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freebsd-dev/contrib/apr/locks/unix/proc_mutex.c
Peter Wemm 228f8555ff Merge apr-1.4.8 -> apr-1.5.1 and update.
2014-05-27 07:15:14 +00:00

988 lines
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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apr.h"
#include "apr_strings.h"
#include "apr_arch_proc_mutex.h"
#include "apr_arch_file_io.h" /* for apr_mkstemp() */
#include "apr_hash.h"
APR_DECLARE(apr_status_t) apr_proc_mutex_destroy(apr_proc_mutex_t *mutex)
{
return apr_pool_cleanup_run(mutex->pool, mutex, apr_proc_mutex_cleanup);
}
#if APR_HAS_POSIXSEM_SERIALIZE || APR_HAS_FCNTL_SERIALIZE || \
APR_HAS_PROC_PTHREAD_SERIALIZE || APR_HAS_SYSVSEM_SERIALIZE
static apr_status_t proc_mutex_no_child_init(apr_proc_mutex_t **mutex,
apr_pool_t *cont,
const char *fname)
{
return APR_SUCCESS;
}
#endif
#if APR_HAS_POSIXSEM_SERIALIZE
#ifndef SEM_FAILED
#define SEM_FAILED (-1)
#endif
static apr_status_t proc_mutex_posix_cleanup(void *mutex_)
{
apr_proc_mutex_t *mutex = mutex_;
if (sem_close(mutex->psem_interproc) < 0) {
return errno;
}
return APR_SUCCESS;
}
static unsigned int rshash (char *p) {
/* hash function from Robert Sedgwicks 'Algorithms in C' book */
unsigned int b = 378551;
unsigned int a = 63689;
unsigned int retval = 0;
for( ; *p; p++)
{
retval = retval * a + (*p);
a *= b;
}
return retval;
}
static apr_status_t proc_mutex_posix_create(apr_proc_mutex_t *new_mutex,
const char *fname)
{
#define APR_POSIXSEM_NAME_MIN 13
sem_t *psem;
char semname[32];
new_mutex->interproc = apr_palloc(new_mutex->pool,
sizeof(*new_mutex->interproc));
/*
* This bogusness is to follow what appears to be the
* lowest common denominator in Posix semaphore naming:
* - start with '/'
* - be at most 14 chars
* - be unique and not match anything on the filesystem
*
* Because of this, we use fname to generate a (unique) hash
* and use that as the name of the semaphore. If no filename was
* given, we create one based on the time. We tuck the name
* away, since it might be useful for debugging. We use 2 hashing
* functions to try to avoid collisions.
*
* To make this as robust as possible, we initially try something
* larger (and hopefully more unique) and gracefully fail down to the
* LCD above.
*
* NOTE: Darwin (Mac OS X) seems to be the most restrictive
* implementation. Versions previous to Darwin 6.2 had the 14
* char limit, but later rev's allow up to 31 characters.
