Pthread_create Eagain Error
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Pthread_join Example
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Pthread_exit
each other. Join them; it only takes a minute: Sign up pthread_create and EAGAIN up vote 0 down vote favorite I got an EAGAIN when trying to spawn a thread using pthread_create. However, from what I've checked, the threads seem to have been terminated properly. What determines the OS to give EAGAIN when trying to create a pthread_detach thread using pthread_create? Would it be possible that unclosed sockets/file handles play a part in causing this EAGAIN (i.e they share the same resource space)? And lastly, is there any tool to check resource usage, or any functions that can be used to see how many pthread objects are active at the time? pthreads posix memory-leaks share|improve this question asked Dec 26 '11 at 10:07 kamziro 2,27542859 add a comment| 3 Answers 3 active oldest votes up vote 6 down vote accepted Okay, found the answer. Even if pthread_exit or pthread_cancel is called, the parent process still need to call pthread_join to release the pthread ID, which will then become recyclable. Putting a pthread_join(tid, NULL) in the end did the trick. edit (was not waitpid, but rather pthread_join) share|improve this answer edited Jan 3 '12 at 0:39 answered Jan 3 '12 at 0:33 kamziro 2,27542859 4 If you're not interested in waiting on the thread, a pthread_detach() should do the same as far as releasing resources is concerned. –Michael B
PTHREAD_CREATE(3) NAME top pthread_create - create a new thread SYNOPSIS top #include
Pthread_create_detached
const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg); Compile and
Pthread_detach Example
link with -pthread. DESCRIPTION top The pthread_create() function starts a new thread in the semaphore calling process. The new thread starts execution by invoking start_routine(); arg is passed as the sole argument of start_routine(). The new thread terminates in one of the following ways: http://stackoverflow.com/questions/8634736/pthread-create-and-eagain * It calls pthread_exit(3), specifying an exit status value 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 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 http://man7.org/linux/man-pages/man3/pthread_create.3.html 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. 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 capabili
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