Edit: once.h
/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef ISC_ONCE_H #define ISC_ONCE_H 1 /*! \file */ #include <pthread.h> #include <isc/platform.h> #include <isc/result.h> typedef pthread_once_t isc_once_t; #ifdef ISC_PLATFORM_BRACEPTHREADONCEINIT /*! * This accommodates systems that define PTHRAD_ONCE_INIT improperly. */ #define ISC_ONCE_INIT { PTHREAD_ONCE_INIT } #else /*! * This is the usual case. */ #define ISC_ONCE_INIT PTHREAD_ONCE_INIT #endif /* XXX We could do fancier error handling... */ #define isc_once_do(op, f) \ ((pthread_once((op), (f)) == 0) ? \ ISC_R_SUCCESS : ISC_R_UNEXPECTED) #endif /* ISC_ONCE_H */
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