*
*/
if (fname) {
apr_ssize_t flen = strlen(fname);
char *p = apr_pstrndup(new_mutex->pool, fname, strlen(fname));
unsigned int h1, h2;
h1 = (apr_hashfunc_default((const char *)p, &flen) & 0xffffffff);
h2 = (rshash(p) & 0xffffffff);
apr_snprintf(semname, sizeof(semname), "/ApR.%xH%x", h1, h2);
} else {
apr_time_t now;
unsigned long sec;
unsigned long usec;
now = apr_time_now();
sec = apr_time_sec(now);
usec = apr_time_usec(now);
apr_snprintf(semname, sizeof(semname), "/ApR.%lxZ%lx", sec, usec);
}
psem = sem_open(semname, O_CREAT | O_EXCL, 0644, 1);
if (psem == (sem_t *)SEM_FAILED) {
if (errno == ENAMETOOLONG) {
/* Oh well, good try */
semname[APR_POSIXSEM_NAME_MIN] = '\0';
} else {
return errno;
}
psem = sem_open(semname, O_CREAT | O_EXCL, 0644, 1);
}
if (psem == (sem_t *)SEM_FAILED) {
return errno;
}
/* Ahhh. The joys of Posix sems. Predelete it... */
sem_unlink(semname);
new_mutex->psem_interproc = psem;
new_mutex->fname = apr_pstrdup(new_mutex->pool, semname);
apr_pool_cleanup_register(new_mutex->pool, (void *)new_mutex,
apr_proc_mutex_cleanup,
apr_pool_cleanup_null);
return APR_SUCCESS;
}
static apr_status_t proc_mutex_posix_acquire(apr_proc_mutex_t *mutex)
{
if (sem_wait(mutex->psem_interproc) < 0) {
return errno;
}
mutex->curr_locked = 1;
return APR_SUCCESS;
}
static apr_status_t proc_mutex_posix_tryacquire(apr_proc_mutex_t *mutex)
{
if (sem_trywait(mutex->psem_interproc) < 0) {
if (errno == EAGAIN) {
return APR_EBUSY;
}
return errno;
}
mutex->curr_locked = 1;
return APR_SUCCESS;
}
static apr_status_t proc_mutex_posix_release(apr_proc_mutex_t *mutex)
{
mutex->curr_locked = 0;
if (sem_post(mutex->psem_interproc) < 0) {
/* any failure is probably fatal, so no big deal to leave
* ->curr_locked at 0. */
return errno;
}
return APR_SUCCESS;
}
static const apr_proc_mutex_unix_lock_methods_t mutex_posixsem_methods =
{
#if APR_PROCESS_LOCK_IS_GLOBAL || !APR_HAS_THREADS || defined(POSIXSEM_IS_GLOBAL)
APR_PROCESS_LOCK_MECH_IS_GLOBAL,
#else
0,
#endif
proc_mutex_posix_create,
proc_mutex_posix_acquire,
proc_mutex_posix_tryacquire,
proc_mutex_posix_release,
proc_mutex_posix_cleanup,
proc_mutex_no_child_init,
"posixsem"
};
#endif /* Posix sem implementation */
#if APR_HAS_SYSVSEM_SERIALIZE
static struct sembuf proc_mutex_op_on;
static struct sembuf proc_mutex_op_try;
static struct sembuf proc_mutex_op_off;
static void proc_mutex_sysv_setup(void)
{
proc_mutex_op_on.sem_num = 0;
proc_mutex_op_on.sem_op = -1;
proc_mutex_op_on.sem_flg = SEM_UNDO;
proc_mutex_op_try.sem_num = 0;
proc_mutex_op_try.sem_op = -1;
proc_mutex_op_try.sem_flg = SEM_UNDO | IPC_NOWAIT;
proc_mutex_op_off.sem_num = 0;
proc_mutex_op_off.sem_op = 1;
proc_mutex_op_off.sem_flg = SEM_UNDO;
}
static apr_status_t proc_mutex_sysv_cleanup(void *mutex_)
{
apr_proc_mutex_t *mutex=mutex_;
union semun ick;
if (mutex->interproc->filedes != -1) {
ick.val = 0;
