/* Copyright (C) 2002-2013 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <errno.h> #include <pthread.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/mman.h> #include <sys/wait.h> static int do_test (void) { size_t ps = sysconf (_SC_PAGESIZE); char tmpfname[] = "/tmp/tst-barrier2.XXXXXX"; char data[ps]; void *mem; int fd; pthread_barrier_t *b; pthread_barrierattr_t a; pid_t pid; int serials = 0; int cnt; int status; int p; fd = mkstemp (tmpfname); if (fd == -1) { printf ("cannot open temporary file: %m\n"); return 1; } /* Make sure it is always removed. */ unlink (tmpfname); /* Create one page of data. */ memset (data, '\0', ps); /* Write the data to the file. */ if (write (fd, data, ps) != (ssize_t) ps) { puts ("short write"); return 1; } mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); if (mem == MAP_FAILED) { printf ("mmap failed: %m\n"); return 1; } b = (pthread_barrier_t *) (((uintptr_t) mem + __alignof (pthread_barrier_t)) & ~(__alignof (pthread_barrier_t) - 1)); if (pthread_barrierattr_init (&a) != 0) { puts ("barrierattr_init failed"); return 1; } if (pthread_barrierattr_getpshared (&a, &p) != 0) { puts ("1st barrierattr_getpshared failed"); return 1; } if (p != PTHREAD_PROCESS_PRIVATE) { puts ("default pshared value wrong"); return 1; } if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0) { puts ("barrierattr_setpshared failed"); return 1; } if (pthread_barrierattr_getpshared (&a, &p) != 0) { puts ("2nd barrierattr_getpshared failed"); return 1; } if (p != PTHREAD_PROCESS_SHARED) { puts ("pshared value after setpshared call wrong"); return 1; } if (pthread_barrier_init (b, &a, 2) != 0) { puts ("barrier_init failed"); return 1; } if (pthread_barrierattr_destroy (&a) != 0) { puts ("barrierattr_destroy failed"); return 1; } puts ("going to fork now"); pid = fork (); if (pid == -1) { puts ("fork failed"); return 1; } /* Just to be sure we don't hang forever. */ alarm (4); #define N 30 for (cnt = 0; cnt < N; ++cnt) { int e; e = pthread_barrier_wait (b); if (e == PTHREAD_BARRIER_SERIAL_THREAD) ++serials; else if (e != 0) { printf ("%s: barrier_wait returned value %d != 0 and PTHREAD_BARRIER_SERIAL_THREAD\n", pid == 0 ? "child" : "parent", e); return 1; } } alarm (0); printf ("%s: was %d times the serial thread\n", pid == 0 ? "child" : "parent", serials); if (pid == 0) /* The child. Pass the number of times we had the serializing thread back to the parent. */ exit (serials); if (waitpid (pid, &status, 0) != pid) { puts ("waitpid failed"); return 1; } if (!WIFEXITED (status)) { puts ("child exited abnormally"); return 1; } if (WEXITSTATUS (status) + serials != N) { printf ("total number of serials is %d, expected %d\n", WEXITSTATUS (status) + serials, N); return 1; } return 0; } #define TEST_FUNCTION do_test () #include "../test-skeleton.c"