Pthread Create Error Codes
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Join them; it pthread_create tutorial 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 i am getting this error from gcc return code from pthread_create arguments explanation pthread_create() is 11 how do i solve this issue ? #include 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 threads complete before starting new ones. Note that the maximum number of threads that can be created depends on your system (and possibly even depends on a number of other setti -pthread. Description The pthread_create() function starts a new thread in the calling process. The new thread starts execution by invoking start_routine(); arg is https://linux.die.net/man/3/pthread_create passed as 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 https://computing.llnl.gov/tutorials/pthreads/ that is available to another thread in the same process that calls pthread_join(3). * It returns from start_routine(). This is equivalent to calling pthread_exit(3) with the pthread_create arguments 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 are used pthread create error 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 On success, pth API Compiling Threaded Programs Thread Management Creating and Terminating Threads Passing Arguments to Threads Joining and Detaching Threads Stack Management Miscellaneous Routines Exercise 1 Mutex Variables Mutex Variables Overview Creating and Destroying Mutexes Locking and Unlocking Mutexes Condition Variables Condition Variables Overview Creating and Destroying Condition Variables Waiting and Signaling on Condition Variables Monitoring, Debugging and Performance Analysis Tools for Pthreads LLNL Specific Information and Recommendations Topics Not Covered Exercise 2 References and More Information Appendix A: Pthread Library Routines Reference Abstract In shared memory multiprocessor architectures, threads can be used to implement parallelism. Historically, hardware vendors have implemented their own proprietary versions of threads, making portability a concern for software developers. For UNIX systems, a standardized C language threads programming interface has been specified by the IEEE POSIX 1003.1c standard. Implementations that adhere to this standard are referred to as POSIX threads, or Pthreads. The tutorial begins with an introduction to concepts, motivations, and design considerations for using Pthreads. Each of the three major classes of routines in the Pthreads API are then covered: Thread Management, Mutex Variables, and Condition Variables. Example codes are used throughout to demonstrate how to use most of the Pthreads routines needed by a new Pthreads programmer. The tutorial concludes with a discussion of LLNL specifics and how to mix MPI with pthreads. A lab exercise, with numerous example codes (C Language) is also included. Level/Prerequisites: This tutorial is ideal for those who are new to parallel programming with pthreads. A basic understanding of parallel programming in C is required. For those who are unfamiliar with Parallel Programming in general, the material covered in EC3500: Introduction to Parallel Computing would be helpful. Pthreads Overview What is a Thread? Technically, a thread is defined as an independent Pthread_create Linux