semctl(mutex->interproc->filedes, 0, IPC_RMID, ick);
}
return APR_SUCCESS;
}
static apr_status_t proc_mutex_sysv_create(apr_proc_mutex_t *new_mutex,
const char *fname)
{
union semun ick;
apr_status_t rv;
new_mutex->interproc = apr_palloc(new_mutex->pool, sizeof(*new_mutex->interproc));
new_mutex->interproc->filedes = semget(IPC_PRIVATE, 1, IPC_CREAT | 0600);
if (new_mutex->interproc->filedes < 0) {
rv = errno;
proc_mutex_sysv_cleanup(new_mutex);
return rv;
}
ick.val = 1;
if (semctl(new_mutex->interproc->filedes, 0, SETVAL, ick) < 0) {
rv = errno;
proc_mutex_sysv_cleanup(new_mutex);
return rv;
}
new_mutex->curr_locked = 0;
apr_pool_cleanup_register(new_mutex->pool,
(void *)new_mutex, apr_proc_mutex_cleanup,
apr_pool_cleanup_null);
return APR_SUCCESS;
}
static apr_status_t proc_mutex_sysv_acquire(apr_proc_mutex_t *mutex)
{
int rc;
do {
rc = semop(mutex->interproc->filedes, &proc_mutex_op_on, 1);
} while (rc < 0 && errno == EINTR);
if (rc < 0) {
return errno;
}
mutex->curr_locked = 1;
return APR_SUCCESS;
}
static apr_status_t proc_mutex_sysv_tryacquire(apr_proc_mutex_t *mutex)
{
int rc;
do {
rc = semop(mutex->interproc->filedes, &proc_mutex_op_try, 1);
} while (rc < 0 && errno == EINTR);
if (rc < 0) {
if (errno == EAGAIN) {
return APR_EBUSY;
}
return errno;
}
mutex->curr_locked = 1;
return APR_SUCCESS;
}
static apr_status_t proc_mutex_sysv_release(apr_proc_mutex_t *mutex)
{
int rc;
mutex->curr_locked = 0;
do {
rc = semop(mutex->interproc->filedes, &proc_mutex_op_off, 1);
} while (rc < 0 && errno == EINTR);
if (rc < 0) {
return errno;
}
return APR_SUCCESS;
}
static const apr_proc_mutex_unix_lock_methods_t mutex_sysv_methods =
{
#if APR_PROCESS_LOCK_IS_GLOBAL || !APR_HAS_THREADS || defined(SYSVSEM_IS_GLOBAL)
APR_PROCESS_LOCK_MECH_IS_GLOBAL,
#else
0,
#endif
proc_mutex_sysv_create,
proc_mutex_sysv_acquire,
proc_mutex_sysv_tryacquire,
proc_mutex_sysv_release,
proc_mutex_sysv_cleanup,
proc_mutex_no_child_init,
"sysvsem"
};
#endif /* SysV sem implementation */
#if APR_HAS_PROC_PTHREAD_SERIALIZE
static apr_status_t proc_mutex_proc_pthread_cleanup(void *mutex_)
{
apr_proc_mutex_t *mutex=mutex_;
apr_status_t rv;
if (mutex->curr_locked == 1) {
if ((rv = pthread_mutex_unlock(mutex->pthread_interproc))) {
#ifdef HAVE_ZOS_PTHREADS
rv = errno;
#endif
return rv;
}
}
/* curr_locked is set to -1 until the mutex has been created */
if (mutex->curr_locked != -1) {
if ((rv = pthread_mutex_destroy(mutex->pthread_interproc))) {
#ifdef HAVE_ZOS_PTHREADS
rv = errno;
#endif
return rv;
}
}
if (munmap((caddr_t)mutex->pthread_interproc, sizeof(pthread_mutex_t))) {
return errno;
}
return APR_SUCCESS;
}
static apr_status_t proc_mutex_proc_pthread_create(apr_proc_mutex_t *new_mutex,
const char *fname)
{
apr_status_t rv;
int fd;
pthread_mutexattr_t mattr;
fd = open("/dev/zero", O_RDWR);
if (fd < 0) {
return errno;
}
new_mutex->pthread_interproc = (pthread_mutex_t *)mmap(
