From: Cem Ahmet MERCAN (HBM) (mercan@be.itu.edu.tr)
Date: Wed 18 May 2005 - 16:26:09 EEST
Merhaba ;
Bir hata yapmisim:
-L/tam/adresle/kutuphanedizini olacakti.
İyi Günler...
Cem Ahmet MERCAN
Cem Ahmet MERCAN (HBM) wrote:
> Merhaba;
>
> -lpthread ile derlerken size bir takim kutuphanelerin yerini
> bulamadigindan yakiniyorsa:
> Bulamadigi kutuphaneyi find komutu ile bulun ve -L/dizin/kutuphane
> seklinde her itiraz ettigi kutuphaneyi gosterin.
>
> İyi Günler...
>
> Cem Ahmet MERCAN
>
>
> alper yuce wrote:
>
>> 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:
>> o <thread.h> and <pthread.h>
>> o <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 bulamıyor..
>>> /usr/lib/libphread.a bu library nin kullandigi diger libraryler
>>> neler ?
>>> genel olarak bu sorunu nasıl cozebilirim.zincirleme biseylere
>>> gereksinim duyuyor.ve nerde oldugunu soylemiyor..
>>> iyi calismalar..
>>>
>>> */Tufan BIYIKTAS <tufan.biyiktas@gmail.com>
>>> <mailto: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
>>>> başlik dosyasinda tanimli. ) Fakat ben bunu include etmeme
>>>> ragmen link zamaninda onu gormuyor . şöyle bir hata veriyor:
>>>>
>>>> "undefined reference to pthread_create"
>>>>
>>>> Bunun hakkinda bir bilgisi olan var mi?
>>>>
>>>> tesekkurler ,
>>>>
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>>>
>>>
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>>
>>
>>
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