/* Copyright (C) 2002, 2003 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <errno.h> #include <pthread.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <time.h> #include <unistd.h> #include <sys/mman.h> #include <sys/time.h> #include <sys/wait.h> int *condition; static int do_test (void) { #if ! _POSIX_THREAD_PROCESS_SHARED puts ("_POSIX_THREAD_PROCESS_SHARED not supported, test skipped"); return 0; #else size_t ps = sysconf (_SC_PAGESIZE); char tmpfname[] = "/tmp/tst-cond6.XXXXXX"; char data[ps]; void *mem; int fd; pthread_mutexattr_t ma; pthread_mutex_t *mut1; pthread_mutex_t *mut2; pthread_condattr_t ca; pthread_cond_t *cond; pid_t pid; int result = 0; fd = mkstemp (tmpfname); if (fd == -1) { printf ("cannot open temporary file: %m\n"); exit (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"); exit (1); } mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); if (mem == MAP_FAILED) { printf ("mmap failed: %m\n"); exit (1); } mut1 = (pthread_mutex_t *) (((uintptr_t) mem + __alignof (pthread_mutex_t)) & ~(__alignof (pthread_mutex_t) - 1)); mut2 = mut1 + 1; cond = (pthread_cond_t *) (((uintptr_t) (mut2 + 1) + __alignof (pthread_cond_t)) & ~(__alignof (pthread_cond_t) - 1)); condition = (int *) (((uintptr_t) (cond + 1) + __alignof (int)) & ~(__alignof (int) - 1)); if (pthread_mutexattr_init (&ma) != 0) { puts ("mutexattr_init failed"); exit (1); } if (pthread_mutexattr_setpshared (&ma, PTHREAD_PROCESS_SHARED) != 0) { puts ("mutexattr_setpshared failed"); exit (1); } if (pthread_mutex_init (mut1, &ma) != 0) { puts ("1st mutex_init failed"); exit (1); } if (pthread_mutex_init (mut2, &ma) != 0) { puts ("2nd mutex_init failed"); exit (1); } if (pthread_condattr_init (&ca) != 0) { puts ("condattr_init failed"); exit (1); } if (pthread_condattr_setpshared (&ca, PTHREAD_PROCESS_SHARED) != 0) { puts ("condattr_setpshared failed"); exit (1); } if (pthread_cond_init (cond, &ca) != 0) { puts ("cond_init failed"); exit (1); } if (pthread_mutex_lock (mut1) != 0) { puts ("parent: 1st mutex_lock failed"); exit (1); } puts ("going to fork now"); pid = fork (); if (pid == -1) { puts ("fork failed"); exit (1); } else if (pid == 0) { struct timespec ts; struct timeval tv; if (pthread_mutex_lock (mut2) != 0) { puts ("child: mutex_lock failed"); exit (1); } if (pthread_mutex_unlock (mut1) != 0) { puts ("child: 1st mutex_unlock failed"); exit (1); } /* Waiting for the condition will fail. But we want the timeout here. */ if (gettimeofday (&tv, NULL) != 0) { puts ("gettimeofday failed"); exit (1); } TIMEVAL_TO_TIMESPEC (&tv, &ts); ts.tv_nsec += 500000000; if (ts.tv_nsec >= 1000000000) { ts.tv_nsec -= 1000000000; ++ts.tv_sec; } do if (pthread_cond_timedwait (cond, mut2, &ts) != 0) { puts ("child: cond_wait failed"); exit (1); } while (*condition == 0); if (pthread_mutex_unlock (mut2) != 0) { puts ("child: 2nd mutex_unlock failed"); exit (1); } puts ("child done"); } else { int status; if (pthread_mutex_lock (mut1) != 0) { puts ("parent: 2nd mutex_lock failed"); exit (1); } if (pthread_mutex_lock (mut2) != 0) { puts ("parent: 3rd mutex_lock failed"); exit (1); } if (pthread_cond_signal (cond) != 0) { puts ("parent: cond_signal failed"); exit (1); } *condition = 1; if (pthread_mutex_unlock (mut2) != 0) { puts ("parent: mutex_unlock failed"); exit (1); } puts ("waiting for child"); waitpid (pid, &status, 0); result |= status; puts ("parent done"); } return result; #endif } #define TEST_FUNCTION do_test () #include "../test-skeleton.c"