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/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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#include "apr_strings.h"
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#include "apr_arch_proc_mutex.h"
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#include "apr_arch_file_io.h" /* for apr_mkstemp() */
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APR_DECLARE(apr_status_t) apr_proc_mutex_destroy(apr_proc_mutex_t *mutex)
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return apr_pool_cleanup_run(mutex->pool, mutex, apr_proc_mutex_cleanup);
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static apr_status_t proc_mutex_no_tryacquire(apr_proc_mutex_t *new_mutex)
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#if APR_HAS_POSIXSEM_SERIALIZE || APR_HAS_FCNTL_SERIALIZE || \
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APR_HAS_PROC_PTHREAD_SERIALIZE || APR_HAS_SYSVSEM_SERIALIZE
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static apr_status_t proc_mutex_no_child_init(apr_proc_mutex_t **mutex,
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#if APR_HAS_POSIXSEM_SERIALIZE
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#define SEM_FAILED (-1)
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static apr_status_t proc_mutex_posix_cleanup(void *mutex_)
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apr_proc_mutex_t *mutex = mutex_;
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if (sem_close(mutex->psem_interproc) < 0) {
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static apr_status_t proc_mutex_posix_create(apr_proc_mutex_t *new_mutex,
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new_mutex->interproc = apr_palloc(new_mutex->pool,
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sizeof(*new_mutex->interproc));
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* This bogusness is to follow what appears to be the
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* lowest common denominator in Posix semaphore naming:
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* - be at most 14 chars
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* - be unique and not match anything on the filesystem
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* Because of this, we ignore fname, and try our
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* own naming system. We tuck the name away, since it might
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* be useful for debugging. to make this as robust as possible,
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* we initially try something larger (and hopefully more unique)
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* and gracefully fail down to the LCD above.
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* NOTE: Darwin (Mac OS X) seems to be the most restrictive
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* implementation. Versions previous to Darwin 6.2 had the 14
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* char limit, but later rev's allow up to 31 characters.
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* FIXME: There is a small window of opportunity where
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* instead of getting a new semaphore descriptor, we get
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* a previously obtained one. This can happen if the requests
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* are made at the "same time" and in the small span of time between
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* the sem_open and the sem_unlink. Use of O_EXCL does not
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* help here however...
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sec = apr_time_sec(now);
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usec = apr_time_usec(now);
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apr_snprintf(semname, sizeof(semname), "/ApR.%lxZ%lx", sec, usec);
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psem = sem_open(semname, O_CREAT, 0644, 1);
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if ((psem == (sem_t *)SEM_FAILED) && (errno == ENAMETOOLONG)) {
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/* Oh well, good try */
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psem = sem_open(semname, O_CREAT, 0644, 1);
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if (psem == (sem_t *)SEM_FAILED) {
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/* Ahhh. The joys of Posix sems. Predelete it... */
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new_mutex->psem_interproc = psem;
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new_mutex->fname = apr_pstrdup(new_mutex->pool, semname);
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apr_pool_cleanup_register(new_mutex->pool, (void *)new_mutex,
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apr_proc_mutex_cleanup,
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apr_pool_cleanup_null);
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static apr_status_t proc_mutex_posix_acquire(apr_proc_mutex_t *mutex)
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if (sem_wait(mutex->psem_interproc) < 0) {
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mutex->curr_locked = 1;
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static apr_status_t proc_mutex_posix_release(apr_proc_mutex_t *mutex)
