diff options
Diffstat (limited to 'locks/win32/thread_mutex.c')
| -rw-r--r-- | locks/win32/thread_mutex.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/locks/win32/thread_mutex.c b/locks/win32/thread_mutex.c new file mode 100644 index 0000000..f191524 --- /dev/null +++ b/locks/win32/thread_mutex.c @@ -0,0 +1,175 @@ +/* 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_private.h" +#include "apr_general.h" +#include "apr_strings.h" +#include "apr_arch_thread_mutex.h" +#include "apr_thread_mutex.h" +#include "apr_portable.h" +#include "apr_arch_misc.h" + +static apr_status_t thread_mutex_cleanup(void *data) +{ + apr_thread_mutex_t *lock = data; + + if (lock->type == thread_mutex_critical_section) { + lock->type = -1; + DeleteCriticalSection(&lock->section); + } + else { + if (!CloseHandle(lock->handle)) { + return apr_get_os_error(); + } + } + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_thread_mutex_create(apr_thread_mutex_t **mutex, + unsigned int flags, + apr_pool_t *pool) +{ + (*mutex) = (apr_thread_mutex_t *)apr_palloc(pool, sizeof(**mutex)); + + (*mutex)->pool = pool; + + if (flags & APR_THREAD_MUTEX_UNNESTED) { + /* Use an auto-reset signaled event, ready to accept one + * waiting thread. + */ + (*mutex)->type = thread_mutex_unnested_event; + (*mutex)->handle = CreateEvent(NULL, FALSE, TRUE, NULL); + } + else if (flags & APR_THREAD_MUTEX_TIMED) { + (*mutex)->type = thread_mutex_nested_mutex; + (*mutex)->handle = CreateMutex(NULL, FALSE, NULL); + } + else { +#if APR_HAS_UNICODE_FS + /* Critical Sections are terrific, performance-wise, on NT. + * On Win9x, we cannot 'try' on a critical section, so we + * use a [slower] mutex object, instead. + */ + IF_WIN_OS_IS_UNICODE { + InitializeCriticalSection(&(*mutex)->section); + (*mutex)->type = thread_mutex_critical_section; + (*mutex)->handle = NULL; + } +#endif +#if APR_HAS_ANSI_FS + ELSE_WIN_OS_IS_ANSI { + (*mutex)->type = thread_mutex_nested_mutex; + (*mutex)->handle = CreateMutex(NULL, FALSE, NULL); + + } +#endif + } + + apr_pool_cleanup_register((*mutex)->pool, (*mutex), thread_mutex_cleanup, + apr_pool_cleanup_null); + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_thread_mutex_lock(apr_thread_mutex_t *mutex) +{ + if (mutex->type == thread_mutex_critical_section) { + EnterCriticalSection(&mutex->section); + } + else { + DWORD rv = WaitForSingleObject(mutex->handle, INFINITE); + if ((rv != WAIT_OBJECT_0) && (rv != WAIT_ABANDONED)) { + return (rv == WAIT_TIMEOUT) ? APR_EBUSY : apr_get_os_error(); + } + } + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_thread_mutex_trylock(apr_thread_mutex_t *mutex) +{ + if (mutex->type == thread_mutex_critical_section) { + if (!TryEnterCriticalSection(&mutex->section)) { + return APR_EBUSY; + } + } + else { + DWORD rv = WaitForSingleObject(mutex->handle, 0); + if ((rv != WAIT_OBJECT_0) && (rv != WAIT_ABANDONED)) { + return (rv == WAIT_TIMEOUT) ? APR_EBUSY : apr_get_os_error(); + } + } + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_thread_mutex_timedlock(apr_thread_mutex_t *mutex, + apr_interval_time_t timeout) +{ + if (mutex->type != thread_mutex_critical_section) { + DWORD rv, timeout_ms = 0; + apr_interval_time_t t = timeout; + + do { + if (t > 0) { + /* Given timeout is 64bit usecs whereas Windows timeouts are + * 32bit msecs and below INFINITE (2^32 - 1), so we may need + * multiple timed out waits... + */ + if (t > apr_time_from_msec(INFINITE - 1)) { + timeout_ms = INFINITE - 1; + t -= apr_time_from_msec(INFINITE - 1); + } + else { + timeout_ms = (DWORD)apr_time_as_msec(t); + t = 0; + } + } + rv = WaitForSingleObject(mutex->handle, timeout_ms); + } while (rv == WAIT_TIMEOUT && t > 0); + + if ((rv != WAIT_OBJECT_0) && (rv != WAIT_ABANDONED)) { + return (rv == WAIT_TIMEOUT) ? APR_TIMEUP : apr_get_os_error(); + } + return APR_SUCCESS; + } + + return APR_ENOTIMPL; +} + +APR_DECLARE(apr_status_t) apr_thread_mutex_unlock(apr_thread_mutex_t *mutex) +{ + if (mutex->type == thread_mutex_critical_section) { + LeaveCriticalSection(&mutex->section); + } + else if (mutex->type == thread_mutex_unnested_event) { + if (!SetEvent(mutex->handle)) { + return apr_get_os_error(); + } + } + else if (mutex->type == thread_mutex_nested_mutex) { + if (!ReleaseMutex(mutex->handle)) { + return apr_get_os_error(); + } + } + return APR_SUCCESS; +} + +APR_DECLARE(apr_status_t) apr_thread_mutex_destroy(apr_thread_mutex_t *mutex) +{ + return apr_pool_cleanup_run(mutex->pool, mutex, thread_mutex_cleanup); +} + +APR_POOL_IMPLEMENT_ACCESSOR(thread_mutex) + |