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/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
* applicable.
*
* Licensed 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_general.h"
#include "apr_lib.h"
#include "apr_strings.h"
#include "apr_portable.h"
#include "apr_arch_proc_mutex.h"
#include "apr_arch_file_io.h"
#include <string.h>
#include <stddef.h>
#define CurrentTid (*_threadid)
static char *fixed_name(const char *fname, apr_pool_t *pool)
{
char *semname;
if (fname == NULL)
semname = NULL;
else {
// Semaphores don't live in the file system, fix up the name
while (*fname == '/' || *fname == '\\') {
fname++;
}
semname = apr_pstrcat(pool, "/SEM32/", fname, NULL);
if (semname[8] == ':') {
semname[8] = '$';
}
}
return semname;
}
APR_DECLARE(apr_status_t) apr_proc_mutex_cleanup(void *vmutex)
{
apr_proc_mutex_t *mutex = vmutex;
return apr_proc_mutex_destroy(mutex);
}
APR_DECLARE(const char *) apr_proc_mutex_lockfile(apr_proc_mutex_t *mutex)
{
return NULL;
}
APR_DECLARE(const char *) apr_proc_mutex_name(apr_proc_mutex_t *mutex)
{
return "os2sem";
}
APR_DECLARE(const char *) apr_proc_mutex_defname(void)
{
return "os2sem";
}
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;
ULONG rc;
char *semname;
if (mech != APR_LOCK_DEFAULT) {
return APR_ENOTIMPL;
}
new = (apr_proc_mutex_t *)apr_palloc(pool, sizeof(apr_proc_mutex_t));
new->pool = pool;
new->owner = 0;
new->lock_count = 0;
*mutex = new;
semname = fixed_name(fname, pool);
rc = DosCreateMutexSem(semname, &(new->hMutex), DC_SEM_SHARED, FALSE);
if (!rc) {
apr_pool_cleanup_register(pool, new, apr_proc_mutex_cleanup, apr_pool_cleanup_null);
}
return APR_FROM_OS_ERROR(rc);
}
APR_DECLARE(apr_status_t) apr_proc_mutex_child_init(apr_proc_mutex_t **mutex,
const char *fname,
apr_pool_t *pool)
{
apr_proc_mutex_t *new;
ULONG rc;
char *semname;
new = (apr_proc_mutex_t *)apr_palloc(pool, sizeof(apr_proc_mutex_t));
new->pool = pool;
new->owner = 0;
new->lock_count = 0;
semname = fixed_name(fname, pool);
rc = DosOpenMutexSem(semname, &(new->hMutex));
*mutex = new;
if (!rc) {
apr_pool_cleanup_register(pool, new, apr_proc_mutex_cleanup, apr_pool_cleanup_null);
}
return APR_FROM_OS_ERROR(rc);
}
APR_DECLARE(apr_status_t) apr_proc_mutex_lock(apr_proc_mutex_t *mutex)
{
ULONG rc = DosRequestMutexSem(mutex->hMutex, SEM_INDEFINITE_WAIT);
if (rc == 0) {
mutex->owner = CurrentTid;
mutex->lock_count++;
}
return APR_FROM_OS_ERROR(rc);
}
APR_DECLARE(apr_status_t) apr_proc_mutex_trylock(apr_proc_mutex_t *mutex)
{
ULONG rc = DosRequestMutexSem(mutex->hMutex, SEM_IMMEDIATE_RETURN);
if (rc == 0) {
mutex->owner = CurrentTid;
mutex->lock_count++;
}
return APR_FROM_OS_ERROR(rc);
}
APR_DECLARE(apr_status_t) apr_proc_mutex_unlock(apr_proc_mutex_t *mutex)
{
ULONG rc;
if (mutex->owner == CurrentTid && mutex->lock_count > 0) {
mutex->lock_count--;
rc = DosReleaseMutexSem(mutex->hMutex);
return APR_FROM_OS_ERROR(rc);
}
return APR_SUCCESS;
}
APR_DECLARE(apr_status_t) apr_proc_mutex_destroy(apr_proc_mutex_t *mutex)
{
ULONG rc;
apr_status_t status = APR_SUCCESS;
if (mutex->owner == CurrentTid) {
while (mutex->lock_count > 0 && status == APR_SUCCESS) {
status = apr_proc_mutex_unlock(mutex);
}
}
if (status != APR_SUCCESS) {
return status;
}
if (mutex->hMutex == 0) {
return APR_SUCCESS;
}
rc = DosCloseMutexSem(mutex->hMutex);
if (!rc) {
mutex->hMutex = 0;
}
return APR_FROM_OS_ERROR(rc);
}
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)
{
*ospmutex = pmutex->hMutex;
return APR_ENOTIMPL;
}
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)
{
apr_proc_mutex_t *new;
new = (apr_proc_mutex_t *)apr_palloc(pool, sizeof(apr_proc_mutex_t));
new->pool = pool;
new->owner = 0;
new->lock_count = 0;
new->hMutex = *ospmutex;
*pmutex = new;
return APR_SUCCESS;
}
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