(caddr_t) 0,
sizeof(pthread_mutex_t),
PROT_READ | PROT_WRITE, MAP_SHARED,
fd, 0);
if (new_mutex->pthread_interproc == (pthread_mutex_t *) (caddr_t) -1) {
close(fd);
return errno;
}
close(fd);
new_mutex->curr_locked = -1; /* until the mutex has been created */
if ((rv = pthread_mutexattr_init(&mattr))) {
#ifdef HAVE_ZOS_PTHREADS
rv = errno;
#endif
proc_mutex_proc_pthread_cleanup(new_mutex);
return rv;
}
if ((rv = pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED))) {
#ifdef HAVE_ZOS_PTHREADS
rv = errno;
#endif
proc_mutex_proc_pthread_cleanup(new_mutex);
pthread_mutexattr_destroy(&mattr);
return rv;
}
#ifdef HAVE_PTHREAD_MUTEX_ROBUST
if ((rv = pthread_mutexattr_setrobust_np(&mattr,
PTHREAD_MUTEX_ROBUST_NP))) {
#ifdef HAVE_ZOS_PTHREADS
rv = errno;
#endif
proc_mutex_proc_pthread_cleanup(new_mutex);
pthread_mutexattr_destroy(&mattr);
return rv;
}
if ((rv = pthread_mutexattr_setprotocol(&mattr, PTHREAD_PRIO_INHERIT))) {
#ifdef HAVE_ZOS_PTHREADS
rv = errno;
#endif
proc_mutex_proc_pthread_cleanup(new_mutex);
pthread_mutexattr_destroy(&mattr);
return rv;
}
#endif /* HAVE_PTHREAD_MUTEX_ROBUST */
if ((rv = pthread_mutex_init(new_mutex->pthread_interproc, &mattr))) {
#ifdef HAVE_ZOS_PTHREADS
rv = errno;
#endif
proc_mutex_proc_pthread_cleanup(new_mutex);
pthread_mutexattr_destroy(&mattr);
return rv;
}
new_mutex->curr_locked = 0; /* mutex created now */
if ((rv = pthread_mutexattr_destroy(&mattr))) {
#ifdef HAVE_ZOS_PTHREADS
rv = errno;
#endif
proc_mutex_proc_pthread_cleanup(new_mutex);
return rv;
}
apr_pool_cleanup_register(new_mutex->pool,
(void *)new_mutex,
apr_proc_mutex_cleanup,
apr_pool_cleanup_null);
return APR_SUCCESS;
}
static apr_status_t proc_mutex_proc_pthread_acquire(apr_proc_mutex_t *mutex)
{
apr_status_t rv;
if ((rv = pthread_mutex_lock(mutex->pthread_interproc))) {
#ifdef HAVE_ZOS_PTHREADS
rv = errno;
#endif
#ifdef HAVE_PTHREAD_MUTEX_ROBUST
/* Okay, our owner died. Let's try to make it consistent again. */
if (rv == EOWNERDEAD) {
pthread_mutex_consistent_np(mutex->pthread_interproc);
}
else
return rv;
#else
return rv;
#endif
}
mutex->curr_locked = 1;
return APR_SUCCESS;
}
static apr_status_t proc_mutex_proc_pthread_tryacquire(apr_proc_mutex_t *mutex)
{
apr_status_t rv;
if ((rv = pthread_mutex_trylock(mutex->pthread_interproc))) {
#ifdef HAVE_ZOS_PTHREADS
rv = errno;
#endif
if (rv == EBUSY) {
return APR_EBUSY;
}
#ifdef HAVE_PTHREAD_MUTEX_ROBUST
/* Okay, our owner died. Let's try to make it consistent again. */
if (rv == EOWNERDEAD) {
pthread_mutex_consistent_np(mutex->pthread_interproc);
rv = APR_SUCCESS;
}
else
return rv;
#else
return rv;
#endif
}
mutex->curr_locked = 1;
return rv;
}
static apr_status_t proc_mutex_proc_pthread_release(apr_proc_mutex_t *mutex)
{
apr_status_t rv;
mutex->curr_locked = 0;
if ((rv = pthread_mutex_unlock(mutex->pthread_interproc))) {
#ifdef HAVE_ZOS_PTHREADS
rv = errno;
#endif
