Pthread Error

PTHREAD_CREATE(3) NAME top pthread_create - create a new thread SYNOPSIS top #include int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg); pthread example Compile and link with -pthread. DESCRIPTION top The pthread_create()

Pthread Attributes

function starts a new thread in the calling process. The new thread starts execution by invoking start_routine(); arg is passed as pthread example c++ the sole argument of start_routine(). The new thread terminates in one of the following ways: * It calls pthread_exit(3), specifying an exit status value that is available to another thread in the same

Pthread_create Undefined Reference

process that calls pthread_join(3). * It returns from start_routine(). This is equivalent to calling pthread_exit(3) with the value supplied in the return statement. * It is canceled (see pthread_cancel(3)). * Any of the threads in the process calls exit(3), or the main thread performs a return from main(). This causes the termination of all threads in the process. The attr argument points to a pthread_attr_t structure whose contents pthread_create c are used at thread creation time to determine attributes for the new thread; this structure is initialized using pthread_attr_init(3) and related functions. If attr is NULL, then the thread is created with default attributes. Before returning, a successful call to pthread_create() stores the ID of the new thread in the buffer pointed to by thread; this identifier is used to refer to the thread in subsequent calls to other pthreads functions. The new thread inherits a copy of the creating thread's signal mask (pthread_sigmask(3)). The set of pending signals for the new thread is empty (sigpending(2)). The new thread does not inherit the creating thread's alternate signal stack (sigaltstack(2)). The new thread inherits the calling thread's floating-point environment (fenv(3)). The initial value of the new thread's CPU-time clock is 0 (see pthread_getcpuclockid(3)). Linux-specific details The new thread inherits copies of the calling thread's capability sets (see capabilities(7)) and CPU affinity mask (see sched_setaffinity(2)). RETURN VALUE top On success, pthread_create() returns 0; on error, it returns an error number, and the contents of *thread are undefined. ERRORS top EAGAIN Insufficient resources to create another thread. EAGAIN A system-imposed limit on the number of threads w

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Pthread_join

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Pthread_create Function

Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just pthread_attr_t like you, helping each other. Join them; it only takes a minute: Sign up Return code from pthread_create() is 11 up vote 2 down vote favorite 2 I am trying to run a simple multi threaded programming and http://man7.org/linux/man-pages/man3/pthread_create.3.html i am getting this error from gcc return code from pthread_create() is 11 how do i solve this issue ? #include #include #include #define NUM_THREADS 20000 void *PrintHello(void *threadid) { long tid; tid = (long)threadid; printf("Hello World! It's me, thread #%ld!\n", tid); pthread_exit(NULL); } int main (int argc, char *argv[]) { pthread_t threads[NUM_THREADS]; int rc; long t; for(t=0; thttp://stackoverflow.com/questions/7038586/return-code-from-pthread-create-is-11 *)t); if (rc){ printf("ERROR; return code from pthread_create() is %d\n", rc); exit(-1); } } /* Last thing that main() should do */ pthread_exit(NULL); } c multithreading gcc share|improve this question asked Aug 12 '11 at 10:06 Jaseem 1,00431930 What do you want to do with 20000 threads? Are you on a cluster? –RedX Aug 12 '11 at 10:10 1 You should change default thread stack size to start high number of threads. –osgx Aug 12 '11 at 10:14 What osgx said. See pthread_attr_setstacksize. –R.. Aug 12 '11 at 12:16 @RedX Testing, I am learning multi threaded programming and I was trying to figure out how fast the whole system is. –Jaseem Aug 16 '11 at 19:24 add a comment| 1 Answer 1 active oldest votes up vote 11 down vote accepted Well, you could start with determining what the error actually means. According to this and this (other resources will tell you the same information, this is just an example), the number 11 stands for EAGAIN which in turn means "The system lacked the necessary resources to create another thread, or the system-imposed limit on the total number of threads in a process PTHREAD_THREADS_MAX would be exceeded.". That matches the fact that your are trying to create 20.000(!) threads. Create less threads, or wait until thread

