Pthread Error 22

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is my output and the gdb information: In main(), creating thread 1 ERROR: return code from pthread_create() is 22 for thread 1 In main(), creating thread 2 ERROR: return code from pthread_create() is 22 for thread 2 In main(), creating thread 3 ERROR: return code from pthread_create() is 22 for thread 3 In main(), creating thread 4 ERROR: return code from pthread_create() is 22 for thread 4 In main(), creating thread 5 ERROR: return errno 22 code from pthread_create() is 22 for thread 5 Program received signal SIGSEGV, Segmentation fault. 0xb7fb4d8a in pthread_join (threadid=76038327, thread_return=0x0) at pthread_join.c:46 46 pthread_join.c: No such file or directory. And here is my code: #include #include #include #include #include #include #define SBUFSIZE 1025 char errorstr[SBUFSIZE]; FILE* inputfp[5]; void* f(void* inpFile) { fprintf(stderr, "%s\n", (char*)inpFile); return NULL; } int main (int argc, char* argv[]) { int i; /* Thread Variables */ pthread_attr_t attr; pthread_t *th[argc-2]; //one thread for each input file /* allocate memory for the threads */ for (i = 0; i < (argc-2); i++) { th[i] = (pthread_t *) malloc(sizeof(pthread_t)); inputfp[i] = fopen(argv[i], "r"); if (!inputfp[i]) { sprintf(errorstr, "Error Opening Input File: %s", argv[i]); perror(errorstr); } } /* Create one thread for each input file */ for (i = 1; i < (argc - 1); i++) { fprintf (stderr, "In main(), creating thread %1d\n", i); int rc = pthread_create (th[i], &attr, f, inputfp[i-1]); if (rc) { printf("ERROR: return code from pthread_create() is %d for thread %d\n", rc, i); } } /* wait for the threads to finish */ for (i = 1; i < (argc - 1); i++) { pthread_join(*th[i], 0); } return EXIT_SUCCESS; } I'm missing something, but I don't know what. Can anyone help? Thank you! EDIT: Here is how I

Sign in Pricing Blog Support Search GitHub This repository Watch 118 Star 838 Fork 126 dart-lang/sdk Code pthread_create example Issues 3,982 Pull requests 3 Projects 0 Wiki Pulse Graphs New issue runtime/vm/os_thread_linux.cc:234: error: pthread error: 22 (Invalid argument) #24169 Closed kodandersson opened this Issue Aug 21, 2015 · 3 comments Projects None yet Labels area-vm Milestone 1.12 Assignees kodandersson 1 participant kodandersson commented Aug 21, 2015 http://build.chromium.org/p/client.dart/builders/vm-linux-debug-ia32-be/builds/4811/steps/tests/logs/stdio @iposva-google http://stackoverflow.com/questions/15037234/difficulty-creating-pthreads-error-22 kodandersson added the Area-VM label Aug 21, 2015 kodandersson commented Aug 21, 2015 @johnmccutchan kodandersson self-assigned this Aug 21, 2015 kodandersson added this to the 1.12 milestone Aug 21, 2015 kodandersson commented Aug 21, 2015 Seems something is locking a mutex (probably StoreBuffer::global_mutex_) after its destruction. kodandersson commented Aug 21, 2015 At Dart::CleanUp https://github.com/dart-lang/sdk/issues/24169 time, there may still be threads around that access their store buffer, so we need to keep the global_mutex_ around until @zanderso lands the clean shutdown CL. kodandersson added a commit that referenced this issue Aug 21, 2015 kodandersson Keep StoreBuffer::global_mutex_ and global_empty_ alive. … At Dart::CleanUp time, there may still be threads around that access their store buffer, so we need to keep these around until @zanderso lands the clean shutdown CL. We should stop leaking them once we cleanly stop all threads at VM shutdown (see issue 23844). BUG=#24169 R=iposva@google.com Review URL: https://codereview.chromium.org//1305123003 . http://www.domaigne.com/blog/computing/pthreads-errors-and-errno/ UNIX authority"), I tried to make my example as perfect as possible. http://man7.org/linux/man-pages/man3/pthread_create.3.html In an academic fashion, I checked every function's return code for possible errors. That's where I got it wrong for the Pthreads APIs. Oh well, they do not use errno… The Problem: Before the advent of Pthreads, POSIX functions used to return -1 on error, and set the corresponding pthread error error code in the global variable errno[2]. This mechanism has a few drawbacks even for single-threaded process: it is not simple to return -1 as valid value. a signal handler may change the errno value between the point a function set errno, and the point where you check the errno variable. Of course, a global errno doesn't work for multi-threaded processes. Indeed, pthread error 22 a thread could execute a function that modifies errno just before you check the value in another thread. The (Pthreads) Solution: Since Pthreads, the errno variable is thread-local. That is, every thread has its own "errno copy". If you (or a system function) set the errno variable in one thread, it won't affect the errno value in any other thread. This is shown in the example below. Download errno_01.c1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 /*------------------------------ errno_01.c -------------------------------* compile with: cc -pthread errno_01.c -o errno_01 Copyright Loic Domaigne. Licensed under the Apache License, Version 2.0. *--------------------------------------------------------------------------*/ #include // sleep() #include #include #include #include // strerror() #include /**********************

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); Compile and link with -pthread. DESCRIPTION top 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 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 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 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