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mutex->curr_locked = 0;
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if (sem_post(mutex->psem_interproc) < 0) {
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/* any failure is probably fatal, so no big deal to leave
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* ->curr_locked at 0. */
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static const apr_proc_mutex_unix_lock_methods_t mutex_posixsem_methods =
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#if APR_PROCESS_LOCK_IS_GLOBAL || !APR_HAS_THREADS || defined(POSIXSEM_IS_GLOBAL)
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APR_PROCESS_LOCK_MECH_IS_GLOBAL,
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proc_mutex_posix_create,
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proc_mutex_posix_acquire,
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proc_mutex_no_tryacquire,
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proc_mutex_posix_release,
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proc_mutex_posix_cleanup,
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proc_mutex_no_child_init,
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#endif /* Posix sem implementation */
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#if APR_HAS_SYSVSEM_SERIALIZE
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static struct sembuf proc_mutex_op_on;
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static struct sembuf proc_mutex_op_off;
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static void proc_mutex_sysv_setup(void)
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proc_mutex_op_on.sem_num = 0;
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proc_mutex_op_on.sem_op = -1;
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proc_mutex_op_on.sem_flg = SEM_UNDO;
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proc_mutex_op_off.sem_num = 0;
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proc_mutex_op_off.sem_op = 1;
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proc_mutex_op_off.sem_flg = SEM_UNDO;
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static apr_status_t proc_mutex_sysv_cleanup(void *mutex_)
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apr_proc_mutex_t *mutex=mutex_;
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if (mutex->interproc->filedes != -1) {
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semctl(mutex->interproc->filedes, 0, IPC_RMID, ick);
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static apr_status_t proc_mutex_sysv_create(apr_proc_mutex_t *new_mutex,
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new_mutex->interproc = apr_palloc(new_mutex->pool, sizeof(*new_mutex->interproc));
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new_mutex->interproc->filedes = semget(IPC_PRIVATE, 1, IPC_CREAT | 0600);
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if (new_mutex->interproc->filedes < 0) {
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proc_mutex_sysv_cleanup(new_mutex);
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if (semctl(new_mutex->interproc->filedes, 0, SETVAL, ick) < 0) {
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proc_mutex_sysv_cleanup(new_mutex);
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new_mutex->curr_locked = 0;
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apr_pool_cleanup_register(new_mutex->pool,
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(void *)new_mutex, apr_proc_mutex_cleanup,
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apr_pool_cleanup_null);
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static apr_status_t proc_mutex_sysv_acquire(apr_proc_mutex_t *mutex)
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rc = semop(mutex->interproc->filedes, &proc_mutex_op_on, 1);
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} while (rc < 0 && errno == EINTR);
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mutex->curr_locked = 1;
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static apr_status_t proc_mutex_sysv_release(apr_proc_mutex_t *mutex)
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mutex->curr_locked = 0;
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rc = semop(mutex->interproc->filedes, &proc_mutex_op_off, 1);
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} while (rc < 0 && errno == EINTR);
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static const apr_proc_mutex_unix_lock_methods_t mutex_sysv_methods =
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#if APR_PROCESS_LOCK_IS_GLOBAL || !APR_HAS_THREADS || defined(SYSVSEM_IS_GLOBAL)
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APR_PROCESS_LOCK_MECH_IS_GLOBAL,
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proc_mutex_sysv_create,
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proc_mutex_sysv_acquire,
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proc_mutex_no_tryacquire,
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proc_mutex_sysv_release,
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proc_mutex_sysv_cleanup,
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proc_mutex_no_child_init,
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#endif /* SysV sem implementation */
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#if APR_HAS_PROC_PTHREAD_SERIALIZE
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static apr_status_t proc_mutex_proc_pthread_cleanup(void *mutex_)
