zos-tls.h

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// Licensed Materials - Property of IBM
// ZOSLIB
// (C) Copyright IBM Corp. 2020. All Rights Reserved.
// US Government Users Restricted Rights - Use, duplication
// or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 
// TODO(gabylb): zos - revisit when thread_local is implemented.
// APIs that implement Thread-local storage support.
 
#ifndef ZOS_TLS_H_
#define ZOS_TLS_H_
 
#include "zos-macros.h"
 
#ifdef __cplusplus
#include <unistd.h>
 
struct __Z_EXPORT __tlsanchor;
__Z_EXPORT struct __tlsanchor* __tlsvaranchor_create(size_t sz);
__Z_EXPORT void __tlsvaranchor_destroy(struct __tlsanchor *anchor);
__Z_EXPORT void* __tlsPtrFromAnchor(struct __tlsanchor *anchor, const void *);
 
template <typename T> class __Z_EXPORT __tlssim {
  struct __tlsanchor *anchor;
  T v;
 
public:
  __tlssim(const T &initvalue) : v(initvalue) {
    anchor = __tlsvaranchor_create(sizeof(T));
  }
  __tlssim() { anchor = __tlsvaranchor_create(sizeof(T)); }
  ~__tlssim() { __tlsvaranchor_destroy(anchor); }
  T *access(void) { return static_cast<T *>(__tlsPtrFromAnchor(anchor, &v)); }
};
 
#endif // __cplusplus
#endif // ZOS_TLS_H_