Get Kubuntu Get Xubuntu Get Lubuntu Get UbuntuStudio Get Mythbuntu Get Edubuntu Get Ubuntu-GNOME Get UbuntuKylin Ubuntu Code of Conduct Ubuntu Wiki Community Wiki Other Support Launchpad Answers Ubuntu IRC Support AskUbuntu Official Documentation User Documentation https://ubuntuforums.org/showthread.php?t=1419353 Social Media Facebook Twitter Useful Links Distrowatch Bugs: Ubuntu PPAs: Ubuntu Web Upd8: Ubuntu OMG! Ubuntu Ubuntu Insights Planet Ubuntu Activity Page Please read before SSO login Advanced Search Forum The Ubuntu Forum Community Ubuntu Specialised http://unix.stackexchange.com/questions/33396/gcc-cant-link-to-pthread Support Development & Programming Programming Talk [SOLVED] pthread error macro declaration (c++) Having an Issue With Posting ? Do you want to help us debug the posting issues ? < is the place to report it, pthread example thanks ! Results 1 to 6 of 6 Thread: pthread error macro declaration (c++) Thread Tools Show Printable Version Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode March 2nd, 2010 #1 silentIm View Profile View Forum Posts Private Message Spilled the Beans Join Date Jun 2009 Location melbourne Beans 13 DistroUbuntu 9.04 Jaunty Jackalope pthread error macro declaration (c++) Sorry to ask a beginner question. Why pthread example c++ i get undeclared error declaration, and i don't see any error macro declaration in pthread.h. Code: #include ... int status = pthread_cond_timedwait(&cond, &mutex); if(status != 0 && status != ETIMEDOUT) // ETIMEDOUT not declared compile-error ... The same code is compilable and run on mingw and pthread-win32. GCC version is 4.4.1. Adv Reply March 2nd, 2010 #2 azagaros View Profile View Forum Posts Private Message A Carafe of Ubuntu Join Date Dec 2009 Beans 82 Re: pthread error macro declaration (c++) type gcc -v to see the version you are compiling under. I assume you are compiling on gcc 4.4.1 on a Ubuntu. It is assuming something is undefined in your code, so the first thing is to start checking versions of the libraries under gcc and or if all the libraries are there. Adv Reply March 2nd, 2010 #3 silentIm View Profile View Forum Posts Private Message Spilled the Beans Join Date Jun 2009 Location melbourne Beans 13 DistroUbuntu 9.04 Jaunty Jackalope Re: pthread error macro declaration (c++) so i run getconf GNU_LIBPTHREAD_VERSION and it says NPTL 2.10.1 or how do I check for the library version? may be the one that is used by GCC and the one that used by my system is different. Adv Reply March 2nd, 2010

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Unix & Linux Questions Tags Users Badges Unanswered Ask Question _ Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top gcc can't link to pthread? up vote 12 down vote favorite 1 I have recently installed XUbuntu 11.10 64bit, but I am having problem compiling the most simple pthread example. Here is the code pthread_simple.c: #include #include main() { pthread_t f2_thread, f1_thread; void *f2(), *f1(); int i1,i2; i1 = 1; i2 = 2; pthread_create(&f1_thread,NULL,f1,&i1); pthread_create(&f2_thread,NULL,f2,&i2); pthread_join(f1_thread,NULL); pthread_join(f2_thread,NULL); } void *f1(int *x){ int i; i = *x; sleep(1); printf("f1: %d",i); pthread_exit(0); } void *f2(int *x){ int i; i = *x; sleep(1); printf("f2: %d",i); pthread_exit(0); } And here is the compile command gcc -lpthread pthread_simple.c The results: lptang@tlp-linux:~/test/test-pthread$ gcc -lpthread pthread_simple.c /tmp/ccmV0LdM.o: In function `main': pthread_simple.c:(.text+0x2c): undefined reference to `pthread_create' pthread_simple.c:(.text+0x46): undefined reference to `pthread_create' pthread_simple.c:(.text+0x57): undefined reference to `pthread_join' pthread_simple.c:(.text+0x68): undefined reference to `pthread_join' collect2: ld returned 1 exit status Does anyone know what's causing the pr