return rv;
}
return APR_SUCCESS;
}
static const apr_proc_mutex_unix_lock_methods_t mutex_proc_pthread_methods =
{
APR_PROCESS_LOCK_MECH_IS_GLOBAL,
proc_mutex_proc_pthread_create,
proc_mutex_proc_pthread_acquire,
proc_mutex_proc_pthread_tryacquire,
proc_mutex_proc_pthread_release,
proc_mutex_proc_pthread_cleanup,
proc_mutex_no_child_init,
"pthread"
};
#endif
#if APR_HAS_FCNTL_SERIALIZE
static struct flock proc_mutex_lock_it;
static struct flock proc_mutex_unlock_it;
static apr_status_t proc_mutex_fcntl_release(apr_proc_mutex_t *);
static void proc_mutex_fcntl_setup(void)
{
proc_mutex_lock_it.l_whence = SEEK_SET; /* from current point */
proc_mutex_lock_it.l_start = 0; /* -"- */
proc_mutex_lock_it.l_len = 0; /* until end of file */
proc_mutex_lock_it.l_type = F_WRLCK; /* set exclusive/write lock */
proc_mutex_lock_it.l_pid = 0; /* pid not actually interesting */
proc_mutex_unlock_it.l_whence = SEEK_SET; /* from current point */
proc_mutex_unlock_it.l_start = 0; /* -"- */
proc_mutex_unlock_it.l_len = 0; /* until end of file */
proc_mutex_unlock_it.l_type = F_UNLCK; /* set exclusive/write lock */
proc_mutex_unlock_it.l_pid = 0; /* pid not actually interesting */
}
static apr_status_t proc_mutex_fcntl_cleanup(void *mutex_)
{
apr_status_t status;
apr_proc_mutex_t *mutex=mutex_;
if (mutex->curr_locked == 1) {
status = proc_mutex_fcntl_release(mutex);
if (status != APR_SUCCESS)
return status;
}
return apr_file_close(mutex->interproc);
}
static apr_status_t proc_mutex_fcntl_create(apr_proc_mutex_t *new_mutex,
const char *fname)
{
int rv;
if (fname) {
new_mutex->fname = apr_pstrdup(new_mutex->pool, fname);
rv = apr_file_open(&new_mutex->interproc, new_mutex->fname,
APR_FOPEN_CREATE | APR_FOPEN_WRITE | APR_FOPEN_EXCL,
APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD,
new_mutex->pool);
}
else {
new_mutex->fname = apr_pstrdup(new_mutex->pool, "/tmp/aprXXXXXX");
rv = apr_file_mktemp(&new_mutex->interproc, new_mutex->fname,
APR_FOPEN_CREATE | APR_FOPEN_WRITE | APR_FOPEN_EXCL,
new_mutex->pool);
}
if (rv != APR_SUCCESS) {
return rv;
}
new_mutex->curr_locked = 0;
unlink(new_mutex->fname);
apr_pool_cleanup_register(new_mutex->pool,
(void*)new_mutex,
apr_proc_mutex_cleanup,
apr_pool_cleanup_null);
return APR_SUCCESS;
}
static apr_status_t proc_mutex_fcntl_acquire(apr_proc_mutex_t *mutex)
{
int rc;
do {
rc = fcntl(mutex->interproc->filedes, F_SETLKW, &proc_mutex_lock_it);
} while (rc < 0 && errno == EINTR);
if (rc < 0) {
return errno;
}
mutex->curr_locked=1;
return APR_SUCCESS;
}
static apr_status_t proc_mutex_fcntl_tryacquire(apr_proc_mutex_t *mutex)
{
int rc;
do {
rc = fcntl(mutex->interproc->filedes, F_SETLK, &proc_mutex_lock_it);
} while (rc < 0 && errno == EINTR);
if (rc < 0) {
#if FCNTL_TRYACQUIRE_EACCES
if (errno == EACCES) {
#else
if (errno == EAGAIN) {
#endif
return APR_EBUSY;
}
return errno;
}
mutex->curr_locked = 1;
