From: alper yuce (alper_yuce@yahoo.com)
Date: Wed 18 May 2005 - 16:00:06 EEST
A standard C compiler (cc, gcc etc)
Include files:
<thread.h> and <pthread.h>
<errno.h>, <limits.h>, <signal.h>, <unistd.h>
bu dosyalari ekledik , linki hem kaldirarak hem de ekli halde denedik. ama bir ise yaramadi. Sorunda bir degisme yok.
("undefined reference to pthread_create" sorunumuz bu. pthread_create fonksiyonu pthread.h in içinde tanimli. Fakat ben bunu include etmeme ragmen onu görmüyor.)
Tufan BIYIKTAS <tufan.biyiktas@gmail.com> wrote:
http://www.cs.cf.ac.uk/Dave/C/ sayfasindan alinti:
Compiling a Multithreaded Application
There are many options to consider for header files, define flags, and linking.
Preparing for Compilation
The following items are required to compile and link a multithreaded program.
A standard C compiler (cc, gcc etc)
Include files:
<thread.h> and <pthread.h>
<errno.h>, <limits.h>, <signal.h>, <unistd.h>
......
The include file <pthread.h>, used with the -lpthread library, compiles code that is conformant with the multithreading interfaces defined by the POSIX 1003.1c standard.
.......
Do not link a nonthreaded program with -lthread or -lpthread. Doing so establishes multithreading mechanisms at link time that are initiated at run time. These slow down a single-threaded application, waste system resources, and produce misleading results when you debug your code
Debugging a Multithreaded Program
The following list points out some of the more frequent oversights and errors that can cause bugs in multithreaded programs.
Passing a pointer to the caller's stack as an argument to a new thread.
Accessing global memory (shared changeable state) without the protection of a synchronization mechanism.
Creating deadlocks caused by two threads trying to acquire rights to the same pair of global resources in alternate order (so that one thread controls the first resource and the other controls the second resource and neither can proceed until the other gives up).
Trying to reacquire a lock already held (recursive deadlock).
Creating a hidden gap in synchronization protection. This is caused when a code segment protected by a synchronization mechanism contains a call to a function that frees and then reacquires the synchronization mechanism before it returns to the caller. The result is that it appears to the caller that the global data has been protected when it actually has not.
Mixing UNIX signals with threads -- it is better to use the sigwait() model for handling asynchronous signals.
Forgetting that default threads are created PTHREAD_CREATE_JOINABLE and must be reclaimed with pthread_join(). Note, pthread_exit() does not free up its storage space.
Making deeply nested, recursive calls and using large automatic arrays can cause problems because multithreaded programs have a more limited stack size than single-threaded programs.
Specifying an inadequate stack size, or using non-default stacks. And, note that multithreaded programs (especially those containing bugs) often behave differently in two successive runs, given identical inputs, because of differences in the thread scheduling order.
In general, multithreading bugs are statistical instead of deterministic. Tracing is usually a more effective method of finding order of execution problems than is breakpoint-based debugging.
alper yuce wrote: tesekkurler cevap icin..
bu sorun hallolunca baska bir seyi bulam#305;yor..
/usr/lib/libphread.a bu library nin kullandigi diger libraryler neler ?
genel olarak bu sorunu nas#305;l cozebilirim.zincirleme biseylere gereksinim duyuyor.ve nerde oldugunu soylemiyor..
iyi calismalar..
Tufan BIYIKTAS <tufan.biyiktas@gmail.com> wrote:
gcc -o prog rprog.c -lpthread
alper yuce wrote:
Bir tane projemiz var ve projede "pthread_create" fonksiyonunu kullanmamiz gerekiyor. (Bu fonksiyon pthread.h ba#351;lik dosyasinda tanimli. ) Fakat ben bunu include etmeme ragmen link zamaninda onu gormuyor . #351;öyle bir hata veriyor:
"undefined reference to pthread_create"
Bunun hakkinda bir bilgisi olan var mi?
tesekkurler ,
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