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apr_proc_mutex_t *mutex=mutex_;
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if (mutex->curr_locked == 1) {
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if ((rv = pthread_mutex_unlock(mutex->pthread_interproc))) {
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#ifdef PTHREAD_SETS_ERRNO
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/* curr_locked is set to -1 until the mutex has been created */
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if (mutex->curr_locked != -1) {
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if ((rv = pthread_mutex_destroy(mutex->pthread_interproc))) {
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#ifdef PTHREAD_SETS_ERRNO
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if (munmap((caddr_t)mutex->pthread_interproc, sizeof(pthread_mutex_t))) {
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static apr_status_t proc_mutex_proc_pthread_create(apr_proc_mutex_t *new_mutex,
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pthread_mutexattr_t mattr;
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fd = open("/dev/zero", O_RDWR);
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new_mutex->pthread_interproc = (pthread_mutex_t *)mmap(
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sizeof(pthread_mutex_t),
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PROT_READ | PROT_WRITE, MAP_SHARED,
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if (new_mutex->pthread_interproc == (pthread_mutex_t *) (caddr_t) -1) {
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new_mutex->curr_locked = -1; /* until the mutex has been created */
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if ((rv = pthread_mutexattr_init(&mattr))) {
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#ifdef PTHREAD_SETS_ERRNO
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proc_mutex_proc_pthread_cleanup(new_mutex);
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if ((rv = pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED))) {
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#ifdef PTHREAD_SETS_ERRNO
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proc_mutex_proc_pthread_cleanup(new_mutex);
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pthread_mutexattr_destroy(&mattr);
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#ifdef HAVE_PTHREAD_MUTEX_ROBUST
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if ((rv = pthread_mutexattr_setrobust_np(&mattr,
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PTHREAD_MUTEX_ROBUST_NP))) {
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#ifdef PTHREAD_SETS_ERRNO
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proc_mutex_proc_pthread_cleanup(new_mutex);
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pthread_mutexattr_destroy(&mattr);
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if ((rv = pthread_mutexattr_setprotocol(&mattr, PTHREAD_PRIO_INHERIT))) {
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#ifdef PTHREAD_SETS_ERRNO
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proc_mutex_proc_pthread_cleanup(new_mutex);
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pthread_mutexattr_destroy(&mattr);
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#endif /* HAVE_PTHREAD_MUTEX_ROBUST */
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if ((rv = pthread_mutex_init(new_mutex->pthread_interproc, &mattr))) {
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#ifdef PTHREAD_SETS_ERRNO
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proc_mutex_proc_pthread_cleanup(new_mutex);
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pthread_mutexattr_destroy(&mattr);
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new_mutex->curr_locked = 0; /* mutex created now */
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if ((rv = pthread_mutexattr_destroy(&mattr))) {
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#ifdef PTHREAD_SETS_ERRNO
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proc_mutex_proc_pthread_cleanup(new_mutex);
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apr_pool_cleanup_register(new_mutex->pool,
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apr_proc_mutex_cleanup,
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apr_pool_cleanup_null);
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static apr_status_t proc_mutex_proc_pthread_acquire(apr_proc_mutex_t *mutex)
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if ((rv = pthread_mutex_lock(mutex->pthread_interproc))) {
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#ifdef PTHREAD_SETS_ERRNO
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#ifdef HAVE_PTHREAD_MUTEXATTR_SETROBUST_NP
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/* Okay, our owner died. Let's try to make it consistent again. */
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if (rv == EOWNERDEAD) {
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pthread_mutex_consistent_np(mutex->pthread_interproc);
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mutex->curr_locked = 1;
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/* TODO: Add proc_mutex_proc_pthread_tryacquire(apr_proc_mutex_t *mutex) */
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static apr_status_t proc_mutex_proc_pthread_release(apr_proc_mutex_t *mutex)
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mutex->curr_locked = 0;