return APR_SUCCESS;
}
static apr_status_t proc_mutex_fcntl_release(apr_proc_mutex_t *mutex)
{
int rc;
mutex->curr_locked=0;
do {
rc = fcntl(mutex->interproc->filedes, F_SETLKW, &proc_mutex_unlock_it);
} while (rc < 0 && errno == EINTR);
if (rc < 0) {
return errno;
}
return APR_SUCCESS;
}
static const apr_proc_mutex_unix_lock_methods_t mutex_fcntl_methods =
{
#if APR_PROCESS_LOCK_IS_GLOBAL || !APR_HAS_THREADS || defined(FCNTL_IS_GLOBAL)
APR_PROCESS_LOCK_MECH_IS_GLOBAL,
#else
0,
#endif
proc_mutex_fcntl_create,
proc_mutex_fcntl_acquire,
proc_mutex_fcntl_tryacquire,
proc_mutex_fcntl_release,
proc_mutex_fcntl_cleanup,
proc_mutex_no_child_init,
"fcntl"
};
#endif /* fcntl implementation */
#if APR_HAS_FLOCK_SERIALIZE
static apr_status_t proc_mutex_flock_release(apr_proc_mutex_t *);
static apr_status_t proc_mutex_flock_cleanup(void *mutex_)
{
apr_status_t status;
apr_proc_mutex_t *mutex=mutex_;
if (mutex->curr_locked == 1) {
status = proc_mutex_flock_release(mutex);
if (status != APR_SUCCESS)
return status;
}
if (mutex->interproc) { /* if it was opened properly */
apr_file_close(mutex->interproc);
}
unlink(mutex->fname);
return APR_SUCCESS;
}
static apr_status_t proc_mutex_flock_create(apr_proc_mutex_t *new_mutex,
const char *fname)
{
int rv;
if (fname) {
new_mutex->fname = apr_pstrdup(new_mutex->pool, fname);
rv = apr_file_open(&new_mutex->interproc, new_mutex->fname,
APR_FOPEN_CREATE | APR_FOPEN_WRITE | APR_FOPEN_EXCL,
APR_UREAD | APR_UWRITE,
new_mutex->pool);
}
else {
new_mutex->fname = apr_pstrdup(new_mutex->pool, "/tmp/aprXXXXXX");
rv = apr_file_mktemp(&new_mutex->interproc, new_mutex->fname,
APR_FOPEN_CREATE | APR_FOPEN_WRITE | APR_FOPEN_EXCL,
new_mutex->pool);
}
if (rv != APR_SUCCESS) {
proc_mutex_flock_cleanup(new_mutex);
return errno;
}
new_mutex->curr_locked = 0;
apr_pool_cleanup_register(new_mutex->pool, (void *)new_mutex,
apr_proc_mutex_cleanup,
apr_pool_cleanup_null);
return APR_SUCCESS;
}
static apr_status_t proc_mutex_flock_acquire(apr_proc_mutex_t *mutex)
{
int rc;
do {
rc = flock(mutex->interproc->filedes, LOCK_EX);
} while (rc < 0 && errno == EINTR);
if (rc < 0) {
return errno;
}
mutex->curr_locked = 1;
return APR_SUCCESS;
}
static apr_status_t proc_mutex_flock_tryacquire(apr_proc_mutex_t *mutex)
{
int rc;
do {
rc = flock(mutex->interproc->filedes, LOCK_EX | LOCK_NB);
} while (rc < 0 && errno == EINTR);
if (rc < 0) {
if (errno == EWOULDBLOCK || errno == EAGAIN) {
return APR_EBUSY;
}
return errno;
}
mutex->curr_locked = 1;
return APR_SUCCESS;
}
static apr_status_t proc_mutex_flock_release(apr_proc_mutex_t *mutex)
{
int rc;
mutex->curr_locked = 0;
do {
rc = flock(mutex->interproc->filedes, LOCK_UN);
} while (rc < 0 && errno == EINTR);
if (rc < 0) {
return errno;
}
return APR_SUCCESS;
}
static apr_status_t proc_mutex_flock_child_init(apr_proc_mutex_t **mutex,
apr_pool_t *pool,
const char *fname)
{
apr_proc_mutex_t *new_mutex;
