function body. Although I have never seen a platform where this would not be allowed, even for auto variables, and … Read more
Because it is a structure initializer, you cannot use it to init the structure in a statement apart from its declaration. It is defined on my system like so: Expanded and used, we see: That is, expands to:
There is more than one way to define “memory leak”. In particular, there are two primary definitions of “memory leak” that are in common usage among programmers. The first commonly used definition of “memory leak” is, “Memory was allocated and was not subsequently freed before the program terminated.” However, many programmers (rightly) argue that certain … Read more
You are wrongly using an hack to pass an integer to a thread. The idea behind what you are doing is an integer is 4 bytes and a pointer is 4 bytes in x86_32 (8 bytes in x86_64) so I can convert an integer type to a pointer type and then convert it back to … Read more
Just the thread. The POSIX documentation for sleep() says: The sleep() function shall cause the calling thread to be suspended from execution…
The process received a SIGPIPE. The default behaviour for this signal is to end the process. A SIGPIPE is sent to a process if it tried to write to a socket that had been shutdown for writing or isn’t connected (anymore). To avoid that the program ends in this case, you could either make the process ignore SIGPIPE#include <signal.h> … Read more
This will print out a hexadecimal representation of a pthread_t, no matter what that actually is: To just print a small id for a each pthread_t something like this could be used (this time using iostreams): Depending on the platform and the actual representation of pthread_t it might here be necessary to define an operator< for pthread_t, because std::map needs an ordering on the elements:
Use -lpthread as the last compiler flag. example: gcc -o sample sample.c -lpthread
I picked up the following demo off the web from https://computing.llnl.gov/tutorials/pthreads/ But when I compile it on my machine (running Ubuntu Linux 9.04) I get the following error: This doesn’t make any sense to me, because the header includes pthread.h, which should have the pthread_create function. Any ideas what’s going wrong?