Pthread_create Error Numbers

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 pthread_create example more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags pthread_create tutorial Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like

Pthread_create Arguments

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 i

Pthread_create Arguments Explanation

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; t

void *(*start_routine)(void*), void *arg); DESCRIPTION The pthread_create() function is used to create a new thread, with attributes specified by attr, within a process. If attr is NULL, the

Undefined Reference To `pthread_create'

default attributes are used. If the attributes specified by attr are pthread_join modified later, the thread's attributes are not affected. Upon successful completion, pthread_create() stores the ID of the pthread_create multiple arguments created thread in the location referenced by thread. The thread is created executing start_routine with arg as its sole argument. If the start_routine returns, the effect is http://stackoverflow.com/questions/7038586/return-code-from-pthread-create-is-11 as if there was an implicit call to pthread_exit() using the return value of start_routine as the exit status. Note that the thread in which main() was originally invoked differs from this. When it returns from main(), the effect is as if there was an implicit call to exit() using the return value of main() http://pubs.opengroup.org/onlinepubs/7908799/xsh/pthread_create.html as the exit status. The signal state of the new thread is initialised as follows: The signal mask is inherited from the creating thread. The set of signals pending for the new thread is empty. If pthread_create() fails, no new thread is created and the contents of the location referenced by thread are undefined. RETURN VALUE If successful, the pthread_create() function returns zero. Otherwise, an error number is returned to indicate the error. ERRORS The pthread_create() function will fail if: [EAGAIN] 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. [EINVAL] The value specified by attr is invalid. [EPERM] The caller does not have appropriate permission to set the required scheduling parameters or scheduling policy. The pthread_create() function will not return an error code of [EINTR]. EXAMPLES None. APPLICATION USAGE None. FUTURE DIRECTIONS None. SEE ALSO pthread_exit(), pthread_join(), fork(), . DERIVATION Derived from the

-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 passed as the sole argument of https://linux.die.net/man/3/pthread_create 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 process http://greenteapress.com/thinkos/html/thinkos010.html 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)). * pthread_create arguments 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 at thread creation time to determine attributes for the new thread; this structure is initialized using pthread_attr_init(3) and related functions. pthread_create error numbers 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, pthread_create() returns 0; on error, it returns an error number, and the contents of *thread are undefined. Errors EAGAIN Insufficient resources to create another thread, or a system-imposed limit on the number of threads was encountered. The latter case may

mentioned threads in Section 2.3, I said that a thread is a kind of process. Now I will provide a more careful explanation.When you create a process, the operating system creates a new address space, which includes the text segment, static segment, and heap; it also creates a new “thread of execution”, which includes the program counter and other hardware state, and the run-time stack.The processes we have seen so far are “single-threaded”, which means that only one thread of execution runs in each address space. In this chapter, you will learn about “multi-threaded” processes that have multiple threads running in the same address space.Within a single process, all threads share the same text segment, so they run the same code. But different threads often run different parts of the code.And they share the same static segment, so if one thread changes a global variable, other threads see the change. They also share the heap, so threads can share dynamically-allocated chunks.But each thread has its own stack, so threads can call functions without interfering with each other. And usually threads can’t access each other’s local variables.The example code for this chapter is in the repository for this book, in a directory named counter. For information on downloading this code, see Section ??.9.1  Creating threadsThe most popular threading standard used with C is POSIX Threads, or Pthreads for short. The POSIX standard defines a thread model and an interface for creating and controlling threads. Most versions of UNIX provide an implementation of Pthreads.Using Pthreads is like using most C libraries:You include headers files at the beginning of your program.You write code that calls functions defined by Pthreads.When you compile the program, you link it with the Pthread library.For my examples, I include the following headers:#include #include #include The first two are standard; the third is for Pthreads and the fourth is for semaphores. To compile with the Pthread library in gcc, you can use the -l option on the command line:gcc -g -O2 -o array array.c -lpthread This compiles a source file named array.c with debugging info and optimization, links with the Pthread library, and generates an executable named array.9.2  Creating threadsThe Pthread function that creates threads is called pthread_create. The following function s