int rv;
new_mutex = (apr_proc_mutex_t *)apr_palloc(pool, sizeof(apr_proc_mutex_t));
memcpy(new_mutex, *mutex, sizeof *new_mutex);
new_mutex->pool = pool;
if (!fname) {
fname = (*mutex)->fname;
}
new_mutex->fname = apr_pstrdup(pool, fname);
rv = apr_file_open(&new_mutex->interproc, new_mutex->fname,
APR_FOPEN_WRITE, 0, new_mutex->pool);
if (rv != APR_SUCCESS) {
return rv;
}
*mutex = new_mutex;
return APR_SUCCESS;
}
static const apr_proc_mutex_unix_lock_methods_t mutex_flock_methods =
{
#if APR_PROCESS_LOCK_IS_GLOBAL || !APR_HAS_THREADS || defined(FLOCK_IS_GLOBAL)
APR_PROCESS_LOCK_MECH_IS_GLOBAL,
#else
0,
#endif
proc_mutex_flock_create,
proc_mutex_flock_acquire,
proc_mutex_flock_tryacquire,
proc_mutex_flock_release,
proc_mutex_flock_cleanup,
proc_mutex_flock_child_init,
"flock"
};
#endif /* flock implementation */
void apr_proc_mutex_unix_setup_lock(void)
{
/* setup only needed for sysvsem and fnctl */
#if APR_HAS_SYSVSEM_SERIALIZE
proc_mutex_sysv_setup();
#endif
#if APR_HAS_FCNTL_SERIALIZE
proc_mutex_fcntl_setup();
#endif
}
static apr_status_t proc_mutex_choose_method(apr_proc_mutex_t *new_mutex, apr_lockmech_e mech)
{
switch (mech) {
case APR_LOCK_FCNTL:
#if APR_HAS_FCNTL_SERIALIZE
new_mutex->inter_meth = &mutex_fcntl_methods;
#else
return APR_ENOTIMPL;
#endif
break;
case APR_LOCK_FLOCK:
#if APR_HAS_FLOCK_SERIALIZE
new_mutex->inter_meth = &mutex_flock_methods;
#else
return APR_ENOTIMPL;
#endif
break;
case APR_LOCK_SYSVSEM:
#if APR_HAS_SYSVSEM_SERIALIZE
new_mutex->inter_meth = &mutex_sysv_methods;
#else
return APR_ENOTIMPL;
#endif
break;
case APR_LOCK_POSIXSEM:
#if APR_HAS_POSIXSEM_SERIALIZE
new_mutex->inter_meth = &mutex_posixsem_methods;
#else
return APR_ENOTIMPL;
#endif
break;
case APR_LOCK_PROC_PTHREAD:
#if APR_HAS_PROC_PTHREAD_SERIALIZE
new_mutex->inter_meth = &mutex_proc_pthread_methods;
#else
return APR_ENOTIMPL;
#endif
break;
case APR_LOCK_DEFAULT:
#if APR_USE_FLOCK_SERIALIZE
new_mutex->inter_meth = &mutex_flock_methods;
#elif APR_USE_SYSVSEM_SERIALIZE
new_mutex->inter_meth = &mutex_sysv_methods;
#elif APR_USE_FCNTL_SERIALIZE
new_mutex->inter_meth = &mutex_fcntl_methods;
#elif APR_USE_PROC_PTHREAD_SERIALIZE
new_mutex->inter_meth = &mutex_proc_pthread_methods;
#elif APR_USE_POSIXSEM_SERIALIZE
new_mutex->inter_meth = &mutex_posixsem_methods;
#else
return APR_ENOTIMPL;
#endif
break;
default:
return APR_ENOTIMPL;
}
return APR_SUCCESS;
}
APR_DECLARE(const char *) apr_proc_mutex_defname(void)
{
apr_status_t rv;
apr_proc_mutex_t mutex;
if ((rv = proc_mutex_choose_method(&mutex, APR_LOCK_DEFAULT)) != APR_SUCCESS) {
return "unknown";
}
mutex.meth = mutex.inter_meth;
return apr_proc_mutex_name(&mutex);
}
static apr_status_t proc_mutex_create(apr_proc_mutex_t *new_mutex, apr_lockmech_e mech, const char *fname)
{
apr_status_t rv;
if ((rv = proc_mutex_choose_method(new_mutex, mech)) != APR_SUCCESS) {
return rv;
}
