/usr/include/grpc/support/tls.h is in libgrpc-dev 0.11.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* Copyright 2015, Google Inc.
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#ifndef GRPC_SUPPORT_TLS_H
#define GRPC_SUPPORT_TLS_H
#include <grpc/support/port_platform.h>
/* Thread local storage.
A minimal wrapper that should be implementable across many compilers,
and implementable efficiently across most modern compilers.
Thread locals have type gpr_intptr.
Declaring a thread local variable 'foo':
GPR_TLS_DECL(foo);
Thread locals always have static scope.
Initializing a thread local (must be done at library initialization
time):
gpr_tls_init(&foo);
Destroying a thread local:
gpr_tls_destroy(&foo);
Setting a thread local (returns new_value):
gpr_tls_set(&foo, new_value);
Accessing a thread local:
current_value = gpr_tls_get(&foo, value);
ALL functions here may be implemented as macros. */
#ifdef GPR_GCC_TLS
#include <grpc/support/tls_gcc.h>
#endif
#ifdef GPR_MSVC_TLS
#include <grpc/support/tls_msvc.h>
#endif
#ifdef GPR_PTHREAD_TLS
#include <grpc/support/tls_pthread.h>
#endif
#endif
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