diff options
Diffstat (limited to 'lib/isc/win32/once.c')
-rw-r--r-- | lib/isc/win32/once.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/lib/isc/win32/once.c b/lib/isc/win32/once.c new file mode 100644 index 0000000..b504776 --- /dev/null +++ b/lib/isc/win32/once.c @@ -0,0 +1,54 @@ +/* + * Copyright (C) 2004, 2007 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 1999-2001 Internet Software Consortium. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE + * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +/* $Id: once.c,v 1.12 2007/06/18 23:47:49 tbox Exp $ */ + +/* Principal Authors: DCL */ + +#include <config.h> + +#include <windows.h> + +#include <isc/once.h> +#include <isc/assertions.h> +#include <isc/util.h> + +isc_result_t +isc_once_do(isc_once_t *controller, void(*function)(void)) { + REQUIRE(controller != NULL && function != NULL); + + if (controller->status == ISC_ONCE_INIT_NEEDED) { + + if (InterlockedDecrement(&controller->counter) == 0) { + if (controller->status == ISC_ONCE_INIT_NEEDED) { + function(); + controller->status = ISC_ONCE_INIT_DONE; + } + } else { + while (controller->status == ISC_ONCE_INIT_NEEDED) { + /* + * Sleep(0) indicates that this thread + * should be suspended to allow other + * waiting threads to execute. + */ + Sleep(0); + } + } + } + + return (ISC_R_SUCCESS); +} |