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Pthread_create Error Eagain

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Pthread_exit

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 thread using pthread_create? Would it be possible that unclosed sockets/file handles play a pthread_detach 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 Burr Jan 3 '12 at 0:50 add a comment| up vote 3 down vote As a practical matter EAGAIN is almost always related to running out

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Solution Problem of symbol version Conclusion About the author Introduction The pthread_create() service from the pthread (NPTL) library, may fail returning the ENOMEM or EAGAIN error. This papers focuses on the reason why this could happen and how to solve the problem. Creation of a thread The creation of a thread involves the following steps (output of the strace tool): mmap(NULL, 8388608, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x350dc000 mprotect(0x350dc000, 4096, PROT_NONE) = 0 clone(child_stack=0x358db030, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x358db4f8, tls=0x358e2930, child_tidptr=0x358db4f8)= 6927 sched_setscheduler(6927, SCHED_OTHER, { 0 }) = 0 In the preceding output: The mmap() call reserves a memory zone for the thread's stack and its TCB. The default stack size in the pthread library is got fromthe getrlimit() system call with the resource's name RLIMIT_STACK. In our environment, this value is 8 MB. The returned address is 0x350dc000 The call to mprotect() protects a page of memory (4KB long) from the address 0x350dc000 to detect the stack overflows: this is the red zone which triggers a SIGSEGV if it is accessed for reading or writing. The call to clone() creates the thread. It is passed the address of the stack as first parameter : 0x358db030. The stacks grows from the upper addresses to the lower ones. The space between 0x358db030 and 0x358dc000 is for the thread's control block (TCB) and the thread's local storage (TLS). From a virtual memory point of view, the mapping can be seen from /proc//smaps: 350dc000-350dd000 ---p 350dc000 00:00 0 --------> Red zone which ends the stack to detect stack overflows Size: 4 kB Rss: 0 kB Pss: 0 kB Shared_Clean: 0 kB Shared_Dirty: 0 kB Private_Clean: 0 kB Private_Dirty: 0 kB Referenced: 0 kB Swap: 0 kB 350dd000-358dc000 rw-p 350dd000 00:00 0 --------> Stack which grows from the upper to the lower addresses Size: 8188 kB Rss: 8 kB Pss: 8 kB Shared_Clean: 0 kB Shared_Dirty: 0 kB Private_Clean: 0 kB Private_Dirty: 8 kB Referenced: 8 kB The layout of the thread's stack is: Figure 1: Layout of the thread's stack The2.5 versus 2.8 version of the C library The study of the sources related to pthread_create() in the GLIBC 2.5 and 2.8 libraries points out that the service does not return the same error when mmap() fails with the error code ENOMEM. In 2.5, the code related to the stack allocation of the thread is in .../nptl/allocatestack.c: mem = mmap (NULL, size, prot, MAP_PRIVATE | MAP_ANONYMOUS | ARCH_MAP_FLAGS, -1, 0); if (__builtin_expec

 

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pthread_create error enomem

Pthread create Error Enomem p 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 Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of million programmers just like you helping each other Join them it only takes a minute Sign up pthread create fails w ENOMEM up vote down