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if ((rv = pthread_mutex_unlock(mutex->pthread_interproc))) {
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#ifdef PTHREAD_SETS_ERRNO
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static const apr_proc_mutex_unix_lock_methods_t mutex_proc_pthread_methods =
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APR_PROCESS_LOCK_MECH_IS_GLOBAL,
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proc_mutex_proc_pthread_create,
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proc_mutex_proc_pthread_acquire,
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proc_mutex_no_tryacquire,
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proc_mutex_proc_pthread_release,
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proc_mutex_proc_pthread_cleanup,
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proc_mutex_no_child_init,
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#if APR_HAS_FCNTL_SERIALIZE
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static struct flock proc_mutex_lock_it;
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static struct flock proc_mutex_unlock_it;
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static apr_status_t proc_mutex_fcntl_release(apr_proc_mutex_t *);
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static void proc_mutex_fcntl_setup(void)
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proc_mutex_lock_it.l_whence = SEEK_SET; /* from current point */
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proc_mutex_lock_it.l_start = 0; /* -"- */
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proc_mutex_lock_it.l_len = 0; /* until end of file */
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proc_mutex_lock_it.l_type = F_WRLCK; /* set exclusive/write lock */
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proc_mutex_lock_it.l_pid = 0; /* pid not actually interesting */
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proc_mutex_unlock_it.l_whence = SEEK_SET; /* from current point */
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proc_mutex_unlock_it.l_start = 0; /* -"- */
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proc_mutex_unlock_it.l_len = 0; /* until end of file */
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proc_mutex_unlock_it.l_type = F_UNLCK; /* set exclusive/write lock */
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proc_mutex_unlock_it.l_pid = 0; /* pid not actually interesting */
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static apr_status_t proc_mutex_fcntl_cleanup(void *mutex_)
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apr_proc_mutex_t *mutex=mutex_;
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if (mutex->curr_locked == 1) {
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status = proc_mutex_fcntl_release(mutex);
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if (status != APR_SUCCESS)
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return apr_file_close(mutex->interproc);
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static apr_status_t proc_mutex_fcntl_create(apr_proc_mutex_t *new_mutex,
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new_mutex->fname = apr_pstrdup(new_mutex->pool, fname);
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rv = apr_file_open(&new_mutex->interproc, new_mutex->fname,
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APR_CREATE | APR_WRITE | APR_EXCL,
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APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD,
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new_mutex->fname = apr_pstrdup(new_mutex->pool, "/tmp/aprXXXXXX");
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rv = apr_file_mktemp(&new_mutex->interproc, new_mutex->fname,
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APR_CREATE | APR_WRITE | APR_EXCL,
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if (rv != APR_SUCCESS) {
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new_mutex->curr_locked = 0;
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unlink(new_mutex->fname);
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apr_pool_cleanup_register(new_mutex->pool,
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apr_proc_mutex_cleanup,
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apr_pool_cleanup_null);
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static apr_status_t proc_mutex_fcntl_acquire(apr_proc_mutex_t *mutex)
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rc = fcntl(mutex->interproc->filedes, F_SETLKW, &proc_mutex_lock_it);
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} while (rc < 0 && errno == EINTR);
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mutex->curr_locked=1;
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static apr_status_t proc_mutex_fcntl_release(apr_proc_mutex_t *mutex)
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mutex->curr_locked=0;
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rc = fcntl(mutex->interproc->filedes, F_SETLKW, &proc_mutex_unlock_it);
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} while (rc < 0 && errno == EINTR);
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static const apr_proc_mutex_unix_lock_methods_t mutex_fcntl_methods =
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#if APR_PROCESS_LOCK_IS_GLOBAL || !APR_HAS_THREADS || defined(FCNTL_IS_GLOBAL)
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APR_PROCESS_LOCK_MECH_IS_GLOBAL,
