/* Copyright (C) 2010 The Trustees of Indiana University.                  *//*                                                                         *//* Use, modification and distribution is subject to the Boost Software     *//* License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at *//* http://www.boost.org/LICENSE_1_0.txt)                                   *//*                                                                         *//*  Authors: Jeremiah Willcock                                             *//*           Andrew Lumsdaine                                              */ #ifndef UTILS_H#define UTILS_H #include <stddef.h>#include <stdint.h>#include "splittable_mrg.h"#ifdef __MTA__#include <sys/mta_task.h>#endif #ifdef __cplusplusextern "C" {#endif void* xmalloc(size_t n);void* xcalloc(size_t n, size_t k);uint_fast64_t random_up_to(mrg_state* st, uint_fast64_t n);void make_mrg_seed(uint64_t userseed1, uint64_t userseed2, uint_fast32_t* seed); /* Compare-and-swap; return 1 if successful or 0 otherwise. */#ifdef __MTA__#pragma mta inlinestatic inline int int64_t_cas(volatile int64_t* p, int64_t oldval, int64_t newval) {  int64_t val = readfe(p);  if (val == oldval) {    writeef(p, newval);    return 1;  } else {    writeef(p, val);    return 0;  }}#elif defined(GRAPH_GENERATOR_MPI) || defined(GRAPH_GENERATOR_SEQ)/* Sequential */static inline int int64_t_cas(int64_t* p, int64_t oldval, int64_t newval) {  if (*p == oldval) {    *p = newval;    return 1;  } else {    return 0;  }}#elif defined(GRAPH_GENERATOR_OMP)/* GCC intrinsic */static inline int int64_t_cas(volatile int64_t* p, int64_t oldval, int64_t newval) {  return __sync_bool_compare_and_swap(p, oldval, newval);}#else#error "Need to define int64_t_cas() for your system"#endif #ifdef __cplusplus}#endif #endif /* UTILS_H */