pthread_cleanup.h

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/*
 * Copyright (C) 2014 René Kijewski <rene.kijewski@fu-berlin.de>
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#ifdef __cplusplus
extern "C" {
#endif

typedef struct __pthread_cleanup_datum
{
    struct __pthread_cleanup_datum *__next;

    void (*__routine)(void *arg);

    void *__arg;
} __pthread_cleanup_datum_t;

void __pthread_cleanup_push(__pthread_cleanup_datum_t *datum);

void __pthread_cleanup_pop(__pthread_cleanup_datum_t *datum, int execute);
 
/*
 * Notice: `pthread_cleanup_*` has to be defined as a macro, because the cleanup
 * stack needs extra data. The standard explicitly allows defining these
 * functions as macros.   The alternative would be malloc.
 */

#define pthread_cleanup_push(ROUTINE, ARG) \
    do { \
        __extension__ __pthread_cleanup_datum_t ____datum__ = { \
            .__routine = (ROUTINE), \
            .__arg = (ARG), \
        }; \
        __extension__ int ____execute__ = 1; \
        __pthread_cleanup_push(&____datum__); \
        do { \
            do { } while (0)

#define pthread_cleanup_pop(EXECUTE) \
            ____execute__ = (EXECUTE); \
        } while (0); \
        __pthread_cleanup_pop(&____datum__, ____execute__); \
    } while (0)
 
#ifdef __cplusplus
}
#endif