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proc_mutex_fcntl_create,
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proc_mutex_fcntl_acquire,
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proc_mutex_no_tryacquire,
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proc_mutex_fcntl_release,
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proc_mutex_fcntl_cleanup,
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proc_mutex_no_child_init,
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#endif /* fcntl implementation */
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#if APR_HAS_FLOCK_SERIALIZE
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static apr_status_t proc_mutex_flock_release(apr_proc_mutex_t *);
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static apr_status_t proc_mutex_flock_cleanup(void *mutex_)
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apr_proc_mutex_t *mutex=mutex_;
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if (mutex->curr_locked == 1) {
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status = proc_mutex_flock_release(mutex);
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if (status != APR_SUCCESS)
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if (mutex->interproc) { /* if it was opened properly */
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apr_file_close(mutex->interproc);
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unlink(mutex->fname);
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static apr_status_t proc_mutex_flock_create(apr_proc_mutex_t *new_mutex,
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new_mutex->fname = apr_pstrdup(new_mutex->pool, fname);
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rv = apr_file_open(&new_mutex->interproc, new_mutex->fname,
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APR_CREATE | APR_WRITE | APR_EXCL,
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APR_UREAD | APR_UWRITE,
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new_mutex->fname = apr_pstrdup(new_mutex->pool, "/tmp/aprXXXXXX");
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rv = apr_file_mktemp(&new_mutex->interproc, new_mutex->fname,
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APR_CREATE | APR_WRITE | APR_EXCL,
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if (rv != APR_SUCCESS) {
581
proc_mutex_flock_cleanup(new_mutex);
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new_mutex->curr_locked = 0;
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apr_pool_cleanup_register(new_mutex->pool, (void *)new_mutex,
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apr_proc_mutex_cleanup,
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apr_pool_cleanup_null);
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static apr_status_t proc_mutex_flock_acquire(apr_proc_mutex_t *mutex)
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rc = flock(mutex->interproc->filedes, LOCK_EX);
597
} while (rc < 0 && errno == EINTR);
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mutex->curr_locked = 1;
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static apr_status_t proc_mutex_flock_release(apr_proc_mutex_t *mutex)
609
mutex->curr_locked = 0;
611
rc = flock(mutex->interproc->filedes, LOCK_UN);
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} while (rc < 0 && errno == EINTR);
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static apr_status_t proc_mutex_flock_child_init(apr_proc_mutex_t **mutex,
623
apr_proc_mutex_t *new_mutex;
626
new_mutex = (apr_proc_mutex_t *)apr_palloc(pool, sizeof(apr_proc_mutex_t));
628
memcpy(new_mutex, *mutex, sizeof *new_mutex);
629
new_mutex->pool = pool;
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fname = (*mutex)->fname;
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new_mutex->fname = apr_pstrdup(pool, fname);
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rv = apr_file_open(&new_mutex->interproc, new_mutex->fname,
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APR_WRITE, 0, new_mutex->pool);
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if (rv != APR_SUCCESS) {
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static const apr_proc_mutex_unix_lock_methods_t mutex_flock_methods =
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#if APR_PROCESS_LOCK_IS_GLOBAL || !APR_HAS_THREADS || defined(FLOCK_IS_GLOBAL)
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APR_PROCESS_LOCK_MECH_IS_GLOBAL,
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proc_mutex_flock_create,
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proc_mutex_flock_acquire,
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proc_mutex_no_tryacquire,
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proc_mutex_flock_release,
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proc_mutex_flock_cleanup,
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proc_mutex_flock_child_init,
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#endif /* flock implementation */
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void apr_proc_mutex_unix_setup_lock(void)
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/* setup only needed for sysvsem and fnctl */
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#if APR_HAS_SYSVSEM_SERIALIZE
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proc_mutex_sysv_setup();
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#if APR_HAS_FCNTL_SERIALIZE
