diff options
Diffstat (limited to 'nptl/tst-cond6.c')
| -rw-r--r-- | nptl/tst-cond6.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/nptl/tst-cond6.c b/nptl/tst-cond6.c new file mode 100644 index 0000000..63c5470 --- /dev/null +++ b/nptl/tst-cond6.c @@ -0,0 +1,233 @@ +/* Copyright (C) 2002 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; + + +int +main (void) +{ + 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) != 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; +} |