new_mutex->meth = new_mutex->inter_meth;
if ((rv = new_mutex->meth->create(new_mutex, fname)) != APR_SUCCESS) {
return rv;
}
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_proc_mutex_create(apr_proc_mutex_t **mutex,
const char *fname,
apr_lockmech_e mech,
apr_pool_t *pool)
{
apr_proc_mutex_t *new_mutex;
apr_status_t rv;
new_mutex = apr_pcalloc(pool, sizeof(apr_proc_mutex_t));
new_mutex->pool = pool;
if ((rv = proc_mutex_create(new_mutex, mech, fname)) != APR_SUCCESS)
return rv;
*mutex = new_mutex;
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_proc_mutex_child_init(apr_proc_mutex_t **mutex,
const char *fname,
apr_pool_t *pool)
{
return (*mutex)->meth->child_init(mutex, pool, fname);
}
APR_DECLARE(apr_status_t) apr_proc_mutex_lock(apr_proc_mutex_t *mutex)
{
return mutex->meth->acquire(mutex);
}
APR_DECLARE(apr_status_t) apr_proc_mutex_trylock(apr_proc_mutex_t *mutex)
{
return mutex->meth->tryacquire(mutex);
}
APR_DECLARE(apr_status_t) apr_proc_mutex_unlock(apr_proc_mutex_t *mutex)
{
return mutex->meth->release(mutex);
}
APR_DECLARE(apr_status_t) apr_proc_mutex_cleanup(void *mutex)
{
return ((apr_proc_mutex_t *)mutex)->meth->cleanup(mutex);
}
APR_DECLARE(const char *) apr_proc_mutex_name(apr_proc_mutex_t *mutex)
{
return mutex->meth->name;
}
APR_DECLARE(const char *) apr_proc_mutex_lockfile(apr_proc_mutex_t *mutex)
{
/* POSIX sems use the fname field but don't use a file,
* so be careful. */
#if APR_HAS_FLOCK_SERIALIZE
if (mutex->meth == &mutex_flock_methods) {
return mutex->fname;
}
#endif
#if APR_HAS_FCNTL_SERIALIZE
if (mutex->meth == &mutex_fcntl_methods) {
return mutex->fname;
}
#endif
return NULL;
}
APR_POOL_IMPLEMENT_ACCESSOR(proc_mutex)
/* Implement OS-specific accessors defined in apr_portable.h */
APR_DECLARE(apr_status_t) apr_os_proc_mutex_get(apr_os_proc_mutex_t *ospmutex,
apr_proc_mutex_t *pmutex)
{
#if APR_HAS_SYSVSEM_SERIALIZE || APR_HAS_FCNTL_SERIALIZE || APR_HAS_FLOCK_SERIALIZE || APR_HAS_POSIXSEM_SERIALIZE
if (pmutex->interproc) {
ospmutex->crossproc = pmutex->interproc->filedes;
}
else {
ospmutex->crossproc = -1;
}
#endif
#if APR_HAS_PROC_PTHREAD_SERIALIZE
ospmutex->pthread_interproc = pmutex->pthread_interproc;
#endif
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_os_proc_mutex_put(apr_proc_mutex_t **pmutex,
apr_os_proc_mutex_t *ospmutex,
apr_pool_t *pool)
{
if (pool == NULL) {
return APR_ENOPOOL;
}
if ((*pmutex) == NULL) {
(*pmutex) = (apr_proc_mutex_t *)apr_pcalloc(pool,
sizeof(apr_proc_mutex_t));
(*pmutex)->pool = pool;
}
#if APR_HAS_SYSVSEM_SERIALIZE || APR_HAS_FCNTL_SERIALIZE || APR_HAS_FLOCK_SERIALIZE || APR_HAS_POSIXSEM_SERIALIZE
apr_os_file_put(&(*pmutex)->interproc, &ospmutex->crossproc, 0, pool);
#endif
#if APR_HAS_PROC_PTHREAD_SERIALIZE
(*pmutex)->pthread_interproc = ospmutex->pthread_interproc;
#endif
return APR_SUCCESS;
}
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