apr_proc_mutex_child_init calls unimplemented OpenMutexW and will fail to

compile on Windows CE.  The patch implements the expected behavior of
OpenMutexW by calling CreateMutex (which will open an existing mutex or 
create one if it doesn't exist) and close the mutex and return an error 
unless CreateMutex indicated that the mutex already existed.

PR: 39858
Submitted by: Curt Arnold <carnold apache.org>
Reviewed by: Davi Arnaut
Backport: 543333


git-svn-id: http://svn.apache.org/repos/asf/apr/apr/branches/1.2.x@543334 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 9 insertions, 0 deletions

diff --git a/locks/win32/proc_mutex.c b/locks/win32/proc_mutex.c
index 9620a60d0..e60d5609f 100644
--- a/locks/win32/proc_mutex.c
+++ b/locks/win32/proc_mutex.c
@@ -98,6 +98,14 @@ APR_DECLARE(apr_status_t) apr_proc_mutex_child_init(apr_proc_mutex_t **mutex,
      */
     mutexkey = res_name_from_filename(fname, 1, pool);
 
+#if defined(_WIN32_WCE)
+    hMutex = CreateMutex(NULL, FALSE, mutexkey);
+    if (hMutex && ERROR_ALREADY_EXISTS != GetLastError()) {
+        CloseHandle(hMutex);
+        hMutex = NULL;
+        SetLastError(ERROR_FILE_NOT_FOUND);
+    }
+#else
 #if APR_HAS_UNICODE_FS
     IF_WIN_OS_IS_UNICODE
     {
@@ -110,6 +118,7 @@ APR_DECLARE(apr_status_t) apr_proc_mutex_child_init(apr_proc_mutex_t **mutex,
         hMutex = OpenMutexA(MUTEX_ALL_ACCESS, FALSE, mutexkey);
     }
 #endif
+#endif
 
     if (!hMutex) {
         return apr_get_os_error();