diff options
Diffstat (limited to 'REORG.TODO/nptl/tst-spin2.c')
| -rw-r--r-- | REORG.TODO/nptl/tst-spin2.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/REORG.TODO/nptl/tst-spin2.c b/REORG.TODO/nptl/tst-spin2.c new file mode 100644 index 0000000000..1a8260d256 --- /dev/null +++ b/REORG.TODO/nptl/tst-spin2.c @@ -0,0 +1,158 @@ +/* Copyright (C) 2002-2017 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-spin2.XXXXXX"; + char data[ps]; + void *mem; + int fd; + pthread_spinlock_t *s; + pid_t pid; + char *p; + int err; + + 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; + } + + s = (pthread_spinlock_t *) (((uintptr_t) mem + + __alignof (pthread_spinlock_t)) + & ~(__alignof (pthread_spinlock_t) - 1)); + p = (char *) (s + 1); + + if (pthread_spin_init (s, PTHREAD_PROCESS_SHARED) != 0) + { + puts ("spin_init failed"); + return 1; + } + + if (pthread_spin_lock (s) != 0) + { + puts ("spin_lock failed"); + return 1; + } + + err = pthread_spin_trylock (s); + if (err == 0) + { + puts ("1st spin_trylock succeeded"); + return 1; + } + else if (err != EBUSY) + { + puts ("1st spin_trylock didn't return EBUSY"); + return 1; + } + + err = pthread_spin_unlock (s); + if (err != 0) + { + puts ("parent: spin_unlock failed"); + return 1; + } + + err = pthread_spin_trylock (s); + if (err != 0) + { + puts ("2nd spin_trylock failed"); + return 1; + } + + *p = 0; + + puts ("going to fork now"); + pid = fork (); + if (pid == -1) + { + puts ("fork failed"); + return 1; + } + else if (pid == 0) + { + /* Play some lock ping-pong. It's our turn to unlock first. */ + if ((*p)++ != 0) + { + puts ("child: *p != 0"); + return 1; + } + + if (pthread_spin_unlock (s) != 0) + { + puts ("child: 1st spin_unlock failed"); + return 1; + } + + puts ("child done"); + } + else + { + if (pthread_spin_lock (s) != 0) + { + puts ("parent: 2nd spin_lock failed"); + return 1; + } + + puts ("waiting for child"); + + waitpid (pid, NULL, 0); + + puts ("parent done"); + } + + return 0; +} + +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" |