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proc_mutex_fcntl_setup();
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static apr_status_t proc_mutex_choose_method(apr_proc_mutex_t *new_mutex, apr_lockmech_e mech)
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#if APR_HAS_FCNTL_SERIALIZE
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new_mutex->inter_meth = &mutex_fcntl_methods;
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#if APR_HAS_FLOCK_SERIALIZE
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new_mutex->inter_meth = &mutex_flock_methods;
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case APR_LOCK_SYSVSEM:
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#if APR_HAS_SYSVSEM_SERIALIZE
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new_mutex->inter_meth = &mutex_sysv_methods;
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case APR_LOCK_POSIXSEM:
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#if APR_HAS_POSIXSEM_SERIALIZE
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new_mutex->inter_meth = &mutex_posixsem_methods;
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case APR_LOCK_PROC_PTHREAD:
704
#if APR_HAS_PROC_PTHREAD_SERIALIZE
705
new_mutex->inter_meth = &mutex_proc_pthread_methods;
710
case APR_LOCK_DEFAULT:
711
#if APR_USE_FLOCK_SERIALIZE
712
new_mutex->inter_meth = &mutex_flock_methods;
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#elif APR_USE_SYSVSEM_SERIALIZE
714
new_mutex->inter_meth = &mutex_sysv_methods;
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#elif APR_USE_FCNTL_SERIALIZE
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new_mutex->inter_meth = &mutex_fcntl_methods;
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#elif APR_USE_PROC_PTHREAD_SERIALIZE
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new_mutex->inter_meth = &mutex_proc_pthread_methods;
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#elif APR_USE_POSIXSEM_SERIALIZE
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new_mutex->inter_meth = &mutex_posixsem_methods;
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APR_DECLARE(const char *) apr_proc_mutex_defname(void)
734
apr_proc_mutex_t mutex;
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if ((rv = proc_mutex_choose_method(&mutex, APR_LOCK_DEFAULT)) != APR_SUCCESS) {
739
mutex.meth = mutex.inter_meth;
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return apr_proc_mutex_name(&mutex);
744
static apr_status_t proc_mutex_create(apr_proc_mutex_t *new_mutex, apr_lockmech_e mech, const char *fname)
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if ((rv = proc_mutex_choose_method(new_mutex, mech)) != APR_SUCCESS) {
752
new_mutex->meth = new_mutex->inter_meth;
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if ((rv = new_mutex->meth->create(new_mutex, fname)) != APR_SUCCESS) {
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APR_DECLARE(apr_status_t) apr_proc_mutex_create(apr_proc_mutex_t **mutex,
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apr_proc_mutex_t *new_mutex;
769
new_mutex = apr_pcalloc(pool, sizeof(apr_proc_mutex_t));
770
new_mutex->pool = pool;
772
if ((rv = proc_mutex_create(new_mutex, mech, fname)) != APR_SUCCESS)
779
APR_DECLARE(apr_status_t) apr_proc_mutex_child_init(apr_proc_mutex_t **mutex,
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return (*mutex)->meth->child_init(mutex, pool, fname);
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APR_DECLARE(apr_status_t) apr_proc_mutex_lock(apr_proc_mutex_t *mutex)
788
return mutex->meth->acquire(mutex);
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APR_DECLARE(apr_status_t) apr_proc_mutex_trylock(apr_proc_mutex_t *mutex)
793
return mutex->meth->tryacquire(mutex);
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APR_DECLARE(apr_status_t) apr_proc_mutex_unlock(apr_proc_mutex_t *mutex)
798
return mutex->meth->release(mutex);
801
APR_DECLARE(apr_status_t) apr_proc_mutex_cleanup(void *mutex)
803
return ((apr_proc_mutex_t *)mutex)->meth->cleanup(mutex);
806
APR_DECLARE(const char *) apr_proc_mutex_name(apr_proc_mutex_t *mutex)
808
return mutex->meth->name;
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APR_DECLARE(const char *) apr_proc_mutex_lockfile(apr_proc_mutex_t *mutex)
813
/* POSIX sems use the fname field but don't use a file,
815
#if APR_HAS_FLOCK_SERIALIZE
816
if (mutex->meth == &mutex_flock_methods) {
820
#if APR_HAS_FCNTL_SERIALIZE
821
if (mutex->meth == &mutex_fcntl_methods) {
828
APR_POOL_IMPLEMENT_ACCESSOR(proc_mutex)
830
/* Implement OS-specific accessors defined in apr_portable.h */
832
APR_DECLARE(apr_status_t) apr_os_proc_mutex_get(apr_os_proc_mutex_t *ospmutex,
833
apr_proc_mutex_t *pmutex)
835
#if APR_HAS_SYSVSEM_SERIALIZE || APR_HAS_FCNTL_SERIALIZE || APR_HAS_FLOCK_SERIALIZE || APR_HAS_POSIXSEM_SERIALIZE
836
ospmutex->crossproc = pmutex->interproc->filedes;
838
#if APR_HAS_PROC_PTHREAD_SERIALIZE
839
ospmutex->pthread_interproc = pmutex->pthread_interproc;
844
APR_DECLARE(apr_status_t) apr_os_proc_mutex_put(apr_proc_mutex_t **pmutex,
845
apr_os_proc_mutex_t *ospmutex,
851
if ((*pmutex) == NULL) {
852
(*pmutex) = (apr_proc_mutex_t *)apr_pcalloc(pool,
853
sizeof(apr_proc_mutex_t));
854
(*pmutex)->pool = pool;
856
#if APR_HAS_SYSVSEM_SERIALIZE || APR_HAS_FCNTL_SERIALIZE || APR_HAS_FLOCK_SERIALIZE || APR_HAS_POSIXSEM_SERIALIZE
857
apr_os_file_put(&(*pmutex)->interproc, &ospmutex->crossproc, 0, pool);
859
#if APR_HAS_PROC_PTHREAD_SERIALIZE
860
(*pmutex)->pthread_interproc = ospmutex->pthread_interproc;